Git and date based version name.

build.gradle

def checkIfTracked = { ->
	def stdout = new ByteArrayOutputStream()
	exec {
		commandLine 'git', 'status', '--porcelain'
		standardOutput = stdout
	}
	return stdout.toString().trim().equals("") ? "" : "-MODIFIED"
}

def getGitCommitDate = { ->
	def stdout = new ByteArrayOutputStream()
	exec {
		commandLine 'git', 'show', '-s', '--format=%cd'
		standardOutput = stdout
	}
	return new Date(stdout.toString().trim())
}

def getGitMonthCommitIndex = { ->
	def stdout = new ByteArrayOutputStream()
	exec {
		commandLine 'git', 'rev-list', '--count', 'HEAD', '--since="' + getGitCommitDate().format("yyyy-MM") + '-01"', '--before="' + getGitCommitDate().format("yyyy-MM-dd") + '"'
		standardOutput = stdout
	}
	return stdout.toString().trim()
}

def getGitBranch = { ->
	def stdout = new ByteArrayOutputStream()
	exec {
		commandLine 'git', 'rev-parse', '--abbrev-ref', 'HEAD'
		standardOutput = stdout
	}
	return stdout.toString().trim().equals("master") ? "" : (stdout.toString().trim().equals("develop") ? "-beta" : "-" + stdout.toString().trim().replace("feature/", "").replace("/", "-"))
}

def getVersion = { ->
	// Source: https://gist.github.com/ChrisAcrobat/f2a50096d9154b00859667807d1eba8a
	def stdout = new ByteArrayOutputStream()
	exec {
		commandLine 'git', 'show', '-s', '--format=%cd'
		standardOutput = stdout
	}
	def monthCount = getGitMonthCommitIndex()
	def branch = getGitBranch()
	return getGitCommitDate().format("yy.MM") + "." + monthCount + branch + checkIfTracked()
}

version getVersion()