8 "github.com/blang/semver"
11 func getTag(match ...string) (string, *semver.PRVersion) {
12 args := append([]string{
15 if tag, err := exec.Command("git", args...).Output(); err != nil {
18 tagParts := strings.Split(string(tag), "-")
19 if len(tagParts) == 3 {
20 if ahead, err := semver.NewPRVersion(tagParts[1]); err == nil {
21 return tagParts[0], &ahead
23 } else if len(tagParts) == 4 {
24 if ahead, err := semver.NewPRVersion(tagParts[2]); err == nil {
25 return tagParts[0] + "-" + tagParts[1], &ahead
29 return string(tag), nil
34 if tags, err := exec.Command("git", "tag").Output(); err != nil || len(tags) == 0 {
35 // no tags found -- fetch them
36 exec.Command("git", "fetch", "--tags").Run()
38 // Find the last vX.X.X Tag and get how many builds we are ahead of it.
39 versionStr, ahead := getTag("--match", "v*")
40 version, err := semver.ParseTolerant(versionStr)
42 // no version tag found so just return what ever we can find.
43 fmt.Println("0.0.0-unknown")
46 // Get the tag of the current revision.
47 tag, _ := getTag("--exact-match")
48 if tag == versionStr {
49 // Seems that we are going to build a release.
50 // So the version number should already be correct.
51 fmt.Println(version.String())
55 // If we don't have any tag assume "dev"
56 if tag == "" || strings.HasPrefix(tag, "nightly") {
59 // Get the most likely next version:
60 if !strings.Contains(version.String(), "rc") {
61 version.Patch = version.Patch + 1
64 if pr, err := semver.NewPRVersion(tag); err == nil {
65 // append the tag as pre-release name
66 version.Pre = append(version.Pre, pr)
70 // if we know how many commits we are ahead of the last release, append that too.
71 version.Pre = append(version.Pre, *ahead)
74 fmt.Println(version.String())