Gradle: Add decompile task to projects (#1273)

* Gradle: Add decompile task to projects

* add ff as dependency rather than adding ti in buildsrc

* smh smh smh smh smh

* Add ff version in buildsrc build file

This doesn't work in ext as it officially isn't part of the project

* Add missing ''s

build.gradle

@@ -33,7 +33,7 @@ ext {
     asm = '7.1'
     commonsCli = '1.4'
     discord = '1.1'
-    fernflower = '20171017'
+    fernflower = '07082019'
     findbugs = '3.0.2'
     gson = '2.8.5'
     guava = '28.0-jre'
@@ -82,7 +82,7 @@ ext {
 
 allprojects {
     apply plugin: 'maven'
-    apply plugin: 'checkstyle'
+    if (this.name != 'rs-client') apply plugin: 'checkstyle'
 
     group = 'net.runelite'
     version = '1.5.33-SNAPSHOT'
@@ -105,6 +105,7 @@ subprojects {
     apply plugin: 'java-library'
     apply plugin: 'maven'
     apply plugin: "com.github.ben-manes.versions"
+    apply plugin: 'fernflower'
 
     sourceCompatibility = 1.8
     targetCompatibility = 1.8

buildSrc/build.gradle

@@ -0,0 +1,7 @@
+repositories {
+    maven { url "https://raw.githubusercontent.com/runelite-extended/maven-repo/master" }
+}
+dependencies {
+    compile localGroovy()
+    implementation group: 'net.runelite', name: 'fernflower', version: '07082019'
+}

buildSrc/src/main/groovy/FernflowerPlugin.groovy

@@ -0,0 +1,16 @@
+import org.gradle.api.Plugin
+import org.gradle.api.Project
+import org.gradle.api.tasks.StopExecutionException
+
+class FernflowerPlugin implements Plugin<Project> {
+    void apply(Project project) {
+        project.task('decompile', type: FernflowerTask) {
+            it.dependsOn(project.tasks.jar)
+            it.doFirst {
+                if (!project.tasks.jar.didWork) {
+                    throw new StopExecutionException()
+                }
+            }
+        }
+    }
+}

buildSrc/src/main/groovy/FernflowerTask.groovy

@@ -0,0 +1,32 @@
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.InputFile
+import org.gradle.api.tasks.OutputDirectory
+import org.gradle.api.tasks.TaskAction
+import org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler
+
+class FernflowerTask extends DefaultTask {
+    List<String> extraArgs
+    String inputJar
+    String outputDir
+
+    @InputFile
+    File getInputJar() {
+        project.file(inputJar ?: project.buildDir.toString() + '/libs/' + project.getName() + '-' + project.version + '.jar')
+    }
+
+    @OutputDirectory
+    File getOutputDir() {
+        project.file(outputDir ?: project.buildDir.toString() + '/decompiled-sources')
+    }
+
+    @TaskAction
+    void decompile() {
+        getOutputDir().mkdirs()
+        def args = [getInputJar().toString(), getOutputDir().toString()]
+        if (extraArgs) {
+            args.addAll(extraArgs)
+        }
+
+        ConsoleDecompiler.main(args as String[])
+    }
+}

buildSrc/src/main/resources/META-INF/gradle-plugins/fernflower.properties

@@ -0,0 +1 @@
+implementation-class=FernflowerPlugin

injected-client/build.gradle

@@ -44,3 +44,6 @@ classes.doLast() {
     File f = file("build/classes/java/main/Placeholder.class")
     f.delete()
 }
+
+// tasks.build.dependsOn(tasks.decompile)
+// this is just here to show how this could be used