Use git commit sha and rev to specify mod version

build.gradle.kts

@@ -1,17 +1,17 @@
 import groovy.lang.Closure
-import groovy.util.Node
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import java.util.Date
 import java.text.SimpleDateFormat
-import groovy.util.NodeList
-import org.gradle.kotlin.dsl.accessors.runtime.addDependencyTo
+import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream
 
 val mod_version: String by project
 val mc_version: String by project
 val forge_version: String by project
 val mod_id: String by project
 val handle_deps: String by project
+val use_commit_hash_in_version: String by project
 val handleDeps = handle_deps == "true"
+val useCommitHashInVersion = use_commit_hash_in_version == "true"
 
 plugins {
 	java
@@ -26,9 +26,62 @@ configurations {
 	get("implementation").extendsFrom(get("library"), get("klibrary"))
 }
 
-version = mod_version
+version = if (useCommitHashInVersion) getCommitVersion() else mod_version
 group = "ru.dbotthepony"
 
+fun getCommitVersion(): String {
+	try {
+		val versionStream = FastByteArrayOutputStream()
+		val tagStream = FastByteArrayOutputStream()
+		val countStream = FastByteArrayOutputStream()
+
+		val gotVersion = exec {
+			commandLine("git", "rev-parse", "--short", "HEAD")
+			workingDir(".")
+			standardOutput = versionStream
+		}.exitValue == 0
+
+		val gotCount = exec {
+			commandLine("git", "rev-list", "--count", "HEAD")
+			workingDir(".")
+			standardOutput = countStream
+		}.exitValue == 0
+
+		val gotTag = exec {
+			commandLine("git", "tag", "--points-at", "HEAD")
+			workingDir(".")
+			standardOutput = tagStream
+		}.exitValue == 0
+
+		val version = versionStream.array.copyOfRange(0, versionStream.length).toString(Charsets.UTF_8).trim()
+		val tag = tagStream.array.copyOfRange(0, tagStream.length).toString(Charsets.UTF_8).trim()
+		val count = countStream.array.copyOfRange(0, countStream.length).toString(Charsets.UTF_8).trim()
+
+		if (!gotVersion) {
+			return mod_version
+		}
+
+		if (gotTag && tag != "") {
+			if (gotCount && count != "") {
+				return "$tag-SNAPSHOT-${version}_$count"
+			} else {
+				return "$tag-SNAPSHOT-$version"
+			}
+		}
+
+		if (gotCount && count != "") {
+			return "$mod_version-SNAPSHOT-${version}_$count"
+		}
+
+		return "$mod_version-SNAPSHOT-$version"
+	} catch(err: Throwable) {
+		println("Error getting git version")
+		println(err)
+	}
+
+	return mod_version
+}
+
 java.toolchain.languageVersion.set(JavaLanguageVersion.of(17))
 println("Targeting Java ${java.toolchain.languageVersion.get()}")
 

gradle.properties

@@ -5,7 +5,9 @@ org.gradle.daemon=true
 kotlin.stdlib.default.dependency=false
 
 mod_id=overdrive_that_matters
-mod_version=1.0-SNAPSHOT
+mod_version=1.0
+
+use_commit_hash_in_version=true
 
 mc_version=1.19.2
 forge_gradle_version=5.1.27