Gradle rename plugin

CustomPlugin.groovy

class CustomPlugin implements Plugin<Project> {

    @Override
    void apply(Project project) {
        project.task('renameAppVersionName', type: RenameAppVersionNameTask)
        project.tasks.getByName('preBuild').dependsOn('renameAppVersionName')
    }
}

RenameAppVersionNameTask.groovy

class RenameAppVersionNameTask extends DefaultTask {

  @TaskAction
  def run() {
    project.configure(project) {
      // Check if plugin works on an Android module
      if (it.hasProperty("android")) {
        // Iterate over app build variants (build types + flavors)
        project.android.applicationVariants.all { variant ->
          // Only change debug build type variants
          if (variant.buildType.name == project.android.buildTypes.debug.name) {
            // Rename versionName
            def customVersionName = variant.mergedFlavor.versionName
            variant.mergedFlavor.versionName = customVersionName + " custom"
          }
        }
      }
    }
  }

  RenameAppVersionNameTask() {
    group = 'customPlugin'
    description = 'Renames versionName of the app depends on the current git branch name'
  }
}

Resume.txt

// Use
apply plugin: CustomPlugin

// src
buildSrc/src/main/groovy/es/guiguegon