version-info.gradle

project.metaClass.getVersionInfo = {
    def appVersion = 'noversion'
    def appRelease = 0
    def appDescription = project.name

    // Find out the last matching tag
    final prefix = "release-${project.name}-"
    final tag = "git describe --tags --long --match $prefix*".execute().text.trim()

    // Look at source dirs only
    final srcDirs = ['nailgun-server/src/main', 'nailgun-client/src', 'pynailgun']

    if (tag) {
        // Split version details
        final matcher = (tag =~ "$prefix([^-]+(-RC[0-9]+)?)-[0-9]+-g[a-z0-9]+")
        appVersion = matcher[0][1]

        // List revisions sice the last release (incl. the release itself)
        List<String> command = ['git', 'rev-list', (prefix + appVersion + '~1..HEAD').toString(), '--'] + srcDirs
        ProcessBuilder pb = new ProcessBuilder(command)
        final revs = pb.start().text.split()
        final lastRev = revs ? "-" + revs[0].substring(0, 7) : ''

        // Find out if the project is dirty
        command = ['git', 'status', '--short', '--', 'src', '--'] + srcDirs
        pb = new ProcessBuilder(command)
        final dirty = pb.start().text.trim().length() > 0

        appRelease = Math.max(0, dirty ? revs.size() : revs.size() - 1) // commit distance
        appDescription = "${project.name} v$appVersion.$appRelease$lastRev"
    }

    return [appVersion, appRelease, appDescription]
}