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/
main.go
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/
main.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"strings"
"github.com/blang/semver"
)
type Tag struct {
Name string
Ref string
}
func getTagsFromPackedRefs(repoPath string) []Tag {
raw, err := ioutil.ReadFile(path.Join(repoPath, ".git", "packed-refs"))
result := make([]Tag, 0, 10)
if err != nil {
if os.IsNotExist(err) {
return result
}
return result
}
for _, line := range strings.Split(string(raw), "\n") {
elems := strings.Split(line, " ")
ref := elems[len(elems)-1]
if strings.HasPrefix(ref, "refs/tags/") {
tag := strings.TrimPrefix(ref, "refs/tags/")
result = append(result, Tag{Name: tag, Ref: elems[0]})
}
}
return result
}
func getTagsFromRefInfo(repoPath string) []Tag {
raw, err := ioutil.ReadFile(path.Join(repoPath, ".git", "info", "refs"))
result := make([]Tag, 0, 10)
if err != nil {
if os.IsNotExist(err) {
return result
}
return result
}
for _, line := range strings.Split(string(raw), "\n") {
elems := strings.Split(line, "\t")
ref := elems[len(elems)-1]
if strings.HasPrefix(ref, "refs/tags/") {
tag := strings.TrimPrefix(ref, "refs/tags/")
result = append(result, Tag{Name: tag, Ref: elems[0]})
}
}
return result
}
func getTagsFromRefs(repoPath string) []Tag {
tags := make([]Tag, 0, 10)
entries, err := ioutil.ReadDir(path.Join(repoPath, ".git", "refs", "tags"))
if err == nil {
for _, entry := range entries {
raw, err := ioutil.ReadFile(path.Join(repoPath, ".git", "refs", "tags", entry.Name()))
if err != nil {
log.Printf("Failed to parse reffile %s: %s", entry.Name(), err.Error())
continue
}
tags = append(tags, Tag{Name: entry.Name(), Ref: strings.TrimSpace(string(raw))})
}
}
return tags
}
func getTags(repoPath string) []Tag {
tags := getTagsFromRefInfo(repoPath)
for _, tag := range getTagsFromRefs(repoPath) {
tags = append(tags, tag)
}
for _, tag := range getTagsFromPackedRefs(repoPath) {
tags = append(tags, tag)
}
return tags
}
// getPreviousVersionRev checks the current repository for the latest version tag
// and returns its revision numbere
func getPreviousVersionRev(repoPath string, tags []Tag) (string, *semver.Version, error) {
var previousVersion *semver.Version
var previousRef string
for _, tag := range tags {
version, err := semver.Make(
strings.TrimPrefix(strings.TrimPrefix(tag.Name, "R"), "v"))
if err != nil {
log.Printf("Failed to parse %s: %s", tag.Name, err.Error())
continue
}
if previousVersion == nil || version.GT(*previousVersion) {
previousVersion = &version
previousRef = tag.Ref
}
}
if previousVersion != nil {
return previousRef, previousVersion, nil
}
return "", nil, nil
}
func getNewVersion(repoPath string, start, end string, oldVersion *semver.Version, tags []Tag) (*semver.Version, error) {
commits, err := GetLog(start, end, tags)
if err != nil {
return nil, err
}
maxSev := -1
commitLoop:
for _, commit := range commits {
// Edge case: the last commit actually contains a version tag of the "old version"
// and therefore should make this whole quest unnecessary. So if we find the tag
// of the oldVersion in here, we have to reset the maxSev value.
for _, version := range commit.GetVersions() {
if version.Equals(*oldVersion) {
maxSev = -1
continue commitLoop
}
}
sev, err := DetectChangeSeverity(&commit)
if err != nil {
continue
}
if sev > maxSev {
maxSev = sev
}
if maxSev == MAJOR {
break
}
}
if maxSev == -1 {
return nil, fmt.Errorf("No new version could be determined")
}
newVersion := IncrementVersion(*oldVersion, maxSev)
return &newVersion, nil
}
func main() {
customRawPrevVersion := flag.String("prev", "", "Force a previous version number")
var customPrevVersion *semver.Version
flag.Parse()
if *customRawPrevVersion != "" {
tmp := semver.MustParse(*customRawPrevVersion)
customPrevVersion = &tmp
}
args := flag.Args()
endRev := "HEAD"
startRev := ""
repoPath, err := GetRepoPath()
tags := getTags(repoPath)
var newVersion *semver.Version
var oldVersion *semver.Version
if err != nil {
log.Fatalf("Failed to open repository: %s", err.Error())
}
if len(args) == 0 {
startRev, oldVersion, err = getPreviousVersionRev(repoPath, tags)
if err != nil {
log.Fatalf("Failed to retrieve previous version: %s", err.Error())
}
} else if len(args) == 1 {
_, oldVersion, err = getPreviousVersionRev(repoPath, tags)
startRev = args[0]
} else {
startRev = args[0]
_, oldVersion, err = getPreviousVersionRev(repoPath, tags)
endRev = args[1]
}
if customPrevVersion != nil {
oldVersion = customPrevVersion
}
if oldVersion == nil {
log.Println("No previous version found")
newVersion = &semver.Version{Major: 1, Minor: 0, Patch: 0}
}
if oldVersion != nil {
log.Printf("Previous version: %s (%s)\n", oldVersion, startRev)
}
if newVersion == nil {
newVersion, err = getNewVersion(repoPath, startRev, endRev, oldVersion, tags)
if err != nil {
log.Fatalf("Failed to generate new version: %s", err.Error())
}
}
fmt.Println(newVersion)
}