Include commit hash in clientcommands build and use it in github link…

… in villager rng invalid setup help

build.gradle

@@ -1,4 +1,5 @@
 import net.earthcomputer.clientcommands.buildscript.CheckLanguageFilesTask
+import net.earthcomputer.clientcommands.buildscript.GenerateBuildInfoTask
 
 plugins {
 	id 'fabric-loom' version '1.9-SNAPSHOT'
@@ -94,6 +95,10 @@ jar {
 	from("LICENSE")
 }
 
+tasks.register('generateBuildInfo', GenerateBuildInfoTask) {
+	outputFile = new File(temporaryDir, "build_info.json")
+}
+
 processResources {
 	inputs.property "version", project.version
 	inputs.property "mcversion", project.minecraft_version_dependency
@@ -108,6 +113,8 @@ processResources {
 	from(sourceSets.main.resources.srcDirs) {
 		exclude "fabric.mod.json"
 	}
+
+	from generateBuildInfo
 }
 
 java {

buildSrc/src/main/kotlin/net/earthcomputer/clientcommands/buildscript/GenerateBuildInfoTask.kt

@@ -0,0 +1,40 @@
+package net.earthcomputer.clientcommands.buildscript
+
+import com.google.gson.Gson
+import com.google.gson.JsonObject
+import org.gradle.api.DefaultTask
+import org.gradle.api.file.RegularFileProperty
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+import org.gradle.process.ExecOperations
+import java.io.ByteArrayOutputStream
+import javax.inject.Inject
+
+abstract class GenerateBuildInfoTask : DefaultTask() {
+    @get:OutputFile
+    abstract val outputFile: RegularFileProperty
+
+    @get:Inject
+    protected abstract val execOperations: ExecOperations
+
+    init {
+        outputs.upToDateWhen { false }
+    }
+
+    @TaskAction
+    fun run() {
+        val gitCommitHashBytes = ByteArrayOutputStream()
+        execOperations.exec {
+            commandLine("git", "rev-parse", "HEAD")
+            standardOutput = gitCommitHashBytes
+        }.rethrowFailure()
+        val commitHash = gitCommitHashBytes.toByteArray().decodeToString().trim()
+
+        val json = JsonObject()
+        json.addProperty("commit_hash", commitHash)
+
+        outputFile.asFile.get().writer().use {
+            Gson().toJson(json, it)
+        }
+    }
+}

src/main/java/net/earthcomputer/clientcommands/features/VillagerCracker.java

@@ -10,6 +10,7 @@
 import net.earthcomputer.clientcommands.command.VillagerCommand;
 import net.earthcomputer.clientcommands.event.ClientConnectionEvents;
 import net.earthcomputer.clientcommands.event.MoreClientEvents;
+import net.earthcomputer.clientcommands.util.BuildInfo;
 import net.earthcomputer.clientcommands.util.CUtil;
 import net.earthcomputer.clientcommands.util.CombinedMedianEM;
 import net.minecraft.ChatFormatting;
@@ -287,7 +288,17 @@ private static void checkVillagerSetup() {
     }
 
     private static void sendInvalidSetupHelp() {
-        ClientCommandHelper.sendHelp(Component.translatable("villagerManip.help.setup", Component.translatable("villagerManip.help.setup.link").withStyle(style -> style.withUnderlined(true).withClickEvent(new ClickEvent(ClickEvent.Action.OPEN_URL, "https://raw.githubusercontent.com/Earthcomputer/clientcommands/refs/heads/fabric/dpcs/villager_rng_setup.png")))));
+        ClientCommandHelper.sendHelp(
+            Component.translatable("villagerManip.help.setup",
+                Component.translatable("villagerManip.help.setup.link").withStyle(style -> style
+                    .withUnderlined(true)
+                    .withClickEvent(new ClickEvent(
+                        ClickEvent.Action.OPEN_URL,
+                        "https://github.com/Earthcomputer/clientcommands/blob/%s/docs/villager_rng_setup.png?raw=true".formatted(BuildInfo.INSTANCE.shortCommitHash(10))
+                    ))
+                )
+            )
+        );
     }
 
     private static void onDisconnect() {

src/main/java/net/earthcomputer/clientcommands/util/BuildInfo.java

@@ -0,0 +1,48 @@
+package net.earthcomputer.clientcommands.util;
+
+import com.google.gson.FieldNamingPolicy;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.mojang.logging.LogUtils;
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.Util;
+import org.slf4j.Logger;
+
+import java.io.BufferedReader;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public record BuildInfo(String commitHash) {
+    private static final Logger LOGGER = LogUtils.getLogger();
+
+    private static final BuildInfo UNKNOWN = new BuildInfo("refs/heads/fabric");
+
+    public static final BuildInfo INSTANCE = Util.make(() -> {
+        Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES).create();
+
+        Path buildInfoPath = FabricLoader.getInstance().getModContainer("clientcommands")
+            .orElseThrow()
+            .findPath("build_info.json")
+            .orElse(null);
+        if (buildInfoPath == null) {
+            LOGGER.warn("Couldn't find build_info.json");
+            return UNKNOWN;
+        }
+
+        try (BufferedReader reader = Files.newBufferedReader(buildInfoPath)) {
+            BuildInfo result = gson.fromJson(reader, BuildInfo.class);
+            if (result == null) {
+                LOGGER.warn("build_info.json was null or empty");
+                return UNKNOWN;
+            }
+            return result;
+        } catch (Throwable e) {
+            LOGGER.warn("Couldn't read build_info.json", e);
+            return UNKNOWN;
+        }
+    });
+
+    public String shortCommitHash(int length) {
+        return this == UNKNOWN || length >= commitHash.length() ? commitHash : commitHash.substring(0, length);
+    }
+}