feat: Add ref page

Now there is page more tailored to a single ref.

1 files changed, 49 insertions, 0 deletions

diff --git a/pkg/git/git.go b/pkg/git/git.go
index d72e561..64c721a 100644
--- a/pkg/git/git.go
+++ b/pkg/git/git.go
@@ -19,6 +19,7 @@ import (
 var (
 	MissingRefErr  = errors.New("Reference not found")
 	TreeForFileErr = errors.New("Trying to get tree of a file")
+	eofIter        = errors.New("End of a iterator")
 )
 
 type (
@@ -198,6 +199,54 @@ func (g *GitRepository) Head() (*plumbing.Reference, error) {
 	return g.repository.Head()
 }
 
+func (g *GitRepository) Tag() (*object.Commit, *TagReference, error) {
+	err := g.validateRef()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	c, err := g.repository.CommitObject(g.ref)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var tagReference *TagReference
+
+	iter, err := g.repository.Tags()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if err := iter.ForEach(func(ref *plumbing.Reference) error {
+		obj, err := g.repository.TagObject(ref.Hash())
+		switch err {
+		case nil:
+			if obj.Target == c.Hash {
+				tagReference = &TagReference{
+					ref: ref,
+					tag: obj,
+				}
+				return eofIter
+			}
+			return nil
+		case plumbing.ErrObjectNotFound:
+			if c.Hash == ref.Hash() {
+				tagReference = &TagReference{
+					ref: ref,
+				}
+				return eofIter
+			}
+			return nil
+		default:
+			return err
+		}
+	}); err != nil && !errors.Is(eofIter, err) {
+		return nil, nil, err
+	}
+
+	return c, tagReference, nil
+}
+
 func (g *GitRepository) Tags() ([]*TagReference, error) {
 	iter, err := g.repository.Tags()
 	if err != nil {