1 files changed, 149 insertions, 0 deletions
diff --git a/modules/git/repo_tag.go b/modules/git/repo_tag.go
new file mode 100644
index 0000000000..84825d7dc3
--- /dev/null
+++ b/modules/git/repo_tag.go
@@ -0,0 +1,149 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"strings"
+
+	"github.com/mcuadros/go-version"
+)
+
+// TagPrefix tags prefix path on the repository
+const TagPrefix = "refs/tags/"
+
+// IsTagExist returns true if given tag exists in the repository.
+func IsTagExist(repoPath, name string) bool {
+	return IsReferenceExist(repoPath, TagPrefix+name)
+}
+
+// IsTagExist returns true if given tag exists in the repository.
+func (repo *Repository) IsTagExist(name string) bool {
+	return IsTagExist(repo.Path, name)
+}
+
+// CreateTag create one tag in the repository
+func (repo *Repository) CreateTag(name, revision string) error {
+	_, err := NewCommand("tag", name, revision).RunInDir(repo.Path)
+	return err
+}
+
+func (repo *Repository) getTag(id SHA1) (*Tag, error) {
+	t, ok := repo.tagCache.Get(id.String())
+	if ok {
+		log("Hit cache: %s", id)
+		return t.(*Tag), nil
+	}
+
+	// Get tag type
+	tp, err := NewCommand("cat-file", "-t", id.String()).RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+	tp = strings.TrimSpace(tp)
+
+	// Tag is a commit.
+	if ObjectType(tp) == ObjectCommit {
+		tag := &Tag{
+			ID:     id,
+			Object: id,
+			Type:   string(ObjectCommit),
+			repo:   repo,
+		}
+
+		repo.tagCache.Set(id.String(), tag)
+		return tag, nil
+	}
+
+	// Tag with message.
+	data, err := NewCommand("cat-file", "-p", id.String()).RunInDirBytes(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	tag, err := parseTagData(data)
+	if err != nil {
+		return nil, err
+	}
+
+	tag.ID = id
+	tag.repo = repo
+
+	repo.tagCache.Set(id.String(), tag)
+	return tag, nil
+}
+
+// GetTag returns a Git tag by given name.
+func (repo *Repository) GetTag(name string) (*Tag, error) {
+	idStr, err := repo.GetTagCommitID(name)
+	if err != nil {
+		return nil, err
+	}
+
+	id, err := NewIDFromString(idStr)
+	if err != nil {
+		return nil, err
+	}
+
+	tag, err := repo.getTag(id)
+	if err != nil {
+		return nil, err
+	}
+	tag.Name = name
+	return tag, nil
+}
+
+// GetTagInfos returns all tag infos of the repository.
+func (repo *Repository) GetTagInfos() ([]*Tag, error) {
+	// TODO this a slow implementation, makes one git command per tag
+	stdout, err := NewCommand("tag").RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	tagNames := strings.Split(stdout, "\n")
+	var tags = make([]*Tag, 0, len(tagNames))
+	for _, tagName := range tagNames {
+		tagName = strings.TrimSpace(tagName)
+		if len(tagName) == 0 {
+			continue
+		}
+
+		tag, err := repo.GetTag(tagName)
+		if err != nil {
+			return nil, err
+		}
+		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")
+	if version.Compare(gitVersion, "2.0.0", ">=") {
+		cmd.AddArguments("--sort=-v:refname")
+	}
+
+	stdout, err := cmd.RunInDir(repo.Path)
+	if err != nil {
+		return nil, err
+	}
+
+	tags := strings.Split(stdout, "\n")
+	tags = tags[:len(tags)-1]
+
+	if version.Compare(gitVersion, "2.0.0", "<") {
+		version.Sort(tags)
+
+		// Reverse order
+		for i := 0; i < len(tags)/2; i++ {
+			j := len(tags) - i - 1
+			tags[i], tags[j] = tags[j], tags[i]
+		}
+	}
+
+	return tags, nil
+}