Add automatic version replacement in Forgelin.kt (#20)

* Add automatic version replacement in Forgelin.kt

* Remove unnecessary newlines caused by IDEA

build.gradle

@@ -31,8 +31,7 @@ minecraft {
 
 	mappings = mcp_mappings
 
-	replaceIn "Reference.kt"
+	replaceIn "Forgelin.kt"
-	replaceIn "Reference.kt"
 	replace "@VERSION@", mod_version
 
 	useDepAts = true
@@ -90,6 +89,25 @@ shadowJar {
 
 tasks.build.dependsOn shadowJar
 
+import net.minecraftforge.gradle.user.TaskSourceCopy
+
+// Enables source replacements for Kotlin code
+for (set in sourceSets) {
+	def taskName = "source${set.name.capitalize()}Kotlin"
+	def dir = new File(project.getBuildDir(), "sources/${set.name}/kotlin")
+	task(taskName, type: TaskSourceCopy) {
+		source = set.getKotlin()
+		output = dir
+	}
+	def compileTask = tasks[set.getCompileTaskName("kotlin")]
+	compileTask.source = dir
+	compileTask.dependsOn taskName
+	def dirPath = dir.toPath()
+	compileKotlin.include {
+		return it.file.toPath().startsWith(dirPath)
+	}
+}
+
 artifacts {
 	archives shadowJar
 }

src/main/kotlin/net/shadowfacts/forgelin/Forgelin.kt

@@ -10,6 +10,6 @@ object Forgelin {
 
 	const val MOD_ID = "forgelin"
 	const val NAME = "Forgelin"
-	const val VERSION = "1.4.2"
+	const val VERSION = "@VERSION@"
 
 }