Inital commit

.gitignore

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+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+.gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Cache of project
+.gradletasknamecache
+
+**/build/
+
+# Common working directory
+run/
+runs/
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+/run

build.gradle

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+plugins {
+    id 'java'
+    id("xyz.jpenilla.run-paper") version "2.3.1"
+}
+
+group = 'de.doggoat'
+version = '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+    maven {
+        name = "spigotmc-repo"
+        url = "https://hub.spigotmc.org/nexus/content/repositories/snapshots/"
+    }
+    maven {
+        name = "sonatype"
+        url = "https://oss.sonatype.org/content/groups/public/"
+    }
+}
+
+configurations {
+    toCopy
+}
+
+dependencies {
+    compileOnly("org.spigotmc:spigot-api:1.21.1-R0.1-SNAPSHOT")
+}
+
+def targetJavaVersion = 21
+java {
+    def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+    sourceCompatibility = javaVersion
+    targetCompatibility = javaVersion
+    if (JavaVersion.current() < javaVersion) {
+        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+
+    if (targetJavaVersion >= 10 || JavaVersion.current().isJava10Compatible()) {
+        options.release.set(targetJavaVersion)
+    }
+}
+
+tasks {
+    runServer {
+        // Configure the Minecraft version for our task.
+        // This is the only required configuration besides applying the plugin.
+        // Your plugin's jar (or shadowJar if present) will be used automatically.
+        minecraftVersion("1.21.1")
+    }
+}
+
+processResources {
+    def props = [version: version]
+    inputs.properties props
+    filteringCharset 'UTF-8'
+    filesMatching('plugin.yml') {
+        expand props
+    }
+}

gradle/wrapper/gradle-wrapper.properties

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+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip

settings.gradle

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+rootProject.name = 'growable-rebalance'

src/main/java/de/doggoat/growableRebalance/GrowableRebalance.java

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+package de.doggoat.growableRebalance;
+
+import de.doggoat.growableRebalance.listeners.GrowthEventListener;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class GrowableRebalance extends JavaPlugin {
+
+    @Override
+    public void onEnable() {
+        // Plugin startup logic
+        getServer().getPluginManager().registerEvents(new GrowthEventListener(), this);
+    }
+
+    @Override
+    public void onDisable() {
+        // Plugin shutdown logic
+        getServer().getPluginManager().disablePlugin(this);
+    }
+}

src/main/java/de/doggoat/growableRebalance/listeners/GrowthEventListener.java

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+package de.doggoat.growableRebalance.listeners;
+import org.bukkit.Material;
+import org.bukkit.block.BlockState;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.world.StructureGrowEvent;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class GrowthEventListener implements Listener {
+
+    List<Material> dirtBlocks = Arrays.asList(Material.ROOTED_DIRT, Material.PODZOL);
+    List<Material> unreplaceableBlocks = Arrays.asList(Material.MOSS_BLOCK, Material.MUD, Material.MUDDY_MANGROVE_ROOTS);
+
+    @EventHandler
+    public void onStructureGrow(StructureGrowEvent e) {
+        Player p = e.getPlayer();
+        List<BlockState> forbiddenBlocks = e.getBlocks().stream()
+                .filter(blockState-> unreplaceableBlocks.contains(blockState.getBlock().getType()))
+                .filter(blockState -> dirtBlocks.contains(blockState.getType()))
+                .toList();
+
+        if (!forbiddenBlocks.isEmpty()) {
+            if (p != null) {
+                BlockState forbiddenBlockState = forbiddenBlocks.getFirst();
+                p.sendMessage("You cannot convert " + forbiddenBlockState.getBlock().getType().name() + " to " + forbiddenBlockState.getType().name());
+            }
+            e.setCancelled(true);
+        }
+    }
+
+}

src/main/resources/plugin.yml

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+name: 'GrowableRebalance'
+version: '1.0-SNAPSHOT'
+main: de.doggoat.growableRebalance.GrowableRebalance
+api-version: '1.21'