Build-versionising script

buildscript.groovy

task release(){}
task feature(){}
task pre(){}
release.dependsOn build
feature.dependsOn build
pre.dependsOn build

if (gradle.startParameter.taskNames.any {it.contains('release') }) {
    version = "${getVersion()}+${bumpBuildNumber()}b-RELEASE"
    bumpMajor()
}else if (gradle.startParameter.taskNames.any {it.contains('feature') }) {
    version = "${getVersion()}+${bumpBuildNumber()}b-${getGitHash()}"
    bumpMinor()
}else if (gradle.startParameter.taskNames.any {it.contains('pre') }) {
    version = "${getVersion()}+${bumpBuildNumber()}b-${getGitHash()}"
    bumpPath()
}else if (gradle.startParameter.taskNames.any {it.contains('build') }){
    version = "${getVersion()}+${bumpBuildNumber()}b-${getGitHash()}-SNAPSHOT"
}else{
    version = "${getVersion()}+${getBuildNumber()}b-${getGitHash()}-SNAPSHOT"
}

static def getGitHash() {
    def process = 'git rev-parse --short HEAD'.execute()
    process.waitFor()
    return (process.exitValue() ? 'unknown' : process.text.trim())
}
def bumpBuildNumber() {
    def propsFile = file('./buildnumber')

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        def nextBuild = props.buildNumber
        if (nextBuild == null) {
            nextBuild = 0
        } else {
            nextBuild = nextBuild.toInteger() + 1
        }

        props.buildNumber = nextBuild.toString()
        props.store(propsFile.newWriter(), null)

        return nextBuild
    } else {
        throw new GradleException('Cannot read gradle.properties')
    }
}
def getBuildNumber() {
    def propsFile = file('./buildnumber')

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        return props.buildNumber
    } else {
        throw new GradleException('Cannot read gradle.properties')
    }
}
def bumpMajor() {
    def propsFile = file('./buildnumber')

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        def nextBuild = props.major
        if (nextBuild == null) {
            nextBuild = 0
        } else {
            nextBuild = nextBuild.toInteger() + 1
            props.minor = "0"
            props.path = "0"
        }

        props.major = nextBuild.toString()
        props.store(propsFile.newWriter(), null)

    } else {
        throw new GradleException('Cannot read ./buildnumber')
    }
}
def bumpMinor() {
    def propsFile = file('./buildnumber')

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        def nextBuild = props.minor
        if (nextBuild == null) {
            nextBuild = 0
        } else {
            nextBuild = nextBuild.toInteger() + 1
            props.path = "0"
        }

        props.minor = nextBuild.toString()
        props.store(propsFile.newWriter(), null)

    } else {
        throw new GradleException('Cannot read ./buildnumber')
    }
}
def bumpPath() {
    def propsFile = file('./buildnumber')

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        def nextBuild = props.path
        if (nextBuild == null) {
            nextBuild = 1
        } else {
            nextBuild = nextBuild.toInteger() + 1
        }

        props.path = nextBuild.toString()
        props.store(propsFile.newWriter(), null)

    } else {
        throw new GradleException('Cannot read ./buildnumber')
    }
}
def getVersion() {
    def propsFile = file('./buildnumber')
    if(!propsFile.exists())
        propsFile.createNewFile()

    if (propsFile.canRead() && propsFile.canWrite()) {
        Properties props = new Properties()
        props.load(new FileInputStream(propsFile))

        def major = props.major
        def minor = props.minor
        def path = props.path

        if (major == null) {
            major = 0
            props.major = major.toString()
            props.store(propsFile.newWriter(), null)
        }
        if (minor == null) {
            minor = 0
            props.minor = minor.toString()
            props.store(propsFile.newWriter(), null)
        }
        if (path == null) {
            path = 1
            props.path = path.toString()
            props.store(propsFile.newWriter(), null)
        }

        return "${major}.${minor}.${path}"
    } else {
        throw new GradleException('Cannot read ./buildnumber')
    }
}