Add get tags info method for releases (#27)

* add get tags info method for releases

* composite variable decleare

Author: lunny

repo_tag.go

@@ -6,6 +6,7 @@ package git
 
 import (
 	"strings"
+	"time"
 
 	"github.com/mcuadros/go-version"
 )
@@ -94,6 +95,87 @@ func (repo *Repository) GetTag(name string) (*Tag, error) {
 	return tag, nil
 }
 
+// TagOption describes tag options
+type TagOption struct {
+}
+
+// parseTag parse the line
+// 2016-10-14 20:54:25 +0200  (tag: translation/20161014.01) d3b76dcf2 Dirk Baeumer [email protected] Merge in translations
+func parseTag(line string, opt TagOption) (*Tag, error) {
+	line = strings.TrimSpace(line)
+	if len(line) < 40 {
+		return nil, nil
+	}
+
+	var (
+		err error
+		tag Tag
+		sig Signature
+	)
+	sig.When, err = time.Parse("2006-01-02 15:04:05 -0700", line[0:25])
+	if err != nil {
+		return nil, err
+	}
+
+	left := strings.TrimSpace(line[25:])
+	start := strings.Index(left, "(tag: ")
+	if start < 0 {
+		return nil, nil
+	}
+	end := strings.IndexByte(left[start+1:], ')')
+	if end < 0 {
+		return nil, nil
+	}
+	end = end + start + 1
+	part := strings.IndexByte(left[start+6:end], ',')
+	if part > 0 {
+		tag.Name = strings.TrimSpace(left[start+6 : start+6+part])
+	} else {
+		tag.Name = strings.TrimSpace(left[start+6 : end])
+	}
+	next := strings.IndexByte(left[end+2:], ' ')
+	if next < 0 {
+		return nil, nil
+	}
+	tag.Object = MustIDFromString(strings.TrimSpace(left[end+2 : end+2+next]))
+	next = end + 2 + next
+
+	emailStart := strings.IndexByte(left[next:], '<')
+	sig.Name = strings.TrimSpace(left[next:][:emailStart-1])
+	emailEnd := strings.IndexByte(left[next:], '>')
+	sig.Email = strings.TrimSpace(left[next:][emailStart+1 : emailEnd])
+	tag.Tagger = &sig
+	tag.Message = strings.TrimSpace(left[next+emailEnd+1:])
+	return &tag, nil
+}
+
+// GetTagInfos returns all tag infos of the repository.
+func (repo *Repository) GetTagInfos(opt TagOption) ([]*Tag, error) {
+	cmd := NewCommand("log", "--tags", "--simplify-by-decoration", `--pretty=format:"%ci %d %H %cn<%ce> %s"`)
+	stdout, err := cmd.RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	tagSlices := strings.Split(stdout, "\n")
+	var tags []*Tag
+	for _, line := range tagSlices {
+		line := strings.Trim(line, `"`)
+		tag, err := parseTag(line, opt)
+		if err != nil {
+			return nil, err
+		}
+		if tag != nil {
+			tag.repo = repo
+			tags = append(tags, tag)
+		}
+	}
+
+	sortTagsByTime(tags)
+
+	return tags, nil
+}
+
 // GetTags returns all tags of the repository.
 func (repo *Repository) GetTags() ([]string, error) {
 	cmd := NewCommand("tag", "-l")

tag.go

@@ -4,7 +4,10 @@
 
 package git
 
-import "bytes"
+import (
+	"bytes"
+	"sort"
+)
 
 // Tag represents a Git tag.
 type Tag struct {
@@ -64,3 +67,23 @@ l:
 	}
 	return tag, nil
 }
+
+type tagSorter []*Tag
+
+func (ts tagSorter) Len() int {
+	return len([]*Tag(ts))
+}
+
+func (ts tagSorter) Less(i, j int) bool {
+	return []*Tag(ts)[i].Tagger.When.After([]*Tag(ts)[j].Tagger.When)
+}
+
+func (ts tagSorter) Swap(i, j int) {
+	[]*Tag(ts)[i], []*Tag(ts)[j] = []*Tag(ts)[j], []*Tag(ts)[i]
+}
+
+// sortTagsByTime
+func sortTagsByTime(tags []*Tag) {
+	sorter := tagSorter(tags)
+	sort.Sort(sorter)
+}