Show exact tag for commit on diff view (#11846)

* Show exact tag for commit on diff view

* Fix comment

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

1 files changed, 16 insertions, 1 deletions

diff --git a/modules/git/commit.go b/modules/git/commit.go
index a114c902dd..d6448bf26e 100644
--- a/modules/git/commit.go
+++ b/modules/git/commit.go
@@ -466,7 +466,7 @@ func (c *Commit) GetSubModule(entryname string) (*SubModule, error) {
 	return nil, nil
 }
 
-// GetBranchName gets the closes branch name (as returned by 'git name-rev --name-only')
+// GetBranchName gets the closest branch name (as returned by 'git name-rev --name-only')
 func (c *Commit) GetBranchName() (string, error) {
 	data, err := NewCommand("name-rev", "--exclude", "refs/tags/*", "--name-only", "--no-undefined", c.ID.String()).RunInDir(c.repo.Path)
 	if err != nil {
@@ -482,6 +482,21 @@ func (c *Commit) GetBranchName() (string, error) {
 	return strings.SplitN(strings.TrimSpace(data), "~", 2)[0], nil
 }
 
+// GetTagName gets the current tag name for given commit
+func (c *Commit) GetTagName() (string, error) {
+	data, err := NewCommand("describe", "--exact-match", "--tags", c.ID.String()).RunInDir(c.repo.Path)
+	if err != nil {
+		// handle special case where there is no tag for this commit
+		if strings.Contains(err.Error(), "no tag exactly matches") {
+			return "", nil
+		}
+
+		return "", err
+	}
+
+	return strings.TrimSpace(data), nil
+}
+
 // CommitFileStatus represents status of files in a commit.
 type CommitFileStatus struct {
 	Added    []string