Smart versionName and versionCode for android Gradle build evaluation

build.gradle

    /**
     * Will return version from properties file and replace -SNAPSHOT by GIT commit hash
     * to recognize origin commit for the every build.
     */
    project.ext.evalVersionName = {
        def ideBuild = project.properties['android.injected.invoked.from.ide']
        if (ideBuild) {
            logger.info("IDE build");
            return "dev"
        } else  if (project.VERSION.toUpperCase().contains("SNAPSHOT")) {
            logger.info("SNAPSHOT build");
            if (checkUncommitedChanges()) {
                logger.warn("You have uncommited changes!")
            }
            return project.VERSION.toUpperCase().replace("SNAPSHOT", getGitHash())
        }

        if (checkUncommitedChanges()) {
            logger.error("You have uncommited changes!")
        }
        return project.VERSION;
    }

    /**
     * Creates versionCode from number of commits in GIT
     */
    project.ext.evalVersionCode = {
        // number of commits from HEAD to oldest one, useful for releasing from one branch only
        // def p = Runtime.getRuntime().exec("git rev-list HEAD --count")
        // number of commit in all branches together (also dead one)
        def p = Runtime.getRuntime().exec("git rev-list --all --count")

        def result = p.waitFor()
        if (result != 0) {
            return 0 // no git revisions
        }
        return p.getInputStream().readLines().get(0).toInteger()
    }

    /**
     * Renames APK name to contain version, build number and commit hash.
     */
    project.ext.renameApk = { variant ->
        def file = variant.outputFile
        def gitHash = getGitHash()
        def name = project.parent.name + "-" + project.name + "-" +
            variant.mergedFlavor.versionName + "-" +
            variant.mergedFlavor.versionCode + "-" +
            gitHash + "-" + variant.mergedFlavor.name + "," + variant.buildType.name

        variant.outputFile = new File(file.parent, name + ".apk")
    }

    /**
     * Return last commit git hash string.
     */
    project.ext.getGitHash = {
        // git hash
        def command = Runtime.getRuntime().exec("git rev-parse --short HEAD")
        def result = command.waitFor()
        return (result == 0) ? command.inputStream.text.trim() : "nogit"
    }

    /**
     * Check if project has uncommited changes
     */
    project.ext.checkUncommitedChanges = {
        def command = Runtime.getRuntime().exec("git diff-index --quiet HEAD")
        return command.waitFor() == 1
    }