Pain

This reverts commit 9e92ea6062.

README.md

@@ -39,7 +39,7 @@ and many more.
 # For developers
 
 ## Javadoc
-The 6.13.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.13.0/javadoc/)
+The 6.27.2 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.27.2/javadoc/)
 
 ## Plugin Information
 
@@ -68,7 +68,7 @@ dependencies {
 }
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.13.0`.
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
 
 Maven:
 
@@ -88,7 +88,7 @@ Maven:
 </dependency>
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.13.0`.
+Replace `Tag` with a release tag for eco, eg `6.27.2`.
 
 ## Build locally:
 

build.gradle.kts

@@ -85,21 +85,25 @@ allprojects {
     }
 
     dependencies {
-        compileOnly(kotlin("stdlib", version = "1.6.10"))
+        // Included in spigot jar, no need to move to implementation
         compileOnly("org.jetbrains:annotations:23.0.0")
+        compileOnly("com.google.guava:guava:31.1-jre")
 
         // Test
         testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.2")
         testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.2")
-        
+
         // Adventure
-        compileOnly("net.kyori:adventure-api:4.10.0")
-        compileOnly("net.kyori:adventure-text-serializer-gson:4.10.0")
-        compileOnly("net.kyori:adventure-text-serializer-legacy:4.10.0")
+        implementation("net.kyori:adventure-api:4.10.1")
+        implementation("net.kyori:adventure-text-serializer-gson:4.10.1") {
+            exclude("com.google.code.gson", "gson") // Prevent shading into the jar
+        }
+        implementation("net.kyori:adventure-text-serializer-legacy:4.10.1")
 
         // Other
-        compileOnly("com.google.guava:guava:31.1-jre")
-        compileOnly("com.github.ben-manes.caffeine:caffeine:3.0.5")
+        implementation("com.github.ben-manes.caffeine:caffeine:3.0.6")
+        implementation("org.apache.maven:maven-artifact:3.8.4")
+        implementation(kotlin("stdlib", version = "1.6.10"))
     }
 
     tasks.withType<JavaCompile> {
@@ -115,10 +119,11 @@ allprojects {
         exclude(group = "com.darkblade12", module = "particleeffect")
         exclude(group = "com.github.cryptomorin", module = "XSeries")
         exclude(group = "net.wesjd", module = "anvilgui")
+        exclude(group = "org.slf4j", module = "slf4j-api")
     }
 
     configurations.testImplementation {
-        setExtendsFrom(listOf(configurations.compileOnly.get()))
+        setExtendsFrom(listOf(configurations.compileOnly.get(), configurations.implementation.get()))
     }
 
     tasks {
@@ -133,6 +138,28 @@ allprojects {
         shadowJar {
             relocate("org.bstats", "com.willfp.eco.libs.bstats")
             relocate("redempt.crunch", "com.willfp.eco.libs.crunch")
+            relocate("org.apache.commons.lang3", "com.willfp.eco.libs.lang3")
+            relocate("org.apache.maven", "com.willfp.eco.libs.maven")
+            relocate("org.checkerframework", "com.willfp.eco.libs.checkerframework")
+            relocate("org.intellij", "com.willfp.eco.libs.intellij")
+            relocate("org.jetbrains.annotations", "com.willfp.eco.libs.jetbrains.annotations")
+            //relocate("org.jetbrains.exposed", "com.willfp.eco.libs.exposed")
+            relocate("org.objenesis", "com.willfp.eco.libs.objenesis")
+            relocate("org.reflections", "com.willfp.eco.libs.reflections")
+            relocate("javassist", "com.willfp.eco.libs.javassist")
+            relocate("javax.annotation", "com.willfp.eco.libs.annotation")
+            relocate("com.google.errorprone", "com.willfp.eco.libs.errorprone")
+            relocate("com.google.j2objc", "com.willfp.eco.libs.j2objc")
+            relocate("com.google.thirdparty", "com.willfp.eco.libs.google.thirdparty")
+            relocate("com.google.protobuf", "com.willfp.eco.libs.google.protobuf") // No I don't know either
+            relocate("google.protobuf", "com.willfp.eco.libs.protobuf") // Still don't know
+            relocate("com.zaxxer.hikari", "com.willfp.eco.libs.hikari")
+            //relocate("com.mysql", "com.willfp.eco.libs.mysql")
+
+            /*
+            Kotlin and caffeine are not shaded so that they can be accessed directly by eco plugins.
+            Also, not relocating adventure, because it's a pain in the ass, and it doesn't *seem* to be causing loader constraint violations.
+             */
         }
 
         compileJava {

eco-api/build.gradle

@@ -4,7 +4,6 @@ dependencies {
 
     // Other
     compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
-    compileOnly 'org.apache.maven:maven-artifact:3.8.1'
     compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT'
     compileOnly 'com.google.code.gson:gson:2.8.8'
 }
@@ -12,6 +11,10 @@ dependencies {
 group 'com.willfp'
 version rootProject.version
 
+java {
+    withJavadocJar()
+}
+
 build.dependsOn publishToMavenLocal
 
 publishing {

eco-api/src/main/java/com/willfp/eco/core/EcoPlugin.java

@@ -353,9 +353,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
                 DefaultArtifactVersion mostRecentVersion = new DefaultArtifactVersion(version);
                 if (!(currentVersion.compareTo(mostRecentVersion) > 0 || currentVersion.equals(mostRecentVersion))) {
                     this.outdated = true;
-                    this.getLogger().warning("&c" + this.getName() + " is out of date! (Version " + this.getDescription().getVersion() + ")");
-                    this.getLogger().warning("&cThe newest version is &f" + version);
-                    this.getLogger().warning("&cDownload the new version!");
+                    this.getLogger().warning(this.getName() + " is out of date! (Version " + this.getDescription().getVersion() + ")");
+                    this.getLogger().warning("The newest version is " + version);
+                    this.getLogger().warning("Download the new version!");
                 }
             });
         }
@@ -489,9 +489,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final void reload() {
         this.getConfigHandler().updateConfigs();
 
+        this.getScheduler().cancelAll();
         this.getConfigHandler().callUpdate();
         this.getConfigHandler().callUpdate(); // Call twice to fix issues
-        this.getScheduler().cancelAll();
 
         this.handleReload();
 
@@ -694,7 +694,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final FileConfiguration getConfig() {
         this.getLogger().warning("Call to default config method in eco plugin!");
 
-        return Objects.requireNonNull(this.getConfigYml().getBukkitHandle());
+        return Objects.requireNonNull(this.getConfigYml().toBukkit());
     }
 
     /**

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -35,7 +35,7 @@ public class Prerequisite {
      *
      * @deprecated Use {@link EconomyManager#hasRegistrations()} instead.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     public static final Prerequisite HAS_VAULT = new Prerequisite(
             () -> ClassUtils.exists("net.milkbowl.vault.economy.Economy"),
             "Requires server to have vault"
@@ -54,7 +54,7 @@ public class Prerequisite {
      *
      * @deprecated eco no longer supports versions before 1.17.
      */
-    @Deprecated(since = "6.25.2")
+    @Deprecated(since = "6.25.2", forRemoval = true)
     public static final Prerequisite HAS_1_17 = new Prerequisite(
             () -> ProxyConstants.NMS_VERSION.contains("17") || HAS_1_18.isMet(),
             "Requires server to be running 1.17+"

eco-api/src/main/java/com/willfp/eco/core/command/CommandBase.java

@@ -10,6 +10,7 @@ import java.util.List;
 /**
  * Interface for all command implementations.
  */
+@SuppressWarnings("removal")
 public interface CommandBase {
     /**
      * Get command name.
@@ -81,7 +82,7 @@ public interface CommandBase {
      * @see CommandHandler
      * @deprecated Use {@link CommandBase#onExecute(CommandSender, List)} instead.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     CommandHandler getHandler();
 
     /**
@@ -91,7 +92,7 @@ public interface CommandBase {
      * @see CommandHandler
      * @deprecated Handlers have been deprecated.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     void setHandler(@NotNull CommandHandler handler);
 
     /**
@@ -101,7 +102,7 @@ public interface CommandBase {
      * @see TabCompleteHandler
      * @deprecated Use {@link CommandBase#tabComplete(CommandSender, List)} instead.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     TabCompleteHandler getTabCompleter();
 
     /**
@@ -111,6 +112,6 @@ public interface CommandBase {
      * @see TabCompleteHandler
      * @deprecated Handlers have been deprecated.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     void setTabCompleter(@NotNull TabCompleteHandler handler);
 }

eco-api/src/main/java/com/willfp/eco/core/command/CommandHandler.java

@@ -16,7 +16,7 @@ import java.util.List;
  * update to use the new system: {@link CommandBase#onExecute(CommandSender, List)}.
  */
 @FunctionalInterface
-@Deprecated(since = "6.17.0")
+@Deprecated(since = "6.17.0", forRemoval = true)
 public interface CommandHandler {
     /**
      * The code to be called on execution.

eco-api/src/main/java/com/willfp/eco/core/command/TabCompleteHandler.java

@@ -16,7 +16,7 @@ import java.util.List;
  * update to use the new system: {@link CommandBase#tabComplete(CommandSender, List)}
  */
 @FunctionalInterface
-@Deprecated(since = "6.17.0")
+@Deprecated(since = "6.17.0", forRemoval = true)
 public interface TabCompleteHandler {
     /**
      * Handle Tab Completion.

eco-api/src/main/java/com/willfp/eco/core/command/impl/HandledCommand.java

@@ -2,8 +2,6 @@ package com.willfp.eco.core.command.impl;
 
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.command.CommandBase;
-import com.willfp.eco.core.command.CommandHandler;
-import com.willfp.eco.core.command.TabCompleteHandler;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
@@ -23,7 +21,7 @@ import java.util.stream.Collectors;
  * in order to execute the command-specific code. It's essentially an internal
  * layer, hence why it's a package-private class.
  */
-@SuppressWarnings({"DeprecatedIsStillUsed"})
+@SuppressWarnings({"DeprecatedIsStillUsed", "removal"})
 abstract class HandledCommand implements CommandBase {
     /**
      * The plugin.
@@ -54,14 +52,14 @@ abstract class HandledCommand implements CommandBase {
      */
     @Deprecated
     @Nullable
-    private CommandHandler handler = null;
+    private com.willfp.eco.core.command.CommandHandler handler = null;
 
     /**
      * The tab completion code to be executed in the command.
      */
     @Deprecated
     @Nullable
-    private TabCompleteHandler tabCompleter = null;
+    private com.willfp.eco.core.command.TabCompleteHandler tabCompleter = null;
 
     /**
      * All subcommands for the command.
@@ -256,27 +254,27 @@ abstract class HandledCommand implements CommandBase {
         return this.subcommands;
     }
 
-    @Deprecated
+    @Deprecated(forRemoval = true)
     @Override
-    public @Nullable CommandHandler getHandler() {
+    public @Nullable com.willfp.eco.core.command.CommandHandler getHandler() {
         return this.handler;
     }
 
-    @Deprecated
+    @Deprecated(forRemoval = true)
     @Override
-    public @Nullable TabCompleteHandler getTabCompleter() {
+    public @Nullable com.willfp.eco.core.command.TabCompleteHandler getTabCompleter() {
         return this.tabCompleter;
     }
 
-    @Deprecated
+    @Deprecated(forRemoval = true)
     @Override
-    public void setHandler(@Nullable final CommandHandler handler) {
+    public void setHandler(@Nullable final com.willfp.eco.core.command.CommandHandler handler) {
         this.handler = handler;
     }
 
-    @Deprecated
+    @Deprecated(forRemoval = true)
     @Override
-    public void setTabCompleter(@Nullable final TabCompleteHandler tabCompleter) {
+    public void setTabCompleter(@Nullable final com.willfp.eco.core.command.TabCompleteHandler tabCompleter) {
         this.tabCompleter = tabCompleter;
     }
 }

eco-api/src/main/java/com/willfp/eco/core/config/BaseConfig.java

@@ -23,13 +23,31 @@ public abstract class BaseConfig extends LoadableConfigWrapper {
                          @NotNull final PluginLike plugin,
                          final boolean removeUnused,
                          @NotNull final ConfigType type) {
+        this(configName, plugin, removeUnused, type, true);
+    }
+
+    /**
+     * Create new Base Config.
+     *
+     * @param plugin               The plugin or extension.
+     * @param configName           The config name (excluding extension).
+     * @param removeUnused         If unused sections should be removed.
+     * @param type                 The config type.
+     * @param requiresChangeToSave If changes must be applied to save the config.
+     */
+    protected BaseConfig(@NotNull final String configName,
+                         @NotNull final PluginLike plugin,
+                         final boolean removeUnused,
+                         @NotNull final ConfigType type,
+                         final boolean requiresChangeToSave) {
         super(Eco.getHandler().getConfigFactory().createUpdatableConfig(
                 configName,
                 plugin,
                 "",
                 plugin.getClass(),
                 removeUnused,
-                type
+                type,
+                requiresChangeToSave
         ));
     }
 }

eco-api/src/main/java/com/willfp/eco/core/config/BuildableConfig.java

@@ -0,0 +1,29 @@
+package com.willfp.eco.core.config;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Builder for configs to create them programmatically.
+ */
+public class BuildableConfig extends TransientConfig {
+    /**
+     * Create a new empty config builder.
+     */
+    public BuildableConfig() {
+        super();
+    }
+
+    /**
+     * Add to the config builder.
+     *
+     * @param path   The path.
+     * @param object The object.
+     * @return The builder.
+     */
+    public BuildableConfig add(@NotNull final String path,
+                               @Nullable final Object object) {
+        set(path, object);
+        return this;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/config/ConfigType.java

@@ -1,5 +1,7 @@
 package com.willfp.eco.core.config;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * Config types, classified by file extension.
  */
@@ -7,10 +9,28 @@ public enum ConfigType {
     /**
      * .json config.
      */
-    JSON,
+    JSON("json"),
 
     /**
      * .yml config.
      */
-    YAML
+    YAML("yml");
+
+    /**
+     * The file extension.
+     */
+    private final String extension;
+
+    ConfigType(@NotNull final String extension) {
+        this.extension = extension;
+    }
+
+    /**
+     * Get the file extension.
+     *
+     * @return The extension.
+     */
+    public String getExtension() {
+        return extension;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/ExtendableConfig.java

@@ -38,6 +38,7 @@ public abstract class ExtendableConfig extends LoadableConfigWrapper {
                 source,
                 removeUnused,
                 type,
+                true,
                 updateBlacklist
         ));
     }

eco-api/src/main/java/com/willfp/eco/core/config/StaticBaseConfig.java

@@ -26,7 +26,8 @@ public abstract class StaticBaseConfig extends LoadableConfigWrapper {
                 plugin,
                 "",
                 plugin.getClass(),
-                type
+                type,
+                true
         ));
     }
 }

eco-api/src/main/java/com/willfp/eco/core/config/TransientConfig.java

@@ -3,12 +3,17 @@ package com.willfp.eco.core.config;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.config.interfaces.Config;
 import com.willfp.eco.core.config.wrapper.ConfigWrapper;
+import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.io.File;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.file.Files;
+import java.util.HashMap;
 import java.util.Map;
 
 /**
@@ -18,10 +23,19 @@ import java.util.Map;
  */
 public class TransientConfig extends ConfigWrapper<Config> {
     /**
+     * @param config The ConfigurationSection handle.
+     */
+    public TransientConfig(@NotNull final ConfigurationSection config) {
+        super(Eco.getHandler().getConfigFactory().createConfig(config));
+    }
+
+    /**
+     * Exists for backwards compatibility, YamlConfigurations are ConfigurationSections.
+     *
      * @param config The YamlConfiguration handle.
      */
     public TransientConfig(@NotNull final YamlConfiguration config) {
-        super(Eco.getHandler().getConfigFactory().createConfig(config));
+        this((ConfigurationSection) config);
     }
 
     /**
@@ -33,20 +47,50 @@ public class TransientConfig extends ConfigWrapper<Config> {
         )) : new TransientConfig());
     }
 
+    /**
+     * @param file The File.
+     * @deprecated Specify the config type to prevent bugs.
+     */
+    @Deprecated(since = "6.30.0", forRemoval = true)
+    public TransientConfig(@Nullable final File file) {
+        this(file, ConfigType.YAML);
+    }
+
+    /**
+     * @param file The file.
+     * @param type The config type to try read from.
+     */
+    public TransientConfig(@Nullable final File file,
+                           @NotNull final ConfigType type) {
+        super(file != null ? Eco.getHandler().getConfigFactory().createConfig(readFile(file), type)
+                : new TransientConfig());
+    }
+
     /**
      * Create a new empty transient config.
      *
      * @param values The values.
      */
     public TransientConfig(@NotNull final Map<String, Object> values) {
-        super(Eco.getHandler().getConfigFactory().createConfig(values));
+        super(Eco.getHandler().getConfigFactory().createConfig(values, ConfigType.YAML));
+    }
+
+    /**
+     * Create a new empty transient config.
+     *
+     * @param values The values.
+     * @param type   The type.
+     */
+    public TransientConfig(@NotNull final Map<String, Object> values,
+                           @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createConfig(values, type));
     }
 
     /**
      * Create a new empty transient config.
      */
     public TransientConfig() {
-        super(Eco.getHandler().getConfigFactory().createConfig("", ConfigType.YAML));
+        this(new HashMap<>(), ConfigType.JSON);
     }
 
     /**
@@ -57,4 +101,22 @@ public class TransientConfig extends ConfigWrapper<Config> {
                            @NotNull final ConfigType type) {
         super(Eco.getHandler().getConfigFactory().createConfig(contents, type));
     }
+
+    /**
+     * Read a file to a string.
+     *
+     * @param file The file.
+     * @return The string.
+     */
+    private static String readFile(@Nullable final File file) {
+        if (file == null) {
+            return "";
+        }
+
+        try {
+            return Files.readString(file.toPath());
+        } catch (IOException e) {
+            return "";
+        }
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/Config.java

@@ -1,16 +1,25 @@
 package com.willfp.eco.core.config.interfaces;
 
+import com.willfp.eco.core.config.BuildableConfig;
 import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.TransientConfig;
+import com.willfp.eco.core.placeholder.PlaceholderInjectable;
+import com.willfp.eco.core.placeholder.StaticPlaceholder;
 import com.willfp.eco.util.NumberUtils;
 import com.willfp.eco.util.StringUtils;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 
 /**
  * All configs implement this interface.
@@ -18,11 +27,16 @@ import java.util.Objects;
  * Contains all methods that must exist in yaml and json configurations.
  */
 @SuppressWarnings("unused")
-public interface Config extends Cloneable {
+public interface Config extends Cloneable, PlaceholderInjectable {
     /**
      * Clears cache.
+     * <p>
+     * Configs no longer have caches as they have in previous versions.
      */
-    void clearCache();
+    @Deprecated(since = "6.31.1", forRemoval = true)
+    default void clearCache() {
+        // Do nothing.
+    }
 
     /**
      * Convert the config into readable text.
@@ -48,6 +62,19 @@ public interface Config extends Cloneable {
     @NotNull
     List<String> getKeys(boolean deep);
 
+    /**
+     * Recurse config keys.
+     *
+     * @param found The found keys.
+     * @param root  The root.
+     * @return The keys.
+     */
+    @NotNull
+    default List<String> recurseKeys(@NotNull Set<String> found,
+                                     @NotNull String root) {
+        return new ArrayList<>();
+    }
+
     /**
      * Get an object from config.
      * Default implementations call {@link org.bukkit.configuration.file.YamlConfiguration#get(String)}.
@@ -238,35 +265,6 @@ public interface Config extends Cloneable {
         return getString(path, false, StringUtils.FormatOption.WITHOUT_PLACEHOLDERS);
     }
 
-    /**
-     * Get a string from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the string should be formatted.
-     * @return The found value, or an empty string if not found.
-     * @deprecated Since 6.18.0, {@link Config#getString(String)} is not formatted by default.
-     */
-    @Deprecated(since = "6.18.0")
-    default String getString(@NotNull String path,
-                             boolean format) {
-        return this.getString(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a string from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or an empty string if not found.
-     * @deprecated Use {@link Config#getFormattedString(String, StringUtils.FormatOption)} instead.
-     */
-    @NotNull
-    @Deprecated
-    default String getString(@NotNull String path,
-                             @NotNull final StringUtils.FormatOption option) {
-        return this.getString(path, true, option);
-    }
-
     /**
      * Get a string from config.
      *
@@ -319,36 +317,6 @@ public interface Config extends Cloneable {
         return getStringOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
-    /**
-     * Get a string from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the string should be formatted.
-     * @return The found value, or null if not found.
-     * @deprecated Since 6.18.0, {@link Config#getString(String)} is not formatted by default.
-     */
-    @Nullable
-    @Deprecated(since = "6.18.0")
-    default String getStringOrNull(@NotNull String path,
-                                   boolean format) {
-        return this.getStringOrNull(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a string from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or null if not found.
-     * @deprecated Use {@link Config#getFormattedString(String, StringUtils.FormatOption)} instead.
-     */
-    @Nullable
-    @Deprecated
-    default String getStringOrNull(@NotNull String path,
-                                   @NotNull StringUtils.FormatOption option) {
-        return this.getStringOrNull(path, true, option);
-    }
-
     /**
      * Get a string from config.
      *
@@ -403,36 +371,6 @@ public interface Config extends Cloneable {
         return getStrings(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the strings should be formatted.
-     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
-     * @deprecated Since 6.18.0, {@link Config#getString(String)} is not formatted by default.
-     */
-    @NotNull
-    @Deprecated(since = "6.18.0")
-    default List<String> getStrings(@NotNull String path,
-                                    boolean format) {
-        return this.getStrings(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
-     * @deprecated Use {@link Config#getFormattedStrings(String, StringUtils.FormatOption)} instead.
-     */
-    @NotNull
-    @Deprecated
-    default List<String> getStrings(@NotNull String path,
-                                    @NotNull StringUtils.FormatOption option) {
-        return getStrings(path, false, option);
-    }
-
     /**
      * Get a list of strings from config.
      *
@@ -491,36 +429,6 @@ public interface Config extends Cloneable {
         return getStringsOrNull(path, false, StringUtils.FormatOption.WITH_PLACEHOLDERS);
     }
 
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param format If the strings should be formatted.
-     * @return The found value, or null if not found.
-     * @deprecated Since 6.18.0, {@link Config#getString(String)} is not formatted by default.
-     */
-    @Nullable
-    @Deprecated(since = "6.18.0")
-    default List<String> getStringsOrNull(@NotNull String path,
-                                          boolean format) {
-        return getStringsOrNull(path, format, StringUtils.FormatOption.WITH_PLACEHOLDERS);
-    }
-
-    /**
-     * Get a list of strings from config.
-     *
-     * @param path   The key to fetch the value from.
-     * @param option The format option.
-     * @return The found value, or null if not found.
-     * @deprecated Use {@link Config#getFormattedStringsOrNull(String, StringUtils.FormatOption)} instead.
-     */
-    @Nullable
-    @Deprecated
-    default List<String> getStringsOrNull(@NotNull String path,
-                                          @NotNull StringUtils.FormatOption option) {
-        return getStringsOrNull(path, false, option);
-    }
-
     /**
      * Get a list of strings from config.
      *
@@ -563,7 +471,7 @@ public interface Config extends Cloneable {
      */
     default double getDoubleFromExpression(@NotNull String path,
                                            @Nullable Player player) {
-        return NumberUtils.evaluateExpression(this.getString(path), player);
+        return NumberUtils.evaluateExpression(this.getString(path), player, this.getInjectedPlaceholders());
     }
 
     /**
@@ -629,4 +537,48 @@ public interface Config extends Cloneable {
      * @return The clone.
      */
     Config clone();
+
+    @Override
+    default void injectPlaceholders(@NotNull Iterable<StaticPlaceholder> placeholders) {
+        // Do nothing.
+    }
+
+    @Override
+    default List<StaticPlaceholder> getInjectedPlaceholders() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    default void clearInjectedPlaceholders() {
+        // Do nothing.
+    }
+
+    /**
+     * Convert the config to a map of values.
+     *
+     * @return The values.
+     */
+    default Map<String, Object> toMap() {
+        return new HashMap<>();
+    }
+
+    /**
+     * Convert the config to a map of values.
+     *
+     * @return The values.
+     */
+    default ConfigurationSection toBukkit() {
+        YamlConfiguration empty = new YamlConfiguration();
+        empty.createSection("temp", this.toMap());
+        return empty.getConfigurationSection("temp");
+    }
+
+    /**
+     * Create a new config builder.
+     *
+     * @return The builder.
+     */
+    static BuildableConfig builder() {
+        return new BuildableConfig();
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/JSONConfig.java

@@ -1,63 +0,0 @@
-package com.willfp.eco.core.config.interfaces;
-
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Objects;
-
-/**
- * JSON config.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-@SuppressWarnings("DeprecatedIsStillUsed")
-public interface JSONConfig extends Config {
-    /**
-     * Get a list of subsections from config.
-     *
-     * @param path The key to fetch the value from.
-     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
-     */
-    @NotNull
-    default List<JSONConfig> getSubsections(@NotNull String path) {
-        return Objects.requireNonNullElse(getSubsectionsOrNull(path), new ArrayList<>());
-    }
-
-    /**
-     * Get a list of subsections from config.
-     *
-     * @param path The key to fetch the value from.
-     * @return The found value, or null if not found.
-     */
-    @Nullable
-    List<JSONConfig> getSubsectionsOrNull(@NotNull String path);
-
-
-    /**
-     * Get subsection from config.
-     *
-     * @param path The key to check.
-     * @return The subsection. Throws NPE if not found.
-     */
-    @Override
-    @NotNull
-    JSONConfig getSubsection(@NotNull String path);
-
-    /**
-     * Get subsection from config.
-     *
-     * @param path The key to check.
-     * @return The subsection, or null if not found.
-     */
-    @Override
-    @Nullable
-    JSONConfig getSubsectionOrNull(@NotNull String path);
-
-    @Override
-    JSONConfig clone();
-}

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/LoadableConfig.java

@@ -1,7 +1,7 @@
 package com.willfp.eco.core.config.interfaces;
 
 import org.bukkit.configuration.file.YamlConfiguration;
-import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
@@ -47,14 +47,21 @@ public interface LoadableConfig extends Config {
     /**
      * Get bukkit {@link YamlConfiguration}.
      * <p>
-     * This method is not recommended unless absolutely required as it
-     * only returns true if the type of config is {@link com.willfp.eco.core.config.ConfigType#YAML},
-     * and if the handle is an {@link YamlConfiguration} specifically. This depends on the internals
-     * and the implementation, and so may cause problems - it exists mostly for parity with
-     * {@link JavaPlugin#getConfig()}.
+     * This used to represent the underlying config, but since 6.30.0 configs use
+     * their own implementations internally, without relying on bukkit.
      *
      * @return The config, or null if config is not yaml-based.
+     * @deprecated Use toBukkit() instead.
      */
     @Nullable
-    YamlConfiguration getBukkitHandle();
+    @Deprecated(since = "6.30.0", forRemoval = true)
+    default YamlConfiguration getBukkitHandle() {
+        return this.toBukkit();
+    }
+
+    /**
+     * Convert the config to a bukkit {@link YamlConfiguration}.
+     */
+    @NotNull
+    YamlConfiguration toBukkit();
 }

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/WrappedYamlConfiguration.java

@@ -1,21 +0,0 @@
-package com.willfp.eco.core.config.interfaces;
-
-import org.bukkit.configuration.file.YamlConfiguration;
-
-/**
- * Interface for configs that wrap an {@link YamlConfiguration}.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-@SuppressWarnings("DeprecatedIsStillUsed")
-public interface WrappedYamlConfiguration {
-    /**
-     * Get the ConfigurationSection handle.
-     *
-     * @return The handle.
-     */
-    YamlConfiguration getBukkitHandle();
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONBaseConfig.java

@@ -1,90 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in the plugin's base directory (eg config.json).
- * <p>
- * Automatically updates.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
-    /**
-     * @param configName      The name of the config
-     * @param removeUnused    Whether keys not present in the default config should be removed on update.
-     * @param plugin          The plugin.
-     * @param updateBlacklist Substring of keys to not add/remove keys for.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin,
-                             @NotNull final String... updateBlacklist) {
-        super(
-                (JSONConfig)
-                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                                configName,
-                                plugin,
-                                "",
-                                plugin.getClass(),
-                                removeUnused,
-                                ConfigType.JSON,
-                                updateBlacklist
-                        )
-        );
-    }
-
-    /**
-     * @param configName   The name of the config
-     * @param removeUnused Whether keys not present in the default config should be removed on update.
-     * @param plugin       The plugin.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin) {
-        super(
-                (JSONConfig)
-                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                                configName,
-                                plugin,
-                                "",
-                                plugin.getClass(),
-                                removeUnused,
-                                ConfigType.JSON
-                        )
-        );
-    }
-
-    /**
-     * @param configName      The name of the config
-     * @param removeUnused    Whether keys not present in the default config should be removed on update.
-     * @param plugin          The plugin.
-     * @param updateBlacklist Substring of keys to not add/remove keys for.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin,
-                             @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
-    }
-
-    /**
-     * @param configName   The name of the config
-     * @param removeUnused Whether keys not present in the default config should be removed on update.
-     * @param plugin       The plugin.
-     */
-    protected JSONBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin) {
-        this(configName, removeUnused, (PluginLike) plugin);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONExtendableConfig.java

@@ -1,70 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in one of two places:
- * <ul>
- *     <li>Plugin base directory (eg config.yml, lang.yml)</li>
- *     <li>Other extension's configs</li>
- * </ul>
- * <p>
- * Automatically updates.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class JSONExtendableConfig extends LoadableJSONConfigWrapper {
-    /**
-     * @param configName       The name of the config
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param plugin           The plugin.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     */
-    protected JSONExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final PluginLike plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        super(
-                (JSONConfig)
-                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                                configName,
-                                plugin,
-                                subDirectoryPath,
-                                source,
-                                removeUnused,
-                                ConfigType.JSON,
-                                updateBlacklist
-                        )
-        );
-    }
-
-    /**
-     * @param configName       The name of the config
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param plugin           The plugin.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     */
-    protected JSONExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final EcoPlugin plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONStaticBaseConfig.java

@@ -1,45 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Non-updatable JSON config that exists within a plugin jar.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class JSONStaticBaseConfig extends LoadableJSONConfigWrapper {
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected JSONStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final PluginLike plugin) {
-        super((JSONConfig) Eco.getHandler().getConfigFactory().createLoadableConfig(configName, plugin, "", plugin.getClass(), ConfigType.JSON));
-    }
-
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected JSONStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
-        this(configName, (PluginLike) plugin);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/JSONTransientConfig.java

@@ -1,37 +0,0 @@
-package com.willfp.eco.core.config.json;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.json.wrapper.JSONConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * Raw JSON config with a map of values at its core.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public class JSONTransientConfig extends JSONConfigWrapper {
-    /**
-     * Config implementation for passing maps.
-     * <p>
-     * Does not automatically update.
-     *
-     * @param values The map of values.
-     */
-    public JSONTransientConfig(@NotNull final Map<String, Object> values) {
-        super((JSONConfig) Eco.getHandler().getConfigFactory().createConfig(values));
-    }
-
-    /**
-     * Empty JSON config.
-     */
-    public JSONTransientConfig() {
-        super((JSONConfig) Eco.getHandler().getConfigFactory().createConfig(new HashMap<>()));
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/wrapper/JSONConfigWrapper.java

@@ -1,53 +0,0 @@
-package com.willfp.eco.core.config.json.wrapper;
-
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.wrapper.ConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-
-/**
- * Wrapper to handle the backend JSON config implementations.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class JSONConfigWrapper extends ConfigWrapper<JSONConfig> implements JSONConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected JSONConfigWrapper(@NotNull final JSONConfig handle) {
-        super(handle);
-    }
-
-
-    @Override
-    public @NotNull List<JSONConfig> getSubsections(@NotNull final String path) {
-        return this.getHandle().getSubsections(path);
-    }
-
-    @Override
-    public @Nullable List<JSONConfig> getSubsectionsOrNull(@NotNull final String path) {
-        return this.getHandle().getSubsectionsOrNull(path);
-    }
-
-    @Override
-    public @NotNull JSONConfig getSubsection(@NotNull final String path) {
-        return this.getHandle().getSubsection(path);
-    }
-
-    @Override
-    public @Nullable JSONConfig getSubsectionOrNull(@NotNull final String path) {
-        return this.getHandle().getSubsectionOrNull(path);
-    }
-
-    @Override
-    public JSONConfig clone() {
-        return this.getHandle().clone();
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/json/wrapper/LoadableJSONConfigWrapper.java

@@ -1,63 +0,0 @@
-package com.willfp.eco.core.config.json.wrapper;
-
-import com.willfp.eco.core.config.interfaces.JSONConfig;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import org.apache.commons.lang.Validate;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.File;
-import java.io.IOException;
-
-/**
- * Wrapper to handle the backend loadable JSON config implementations.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class LoadableJSONConfigWrapper extends JSONConfigWrapper implements LoadableConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected LoadableJSONConfigWrapper(@NotNull final JSONConfig handle) {
-        super(handle);
-
-        Validate.isTrue(handle instanceof LoadableConfig, "Wrapped config must be loadable!");
-    }
-
-
-    @Override
-    public void createFile() {
-        ((LoadableConfig) this.getHandle()).createFile();
-    }
-
-    @Override
-    public String getResourcePath() {
-        return ((LoadableConfig) this.getHandle()).getResourcePath();
-    }
-
-    @Override
-    public void save() throws IOException {
-        ((LoadableConfig) this.getHandle()).save();
-    }
-
-    @Override
-    public File getConfigFile() {
-        return ((LoadableConfig) this.getHandle()).getConfigFile();
-    }
-
-    @Override
-    public String getName() {
-        return ((LoadableConfig) this.getHandle()).getName();
-    }
-
-    @Override
-    public @Nullable YamlConfiguration getBukkitHandle() {
-        return null;
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/updating/ConfigUpdater.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.config.updating;
 
+import java.lang.annotation.Documented;
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -29,7 +30,8 @@ import java.lang.annotation.Target;
  * }</pre>
  * <p>
  * If using kotlin, you have to annotate the method with {@code @JvmStatic}
- * in order to prevent null pointer exceptions.
+ * in order to prevent null pointer exceptions - this also means that you cannot
+ * have config updater methods in companion objects.
  * <p>
  * Config update methods in all classes in a plugin jar will be called
  * on reload.
@@ -39,5 +41,6 @@ import java.lang.annotation.Target;
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)
+@Documented
 public @interface ConfigUpdater {
 }

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigFactory.java

@@ -5,7 +5,7 @@ import com.willfp.eco.core.PluginLike;
 import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.interfaces.Config;
 import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.configuration.ConfigurationSection;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
@@ -20,13 +20,14 @@ public interface ConfigFactory {
     /**
      * Updatable config.
      *
-     * @param configName       The name of the config
-     * @param plugin           The plugin.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param type             The config type.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param configName            The name of the config
+     * @param plugin                The plugin.
+     * @param subDirectoryPath      The subdirectory path.
+     * @param source                The class that owns the resource.
+     * @param removeUnused          Whether keys not present in the default config should be removed on update.
+     * @param type                  The config type.
+     * @param updateBlacklist       Substring of keys to not add/remove keys for.
+     * @param requiresChangesToSave If the config must be changed in order to save the config.
      * @return The config implementation.
      */
     LoadableConfig createUpdatableConfig(@NotNull String configName,
@@ -35,23 +36,26 @@ public interface ConfigFactory {
                                          @NotNull Class<?> source,
                                          boolean removeUnused,
                                          @NotNull ConfigType type,
+                                         boolean requiresChangesToSave,
                                          @NotNull String... updateBlacklist);
 
     /**
      * Loadable config.
      *
-     * @param configName       The name of the config
-     * @param plugin           The plugin.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     * @param type             The config type.
+     * @param configName            The name of the config
+     * @param plugin                The plugin.
+     * @param subDirectoryPath      The subdirectory path.
+     * @param source                The class that owns the resource.
+     * @param type                  The config type.
+     * @param requiresChangesToSave If the config must be changed in order to save the config.
      * @return The config implementation.
      */
     LoadableConfig createLoadableConfig(@NotNull String configName,
                                         @NotNull PluginLike plugin,
                                         @NotNull String subDirectoryPath,
                                         @NotNull Class<?> source,
-                                        @NotNull ConfigType type);
+                                        @NotNull ConfigType type,
+                                        boolean requiresChangesToSave);
 
     /**
      * Create config.
@@ -59,15 +63,17 @@ public interface ConfigFactory {
      * @param config The handle.
      * @return The config implementation.
      */
-    Config createConfig(@NotNull YamlConfiguration config);
+    Config createConfig(@NotNull ConfigurationSection config);
 
     /**
      * Create config.
      *
      * @param values The values.
+     * @param type   The config type.
      * @return The config implementation.
      */
-    Config createConfig(@NotNull Map<String, Object> values);
+    Config createConfig(@NotNull Map<String, Object> values,
+                        @NotNull ConfigType type);
 
     /**
      * Create config.

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigWrapper.java

@@ -2,11 +2,14 @@ package com.willfp.eco.core.config.wrapper;
 
 import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.placeholder.StaticPlaceholder;
 import com.willfp.eco.util.StringUtils;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 /**
  * Configs from eco have an internal implementation,
@@ -16,7 +19,7 @@ import java.util.List;
  *
  * @param <T> The type of the handle.
  */
-@SuppressWarnings("MethodDoesntCallSuperMethod")
+@SuppressWarnings({"MethodDoesntCallSuperMethod", "removal"})
 public abstract class ConfigWrapper<T extends Config> implements Config {
     /**
      * Configs from eco have an internal implementation,
@@ -40,6 +43,7 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
     }
 
     @Override
+    @Deprecated(since = "6.31.1", forRemoval = true)
     public void clearCache() {
         handle.clearCache();
     }
@@ -59,6 +63,12 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         return handle.getKeys(deep);
     }
 
+    @Override
+    public @NotNull List<String> recurseKeys(@NotNull final Set<String> found,
+                                             @NotNull final String root) {
+        return handle.recurseKeys(found, root);
+    }
+
     @Override
     public @Nullable Object get(@NotNull final String path) {
         return handle.get(path);
@@ -134,6 +144,31 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         return handle.getType();
     }
 
+    @Override
+    public void injectPlaceholders(@NotNull final StaticPlaceholder... placeholders) {
+        handle.injectPlaceholders(placeholders);
+    }
+
+    @Override
+    public void injectPlaceholders(@NotNull final Iterable<StaticPlaceholder> placeholders) {
+        handle.injectPlaceholders(placeholders);
+    }
+
+    @Override
+    public List<StaticPlaceholder> getInjectedPlaceholders() {
+        return handle.getInjectedPlaceholders();
+    }
+
+    @Override
+    public void clearInjectedPlaceholders() {
+        handle.clearInjectedPlaceholders();
+    }
+
+    @Override
+    public Map<String, Object> toMap() {
+        return this.handle.toMap();
+    }
+
     /**
      * Get the handle.
      *

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/LoadableConfigWrapper.java

@@ -3,7 +3,6 @@ package com.willfp.eco.core.config.wrapper;
 import com.willfp.eco.core.config.interfaces.LoadableConfig;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
 import java.io.IOException;
@@ -47,7 +46,7 @@ public abstract class LoadableConfigWrapper extends ConfigWrapper<LoadableConfig
     }
 
     @Override
-    public @Nullable YamlConfiguration getBukkitHandle() {
-        return this.getHandle().getBukkitHandle();
+    public @NotNull YamlConfiguration toBukkit() {
+        return this.getHandle().toBukkit();
     }
 }

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlBaseConfig.java

@@ -1,87 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
- * <p>
- * Automatically updates.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
-    /**
-     * @param configName      The name of the config
-     * @param removeUnused    Whether keys not present in the default config should be removed on update.
-     * @param plugin          The plugin.
-     * @param updateBlacklist Substring of keys to not add/remove keys for.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin,
-                             @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused,
-                        ConfigType.YAML,
-                        updateBlacklist
-                )
-        );
-    }
-
-    /**
-     * @param configName   The name of the config
-     * @param removeUnused Whether keys not present in the default config should be removed on update.
-     * @param plugin       The plugin.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final PluginLike plugin) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused,
-                        ConfigType.YAML
-                )
-        );
-    }
-
-    /**
-     * @param configName      The name of the config
-     * @param removeUnused    Whether keys not present in the default config should be removed on update.
-     * @param plugin          The plugin.
-     * @param updateBlacklist Substring of keys to not add/remove keys for.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin,
-                             @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, updateBlacklist);
-    }
-
-    /**
-     * @param configName   The name of the config
-     * @param removeUnused Whether keys not present in the default config should be removed on update.
-     * @param plugin       The plugin.
-     */
-    protected YamlBaseConfig(@NotNull final String configName,
-                             final boolean removeUnused,
-                             @NotNull final EcoPlugin plugin) {
-        this(configName, removeUnused, (PluginLike) plugin);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlExtendableConfig.java

@@ -1,68 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Config implementation for configs present in one of two places:
- * <ul>
- *     <li>Plugin base directory (eg config.yml, lang.yml)</li>
- *     <li>Other extension's configs</li>
- * </ul>
- * <p>
- * Automatically updates.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
-    /**
-     * @param configName       The name of the config
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param plugin           The plugin.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     */
-    protected YamlExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final PluginLike plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        super(
-                Eco.getHandler().getConfigFactory().createUpdatableConfig(
-                        configName,
-                        plugin,
-                        subDirectoryPath,
-                        source,
-                        removeUnused,
-                        ConfigType.YAML,
-                        updateBlacklist
-                )
-        );
-    }
-
-    /**
-     * @param configName       The name of the config
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param plugin           The plugin.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     */
-    protected YamlExtendableConfig(@NotNull final String configName,
-                                   final boolean removeUnused,
-                                   @NotNull final EcoPlugin plugin,
-                                   @NotNull final Class<?> source,
-                                   @NotNull final String subDirectoryPath,
-                                   @NotNull final String... updateBlacklist) {
-        this(configName, removeUnused, (PluginLike) plugin, source, subDirectoryPath, updateBlacklist);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlStaticBaseConfig.java

@@ -1,44 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.PluginLike;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Non-updatable yaml config that exists within a plugin jar.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class YamlStaticBaseConfig extends LoadableYamlConfigWrapper {
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected YamlStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final PluginLike plugin) {
-        super(Eco.getHandler().getConfigFactory().createLoadableConfig(configName, plugin, "", plugin.getClass(), ConfigType.YAML));
-    }
-
-    /**
-     * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
-     * <p>
-     * Does not automatically update.
-     *
-     * @param configName The name of the config
-     * @param plugin     The plugin.
-     */
-    protected YamlStaticBaseConfig(@NotNull final String configName,
-                                   @NotNull final EcoPlugin plugin) {
-        this(configName, (PluginLike) plugin);
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/yaml/YamlTransientConfig.java

@@ -1,42 +0,0 @@
-package com.willfp.eco.core.config.yaml;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.config.ConfigType;
-import com.willfp.eco.core.config.yaml.wrapper.YamlConfigWrapper;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-import java.io.StringReader;
-
-/**
- * Config implementation for passing YamlConfigurations.
- * <p>
- * Does not automatically update.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public class YamlTransientConfig extends YamlConfigWrapper {
-    /**
-     * @param config The YamlConfiguration handle.
-     */
-    public YamlTransientConfig(@NotNull final YamlConfiguration config) {
-        super(Eco.getHandler().getConfigFactory().createConfig(config));
-    }
-
-    /**
-     * @param contents The contents of the config.
-     */
-    public YamlTransientConfig(@NotNull final String contents) {
-        super(Eco.getHandler().getConfigFactory().createConfig(contents, ConfigType.YAML));
-    }
-
-    /**
-     * Create a new empty transient config.
-     */
-    public YamlTransientConfig() {
-        super(Eco.getHandler().getConfigFactory().createConfig(YamlConfiguration.loadConfiguration(new StringReader(""))));
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/yaml/wrapper/LoadableYamlConfigWrapper.java

@@ -1,63 +0,0 @@
-package com.willfp.eco.core.config.yaml.wrapper;
-
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.LoadableConfig;
-import org.apache.commons.lang.Validate;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.File;
-import java.io.IOException;
-
-/**
- * Wrapper to handle the backend loadable yaml config implementations.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class LoadableYamlConfigWrapper extends YamlConfigWrapper implements LoadableConfig {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected LoadableYamlConfigWrapper(@NotNull final Config handle) {
-        super(handle);
-
-        Validate.isTrue(handle instanceof LoadableConfig, "Wrapped config must be loadable!");
-    }
-
-
-    @Override
-    public void createFile() {
-        ((LoadableConfig) this.getHandle()).createFile();
-    }
-
-    @Override
-    public String getResourcePath() {
-        return ((LoadableConfig) this.getHandle()).getResourcePath();
-    }
-
-    @Override
-    public void save() throws IOException {
-        ((LoadableConfig) this.getHandle()).save();
-    }
-
-    @Override
-    public File getConfigFile() {
-        return ((LoadableConfig) this.getHandle()).getConfigFile();
-    }
-
-    @Override
-    public String getName() {
-        return ((LoadableConfig) this.getHandle()).getName();
-    }
-
-    @Override
-    public @Nullable YamlConfiguration getBukkitHandle() {
-        return ((LoadableConfig) this.getHandle()).getBukkitHandle();
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/config/yaml/wrapper/YamlConfigWrapper.java

@@ -1,31 +0,0 @@
-package com.willfp.eco.core.config.yaml.wrapper;
-
-import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration;
-import com.willfp.eco.core.config.wrapper.ConfigWrapper;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Wrapper to handle the backend yaml config implementations.
- *
- * @deprecated JSON and yml have full parity, use configs without a prefix instead,
- * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
- * These configs will be removed eventually.
- */
-@Deprecated(since = "6.17.0")
-public abstract class YamlConfigWrapper extends ConfigWrapper<Config> implements WrappedYamlConfiguration {
-    /**
-     * Create a config wrapper.
-     *
-     * @param handle The handle.
-     */
-    protected YamlConfigWrapper(@NotNull final Config handle) {
-        super(handle);
-    }
-
-    @Override
-    public YamlConfiguration getBukkitHandle() {
-        return ((WrappedYamlConfiguration) this.getHandle()).getBukkitHandle();
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKeyType.java

@@ -5,6 +5,7 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * All storable data key types.
@@ -79,6 +80,22 @@ public final class PersistentDataKeyType<T> {
         this.name = name;
     }
 
+    @Override
+    public boolean equals(@Nullable final Object that) {
+        if (this == that) {
+            return true;
+        }
+        if (!(that instanceof PersistentDataKeyType type)) {
+            return false;
+        }
+        return Objects.equals(this.name, type.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.name);
+    }
+
     /**
      * Get all registered {@link PersistentDataKeyType}s.
      *

eco-api/src/main/java/com/willfp/eco/core/entities/ai/CustomGoal.java

@@ -40,9 +40,9 @@ public abstract class CustomGoal<T extends Mob> implements EntityGoal<T>, Target
     /**
      * Tick the goal.
      * <p>
-     * Runs ever tick as long as {@link this#canUse()} returns true.
+     * Runs ever tick as long as canUse returns true.
      * <p>
-     * Runs after {@link this#start()}.
+     * Runs after start().
      */
     public void tick() {
         // Override when needed.
@@ -51,7 +51,7 @@ public abstract class CustomGoal<T extends Mob> implements EntityGoal<T>, Target
     /**
      * Start the goal.
      * <p>
-     * Runs once {@link this#canUse()} returns true.
+     * Runs once canUse() returns true.
      */
     public void start() {
         // Override when needed.
@@ -60,7 +60,7 @@ public abstract class CustomGoal<T extends Mob> implements EntityGoal<T>, Target
     /**
      * Stop the goal.
      * <p>
-     * Runs once {@link this#canUse()} returns false.
+     * Runs once canUse() returns false.
      */
     public void stop() {
         // Override when needed.

eco-api/src/main/java/com/willfp/eco/core/fast/FastItemStack.java

@@ -24,7 +24,7 @@ public interface FastItemStack {
      * @return A map of all enchantments.
      * @deprecated Poorly named method. Use getEnchants instead.
      */
-    @Deprecated(since = "6.24.0")
+    @Deprecated(since = "6.24.0", forRemoval = true)
     default Map<Enchantment, Integer> getEnchantmentsOnItem(boolean checkStored) {
         return getEnchants(checkStored);
     }

eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java

@@ -96,6 +96,13 @@ public interface Menu {
      */
     Set<NamespacedKey> getKeys(@NotNull Player player);
 
+    /**
+     * Re-render the menu for a player.
+     *
+     * @param player The player.
+     */
+    void refresh(@NotNull Player player);
+
     /**
      * Create a builder with a given amount of rows.
      *

eco-api/src/main/java/com/willfp/eco/core/integrations/customitems/CustomItemsManager.java

@@ -34,6 +34,17 @@ public final class CustomItemsManager {
         }
     }
 
+    /**
+     * Register all the custom items for a specific plugin into eco.
+     *
+     * @see com.willfp.eco.core.items.Items
+     */
+    public static void registerProviders() {
+        for (CustomItemsWrapper customItemsWrapper : REGISTERED) {
+            customItemsWrapper.registerProvider();
+        }
+    }
+
     private CustomItemsManager() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/core/integrations/customitems/CustomItemsWrapper.java

@@ -11,5 +11,14 @@ public interface CustomItemsWrapper extends Integration {
      *
      * @see com.willfp.eco.core.items.Items
      */
-    void registerAllItems();
+    default void registerAllItems() {
+        // Override when needed.
+    }
+
+    /**
+     * Register {@link com.willfp.eco.core.items.provider.ItemProvider}s.
+     */
+    default void registerProvider() {
+        // Override when needed.
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderEntry.java

@@ -1,6 +1,10 @@
 package com.willfp.eco.core.integrations.placeholder;
 
+import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.placeholder.Placeholder;
+import com.willfp.eco.core.placeholder.PlayerPlaceholder;
+import com.willfp.eco.core.placeholder.PlayerlessPlaceholder;
 import org.apache.commons.lang.Validate;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
@@ -10,10 +14,13 @@ import java.util.Objects;
 import java.util.function.Function;
 
 /**
- * A {@link PlaceholderEntry} is a placeholder in and of itself.
+ * A placeholder entry is a placeholder in and of itself.
  * <p>
  * It should be fairly straightforward.
+ *
+ * @deprecated Confusing functionality with inconsistent nullability and poor naming.
  */
+@Deprecated(since = "6.28.0", forRemoval = true)
 public class PlaceholderEntry {
     /**
      * The name of the placeholder, used in lookups.
@@ -140,7 +147,28 @@ public class PlaceholderEntry {
      * Register the placeholder.
      */
     public void register() {
-        PlaceholderManager.registerPlaceholder(this);
+        PlaceholderManager.registerPlaceholder(this.toModernPlaceholder());
+    }
+
+    /**
+     * Convert the placeholder to a modern placeholder.
+     *
+     * @return The placeholder.
+     */
+    Placeholder toModernPlaceholder() {
+        if (this.requiresPlayer) {
+            return new PlayerPlaceholder(
+                    Objects.requireNonNullElse(plugin, Eco.getHandler().getEcoPlugin()),
+                    identifier,
+                    function
+            );
+        } else {
+            return new PlayerlessPlaceholder(
+                    Objects.requireNonNullElse(plugin, Eco.getHandler().getEcoPlugin()),
+                    identifier,
+                    () -> function.apply(null)
+            );
+        }
     }
 
     @Override

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderManager.java

@@ -4,11 +4,16 @@ import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.LoadingCache;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.placeholder.Placeholder;
+import com.willfp.eco.core.placeholder.PlayerPlaceholder;
+import com.willfp.eco.core.placeholder.PlayerlessPlaceholder;
+import com.willfp.eco.core.placeholder.StaticPlaceholder;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -19,11 +24,12 @@ import java.util.concurrent.TimeUnit;
 /**
  * Class to handle placeholder integrations.
  */
+@SuppressWarnings("removal")
 public final class PlaceholderManager {
     /**
      * All registered placeholders.
      */
-    private static final Map<EcoPlugin, Map<String, PlaceholderEntry>> REGISTERED_PLACEHOLDERS = new HashMap<>();
+    private static final Map<EcoPlugin, Map<String, Placeholder>> REGISTERED_PLACEHOLDERS = new HashMap<>();
 
     /**
      * All registered placeholder integrations.
@@ -35,7 +41,7 @@ public final class PlaceholderManager {
      */
     private static final LoadingCache<EntryWithPlayer, String> PLACEHOLDER_CACHE = Caffeine.newBuilder()
             .expireAfterWrite(50, TimeUnit.MILLISECONDS)
-            .build(key -> key.entry.getResult(key.player));
+            .build(key -> key.entry.getValue(key.player));
 
     /**
      * Register a new placeholder integration.
@@ -50,16 +56,31 @@ public final class PlaceholderManager {
     /**
      * Register a placeholder.
      *
-     * @param expansion The {@link com.willfp.eco.core.integrations.placeholder.PlaceholderEntry} to register.
+     * @param placeholder The placeholder to register.
      */
-    public static void registerPlaceholder(@NotNull final PlaceholderEntry expansion) {
-        EcoPlugin plugin = expansion.getPlugin() == null ? Eco.getHandler().getEcoPlugin() : expansion.getPlugin();
-        Map<String, PlaceholderEntry> pluginPlaceholders = REGISTERED_PLACEHOLDERS
+    public static void registerPlaceholder(@NotNull final Placeholder placeholder) {
+        if (placeholder instanceof StaticPlaceholder) {
+            throw new IllegalArgumentException("Static placeholders cannot be registered!");
+        }
+
+        EcoPlugin plugin = placeholder.getPlugin() == null ? Eco.getHandler().getEcoPlugin() : placeholder.getPlugin();
+        Map<String, Placeholder> pluginPlaceholders = REGISTERED_PLACEHOLDERS
                 .getOrDefault(plugin, new HashMap<>());
-        pluginPlaceholders.put(expansion.getIdentifier(), expansion);
+        pluginPlaceholders.put(placeholder.getIdentifier(), placeholder);
         REGISTERED_PLACEHOLDERS.put(plugin, pluginPlaceholders);
     }
 
+    /**
+     * Register a placeholder.
+     *
+     * @param placeholder The placeholder to register.
+     * @deprecated Uses old placeholder system.
+     */
+    @Deprecated(since = "6.28.0", forRemoval = true)
+    public static void registerPlaceholder(@NotNull final PlaceholderEntry placeholder) {
+        registerPlaceholder(placeholder.toModernPlaceholder());
+    }
+
     /**
      * Get the result of a placeholder with respect to a player.
      *
@@ -82,29 +103,36 @@ public final class PlaceholderManager {
      * @param plugin     The plugin for the placeholder.
      * @return The value of the placeholder.
      */
+    @NotNull
     public static String getResult(@Nullable final Player player,
                                    @NotNull final String identifier,
                                    @Nullable final EcoPlugin plugin) {
         EcoPlugin owner = plugin == null ? Eco.getHandler().getEcoPlugin() : plugin;
-        PlaceholderEntry entry = REGISTERED_PLACEHOLDERS.getOrDefault(owner, new HashMap<>()).get(identifier.toLowerCase());
+        Placeholder placeholder = REGISTERED_PLACEHOLDERS.getOrDefault(owner, new HashMap<>()).get(identifier.toLowerCase());
 
-        if (entry == null && plugin != null) {
-            PlaceholderEntry alternate = REGISTERED_PLACEHOLDERS.getOrDefault(Eco.getHandler().getEcoPlugin(), new HashMap<>())
+        if (placeholder == null && plugin != null) {
+            Placeholder alternate = REGISTERED_PLACEHOLDERS.getOrDefault(Eco.getHandler().getEcoPlugin(), new HashMap<>())
                     .get(identifier.toLowerCase());
             if (alternate != null) {
-                entry = alternate;
+                placeholder = alternate;
             }
         }
 
-        if (entry == null) {
+        if (placeholder == null) {
             return "";
         }
 
-        if (player == null && entry.requiresPlayer()) {
+        if (placeholder instanceof PlayerPlaceholder playerPlaceholder) {
+            if (player == null) {
+                return "";
+            } else {
+                return PLACEHOLDER_CACHE.get(new EntryWithPlayer(playerPlaceholder, player));
+            }
+        } else if (placeholder instanceof PlayerlessPlaceholder playerlessPlaceholder) {
+            return playerlessPlaceholder.getValue();
+        } else {
             return "";
         }
-
-        return PLACEHOLDER_CACHE.get(new EntryWithPlayer(entry, player));
     }
 
     /**
@@ -116,10 +144,28 @@ public final class PlaceholderManager {
      */
     public static String translatePlaceholders(@NotNull final String text,
                                                @Nullable final Player player) {
+        return translatePlaceholders(text, player, Collections.emptyList());
+    }
+
+    /**
+     * Translate all placeholders with respect to a player.
+     *
+     * @param text    The text that may contain placeholders to translate.
+     * @param player  The player to translate the placeholders with respect to.
+     * @param statics Extra static placeholders.
+     * @return The text, translated.
+     */
+    public static String translatePlaceholders(@NotNull final String text,
+                                               @Nullable final Player player,
+                                               @NotNull final List<StaticPlaceholder> statics) {
         String processed = text;
         for (PlaceholderIntegration integration : REGISTERED_INTEGRATIONS) {
             processed = integration.translate(processed, player);
         }
+        for (StaticPlaceholder placeholder : statics) {
+            // Do I know this is a bad way of doing this? Yes.
+            processed = processed.replace("%" + placeholder.getIdentifier() + "%", placeholder.getValue());
+        }
         return processed;
     }
 
@@ -138,8 +184,8 @@ public final class PlaceholderManager {
         return found;
     }
 
-    private static record EntryWithPlayer(@NotNull PlaceholderEntry entry,
-                                          @Nullable Player player) {
+    private record EntryWithPlayer(@NotNull PlayerPlaceholder entry,
+                                   @NotNull Player player) {
 
     }
 

eco-api/src/main/java/com/willfp/eco/core/items/Items.java

@@ -8,10 +8,12 @@ import com.willfp.eco.core.recipe.parts.EmptyTestableItem;
 import com.willfp.eco.core.recipe.parts.MaterialTestableItem;
 import com.willfp.eco.core.recipe.parts.ModifiedTestableItem;
 import com.willfp.eco.core.recipe.parts.TestableStack;
+import com.willfp.eco.core.recipe.parts.UnrestrictedMaterialTestableItem;
 import com.willfp.eco.util.NamespacedKeyUtils;
 import com.willfp.eco.util.NumberUtils;
 import org.bukkit.Material;
 import org.bukkit.NamespacedKey;
+import org.bukkit.enchantments.Enchantment;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
@@ -114,6 +116,48 @@ public final class Items {
         REGISTRY.remove(key);
     }
 
+    /**
+     * Turn an ItemStack back into a lookup string.
+     *
+     * @param itemStack The ItemStack.
+     * @return The lookup string.
+     */
+    @NotNull
+    public static String toLookupString(@Nullable final ItemStack itemStack) {
+        if (itemStack == null) {
+            return "";
+        }
+
+        StringBuilder builder = new StringBuilder();
+
+        CustomItem customItem = getCustomItem(itemStack);
+
+        if (customItem != null) {
+            builder.append(customItem.getKey());
+        } else {
+            builder.append(itemStack.getType().name().toLowerCase());
+        }
+
+        if (itemStack.getAmount() > 1) {
+            builder.append(" ")
+                    .append(itemStack.getAmount());
+        }
+
+        ItemMeta meta = itemStack.getItemMeta();
+
+        if (meta != null) {
+            for (LookupArgParser parser : ARG_PARSERS) {
+                String parsed = parser.serializeBack(meta);
+                if (parsed != null) {
+                    builder.append(" ")
+                            .append(parsed);
+                }
+            }
+        }
+
+        return builder.toString();
+    }
+
     /**
      * This is the backbone of the entire eco item system.
      * <p>
@@ -155,11 +199,16 @@ public final class Items {
         String[] split = args[0].toLowerCase().split(":");
 
         if (split.length == 1) {
-            Material material = Material.getMaterial(args[0].toUpperCase());
+            String itemType = args[0];
+            boolean isWildcard = itemType.startsWith("*");
+            if (isWildcard) {
+                itemType = itemType.substring(1);
+            }
+            Material material = Material.getMaterial(itemType.toUpperCase());
             if (material == null || material == Material.AIR) {
                 return new EmptyTestableItem();
             }
-            item = new MaterialTestableItem(material);
+            item = isWildcard ? new UnrestrictedMaterialTestableItem(material) : new MaterialTestableItem(material);
         }
 
         if (split.length == 2) {
@@ -183,11 +232,16 @@ public final class Items {
             This has been superseded by id amount
              */
             if (part == null) {
-                Material material = Material.getMaterial(split[0].toUpperCase());
+                String itemType = split[0];
+                boolean isWildcard = itemType.startsWith("*");
+                if (isWildcard) {
+                    itemType = itemType.substring(1);
+                }
+                Material material = Material.getMaterial(itemType.toUpperCase());
                 if (material == null || material == Material.AIR) {
                     return new EmptyTestableItem();
                 }
-                item = new MaterialTestableItem(material);
+                item = isWildcard ? new UnrestrictedMaterialTestableItem(material) : new MaterialTestableItem(material);
                 stackAmount = Integer.parseInt(split[1]);
             } else {
                 item = part;
@@ -298,7 +352,7 @@ public final class Items {
      * @param itemStack The itemStack to check.
      * @return If is recipe.
      */
-    public static boolean isCustomItem(@NotNull final ItemStack itemStack) {
+    public static boolean isCustomItem(@Nullable final ItemStack itemStack) {
         return getCustomItem(itemStack) != null;
     }
 
@@ -309,7 +363,11 @@ public final class Items {
      * @return The custom item, or null if not exists.
      */
     @Nullable
-    public static CustomItem getCustomItem(@NotNull final ItemStack itemStack) {
+    public static CustomItem getCustomItem(@Nullable final ItemStack itemStack) {
+        if (itemStack == null) {
+            return null;
+        }
+
         return CACHE.get(HashedItem.of(itemStack)).map(Items::getOrWrap).orElse(null);
     }
 
@@ -373,6 +431,64 @@ public final class Items {
         return items;
     }
 
+    /**
+     * Merge ItemStack onto another ItemStack.
+     *
+     * @param from The ItemStack to merge from.
+     * @param to   The ItemStack to merge onto.
+     * @return The ItemStack, merged (same instance as to).
+     */
+    @NotNull
+    public static ItemStack mergeFrom(@NotNull final ItemStack from,
+                                      @NotNull final ItemStack to) {
+        ItemMeta fromMeta = from.getItemMeta();
+        ItemMeta toMeta = to.getItemMeta();
+
+        if (fromMeta == null || toMeta == null) {
+            return to;
+        }
+
+        ItemMeta newMeta = mergeFrom(fromMeta, toMeta);
+
+        to.setItemMeta(newMeta);
+        to.setType(from.getType());
+        to.setAmount(from.getAmount());
+        return to;
+    }
+
+    /**
+     * Merge ItemMeta onto other ItemMeta.
+     *
+     * @param from The ItemMeta to merge from.
+     * @param to   The ItemMeta to merge onto.
+     * @return The ItemMeta, merged (same instance as to).
+     */
+    @NotNull
+    public static ItemMeta mergeFrom(@NotNull final ItemMeta from,
+                                     @NotNull final ItemMeta to) {
+        if (from.hasDisplayName()) {
+            to.setDisplayName(from.getDisplayName());
+        }
+
+        to.setLore(from.getLore());
+
+        for (Enchantment enchant : to.getEnchants().keySet()) {
+            to.removeEnchant(enchant);
+        }
+
+        for (Map.Entry<Enchantment, Integer> entry : from.getEnchants().entrySet()) {
+            to.addEnchant(entry.getKey(), entry.getValue(), true);
+        }
+
+        if (from.hasCustomModelData()) {
+            to.setCustomModelData(from.getCustomModelData());
+        } else {
+            to.setCustomModelData(null);
+        }
+
+        return to;
+    }
+
     private Items() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/core/items/args/LookupArgParser.java

@@ -22,4 +22,14 @@ public interface LookupArgParser {
      */
     @Nullable Predicate<ItemStack> parseArguments(@NotNull String[] args,
                                                   @NotNull ItemMeta meta);
+
+    /**
+     * Serialize the item back to a string.
+     *
+     * @param meta The ItemMeta.
+     * @return The string, or null if not required.
+     */
+    default @Nullable String serializeBack(@NotNull final ItemMeta meta) {
+        return null;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/items/builder/AbstractItemStackBuilder.java

@@ -59,6 +59,10 @@ public abstract class AbstractItemStackBuilder<T extends ItemMeta, U extends Abs
      * @param base The ItemStack to start with.
      */
     protected AbstractItemStackBuilder(@NotNull final ItemStack base) {
+        if (base.getType() == Material.AIR) {
+            base.setType(Material.STONE); // Prevents NPEs.
+        }
+
         this.base = base;
         this.meta = (T) base.getItemMeta();
         assert meta != null;

eco-api/src/main/java/com/willfp/eco/core/lookup/LookupHandler.java

@@ -16,7 +16,7 @@ public interface LookupHandler<T extends Testable<?>> {
      * <p>
      * You shouldn't override this method unless you're doing something
      * technically interesting or weird. This is the entry point for all
-     * lookup parsers, {@link this#parse(String[])} is to specify implementation-specific
+     * lookup parsers, parse() is to specify implementation-specific
      * parsing.
      *
      * @param key The key.
@@ -56,7 +56,7 @@ public interface LookupHandler<T extends Testable<?>> {
     /**
      * Get the failsafe object.
      * <p>
-     * A failsafe object should never pass {@link this#validate(Testable)}, as this will
+     * A failsafe object should never pass validate(), as this will
      * cause issues with segment parsers. See {@link com.willfp.eco.core.items.ItemsLookupHandler} and
      * {@link com.willfp.eco.core.recipe.parts.EmptyTestableItem} for examples.
      *

eco-api/src/main/java/com/willfp/eco/core/placeholder/Placeholder.java

@@ -0,0 +1,22 @@
+package com.willfp.eco.core.placeholder;
+
+import com.willfp.eco.core.EcoPlugin;
+
+/**
+ * A placeholder represents a string that can hold a value.
+ */
+public sealed interface Placeholder permits PlayerPlaceholder, PlayerlessPlaceholder, StaticPlaceholder {
+    /**
+     * Get the plugin that holds the placeholder.
+     *
+     * @return The plugin.
+     */
+    EcoPlugin getPlugin();
+
+    /**
+     * Get the identifier for the placeholder.
+     *
+     * @return The identifier.
+     */
+    String getIdentifier();
+}

eco-api/src/main/java/com/willfp/eco/core/placeholder/PlaceholderInjectable.java

@@ -0,0 +1,38 @@
+package com.willfp.eco.core.placeholder;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.List;
+
+/**
+ * Represents a class that can have placeholders injected into it.
+ */
+public interface PlaceholderInjectable {
+    /**
+     * Inject placeholder.
+     *
+     * @param placeholders The placeholders.
+     */
+    default void injectPlaceholders(@NotNull StaticPlaceholder... placeholders) {
+        this.injectPlaceholders(List.of(placeholders));
+    }
+
+    /**
+     * Inject placeholder.
+     *
+     * @param placeholders The placeholders.
+     */
+    void injectPlaceholders(@NotNull Iterable<StaticPlaceholder> placeholders);
+
+    /**
+     * Clear injected placeholders.
+     */
+    void clearInjectedPlaceholders();
+
+    /**
+     * Get injected placeholders.
+     *
+     * @return Injected placeholders.
+     */
+    List<StaticPlaceholder> getInjectedPlaceholders();
+}

eco-api/src/main/java/com/willfp/eco/core/placeholder/PlayerPlaceholder.java

@@ -0,0 +1,92 @@
+package com.willfp.eco.core.placeholder;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.function.Function;
+
+/**
+ * A placeholder that requires a player.
+ */
+public final class PlayerPlaceholder implements Placeholder {
+    /**
+     * The name of the placeholder.
+     */
+    private final String identifier;
+
+    /**
+     * The function to retrieve the output of the placeholder given a player.
+     */
+    private final Function<Player, String> function;
+
+    /**
+     * The plugin for the placeholder.
+     */
+    private final EcoPlugin plugin;
+
+    /**
+     * Create a new player placeholder.
+     *
+     * @param plugin     The plugin.
+     * @param identifier The identifier.
+     * @param function   The function to retrieve the value.
+     */
+    public PlayerPlaceholder(@NotNull final EcoPlugin plugin,
+                             @NotNull final String identifier,
+                             @NotNull final Function<Player, String> function) {
+        this.plugin = plugin;
+        this.identifier = identifier;
+        this.function = function;
+    }
+
+    /**
+     * Get the value of the placeholder for a given player.
+     *
+     * @param player The player.
+     * @return The value.
+     */
+    public String getValue(@NotNull final Player player) {
+        return function.apply(player);
+    }
+
+    /**
+     * Register the placeholder.
+     *
+     * @return The placeholder.
+     */
+    public PlayerPlaceholder register() {
+        PlaceholderManager.registerPlaceholder(this);
+        return this;
+    }
+
+    @Override
+    public EcoPlugin getPlugin() {
+        return this.plugin;
+    }
+
+    @Override
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    @Override
+    public boolean equals(@Nullable final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof StaticPlaceholder that)) {
+            return false;
+        }
+        return Objects.equals(this.getIdentifier(), that.getIdentifier())
+                && Objects.equals(this.getPlugin(), that.getPlugin());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.getIdentifier(), this.getPlugin());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/placeholder/PlayerlessPlaceholder.java

@@ -0,0 +1,90 @@
+package com.willfp.eco.core.placeholder;
+
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.integrations.placeholder.PlaceholderManager;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.function.Supplier;
+
+/**
+ * A placeholder that does not require a player.
+ */
+public final class PlayerlessPlaceholder implements Placeholder {
+    /**
+     * The name of the placeholder.
+     */
+    private final String identifier;
+
+    /**
+     * The function to retrieve the output of the placeholder.
+     */
+    private final Supplier<String> function;
+
+    /**
+     * The plugin for the placeholder.
+     */
+    private final EcoPlugin plugin;
+
+    /**
+     * Create a new player placeholder.
+     *
+     * @param plugin     The plugin.
+     * @param identifier The identifier.
+     * @param function   The function to retrieve the value.
+     */
+    public PlayerlessPlaceholder(@NotNull final EcoPlugin plugin,
+                                 @NotNull final String identifier,
+                                 @NotNull final Supplier<String> function) {
+        this.plugin = plugin;
+        this.identifier = identifier;
+        this.function = function;
+    }
+
+    /**
+     * Get the value of the placeholder.
+     *
+     * @return The value.
+     */
+    public String getValue() {
+        return function.get();
+    }
+
+    /**
+     * Register the placeholder.
+     *
+     * @return The placeholder.
+     */
+    public PlayerlessPlaceholder register() {
+        PlaceholderManager.registerPlaceholder(this);
+        return this;
+    }
+
+    @Override
+    public EcoPlugin getPlugin() {
+        return this.plugin;
+    }
+
+    @Override
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    @Override
+    public boolean equals(@Nullable final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof StaticPlaceholder that)) {
+            return false;
+        }
+        return Objects.equals(this.getIdentifier(), that.getIdentifier())
+                && Objects.equals(this.getPlugin(), that.getPlugin());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.getIdentifier(), this.getPlugin());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/placeholder/StaticPlaceholder.java

@@ -0,0 +1,71 @@
+package com.willfp.eco.core.placeholder;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.EcoPlugin;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.function.Supplier;
+
+/**
+ * A placeholder that cannot be registered, and exists purely in injection.
+ */
+public final class StaticPlaceholder implements Placeholder {
+    /**
+     * The name of the placeholder.
+     */
+    private final String identifier;
+
+    /**
+     * The function to retrieve the output of the placeholder.
+     */
+    private final Supplier<String> function;
+
+    /**
+     * Create a new player placeholder.
+     *
+     * @param identifier The identifier.
+     * @param function   The function to retrieve the value.
+     */
+    public StaticPlaceholder(@NotNull final String identifier,
+                             @NotNull final Supplier<String> function) {
+        this.identifier = identifier;
+        this.function = function;
+    }
+
+    /**
+     * Get the value of the placeholder.
+     *
+     * @return The value.
+     */
+    public String getValue() {
+        return function.get();
+    }
+
+    @Override
+    public EcoPlugin getPlugin() {
+        return Eco.getHandler().getEcoPlugin();
+    }
+
+    @Override
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    @Override
+    public boolean equals(@Nullable final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof StaticPlaceholder that)) {
+            return false;
+        }
+        return Objects.equals(this.getIdentifier(), that.getIdentifier());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.getIdentifier());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/proxy/exceptions/ProxyError.java

@@ -23,7 +23,7 @@ public class ProxyError extends Error {
      * @param message The message to send.
      * @deprecated Proxy Errors should include a cause.
      */
-    @Deprecated
+    @Deprecated(forRemoval = true)
     public ProxyError(@NotNull final String message) {
         super(message);
     }

eco-api/src/main/java/com/willfp/eco/core/proxy/exceptions/UnsupportedVersionException.java

@@ -8,6 +8,7 @@ import org.jetbrains.annotations.NotNull;
  *
  * @deprecated Poorly named, exception when it's actually an error, contains doubly nested errors.
  */
+@SuppressWarnings("removal")
 @Deprecated(since = "6.24.0", forRemoval = true)
 public class UnsupportedVersionException extends ProxyError {
     /**
@@ -16,7 +17,7 @@ public class UnsupportedVersionException extends ProxyError {
      * @param message The message to send.
      * @deprecated Use the default constructor.
      */
-    @Deprecated(since = "6.24.0")
+    @Deprecated(since = "6.24.0", forRemoval = true)
     public UnsupportedVersionException(@NotNull final String message) {
         super(message);
     }

eco-api/src/main/java/com/willfp/eco/core/recipe/parts/UnrestrictedMaterialTestableItem.java

@@ -0,0 +1,32 @@
+package com.willfp.eco.core.recipe.parts;
+
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Same as material testable items, but doesn't filter out custom items.
+ */
+public class UnrestrictedMaterialTestableItem extends MaterialTestableItem {
+    /**
+     * Create a new simple recipe part.
+     *
+     * @param material The material.
+     */
+    public UnrestrictedMaterialTestableItem(@NotNull final Material material) {
+        super(material);
+    }
+
+    /**
+     * If the item matches the material.
+     *
+     * @param itemStack The item to test.
+     * @return If the item is of the specified material.
+     */
+    @Override
+    public boolean matches(@Nullable final ItemStack itemStack) {
+        return itemStack != null && itemStack.getType() == this.getMaterial();
+    }
+}
+

eco-api/src/main/java/com/willfp/eco/core/recipe/recipes/ShapedCraftingRecipe.java

@@ -3,7 +3,6 @@ package com.willfp.eco.core.recipe.recipes;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginDependent;
-import com.willfp.eco.core.Prerequisite;
 import com.willfp.eco.core.items.TestableItem;
 import com.willfp.eco.core.recipe.Recipes;
 import com.willfp.eco.core.recipe.parts.EmptyTestableItem;
@@ -139,12 +138,6 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
             displayedRecipe.setIngredient(character, new RecipeChoice.ExactChoice(displayedItems));
         }
 
-        if (Prerequisite.HAS_1_18.isMet() && !Prerequisite.HAS_PAPER.isMet()) {
-            if (Bukkit.getServer().getRecipe(this.getKey()) != null) {
-                return;
-            }
-        }
-
         Bukkit.getServer().addRecipe(shapedRecipe);
         Bukkit.getServer().addRecipe(displayedRecipe);
     }

eco-api/src/main/java/com/willfp/eco/core/recipe/recipes/ShapelessCraftingRecipe.java

@@ -0,0 +1,343 @@
+package com.willfp.eco.core.recipe.recipes;
+
+import com.google.common.annotations.Beta;
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.PluginDependent;
+import com.willfp.eco.core.items.TestableItem;
+import com.willfp.eco.core.recipe.Recipes;
+import com.willfp.eco.core.recipe.parts.EmptyTestableItem;
+import com.willfp.eco.core.recipe.parts.GroupedTestableItems;
+import com.willfp.eco.core.recipe.parts.TestableStack;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.RecipeChoice;
+import org.bukkit.inventory.ShapelessRecipe;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Shapeless crafting recipe.
+ */
+@Beta
+public final class ShapelessCraftingRecipe extends PluginDependent<EcoPlugin> implements CraftingRecipe {
+    /**
+     * Recipe parts.
+     */
+    private final List<TestableItem> parts;
+
+    /**
+     * The key of the recipe.
+     */
+    private final NamespacedKey key;
+
+    /**
+     * The key of the displayed recipe.
+     */
+    private final NamespacedKey displayedKey;
+
+    /**
+     * The recipe's output.
+     */
+    private final ItemStack output;
+
+    /**
+     * The permission.
+     */
+    private final String permission;
+
+    private ShapelessCraftingRecipe(@NotNull final EcoPlugin plugin,
+                                    @NotNull final String key,
+                                    @NotNull final List<TestableItem> parts,
+                                    @NotNull final ItemStack output,
+                                    @Nullable final String permission) {
+        super(plugin);
+
+        this.parts = parts;
+        this.key = plugin.getNamespacedKeyFactory().create(key);
+        this.displayedKey = plugin.getNamespacedKeyFactory().create(key + "_displayed");
+        this.output = output;
+        this.permission = permission;
+    }
+
+    /**
+     * Make a new test.
+     *
+     * @return The test.
+     */
+    @NotNull
+    public RecipeTest newTest() {
+        return new RecipeTest(this);
+    }
+
+    @Override
+    public boolean test(@NotNull final ItemStack[] matrix) {
+        RecipeTest test = newTest();
+
+        for (ItemStack stack : matrix) {
+            if (test.matchAndRemove(stack) == null) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void register() {
+        Recipes.register(this);
+
+        Bukkit.getServer().removeRecipe(this.getKey());
+        Bukkit.getServer().removeRecipe(this.getDisplayedKey());
+
+        ShapelessRecipe shapelessRecipe = new ShapelessRecipe(this.getKey(), this.getOutput());
+        for (TestableItem part : parts) {
+            shapelessRecipe.addIngredient(part.getItem().getType());
+        }
+
+        ShapelessRecipe displayedRecipe = new ShapelessRecipe(this.getDisplayedKey(), this.getOutput());
+        for (TestableItem part : parts) {
+            List<TestableItem> items = new ArrayList<>();
+            if (part instanceof GroupedTestableItems group) {
+                items.addAll(group.getChildren());
+            } else {
+                items.add(part);
+            }
+
+            List<ItemStack> displayedItems = new ArrayList<>();
+
+            for (TestableItem testableItem : items) {
+                if (testableItem instanceof TestableStack) {
+                    ItemStack item = testableItem.getItem().clone();
+                    ItemMeta meta = item.getItemMeta();
+                    assert meta != null;
+
+                    List<String> lore = meta.hasLore() ? meta.getLore() : new ArrayList<>();
+                    assert lore != null;
+                    lore.add("");
+                    String add = Eco.getHandler().getEcoPlugin().getLangYml().getFormattedString("multiple-in-craft");
+                    add = add.replace("%amount%", String.valueOf(item.getAmount()));
+                    lore.add(add);
+                    meta.setLore(lore);
+                    item.setItemMeta(meta);
+
+                    displayedItems.add(item);
+                } else {
+                    displayedItems.add(testableItem.getItem());
+                }
+            }
+
+            displayedRecipe.addIngredient(new RecipeChoice.ExactChoice(displayedItems));
+        }
+
+        Bukkit.getServer().addRecipe(shapelessRecipe);
+        Bukkit.getServer().addRecipe(displayedRecipe);
+    }
+
+    /**
+     * Create a new recipe builder.
+     *
+     * @param plugin The plugin that owns the recipe.
+     * @param key    The recipe key.
+     * @return A new builder.
+     */
+    public static Builder builder(@NotNull final EcoPlugin plugin,
+                                  @NotNull final String key) {
+        return new Builder(plugin, key);
+    }
+
+    /**
+     * Get the parts.
+     *
+     * @return The parts.
+     */
+    @NotNull
+    @Override
+    public List<TestableItem> getParts() {
+        return this.parts;
+    }
+
+    /**
+     * Get the key.
+     *
+     * @return The key.
+     */
+    @NotNull
+    @Override
+    public NamespacedKey getKey() {
+        return this.key;
+    }
+
+    /**
+     * Get the displayed key.
+     *
+     * @return The displayed key.
+     */
+    @NotNull
+    @Override
+    public NamespacedKey getDisplayedKey() {
+        return this.displayedKey;
+    }
+
+    /**
+     * Get the output.
+     *
+     * @return The output.
+     */
+    @NotNull
+    @Override
+    public ItemStack getOutput() {
+        return this.output;
+    }
+
+    /**
+     * Get the permission.
+     *
+     * @return The permission.
+     */
+    @Nullable
+    @Override
+    public String getPermission() {
+        return permission;
+    }
+
+    /**
+     * Builder for recipes.
+     */
+    public static final class Builder {
+        /**
+         * The recipe parts.
+         */
+        private final List<TestableItem> recipeParts = new ArrayList<>();
+
+        /**
+         * The output of the recipe.
+         */
+        private ItemStack output = null;
+
+        /**
+         * The permission for the recipe.
+         */
+        private String permission = null;
+
+        /**
+         * The key of the recipe.
+         */
+        private final String key;
+
+        /**
+         * The plugin that created the recipe.
+         */
+        private final EcoPlugin plugin;
+
+        /**
+         * Create a new recipe builder.
+         *
+         * @param plugin The plugin that owns the recipe.
+         * @param key    The recipe key.
+         */
+        private Builder(@NotNull final EcoPlugin plugin,
+                        @NotNull final String key) {
+            this.key = key;
+            this.plugin = plugin;
+        }
+
+        /**
+         * Add a recipe part.
+         *
+         * @param part The part of the recipe.
+         * @return The builder.
+         */
+        public Builder addRecipePart(@NotNull final TestableItem part) {
+            recipeParts.add(part);
+            return this;
+        }
+
+        /**
+         * Set the output of the recipe.
+         *
+         * @param output The output.
+         * @return The builder.
+         */
+        public Builder setOutput(@NotNull final ItemStack output) {
+            this.output = output;
+            return this;
+        }
+
+        /**
+         * Set the permission required to craft the recipe.
+         *
+         * @param permission The permission.
+         * @return The builder.
+         */
+        public Builder setPermission(@Nullable final String permission) {
+            this.permission = permission;
+            return this;
+        }
+
+        /**
+         * Check if recipe parts are all air.
+         *
+         * @return If recipe parts are all air.
+         */
+        public boolean isAir() {
+            for (TestableItem recipePart : this.recipeParts) {
+                if (recipePart != null && !(recipePart instanceof EmptyTestableItem)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        /**
+         * Build the recipe.
+         *
+         * @return The built recipe.
+         */
+        public ShapelessCraftingRecipe build() {
+            return new ShapelessCraftingRecipe(plugin, key.toLowerCase(), recipeParts, output, permission);
+        }
+    }
+
+    /**
+     * Test for shapeless recipes.
+     */
+    public static final class RecipeTest {
+        /**
+         * The remaining items left to be found.
+         */
+        private final List<TestableItem> remaining;
+
+        private RecipeTest(@NotNull final ShapelessCraftingRecipe recipe) {
+            this.remaining = new ArrayList<>(recipe.getParts());
+        }
+
+        /**
+         * If the item is in the recipe, remove it from the remaining items to test and
+         * return the matching item.
+         *
+         * @param itemStack The item.
+         * @return The matching item, or null if no match was found.
+         */
+        @Nullable
+        public TestableItem matchAndRemove(@NotNull final ItemStack itemStack) {
+            if (remaining.isEmpty() && !(new EmptyTestableItem().matches(itemStack))) {
+                return null;
+            }
+
+            Optional<TestableItem> match = remaining.stream()
+                    .filter(item -> item.matches(itemStack))
+                    .findFirst();
+
+            match.ifPresent(remaining::remove);
+
+            return match.orElse(null);
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/util/DurabilityUtils.java

@@ -28,7 +28,7 @@ public final class DurabilityUtils {
      * @param slot   The slot in the inventory of the item.
      * @deprecated The slot is not required.
      */
-    @Deprecated(since = "6.24.0")
+    @Deprecated(since = "6.24.0", forRemoval = true)
     public static void damageItem(@NotNull final Player player,
                                   @NotNull final ItemStack item,
                                   final int damage,

eco-api/src/main/java/com/willfp/eco/util/NumberUtils.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.util;
 
+import com.willfp.eco.core.placeholder.StaticPlaceholder;
 import org.apache.commons.lang.Validate;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.ApiStatus;
@@ -7,10 +8,10 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.text.DecimalFormat;
+import java.util.Collections;
 import java.util.Map;
 import java.util.TreeMap;
 import java.util.concurrent.ThreadLocalRandom;
-import java.util.function.BiFunction;
 
 /**
  * Utilities / API methods for numbers.
@@ -24,7 +25,7 @@ public final class NumberUtils {
     /**
      * Crunch handler.
      */
-    private static BiFunction<String, Player, Double> crunch = null;
+    private static CrunchHandler crunch = null;
 
     /**
      * Set of roman numerals to look up.
@@ -109,7 +110,7 @@ public final class NumberUtils {
      * @return The new value.
      * @deprecated Pointless method.
      */
-    @Deprecated(since = "6.19.0")
+    @Deprecated(since = "6.19.0", forRemoval = true)
     public static double equalIfOver(final double toChange,
                                      final double limit) {
         return Math.min(toChange, limit);
@@ -251,7 +252,21 @@ public final class NumberUtils {
      */
     public static double evaluateExpression(@NotNull final String expression,
                                             @Nullable final Player player) {
-        return crunch.apply(expression, player);
+        return evaluateExpression(expression, player, Collections.emptyList());
+    }
+
+    /**
+     * Evaluate an expression with respect to a player (for placeholders).
+     *
+     * @param expression The expression.
+     * @param player     The player.
+     * @param statics    The static placeholders.
+     * @return The value of the expression, or zero if invalid.
+     */
+    public static double evaluateExpression(@NotNull final String expression,
+                                            @Nullable final Player player,
+                                            @NotNull final Iterable<StaticPlaceholder> statics) {
+        return crunch.evaluate(expression, player, statics);
     }
 
     /**
@@ -260,11 +275,29 @@ public final class NumberUtils {
      * @param handler The handler.
      */
     @ApiStatus.Internal
-    public static void initCrunch(@NotNull final BiFunction<String, Player, Double> handler) {
+    public static void initCrunch(@NotNull final CrunchHandler handler) {
         Validate.isTrue(crunch == null, "Already initialized!");
         crunch = handler;
     }
 
+    /**
+     * Bridge component for crunch.
+     */
+    @ApiStatus.Internal
+    public interface CrunchHandler {
+        /**
+         * Evaluate an expression.
+         *
+         * @param expression The expression.
+         * @param player     The player.
+         * @param statics    The statics.
+         * @return The value of the expression, or zero if invalid.
+         */
+        double evaluate(@NotNull String expression,
+                        @Nullable Player player,
+                        @NotNull Iterable<StaticPlaceholder> statics);
+    }
+
     private NumberUtils() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/util/TeamUtils.java

@@ -71,7 +71,7 @@ public final class TeamUtils {
      * @deprecated Stupid method.
      */
     @NotNull
-    @Deprecated(since = "6.24.0")
+    @Deprecated(since = "6.24.0", forRemoval = true)
     public static Team getMaterialColorTeam(@NotNull final Material material) {
         return fromChatColor(MATERIAL_COLORS.getOrDefault(material, ChatColor.WHITE));
     }

eco-api/src/main/kotlin/com/willfp/eco/core/items/Items.kt

@@ -0,0 +1,24 @@
+@file:JvmName("ItemsExtensions")
+
+package com.willfp.eco.core.items
+
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+
+/**
+ * @see Items.toLookupString
+ */
+fun ItemStack?.toLookupString(): String =
+    Items.toLookupString(this)
+
+/**
+ * @see Items.mergeFrom
+ */
+fun ItemStack.mergeFrom(other: ItemStack): ItemStack =
+    Items.mergeFrom(other, this)
+
+/**
+ * @see Items.mergeFrom
+ */
+fun ItemMeta.mergeFrom(other: ItemMeta): ItemMeta =
+    Items.mergeFrom(other, this)

eco-core/core-backend/build.gradle

@@ -2,10 +2,12 @@ group 'com.willfp'
 version rootProject.version
 
 dependencies {
+    // Libraries
+    implementation 'org.reflections:reflections:0.9.12'
+    implementation 'org.objenesis:objenesis:3.2'
+
     compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
     compileOnly 'me.clip:placeholderapi:2.10.10'
-    compileOnly 'org.reflections:reflections:0.9.12'
     compileOnly 'net.kyori:adventure-text-minimessage:4.10.0'
     compileOnly 'net.kyori:adventure-platform-bukkit:4.1.0'
-    compileOnly 'org.objenesis:objenesis:3.2'
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/ConfigUtils.kt

@@ -0,0 +1,125 @@
+@file:Suppress("UNCHECKED_CAST")
+
+package com.willfp.eco.internal.config
+
+import com.willfp.eco.core.config.ConfigType
+import org.bukkit.configuration.file.YamlConstructor
+import org.yaml.snakeyaml.DumperOptions
+import org.yaml.snakeyaml.LoaderOptions
+import org.yaml.snakeyaml.Yaml
+import java.io.BufferedReader
+import java.io.Reader
+
+fun ConfigType.toMap(input: String?): Map<String, Any?> =
+    this.handler.toMap(input)
+
+fun ConfigType.toString(map: Map<String, Any?>): String =
+    this.handler.toString(map)
+
+fun Any?.constrainConfigTypes(type: ConfigType): Any? = when (this) {
+    is Map<*, *> -> EcoConfigSection(type, this.normalizeToConfig(type))
+    is Iterable<*> -> {
+        if (this.firstOrNull() == null) {
+            mutableListOf<Any>()
+        } else if (this.firstOrNull() is Map<*, *>) {
+            this as Iterable<Map<*, *>>
+            this.map { map -> EcoConfigSection(type, map.normalizeToConfig(type)) }
+        } else {
+            this.toMutableList()
+        }
+    }
+    else -> this
+}
+
+fun Map<*, *>.normalizeToConfig(type: ConfigType): Map<String, Any?> {
+    val building = mutableMapOf<String, Any?>()
+
+    for ((unprocessedKey, value) in this.entries) {
+        if (unprocessedKey == null || value == null) {
+            continue
+        }
+
+        val key = unprocessedKey.toString()
+
+        val constrained = value.constrainConfigTypes(type)
+
+        building[key] = constrained
+    }
+
+    return building
+}
+
+fun Reader.readToString(): String {
+    val input = this as? BufferedReader ?: BufferedReader(this)
+    val builder = StringBuilder()
+
+    var line: String?
+    input.use {
+        while (it.readLine().also { read -> line = read } != null) {
+            builder.append(line)
+            builder.append('\n')
+        }
+    }
+
+    return builder.toString()
+}
+
+private val ConfigType.handler: ConfigTypeHandler
+    get() = if (this == ConfigType.JSON) JSONConfigTypeHandler else YamlConfigTypeHandler
+
+private abstract class ConfigTypeHandler(
+    val type: ConfigType
+) {
+    fun toMap(input: String?): Map<String, Any?> {
+        if (input == null || input.isBlank()) {
+            return emptyMap()
+        }
+
+        return parseToMap(input).normalizeToConfig(type)
+    }
+
+    protected abstract fun parseToMap(input: String): Map<*, *>
+
+    abstract fun toString(map: Map<String, Any?>): String
+}
+
+private object YamlConfigTypeHandler : ConfigTypeHandler(ConfigType.YAML) {
+    private fun newYaml(): Yaml {
+        val yamlOptions = DumperOptions()
+        val loaderOptions = LoaderOptions()
+        val representer = EcoRepresenter()
+
+        loaderOptions.maxAliasesForCollections = Int.MAX_VALUE
+        loaderOptions.isAllowDuplicateKeys = false
+
+        yamlOptions.indent = 2
+        yamlOptions.defaultFlowStyle = DumperOptions.FlowStyle.BLOCK
+
+        representer.defaultFlowStyle = DumperOptions.FlowStyle.BLOCK
+
+        return Yaml(
+            YamlConstructor(),
+            representer,
+            yamlOptions,
+            loaderOptions,
+        )
+    }
+
+    override fun parseToMap(input: String): Map<*, *> {
+        return newYaml().load(input) ?: emptyMap<Any, Any>()
+    }
+
+    override fun toString(map: Map<String, Any?>): String {
+        return newYaml().dump(map)
+    }
+}
+
+private object JSONConfigTypeHandler : ConfigTypeHandler(ConfigType.JSON) {
+    override fun parseToMap(input: String): Map<*, *> {
+        return EcoGsonSerializer.gson.fromJson(input, Map::class.java)
+    }
+
+    override fun toString(map: Map<String, Any?>): String {
+        return EcoGsonSerializer.gson.toJson(map)
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfig.kt

@@ -0,0 +1,195 @@
+package com.willfp.eco.internal.config
+
+import com.willfp.eco.core.config.ConfigType
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.placeholder.StaticPlaceholder
+import com.willfp.eco.util.StringUtils
+import org.bukkit.configuration.file.YamlConfiguration
+import java.util.concurrent.ConcurrentHashMap
+
+@Suppress("UNCHECKED_CAST")
+open class EcoConfig(
+    private val configType: ConfigType
+) : Config {
+    private val values = ConcurrentHashMap<String, Any?>()
+
+    @Transient
+    var injections = mutableListOf<StaticPlaceholder>()
+
+    fun init(values: Map<String, Any?>) {
+        this.values.clear()
+        this.values.putAll(values.normalizeToConfig(this.type))
+    }
+
+    override fun toPlaintext(): String {
+        return configType.toString(this.values)
+    }
+
+    override fun has(path: String): Boolean {
+        return get(path) != null
+    }
+
+    override fun getKeys(deep: Boolean): List<String> {
+        return if (deep) {
+            recurseKeys(mutableSetOf(), "")
+        } else {
+            values.keys.toList()
+        }
+    }
+
+    override fun recurseKeys(current: MutableSet<String>, root: String): List<String> {
+        val list = mutableSetOf<String>()
+        for (key in getKeys(false)) {
+            list.add("$root$key")
+            val found = get(key)
+            if (found is Config) {
+                list.addAll(found.recurseKeys(current, "$root$key."))
+            }
+        }
+
+        return list.toList()
+    }
+
+    override fun get(path: String): Any? {
+        val nearestPath = path.split(".")[0]
+
+        if (path.contains(".")) {
+            val remainingPath = path.removePrefix("${nearestPath}.")
+
+            if (remainingPath.isEmpty()) {
+                return null
+            }
+
+            val first = get(nearestPath)
+
+            return if (first is Config) {
+                first.get(remainingPath)
+            } else {
+                null
+            }
+        }
+
+        return values[nearestPath]
+    }
+
+    override fun set(
+        path: String,
+        obj: Any?
+    ) {
+        val nearestPath = path.split(".")[0]
+
+        if (path.contains(".")) {
+            val remainingPath = path.removePrefix("${nearestPath}.")
+
+            if (remainingPath.isEmpty()) {
+                return
+            }
+
+            val section = getSubsection(nearestPath) // Creates a section if null, therefore it can be set.
+            section.set(remainingPath, obj)
+            values[nearestPath] = section // Set the value
+            return
+        }
+
+        if (obj == null) {
+            values.remove(nearestPath)
+        } else {
+            values[nearestPath] = obj.constrainConfigTypes(type)
+        }
+    }
+
+    override fun getSubsection(path: String): Config {
+        return getSubsectionOrNull(path) ?: EcoConfigSection(type, injections = injections)
+    }
+
+    override fun getSubsectionOrNull(path: String): Config? {
+        return get(path) as? Config
+    }
+
+    override fun getSubsectionsOrNull(path: String): List<Config>? {
+        return (get(path) as? Iterable<Config>)?.toList()
+    }
+
+    override fun getType(): ConfigType {
+        return configType
+    }
+
+    override fun getIntOrNull(path: String): Int? {
+        return (get(path) as? Number)?.toInt()
+    }
+
+    override fun getIntsOrNull(path: String): List<Int>? {
+        return (get(path) as? Iterable<Number>)?.map { it.toInt() }
+    }
+
+    override fun getBoolOrNull(path: String): Boolean? {
+        return get(path) as? Boolean
+    }
+
+    override fun getBoolsOrNull(path: String): List<Boolean>? {
+        return (get(path) as? Iterable<Boolean>)?.toList()
+    }
+
+    override fun getStringOrNull(
+        path: String,
+        format: Boolean,
+        option: StringUtils.FormatOption
+    ): String? {
+        val string = get(path)?.toString() ?: return null
+        return if (format) StringUtils.format(string, option) else string
+    }
+
+    override fun getStringsOrNull(
+        path: String,
+        format: Boolean,
+        option: StringUtils.FormatOption
+    ): List<String>? {
+        val strings = (get(path) as? Iterable<*>)?.map { it.toString() } ?: return null
+        return if (format) StringUtils.formatList(strings, option) else strings
+    }
+
+    override fun getDoubleOrNull(path: String): Double? {
+        return (get(path) as? Number)?.toDouble()
+    }
+
+    override fun getDoublesOrNull(path: String): List<Double>? {
+        return (get(path) as? Iterable<Number>)?.map { it.toDouble() }
+    }
+
+    override fun injectPlaceholders(placeholders: Iterable<StaticPlaceholder>) {
+        injections.removeIf { placeholders.any { placeholder -> it.identifier == placeholder.identifier } }
+        injections.addAll(placeholders)
+    }
+
+    override fun getInjectedPlaceholders(): List<StaticPlaceholder> {
+        return injections.toList()
+    }
+
+    override fun clearInjectedPlaceholders() {
+        injections.clear()
+    }
+
+    override fun toMap(): MutableMap<String, Any?> {
+        return values.toMutableMap()
+    }
+
+    override fun toBukkit(): YamlConfiguration {
+        val temp = YamlConfiguration()
+        temp.createSection("temp", this.values.toMap())
+        val section = temp.getConfigurationSection("temp")!!
+
+        val bukkit = YamlConfiguration()
+        for (key in section.getKeys(true)) {
+            bukkit.set(key, section.get(key))
+        }
+        return bukkit
+    }
+
+    override fun clone(): Config {
+        return EcoConfigSection(type, this.values.toMutableMap(), injections)
+    }
+
+    override fun toString(): String {
+        return this.toPlaintext()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigFactory.kt

@@ -5,61 +5,39 @@ import com.willfp.eco.core.config.ConfigType
 import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.core.config.interfaces.LoadableConfig
 import com.willfp.eco.core.config.wrapper.ConfigFactory
-import com.willfp.eco.internal.config.json.EcoJSONConfigSection
-import com.willfp.eco.internal.config.json.EcoJSONConfigWrapper
-import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
-import com.willfp.eco.internal.config.json.EcoUpdatableJSONConfig
-import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
-import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
-import com.willfp.eco.internal.config.yaml.EcoYamlConfigSection
-import org.bukkit.configuration.file.YamlConfiguration
-import java.io.StringReader
+import org.bukkit.configuration.ConfigurationSection
 
 object EcoConfigFactory : ConfigFactory {
-    override fun createConfig(config: YamlConfiguration): Config {
-        return EcoYamlConfigSection(config)
-    }
-
-    override fun createConfig(values: MutableMap<String, Any>): Config {
-        return EcoJSONConfigSection(values)
-    }
-
-    override fun createConfig(contents: String, type: ConfigType): Config {
-        return if (type == ConfigType.JSON) {
-            @Suppress("UNCHECKED_CAST")
-            EcoJSONConfigSection(
-                EcoJSONConfigWrapper.gson.fromJson(
-                    StringReader(contents), Map::class.java
-                ) as MutableMap<String, Any>
-            )
-        } else {
-            EcoYamlConfigSection(YamlConfiguration.loadConfiguration(StringReader(contents)))
+    override fun createConfig(bukkit: ConfigurationSection): Config {
+        val config = createConfig(emptyMap(), ConfigType.YAML)
+        for (key in bukkit.getKeys(true)) {
+            config.set(key, bukkit.get(key))
         }
+
+        return config
     }
 
+    override fun createConfig(values: Map<String, Any>, type: ConfigType): Config =
+        EcoConfigSection(type, values)
+
+    override fun createConfig(contents: String, type: ConfigType): Config =
+        EcoConfigSection(type, type.toMap(contents))
+
     override fun createLoadableConfig(
         configName: String,
         plugin: PluginLike,
         subDirectoryPath: String,
         source: Class<*>,
-        type: ConfigType
-    ): LoadableConfig {
-        return if (type == ConfigType.JSON) {
-            EcoLoadableJSONConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source
-            )
-        } else {
-            EcoLoadableYamlConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source
-            )
-        }
-    }
+        type: ConfigType,
+        requiresChangesToSave: Boolean
+    ): LoadableConfig = EcoLoadableConfig(
+        type,
+        configName,
+        plugin,
+        subDirectoryPath,
+        source,
+        requiresChangesToSave
+    )
 
     override fun createUpdatableConfig(
         configName: String,
@@ -68,26 +46,16 @@ object EcoConfigFactory : ConfigFactory {
         source: Class<*>,
         removeUnused: Boolean,
         type: ConfigType,
+        requiresChangesToSave: Boolean,
         vararg updateBlacklist: String
-    ): LoadableConfig {
-        return if (type == ConfigType.JSON) {
-            EcoUpdatableJSONConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source,
-                removeUnused,
-                *updateBlacklist
-            )
-        } else {
-            EcoUpdatableYamlConfig(
-                configName,
-                plugin,
-                subDirectoryPath,
-                source,
-                removeUnused,
-                *updateBlacklist
-            )
-        }
-    }
-}
+    ): LoadableConfig = EcoUpdatableConfig(
+        type,
+        configName,
+        plugin,
+        subDirectoryPath,
+        source,
+        removeUnused,
+        requiresChangesToSave,
+        *updateBlacklist
+    )
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigHandler.kt

@@ -1,14 +1,9 @@
-package com.willfp.eco.internal.config.updating
+package com.willfp.eco.internal.config
 
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.core.config.interfaces.LoadableConfig
 import com.willfp.eco.core.config.updating.ConfigHandler
 import com.willfp.eco.core.config.updating.ConfigUpdater
-import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
-import com.willfp.eco.internal.config.json.EcoUpdatableJSONConfig
-import com.willfp.eco.internal.config.updating.exceptions.InvalidUpdateMethodException
-import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
-import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
 import org.reflections.Reflections
 import org.reflections.scanners.MethodAnnotationsScanner
 
@@ -24,7 +19,7 @@ class EcoConfigHandler(
 
     override fun callUpdate() {
         for (method in reflections.getMethodsAnnotatedWith(ConfigUpdater::class.java)) {
-            kotlin.runCatching {
+            runCatching {
                 when (method.parameterCount) {
                     0 -> method.invoke(null)
                     1 -> method.invoke(null, this.plugin)
@@ -50,11 +45,11 @@ class EcoConfigHandler(
     override fun updateConfigs() {
         for (config in configs) {
             when (config) {
-                is EcoUpdatableYamlConfig -> config.update()
-                is EcoUpdatableJSONConfig -> config.update()
-                is EcoLoadableYamlConfig -> config.reloadFromFile()
-                is EcoLoadableJSONConfig -> config.reloadFromFile()
+                is EcoUpdatableConfig -> config.update()
+                is EcoLoadableConfig -> config.reloadFromFile()
             }
         }
     }
-}
+}
+
+class InvalidUpdateMethodException(message: String) : RuntimeException(message)

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigSection.kt

@@ -0,0 +1,16 @@
+package com.willfp.eco.internal.config
+
+import com.willfp.eco.core.config.ConfigType
+import com.willfp.eco.core.placeholder.StaticPlaceholder
+
+@Suppress("UNCHECKED_CAST")
+class EcoConfigSection(
+    type: ConfigType,
+    values: Map<String, Any?> = emptyMap(),
+    injections: Collection<StaticPlaceholder> = emptyList()
+) : EcoConfig(type) {
+    init {
+        this.init(values)
+        this.injections = injections.toMutableList()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoGsonSerializer.kt

@@ -0,0 +1,20 @@
+package com.willfp.eco.internal.config
+
+import com.google.gson.GsonBuilder
+import com.google.gson.JsonElement
+import com.google.gson.JsonSerializationContext
+import com.google.gson.JsonSerializer
+import com.willfp.eco.core.config.interfaces.Config
+import java.lang.reflect.Type
+
+object EcoGsonSerializer : JsonSerializer<Config> {
+    val gson = GsonBuilder()
+        .setPrettyPrinting()
+        .disableHtmlEscaping()
+        .registerTypeAdapter(Config::class.java, this)
+        .create()
+
+    override fun serialize(src: Config, typeOfSrc: Type, context: JsonSerializationContext): JsonElement {
+        return gson.toJsonTree(src.toMap())
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoLoadableConfig.kt

@@ -1,27 +1,31 @@
-package com.willfp.eco.internal.config.json
+package com.willfp.eco.internal.config
 
 import com.willfp.eco.core.PluginLike
+import com.willfp.eco.core.config.ConfigType
 import com.willfp.eco.core.config.interfaces.LoadableConfig
-import org.bukkit.configuration.file.YamlConfiguration
 import java.io.File
-import java.io.FileNotFoundException
+import java.io.FileInputStream
 import java.io.FileOutputStream
-import java.io.FileReader
 import java.io.IOException
+import java.io.InputStreamReader
 import java.io.OutputStream
+import java.io.Reader
 import java.nio.file.Files
 import java.nio.file.StandardOpenOption
 
 @Suppress("UNCHECKED_CAST")
-open class EcoLoadableJSONConfig(
+open class EcoLoadableConfig(
+    type: ConfigType,
     configName: String,
     private val plugin: PluginLike,
     private val subDirectoryPath: String,
-    val source: Class<*>
-) : EcoJSONConfigWrapper(), LoadableConfig {
-
+    val source: Class<*>,
+    private val requiresChangesToSave: Boolean
+) : EcoConfig(type), LoadableConfig {
     private val configFile: File
-    private val name: String = "$configName.json"
+    private val name: String = "$configName.${type.extension}"
+    private var hasChanged = false
+    private val header = mutableListOf<String>()
 
     fun reloadFromFile() {
         runCatching { init(configFile) }.onFailure { it.printStackTrace() }
@@ -54,19 +58,68 @@ open class EcoLoadableJSONConfig(
 
     @Throws(IOException::class)
     override fun save() {
+        if (requiresChangesToSave) {
+            if (!hasChanged) { // In order to preserve comments
+                return
+            }
+        }
+
         if (configFile.delete()) {
             Files.write(
                 configFile.toPath(),
-                toPlaintext().toByteArray(),
+                this.toPlaintext().toByteArray(),
                 StandardOpenOption.CREATE,
                 StandardOpenOption.WRITE
             )
         }
     }
 
-    @Throws(FileNotFoundException::class)
+    private fun makeHeader(contents: String) {
+        header.clear()
+
+        if (this.type == ConfigType.YAML) {
+            for (line in contents.lines()) {
+                if (!line.startsWith("#")) {
+                    break
+                }
+
+                header.add(line)
+            }
+        }
+    }
+
+    protected fun init(reader: Reader) {
+        val string = reader.readToString()
+        makeHeader(string)
+        super.init(type.toMap(string))
+    }
+
     fun init(file: File) {
-        super.init(gson.fromJson(FileReader(file), Map::class.java) as MutableMap<String, Any>)
+        init(InputStreamReader(FileInputStream(file), Charsets.UTF_8))
+    }
+
+    override fun toPlaintext(): String {
+        val contents = StringBuilder()
+
+        if (this.type == ConfigType.YAML) {
+            for (s in header) {
+                contents.append(s + "\n")
+            }
+
+            if (header.isNotEmpty()) {
+                contents.append("\n")
+            }
+        }
+
+        for (line in super.toPlaintext().lines()) {
+            if (line.startsWith("#")) {
+                continue
+            }
+
+            contents.append(line + "\n")
+        }
+
+        return contents.toString()
     }
 
     override fun getName(): String {
@@ -77,8 +130,9 @@ open class EcoLoadableJSONConfig(
         return configFile
     }
 
-    override fun getBukkitHandle(): YamlConfiguration? {
-        return null
+    override fun set(path: String, obj: Any?) {
+        hasChanged = true
+        super.set(path, obj)
     }
 
     init {
@@ -93,4 +147,4 @@ open class EcoLoadableJSONConfig(
         init(configFile)
         plugin.configHandler.addConfig(this)
     }
-}
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoRepresenter.kt

@@ -0,0 +1,21 @@
+package com.willfp.eco.internal.config
+
+import com.willfp.eco.core.config.interfaces.Config
+import org.yaml.snakeyaml.nodes.Node
+import org.yaml.snakeyaml.representer.Represent
+import org.yaml.snakeyaml.representer.Representer
+
+class EcoRepresenter : Representer() {
+    init {
+        multiRepresenters[Config::class.java] = RepresentConfig(multiRepresenters[Map::class.java]!!)
+    }
+
+    private class RepresentConfig(
+        val handle: Represent
+    ) : Represent {
+        override fun representData(data: Any): Node {
+            data as Config
+            return handle.representData(data.toMap())
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoUpdatableConfig.kt

@@ -1,24 +1,25 @@
-package com.willfp.eco.internal.config.json
+package com.willfp.eco.internal.config
 
 import com.willfp.eco.core.PluginLike
-import org.bukkit.configuration.file.YamlConfiguration
+import com.willfp.eco.core.config.ConfigType
+import com.willfp.eco.core.config.interfaces.Config
 import java.io.BufferedReader
 import java.io.InputStreamReader
 import java.nio.charset.StandardCharsets
 
-open class EcoUpdatableJSONConfig(
+open class EcoUpdatableConfig(
+    type: ConfigType,
     configName: String,
     plugin: PluginLike,
     subDirectoryPath: String,
     source: Class<*>,
     private val removeUnused: Boolean,
+    requiresChangesToSave: Boolean,
     vararg updateBlacklist: String
-) : EcoLoadableJSONConfig(configName, plugin, subDirectoryPath, source) {
-
-    private val updateBlacklist: MutableList<String> = mutableListOf(*updateBlacklist)
+) : EcoLoadableConfig(type, configName, plugin, subDirectoryPath, source, requiresChangesToSave) {
+    private val updateBlacklist = mutableListOf(*updateBlacklist)
 
     fun update() {
-        super.clearCache()
         this.init(configFile)
         val newConfig = configInJar ?: return
         if (newConfig.getKeys(true) == this.getKeys(true)) {
@@ -43,13 +44,14 @@ open class EcoUpdatableJSONConfig(
         this.save()
     }
 
-    private val configInJar: YamlConfiguration?
+    private val configInJar: Config?
         get() {
             val newIn = this.source.getResourceAsStream(resourcePath) ?: return null
             val reader = BufferedReader(InputStreamReader(newIn, StandardCharsets.UTF_8))
-            val newConfig = YamlConfiguration()
-            newConfig.load(reader)
-            return newConfig
+
+            val config = EcoConfigSection(type, emptyMap())
+            config.init(type.toMap(reader.readToString()))
+            return config
         }
 
     init {
@@ -57,4 +59,4 @@ open class EcoUpdatableJSONConfig(
         plugin.configHandler.addConfig(this)
         update()
     }
-}
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigSection.kt

@@ -1,8 +0,0 @@
-package com.willfp.eco.internal.config.json
-
-@Suppress("UNCHECKED_CAST")
-class EcoJSONConfigSection(values: Map<String, Any?>) : EcoJSONConfigWrapper() {
-    init {
-        init(values)
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt

@@ -1,216 +0,0 @@
-@file:Suppress("DEPRECATION")
-
-package com.willfp.eco.internal.config.json
-
-import com.google.gson.Gson
-import com.google.gson.GsonBuilder
-import com.willfp.eco.core.config.ConfigType
-import com.willfp.eco.core.config.interfaces.JSONConfig
-import com.willfp.eco.util.StringUtils
-import java.util.Objects
-import java.util.concurrent.ConcurrentHashMap
-
-@Suppress("UNCHECKED_CAST")
-open class EcoJSONConfigWrapper : JSONConfig {
-    companion object {
-        val gson: Gson = GsonBuilder()
-            .setPrettyPrinting()
-            .disableHtmlEscaping()
-            .create()
-    }
-
-    val values = ConcurrentHashMap<String, Any?>()
-
-    private val cache = ConcurrentHashMap<String, Any>()
-
-    fun init(values: Map<String, Any?>) {
-        this.values.clear()
-        this.values.putAll(values)
-    }
-
-    override fun clearCache() {
-        cache.clear()
-    }
-
-    override fun toPlaintext(): String {
-        return gson.toJson(this.values)
-    }
-
-    override fun has(path: String): Boolean {
-        return getOfKnownType(path, Any::class.java) != null
-    }
-
-    private fun <T : Any?> getOfKnownType(
-        path: String,
-        clazz: Class<T>
-    ): T? {
-        return getOfKnownType(path, clazz, true)
-    }
-
-    protected fun <T> getOfKnownType(
-        path: String,
-        clazz: Class<T>,
-        isBase: Boolean
-    ): T? {
-        var closestPath = path
-        if (cache.containsKey(path) && isBase) {
-            return cache[path] as T?
-        }
-        if (path.contains(".")) {
-            val split = path.split("\\.".toRegex()).toTypedArray()
-            closestPath = split[0]
-        }
-        return if (values[closestPath] is Map<*, *> && path != closestPath) {
-            val section =
-                EcoJSONConfigSection((values[closestPath] as Map<String, Any?>?)!!)
-            section.getOfKnownType(path.substring(closestPath.length + 1), clazz, false)
-        } else {
-            if (values.containsKey(closestPath)) {
-                values[closestPath] as T?
-            } else {
-                null
-            }
-        }
-    }
-
-    override fun getKeys(deep: Boolean): List<String> {
-        return if (deep) {
-            ArrayList(getDeepKeys(HashSet(), ""))
-        } else {
-            ArrayList(values.keys)
-        }
-    }
-
-    protected fun getDeepKeys(
-        list: MutableSet<String>,
-        root: String
-    ): Set<String> {
-        for (key in values.keys) {
-            list.add(root + key)
-            if (values[key] is Map<*, *>) {
-                val section = EcoJSONConfigSection((values[key] as Map<String, Any?>?)!!)
-                list.addAll(section.getDeepKeys(list, "$root$key."))
-            }
-        }
-        return list
-    }
-
-    override fun get(path: String): Any? {
-        return getOfKnownType(path, Any::class.java)
-    }
-
-    override fun set(
-        path: String,
-        `object`: Any?
-    ) {
-        setRecursively(path, `object`)
-        clearCache()
-    }
-
-    protected fun setRecursively(
-        path: String,
-        obj: Any?
-    ) {
-        var closestPath = path
-        if (path.contains(".")) {
-            val split = path.split("\\.".toRegex()).toTypedArray()
-            closestPath = split[0]
-        }
-        if (values[closestPath] is Map<*, *> && path != closestPath) {
-            val section = EcoJSONConfigSection((values[closestPath] as Map<String, Any?>?)!!)
-            section.setRecursively(path.substring(closestPath.length + 1), obj)
-            values[closestPath] = section.values
-        } else {
-            var ob = obj
-            if (ob is JSONConfig) {
-                ob = (obj as EcoJSONConfigWrapper).values
-            }
-            values[path] = ob
-        }
-    }
-
-    override fun getSubsection(path: String): JSONConfig {
-        return getSubsectionOrNull(path) ?: EcoJSONConfigSection(mutableMapOf())
-    }
-
-    override fun getSubsectionOrNull(path: String): JSONConfig? {
-        return if (values.containsKey(path)) {
-            val subsection = values[path] as Map<String, Any>
-            EcoJSONConfigSection(subsection)
-        } else {
-            null
-        }
-    }
-
-    override fun getSubsectionsOrNull(path: String): List<JSONConfig>? {
-        val maps = getOfKnownType(path, Any::class.java) as List<Map<String, Any>>?
-            ?: return null
-        val configs = mutableListOf<JSONConfig>()
-        for (map in maps) {
-            configs.add(EcoJSONConfigSection(map))
-        }
-        return configs.toMutableList()
-    }
-
-    override fun getIntOrNull(path: String): Int? {
-        return getOfKnownType(path, Double::class.java)?.toInt()
-    }
-
-    override fun getIntsOrNull(path: String): MutableList<Int>? {
-        return (getOfKnownType(path, Any::class.java) as Collection<Int>?)?.toMutableList()
-    }
-
-    override fun getBoolOrNull(path: String): Boolean? {
-        return getOfKnownType(path, Boolean::class.java)
-    }
-
-    override fun getBoolsOrNull(path: String): MutableList<Boolean>? {
-        return (getOfKnownType(path, Any::class.java) as Collection<Boolean>?)?.toMutableList()
-    }
-
-    override fun getStringOrNull(
-        path: String,
-        format: Boolean,
-        option: StringUtils.FormatOption
-    ): String? {
-        return if (has(path)) {
-            val string = getOfKnownType(path, String::class.java) ?: ""
-            return if (format) StringUtils.format(string, option) else string
-        } else {
-            null
-        }
-    }
-
-    override fun getStringsOrNull(
-        path: String,
-        format: Boolean,
-        option: StringUtils.FormatOption
-    ): MutableList<String>? {
-        return if (has(path)) {
-            val strings =
-                (Objects.requireNonNullElse(
-                    getOfKnownType(path, Any::class.java),
-                    emptyList<String>()
-                ) as List<String>).toMutableList()
-            return if (format) StringUtils.formatList(strings, option) else strings
-        } else {
-            null
-        }
-    }
-
-    override fun getDoubleOrNull(path: String): Double? {
-        return getOfKnownType(path, Double::class.java)
-    }
-
-    override fun getDoublesOrNull(path: String): MutableList<Double>? {
-        return (getOfKnownType(path, Any::class.java) as Collection<Double>?)?.toMutableList()
-    }
-
-    override fun getType(): ConfigType {
-        return ConfigType.JSON
-    }
-
-    override fun clone(): JSONConfig {
-        return EcoJSONConfigSection(this.values.toMutableMap())
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/updating/exceptions/InvalidUpdateMethodException.kt

@@ -1,3 +0,0 @@
-package com.willfp.eco.internal.config.updating.exceptions
-
-class InvalidUpdateMethodException(message: String) : RuntimeException(message)

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoLoadableYamlConfig.kt

@@ -1,82 +0,0 @@
-@file:Suppress("DEPRECATION")
-
-package com.willfp.eco.internal.config.yaml
-
-import com.willfp.eco.core.PluginLike
-import com.willfp.eco.core.config.interfaces.LoadableConfig
-import com.willfp.eco.core.config.interfaces.WrappedYamlConfiguration
-import org.bukkit.configuration.file.YamlConfiguration
-import java.io.File
-import java.io.FileOutputStream
-import java.io.IOException
-import java.io.OutputStream
-
-open class EcoLoadableYamlConfig(
-    configName: String,
-    private val plugin: PluginLike,
-    private val subDirectoryPath: String,
-    val source: Class<*>
-) : EcoYamlConfigWrapper<YamlConfiguration>(), WrappedYamlConfiguration, LoadableConfig {
-
-    private val configFile: File
-    private val name: String = "$configName.yml"
-
-    fun reloadFromFile() {
-        handle.load(getConfigFile())
-    }
-
-    final override fun createFile() {
-        val inputStream = source.getResourceAsStream(resourcePath)!!
-        val outFile = File(this.plugin.dataFolder, resourcePath)
-        val lastIndex = resourcePath.lastIndexOf('/')
-        val outDir = File(this.plugin.dataFolder, resourcePath.substring(0, lastIndex.coerceAtLeast(0)))
-        if (!outDir.exists()) {
-            outDir.mkdirs()
-        }
-        if (!outFile.exists()) {
-            val out: OutputStream = FileOutputStream(outFile)
-            inputStream.copyTo(out)
-            out.close()
-            inputStream.close()
-        }
-    }
-
-    override fun getResourcePath(): String {
-        val resourcePath: String = if (subDirectoryPath.isEmpty()) {
-            name
-        } else {
-            subDirectoryPath + name
-        }
-        return "/$resourcePath"
-    }
-
-    @Throws(IOException::class)
-    override fun save() {
-        handle.save(getConfigFile())
-    }
-
-    override fun getName(): String {
-        return name
-    }
-
-    override fun getConfigFile(): File {
-        return configFile
-    }
-
-    override fun getBukkitHandle(): YamlConfiguration? {
-        return handle
-    }
-
-    init {
-        val directory = File(this.plugin.dataFolder, subDirectoryPath)
-        if (!directory.exists()) {
-            directory.mkdirs()
-        }
-        if (!File(directory, name).exists()) {
-            createFile()
-        }
-        configFile = File(directory, name)
-        this.plugin.configHandler.addConfig(this)
-        init(YamlConfiguration.loadConfiguration(configFile))
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoUpdatableYamlConfig.kt

@@ -1,60 +0,0 @@
-package com.willfp.eco.internal.config.yaml
-
-import com.willfp.eco.core.PluginLike
-import org.bukkit.configuration.file.YamlConfiguration
-import java.io.BufferedReader
-import java.io.InputStreamReader
-import java.nio.charset.StandardCharsets
-
-class EcoUpdatableYamlConfig(
-    configName: String,
-    plugin: PluginLike,
-    subDirectoryPath: String,
-    source: Class<*>,
-    private val removeUnused: Boolean,
-    vararg updateBlacklist: String
-) : EcoLoadableYamlConfig(configName, plugin, subDirectoryPath, source) {
-
-    private val updateBlacklist: MutableList<String> = mutableListOf(*updateBlacklist)
-
-    fun update() {
-        super.clearCache()
-        this.handle.load(configFile)
-        val newConfig = configInJar ?: return
-        if (newConfig.getKeys(true) == this.handle.getKeys(true)) {
-            return
-        }
-        newConfig.getKeys(true).forEach { key ->
-            if (!this.handle.getKeys(true).contains(key)) {
-                if (updateBlacklist.stream().noneMatch { key.contains(it) }) {
-                    this.handle.set(key, newConfig[key])
-                }
-            }
-        }
-        if (removeUnused) {
-            this.handle.getKeys(true).forEach { s ->
-                if (!newConfig.getKeys(true).contains(s)) {
-                    if (updateBlacklist.stream().noneMatch(s::contains)) {
-                        this.handle.set(s, null)
-                    }
-                }
-            }
-        }
-        this.handle.save(configFile)
-    }
-
-    private val configInJar: YamlConfiguration?
-        get() {
-            val newIn = source.getResourceAsStream(resourcePath) ?: return null
-            val reader = BufferedReader(InputStreamReader(newIn, StandardCharsets.UTF_8))
-            val newConfig = YamlConfiguration()
-            newConfig.load(reader)
-            return newConfig
-        }
-
-    init {
-        this.updateBlacklist.removeIf { it.isEmpty() }
-        plugin.configHandler.addConfig(this)
-        update()
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigSection.kt

@@ -1,9 +0,0 @@
-package com.willfp.eco.internal.config.yaml
-
-import org.bukkit.configuration.ConfigurationSection
-
-class EcoYamlConfigSection(section: ConfigurationSection) : EcoYamlConfigWrapper<ConfigurationSection>() {
-    init {
-        init(section)
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt

@@ -1,241 +0,0 @@
-package com.willfp.eco.internal.config.yaml
-
-import com.willfp.eco.core.config.ConfigType
-import com.willfp.eco.core.config.interfaces.Config
-import com.willfp.eco.util.StringUtils
-import org.bukkit.configuration.ConfigurationSection
-import org.bukkit.configuration.file.YamlConfiguration
-import java.io.StringReader
-
-@Suppress("UNCHECKED_CAST")
-open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
-    lateinit var handle: T
-    private val cache = mutableMapOf<String, Any?>()
-
-    protected fun init(config: T): Config {
-        handle = config
-        return this
-    }
-
-    override fun toPlaintext(): String {
-        val temp = YamlConfiguration()
-        for (key in handle.getKeys(true)) {
-            temp[key] = handle[key]
-        }
-        return temp.saveToString()
-    }
-
-    override fun clearCache() {
-        cache.clear()
-    }
-
-    override fun has(path: String): Boolean {
-        return handle.contains(path)
-    }
-
-    override fun getKeys(deep: Boolean): List<String> {
-        return ArrayList(handle.getKeys(deep))
-    }
-
-    override fun get(path: String): Any? {
-        return handle[path]
-    }
-
-    override fun set(
-        path: String,
-        obj: Any?
-    ) {
-        cache.remove(path)
-        handle[path] = obj
-    }
-
-    override fun getSubsectionOrNull(path: String): Config? {
-        return if (cache.containsKey(path)) {
-            cache[path] as Config?
-        } else {
-            val raw = handle.getConfigurationSection(path)
-            if (raw == null) {
-                cache[path] = null
-            } else {
-                cache[path] = EcoYamlConfigSection(raw)
-            }
-            getSubsectionOrNull(path)
-        }
-    }
-
-    override fun getIntOrNull(path: String): Int? {
-        return if (cache.containsKey(path)) {
-            (cache[path] as Number).toInt()
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getDouble(path).toInt()
-            } else {
-                return null
-            }
-            getIntOrNull(path)
-        }
-    }
-
-    override fun getIntsOrNull(path: String): MutableList<Int>? {
-        return if (cache.containsKey(path)) {
-            (cache[path] as Collection<Int>).toMutableList()
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getIntegerList(path).toMutableList()
-            } else {
-                return null
-            }
-            getIntsOrNull(path)
-        }
-    }
-
-    override fun getBoolOrNull(path: String): Boolean? {
-        return if (cache.containsKey(path)) {
-            cache[path] as Boolean
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getBoolean(path)
-            } else {
-                return null
-            }
-            getBoolOrNull(path)
-        }
-    }
-
-    override fun getBoolsOrNull(path: String): MutableList<Boolean>? {
-        return if (cache.containsKey(path)) {
-            (cache[path] as Collection<Boolean>).toMutableList()
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getBooleanList(path).toMutableList()
-            } else {
-                return null
-            }
-            getBoolsOrNull(path)
-        }
-    }
-
-    override fun getStringOrNull(
-        path: String,
-        format: Boolean,
-        option: StringUtils.FormatOption
-    ): String? {
-        return if (has(path)) {
-            if (format && option == StringUtils.FormatOption.WITHOUT_PLACEHOLDERS) {
-                return if (cache.containsKey("$path\$FMT")) {
-                    cache["$path\$FMT"] as String
-                } else {
-                    val string: String = handle.getString(path, "")!!
-                    cache["$path\$FMT"] = StringUtils.format(string, option)
-                    getString(path, format, option)
-                }
-            } else {
-                val string = if (cache.containsKey(path)) {
-                    cache[path] as String
-                } else {
-                    cache[path] = handle.getString(path, "")!!
-                    getString(path, format, option)
-                }
-
-                return if (format) StringUtils.format(string) else string
-            }
-        } else {
-            null
-        }
-    }
-
-    override fun getStringsOrNull(
-        path: String,
-        format: Boolean,
-        option: StringUtils.FormatOption
-    ): MutableList<String>? {
-        return if (has(path)) {
-            if (format && option == StringUtils.FormatOption.WITHOUT_PLACEHOLDERS) {
-                return if (cache.containsKey("$path\$FMT")) {
-                    (cache["$path\$FMT"] as MutableList<String>).toMutableList()
-                } else {
-                    val list = if (has(path)) handle.getStringList(path) else mutableListOf<String>()
-                    cache["$path\$FMT"] = StringUtils.formatList(list, option)
-                    getStrings(path, true, option)
-                }
-            } else {
-                val strings = if (cache.containsKey(path)) {
-                    (cache[path] as MutableList<String>).toMutableList()
-                } else {
-                    cache[path] =
-                        if (has(path)) ArrayList(handle.getStringList(path)) else mutableListOf<String>()
-                    getStrings(path, false, option)
-                }
-
-                return if (format) {
-                    StringUtils.formatList(strings, StringUtils.FormatOption.WITH_PLACEHOLDERS)
-                } else {
-                    strings
-                }
-            }
-        } else {
-            null
-        }
-    }
-
-    override fun getDoubleOrNull(path: String): Double? {
-        return if (cache.containsKey(path)) {
-            (cache[path] as Number).toDouble()
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getDouble(path)
-            } else {
-                return null
-            }
-            getDoubleOrNull(path)
-        }
-    }
-
-    override fun getDoublesOrNull(path: String): MutableList<Double>? {
-        return if (cache.containsKey(path)) {
-            (cache[path] as Collection<Double>).toMutableList()
-        } else {
-            if (has(path)) {
-                cache[path] = handle.getDoubleList(path).toMutableList()
-            } else {
-                return null
-            }
-            getDoublesOrNull(path)
-        }
-    }
-
-    override fun getSubsectionsOrNull(path: String): MutableList<out Config>? {
-        return if (has(path)) {
-            return if (cache.containsKey(path)) {
-                (cache[path] as Collection<Config>).toMutableList()
-            } else {
-                val mapList = ArrayList(handle.getMapList(path)) as List<Map<String, Any?>>
-                val configList = mutableListOf<Config>()
-                for (map in mapList) {
-                    val temp = YamlConfiguration.loadConfiguration(StringReader(""))
-                    temp.createSection("a", map)
-                    configList.add(EcoYamlConfigSection(temp.getConfigurationSection("a")!!))
-                }
-
-                cache[path] = if (has(path)) configList else emptyList()
-                getSubsections(path)
-            }
-        } else {
-            null
-        }
-    }
-
-    override fun getType(): ConfigType {
-        return ConfigType.JSON
-    }
-
-    override fun clone(): Config {
-        return EcoYamlConfigSection(
-            YamlConfiguration.loadConfiguration(
-                StringReader(
-                    toPlaintext()
-                )
-            )
-        )
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/EcoMenu.kt

@@ -4,7 +4,6 @@ import com.willfp.eco.core.gui.menu.CloseHandler
 import com.willfp.eco.core.gui.menu.Menu
 import com.willfp.eco.core.gui.slot.Slot
 import com.willfp.eco.internal.gui.slot.EcoSlot
-import com.willfp.eco.util.StringUtils
 import org.bukkit.Bukkit
 import org.bukkit.NamespacedKey
 import org.bukkit.entity.Player
@@ -19,7 +18,7 @@ class EcoMenu(
     val slots: List<MutableList<EcoSlot>>,
     private val title: String,
     private val onClose: CloseHandler
-): Menu {
+) : Menu {
     override fun getSlot(row: Int, column: Int): Slot {
         if (row < 1 || row > this.rows) {
             return slots[0][0]
@@ -37,33 +36,23 @@ class EcoMenu(
 
         var i = 0
         for (row in slots) {
-            for (item in row) {
+            for (slot in row) {
                 if (i == rows * 9) {
                     break
                 }
-                val slotItem = item.getItemStack(player, this)
-                val meta = slotItem.itemMeta
-                if (meta != null) {
-                    val lore = meta.lore
-                    if (lore != null) {
-                        lore.replaceAll{ s -> StringUtils.format(s, player) }
-                        meta.lore = lore
-                    }
-                    slotItem.itemMeta = meta
-                }
-                inventory.setItem(i, slotItem)
+                inventory.setItem(i, slot.getItemStack(player, this))
                 i++
             }
         }
 
         player.openInventory(inventory)
-        MenuHandler.registerMenu(inventory, this)
+        MenuHandler.registerInventory(inventory, this, player)
         return inventory
     }
 
     fun handleClose(event: InventoryCloseEvent) {
         onClose.handle(event, this)
-        MenuHandler.unregisterMenu(event.inventory)
+        MenuHandler.unregisterInventory(event.inventory)
     }
 
     override fun getRows(): Int {
@@ -74,9 +63,8 @@ class EcoMenu(
         return title
     }
 
-    override fun getCaptiveItems(player: Player): MutableList<ItemStack> {
-        val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
-        inventory ?: return mutableListOf()
+    override fun getCaptiveItems(player: Player): List<ItemStack> {
+        val inventory = player.openInventory.topInventory.asRenderedInventory() ?: return emptyList()
         return inventory.captiveItems
     }
 
@@ -86,21 +74,22 @@ class EcoMenu(
         type: PersistentDataType<T, Z>,
         value: Z
     ) {
-        val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
-        inventory ?: return
+        val inventory = player.openInventory.topInventory.asRenderedInventory() ?: return
         inventory.data[key] = value
-        inventory.refresh(player)
+        inventory.render()
     }
 
     override fun <T : Any, Z : Any> readData(player: Player, key: NamespacedKey, type: PersistentDataType<T, Z>): T? {
-        val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
-        inventory ?: return null
-        return inventory.data[key] as T?
+        val inventory = player.openInventory.topInventory.asRenderedInventory() ?: return null
+        return inventory.data[key] as? T?
     }
 
-    override fun getKeys(player: Player): MutableSet<NamespacedKey> {
-        val inventory = MenuHandler.getExtendedInventory(player.openInventory.topInventory)
-        inventory ?: return HashSet()
+    override fun getKeys(player: Player): Set<NamespacedKey> {
+        val inventory = player.openInventory.topInventory.asRenderedInventory() ?: return emptySet()
         return inventory.data.keys
     }
-}
+
+    override fun refresh(player: Player) {
+        player.openInventory.topInventory.asRenderedInventory()?.render()
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuHandler.kt

@@ -1,32 +1,29 @@
 package com.willfp.eco.internal.gui.menu
 
 import com.willfp.eco.core.gui.menu.Menu
+import org.bukkit.entity.Player
 import org.bukkit.inventory.Inventory
 import java.util.WeakHashMap
 
-object MenuHandler {
-    private val menus = WeakHashMap<ExtendedInventory, EcoMenu>()
-    private val inventories = WeakHashMap<Inventory, ExtendedInventory>()
+private val inventories = WeakHashMap<Inventory, MenuRenderedInventory>()
 
-    fun registerMenu(
+object MenuHandler {
+    fun registerInventory(
         inventory: Inventory,
-        menu: EcoMenu
+        menu: EcoMenu,
+        player: Player
     ) {
-        val extendedInventory = ExtendedInventory(inventory, menu)
-        inventories[inventory] = extendedInventory
-        menus[extendedInventory] = menu
+        val rendered = MenuRenderedInventory(menu, inventory, player)
+        inventories[inventory] = rendered
     }
 
-    fun unregisterMenu(inventory: Inventory) {
-        menus.remove(inventories[inventory])
+    fun unregisterInventory(inventory: Inventory) {
         inventories.remove(inventory)
     }
+}
 
-    fun getMenu(inventory: Inventory): Menu? {
-        return menus[inventories[inventory]]
-    }
+fun Inventory.asRenderedInventory(): MenuRenderedInventory? =
+    inventories[this]
 
-    fun getExtendedInventory(inventory: Inventory): ExtendedInventory? {
-        return inventories[inventory]
-    }
-}
+fun Inventory.getMenu(): Menu? =
+    this.asRenderedInventory()?.menu

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/MenuRenderedInventory.kt

@@ -1,35 +1,21 @@
 package com.willfp.eco.internal.gui.menu
 
 import com.willfp.eco.util.MenuUtils
-import com.willfp.eco.util.StringUtils
-import org.bukkit.Material
 import org.bukkit.NamespacedKey
 import org.bukkit.entity.Player
 import org.bukkit.inventory.Inventory
 import org.bukkit.inventory.ItemStack
 
-class ExtendedInventory(
+class MenuRenderedInventory(
+    val menu: EcoMenu,
     val inventory: Inventory,
-    private val menu: EcoMenu
+    val player: Player
 ) {
     val captiveItems = mutableListOf<ItemStack>()
     val data = mutableMapOf<NamespacedKey, Any>()
 
-    fun refresh(player: Player) {
-        captiveItems.clear()
-        for (i in 0 until inventory.size) {
-            val (row, column) = MenuUtils.convertSlotToRowColumn(i)
-            val slot = menu.getSlot(row, column)
-            if (slot.isCaptive) {
-                val defaultItem = slot.getItemStack(player)
-                val item = inventory.getItem(i) ?: continue
-                if (item == defaultItem && item.type == Material.AIR) {
-                    continue
-                }
-
-                captiveItems.add(item)
-            }
-        }
+    fun render() {
+        generateCaptive()
 
         var i = 0
         for (row in menu.slots) {
@@ -37,21 +23,31 @@ class ExtendedInventory(
                 if (i == menu.rows * 9) {
                     break
                 }
-                val slotItem = slot.getItemStack(player, menu)
-                val meta = slotItem.itemMeta
-                if (meta != null) {
-                    val lore = meta.lore
-                    if (lore != null) {
-                        lore.replaceAll{ s -> StringUtils.format(s, player) }
-                        meta.lore = lore
-                    }
-                    slotItem.itemMeta = meta
-                }
+
                 if (!slot.isCaptive) {
-                    inventory.setItem(i, slotItem)
+                    inventory.setItem(i, slot.getItemStack(player, menu))
                 }
+
                 i++
             }
         }
     }
-}
+
+    private fun generateCaptive() {
+        captiveItems.clear()
+        for (i in 0 until inventory.size) {
+            val (row, column) = MenuUtils.convertSlotToRowColumn(i)
+            val slot = menu.getSlot(row, column)
+            if (slot.isCaptive) {
+                val renderedItem = slot.getItemStack(player)
+                val itemStack = inventory.getItem(i) ?: continue
+
+                if (itemStack == renderedItem || itemStack.type.isAir || itemStack.amount == 0) {
+                    continue
+                }
+
+                captiveItems.add(itemStack)
+            }
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt

@@ -5,7 +5,8 @@ import com.willfp.eco.core.gui.slot.Slot
 import com.willfp.eco.core.gui.slot.functional.SlotHandler
 import com.willfp.eco.core.gui.slot.functional.SlotProvider
 import com.willfp.eco.core.gui.slot.functional.SlotUpdater
-import com.willfp.eco.internal.gui.menu.MenuHandler
+import com.willfp.eco.internal.gui.menu.getMenu
+import org.bukkit.Material
 import org.bukkit.entity.Player
 import org.bukkit.event.inventory.ClickType
 import org.bukkit.event.inventory.InventoryClickEvent
@@ -20,11 +21,12 @@ open class EcoSlot(
     private val onMiddleClick: SlotHandler,
     private val updater: SlotUpdater
 ) : Slot {
-
     fun handleInventoryClick(
         event: InventoryClickEvent,
         menu: Menu
     ) {
+        event.isCancelled = true
+
         when (event.click) {
             ClickType.LEFT -> this.onLeftClick.handle(event, this, menu)
             ClickType.RIGHT -> this.onRightClick.handle(event, this, menu)
@@ -36,9 +38,9 @@ open class EcoSlot(
     }
 
     override fun getItemStack(player: Player): ItemStack {
-        val menu = MenuHandler.getMenu(player.openInventory.topInventory)!!
+        val menu = player.openInventory.topInventory.getMenu()!!
         val prev = provider.provide(player, menu)
-        return updater.update(player, menu, prev)
+        return updater.update(player, menu, prev) ?: ItemStack(Material.AIR)
     }
 
     fun getItemStack(
@@ -46,7 +48,8 @@ open class EcoSlot(
         menu: Menu
     ): ItemStack {
         val prev = provider.provide(player, menu)
-        return updater.update(player, menu, prev)
+        val updated = updater.update(player, menu, prev)
+        return updated ?: ItemStack(Material.AIR)
     }
 
     override fun isCaptive(): Boolean {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserColor.kt

@@ -41,4 +41,12 @@ class ArgParserColor : LookupArgParser {
             )
         }
     }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (meta !is LeatherArmorMeta) {
+            return null
+        }
+
+        return "color:#${Integer.toHexString(meta.color.asRGB())}"
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserCustomModelData.kt

@@ -30,4 +30,12 @@ class ArgParserCustomModelData : LookupArgParser {
             testMeta.customModelData == modelData
         }
     }
-}
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (!meta.hasCustomModelData()) {
+            return null
+        }
+
+        return "custom-model-data:${meta.customModelData}"
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserEnchantment.kt

@@ -52,4 +52,26 @@ class ArgParserEnchantment : LookupArgParser {
             true
         }
     }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        val enchants = mutableMapOf<Enchantment, Int>()
+
+        if (meta is EnchantmentStorageMeta) {
+            enchants.putAll(meta.storedEnchants)
+        } else {
+            enchants.putAll(meta.enchants)
+        }
+
+        if (enchants.isEmpty()) {
+            return null
+        }
+
+        val builder = StringBuilder()
+
+        for ((enchant, level) in enchants) {
+            builder.append("${enchant.key.key}:$level ")
+        }
+
+        return builder.toString().trimEnd()
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserFlag.kt

@@ -11,7 +11,7 @@ class ArgParserFlag : LookupArgParser {
         val flags = mutableSetOf<ItemFlag>()
 
         for (arg in args) {
-            val flag = kotlin.runCatching { ItemFlag.valueOf(arg.uppercase()) }.getOrNull() ?: continue
+            val flag = runCatching { ItemFlag.valueOf(arg.uppercase()) }.getOrNull() ?: continue
             flags.add(flag)
         }
 
@@ -27,4 +27,14 @@ class ArgParserFlag : LookupArgParser {
             testMeta.itemFlags.containsAll(flags)
         }
     }
-}
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        val flags = meta.itemFlags
+
+        if (flags.isEmpty()) {
+            return null
+        }
+
+        return flags.joinToString(" ") { it.name.lowercase() }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserName.kt

@@ -30,4 +30,12 @@ class ArgParserName : LookupArgParser {
             testMeta.displayName == formatted
         }
     }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (!meta.hasDisplayName()) {
+            return null
+        }
+
+        return "name:\"${meta.displayName}\""
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserTexture.kt

@@ -36,4 +36,12 @@ class ArgParserTexture : LookupArgParser {
             texture == SkullUtils.getSkullTexture(testMeta)
         }
     }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (meta !is SkullMeta) {
+            return null
+        }
+
+        return "texture:${SkullUtils.getSkullTexture(meta)}"
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserUnbreakable.kt

@@ -27,4 +27,12 @@ class ArgParserUnbreakable : LookupArgParser {
             testMeta.isUnbreakable
         }
     }
+
+    override fun serializeBack(meta: ItemMeta): String? {
+        if (!meta.isUnbreakable) {
+            return null
+        }
+
+        return "unbreakable"
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/logging/EcoLogger.kt

@@ -2,24 +2,17 @@ package com.willfp.eco.internal.logging
 
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.util.StringUtils
+import org.bukkit.Bukkit
 import java.util.logging.Level
 import java.util.logging.Logger
 
-class EcoLogger(plugin: EcoPlugin) : Logger(plugin.name, null as String?) {
+class EcoLogger(private val plugin: EcoPlugin) : Logger(plugin.name, null as String?) {
     override fun info(msg: String) {
-        super.info(StringUtils.format(msg))
-    }
-
-    override fun warning(msg: String) {
-        super.warning(StringUtils.format(msg))
-    }
-
-    override fun severe(msg: String) {
-        super.severe(StringUtils.format(msg))
+        Bukkit.getConsoleSender().sendMessage("[${plugin.name}] ${StringUtils.format(msg)}")
     }
 
     init {
         parent = plugin.server.logger
         this.level = Level.ALL
     }
-}
+}

eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/v1_17_R1/ChatComponent.kt

@@ -62,7 +62,8 @@ class ChatComponent : ChatComponentProxy {
         }
 
         val newShowItem = showItem.nbt(
-            BinaryTagHolder.binaryTagHolder(
+            @Suppress("UnstableApiUsage", "DEPRECATION")
+            BinaryTagHolder.of(
                 CraftItemStack.asNMSCopy(
                     Display.display(
                         CraftItemStack.asBukkitCopy(

eco-core/core-nms/v1_18_R1/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/v1_18_R1/ChatComponent.kt

@@ -62,7 +62,8 @@ class ChatComponent : ChatComponentProxy {
         }
 
         val newShowItem = showItem.nbt(
-            BinaryTagHolder.binaryTagHolder(
+            @Suppress("UnstableApiUsage", "DEPRECATION")
+            BinaryTagHolder.of(
                 CraftItemStack.asNMSCopy(
                     Display.display(
                         CraftItemStack.asBukkitCopy(

eco-core/core-nms/v1_18_R2/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/v1_18_R2/MiniMessageTranslator.kt

@@ -22,8 +22,10 @@ class MiniMessageTranslator : MiniMessageTranslatorProxy {
             ).toLegacy()
         }.getOrNull() ?: mut
 
-        if (startsWithPrefix) {
-            mut = Display.PREFIX + miniMessage
+        mut = if (startsWithPrefix) {
+            Display.PREFIX + miniMessage
+        } else {
+            miniMessage
         }
 
         return mut

eco-core/core-plugin/build.gradle

@@ -2,13 +2,23 @@ group 'com.willfp'
 version rootProject.version
 
 dependencies {
-    implementation 'com.github.Redempt:Crunch:1.0'
-    compileOnly 'net.kyori:adventure-platform-bukkit:4.1.0'
-    compileOnly 'org.apache.maven:maven-artifact:3.8.1'
-    compileOnly 'com.google.code.gson:gson:2.8.8'
-    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
     compileOnly project(":eco-core:core-proxy")
     compileOnly project(":eco-core:core-backend")
+
+    // Libraries
+    implementation 'com.github.Redempt:Crunch:1.1.2'
+    implementation 'mysql:mysql-connector-java:8.0.25'
+    implementation 'org.jetbrains.exposed:exposed-core:0.37.3'
+    implementation 'org.jetbrains.exposed:exposed-dao:0.37.3'
+    implementation 'org.jetbrains.exposed:exposed-jdbc:0.37.3'
+    implementation 'com.zaxxer:HikariCP:5.0.0'
+    implementation 'net.kyori:adventure-platform-bukkit:4.1.0'
+
+    // Included in spigot jar
+    compileOnly 'com.google.code.gson:gson:2.8.8'
+    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
+
+    // Plugin dependencies
     compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT'
     compileOnly 'com.sk89q.worldguard:worldguard-bukkit:7.0.7-SNAPSHOT'
     compileOnly 'com.github.TechFortress:GriefPrevention:16.17.1'
@@ -26,11 +36,6 @@ dependencies {
     compileOnly 'com.github.brcdev-minecraft:shopgui-api:2.2.0'
     compileOnly 'com.github.LoneDev6:API-ItemsAdder:2.4.7'
     compileOnly 'com.arcaniax:HeadDatabase-API:1.3.0'
-    compileOnly 'org.jetbrains.exposed:exposed-core:0.37.3'
-    compileOnly 'org.jetbrains.exposed:exposed-dao:0.37.3'
-    compileOnly 'org.jetbrains.exposed:exposed-jdbc:0.37.3'
-    compileOnly 'mysql:mysql-connector-java:8.0.25'
-    compileOnly 'com.zaxxer:HikariCP:5.0.0'
     compileOnly 'com.gmail.filoghost.holographicdisplays:holographicdisplays-api:2.4.0'
     compileOnly 'com.github.EssentialsX:Essentials:2.18.2'
     compileOnly 'com.bgsoftware:SuperiorSkyblockAPI:1.8.3'
@@ -40,7 +45,10 @@ dependencies {
     compileOnly 'com.github.WhipDevelopment:CrashClaim:f9cd7d92eb'
     compileOnly 'com.wolfyscript.wolfyutilities:wolfyutilities:3.16.0.0'
     compileOnly 'com.github.decentsoftware-eu:decentholograms:2.1.2'
-    compileOnly 'io.lumine.xikage:MythicMobs:4.9.1'
+
+    // MythicMobs
+    compileOnly 'io.lumine:Mythic:5.0.1'
+    compileOnly 'io.lumine:LumineUtils:1.16.1-SNAPSHOT'
 
     // CombatLogX V10 + NewbieHelper Expansion
     compileOnly 'com.SirBlobman.combatlogx:CombatLogX-API:10.0.0.0-SNAPSHOT'
@@ -53,6 +61,7 @@ dependencies {
     // LibsDisguises
     compileOnly 'LibsDisguises:LibsDisguises:10.0.26'
 
+    // All other libs
     compileOnly fileTree(dir: '../../lib', include: ['*.jar'])
 }
 

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/EcoHandler.kt

@@ -10,7 +10,7 @@ import com.willfp.eco.internal.EcoCleaner
 import com.willfp.eco.internal.EcoPropsParser
 import com.willfp.eco.internal.Plugins
 import com.willfp.eco.internal.config.EcoConfigFactory
-import com.willfp.eco.internal.config.updating.EcoConfigHandler
+import com.willfp.eco.internal.config.EcoConfigHandler
 import com.willfp.eco.internal.drops.EcoDropQueueFactory
 import com.willfp.eco.internal.events.EcoEventManager
 import com.willfp.eco.internal.extensions.EcoExtensionLoader

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/EcoSpigotPlugin.kt

@@ -110,10 +110,12 @@ import com.willfp.eco.internal.spigot.math.evaluateExpression
 import com.willfp.eco.internal.spigot.proxy.FastItemStackFactoryProxy
 import com.willfp.eco.internal.spigot.proxy.SkullProxy
 import com.willfp.eco.internal.spigot.proxy.TPSProxy
-import com.willfp.eco.internal.spigot.recipes.ShapedRecipeListener
+import com.willfp.eco.internal.spigot.recipes.CraftingRecipeListener
 import com.willfp.eco.internal.spigot.recipes.StackedRecipeListener
 import com.willfp.eco.internal.spigot.recipes.listeners.ComplexInComplex
 import com.willfp.eco.internal.spigot.recipes.listeners.ComplexInVanilla
+import com.willfp.eco.internal.spigot.recipes.stackhandlers.ShapedCraftingRecipeStackHandler
+import com.willfp.eco.internal.spigot.recipes.stackhandlers.ShapelessCraftingRecipeStackHandler
 import com.willfp.eco.util.NumberUtils
 import com.willfp.eco.util.ServerUtils
 import com.willfp.eco.util.SkullUtils
@@ -156,8 +158,11 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
         Entities.registerArgParser(EntityArgParserSilent())
         Entities.registerArgParser(EntityArgParserEquipment())
 
-        ShapedRecipeListener.registerListener(ComplexInComplex())
-        ShapedRecipeListener.registerListener(ComplexInVanilla())
+        CraftingRecipeListener.registerListener(ComplexInComplex())
+        CraftingRecipeListener.registerListener(ComplexInVanilla())
+
+        StackedRecipeListener.registerHandler(ShapedCraftingRecipeStackHandler())
+        StackedRecipeListener.registerHandler(ShapelessCraftingRecipeStackHandler())
 
         SegmentParserGroup().register()
         SegmentParserUseIfPresent().register()
@@ -171,7 +176,9 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
         val tpsProxy = getProxy(TPSProxy::class.java)
         ServerUtils.initialize { tpsProxy.getTPS() }
 
-        NumberUtils.initCrunch { exp, player -> evaluateExpression(exp, player) }
+        NumberUtils.initCrunch { expression, player, statics -> evaluateExpression(expression, player, statics) }
+
+        CustomItemsManager.registerProviders()
 
         postInit()
     }
@@ -263,9 +270,8 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
             IntegrationLoader("HeadDatabase") { CustomItemsManager.register(CustomItemsHeadDatabase(this)) },
             IntegrationLoader("ExecutableItems") { CustomItemsManager.register(CustomItemsExecutableItems()) },
             IntegrationLoader("CustomCrafting") {
-                CustomItemsManager.register(CustomItemsCustomCrafting()); ShapedRecipeListener.registerValidator(
-                CustomRecipeCustomCrafting()
-            )
+                CustomItemsManager.register(CustomItemsCustomCrafting())
+                CraftingRecipeListener.registerValidator(CustomRecipeCustomCrafting())
             },
             IntegrationLoader("MythicMobs") { CustomItemsManager.register(CustomItemsMythicMobs(this)) },
 
@@ -317,7 +323,7 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
             NaturalExpGainListeners(),
             ArmorListener(),
             EntityDeathByEntityListeners(this),
-            ShapedRecipeListener(),
+            CraftingRecipeListener(),
             StackedRecipeListener(this),
             GUIListener(this),
             ArrowDataListener(this),

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/DataYml.kt

@@ -10,5 +10,6 @@ class DataYml(
     "data",
     plugin,
     false,
-    ConfigType.YAML
+    ConfigType.YAML,
+    false
 )

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/EcoProfile.kt

@@ -27,7 +27,7 @@ abstract class EcoProfile(
             return this.data[key] as T
         }
 
-        this.data[key] = handler.read(uuid, key.key) ?: key.defaultValue
+        this.data[key] = handler.read(uuid, key) ?: key.defaultValue
         return read(key)
     }
 
@@ -36,11 +36,11 @@ abstract class EcoProfile(
             return false
         }
 
-        return this.data == other.data && this.uuid == other.uuid
+        return this.uuid == other.uuid
     }
 
     override fun hashCode(): Int {
-        return this.data.hashCode()
+        return this.uuid.hashCode()
     }
 
     companion object {

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/DataHandler.kt

@@ -23,5 +23,5 @@ interface DataHandler {
 
     fun <T> write(uuid: UUID, key: NamespacedKey, value: T)
     fun saveKeysFor(uuid: UUID, keys: Set<PersistentDataKey<*>>)
-    fun <T> read(uuid: UUID, key: NamespacedKey): T?
+    fun <T> read(uuid: UUID, key: PersistentDataKey<T>): T?
 }

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/MySQLDataHandler.kt

@@ -45,6 +45,7 @@ class MySQLDataHandler(
     private val serverHandler: ImplementedMySQLHandler
 
     init {
+
         val config = HikariConfig()
         config.driverClassName = "com.mysql.cj.jdbc.Driver"
         config.username = plugin.configYml.getString("mysql.user")
@@ -102,9 +103,9 @@ class MySQLDataHandler(
         }
     }
 
-    override fun <T> read(uuid: UUID, key: NamespacedKey): T? {
+    override fun <T> read(uuid: UUID, key: PersistentDataKey<T>): T? {
         return applyFor(uuid) {
-            it.read(uuid, key)
+            it.read(uuid, key.key)
         }
     }