Using Git Hash to Tag versions via Gradle

apply plugin: 'org.ajoberstar.grgit'

task doVersioning() {
    if (version == '') {
        def timestamp = new Date().format("yyyyMMddHHmmss")
        def githash = "${grgit.head().abbreviatedId}"
        def currentBranchName = branch ?: grgit.branch.current().name
        def shortBranchName = ["feature", "experiment", "spike", "bugfix", "hotfix"].find {
            currentBranchName.startsWith(it)
        }
        if (currentBranchName == "master") shortBranchName = "master"
        if (currentBranchName == "develop") shortBranchName = "develop"
        if (shortBranchName == null) shortBranchName = "feature"
        version = "${shortBranchName}-${githash}-${timestamp}"
        shortVersion = "${githash}-${timestamp}"
        new File("$projectDir/project-name.properties").text = "dockerTag=${version}" + "\n" + "shortVersion=${shortVersion}";
    }
}