feat: Add ref page

Now there is page more tailored to a single ref.

5 files changed, 94 insertions, 1 deletions

diff --git a/pkg/ext/router.go b/pkg/ext/router.go
index e12a40c..ce4c126 100644
--- a/pkg/ext/router.go
+++ b/pkg/ext/router.go
@@ -8,6 +8,7 @@ import (
 
 	"git.gabrielgio.me/cerrado/pkg/service"
 	"git.gabrielgio.me/cerrado/templates"
+	"github.com/go-git/go-git/v5/plumbing"
 )
 
 type (
@@ -36,7 +37,8 @@ func (r *Router) AddMiddleware(middleware Middleware) {
 func wrapError(next ErrorRequestHandler) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if err := next(w, r); err != nil {
-			if errors.Is(err, service.ErrRepositoryNotFound) {
+			if errors.Is(err, service.ErrRepositoryNotFound) ||
+				errors.Is(err, plumbing.ErrReferenceNotFound) {
 				NotFound(w, r)
 			} else {
 				slog.Error("Internal Server Error", "error", err)
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 {
diff --git a/pkg/handler/git/handler.go b/pkg/handler/git/handler.go
index 034d5c2..a9be54c 100644
--- a/pkg/handler/git/handler.go
+++ b/pkg/handler/git/handler.go
@@ -350,6 +350,28 @@ func (g *GitHandler) Log(w http.ResponseWriter, r *http.Request) error {
 	return nil
 }
 
+func (g *GitHandler) Ref(w http.ResponseWriter, r *http.Request) error {
+	ext.SetHTML(w)
+	name := r.PathValue("name")
+	ref := r.PathValue("ref")
+
+	commit, tag, err := g.gitService.GetTag(ref, name)
+	if err != nil {
+		return err
+	}
+
+	gitList := &templates.GitItemPage{
+		Name: name,
+		Ref:  ref,
+		GitItemBase: &templates.GitItemRefPage{
+			Commit:    commit,
+			Reference: tag,
+		},
+	}
+	templates.WritePageTemplate(w, gitList, r.Context())
+	return nil
+}
+
 func (g *GitHandler) Commit(w http.ResponseWriter, r *http.Request) error {
 	ext.SetHTML(w)
 	name := r.PathValue("name")
diff --git a/pkg/handler/router.go b/pkg/handler/router.go
index 8d27b74..e461922 100644
--- a/pkg/handler/router.go
+++ b/pkg/handler/router.go
@@ -52,6 +52,7 @@ func MountHandler(
 	mux.HandleFunc("/{name}/blob/{ref}/{rest...}", gitHandler.Blob)
 	mux.HandleFunc("/{name}/log/{ref}/", gitHandler.Log)
 	mux.HandleFunc("/{name}/commit/{ref}/", gitHandler.Commit)
+	mux.HandleFunc("/{name}/ref/{ref}/", gitHandler.Ref)
 	mux.HandleFunc("/{name}/archive/{file}", gitHandler.Archive)
 	mux.HandleFunc("/about", aboutHandler.About)
 	mux.HandleFunc("/", gitHandler.List)
diff --git a/pkg/service/git.go b/pkg/service/git.go
index 8642b5b..5410d7a 100644
--- a/pkg/service/git.go
+++ b/pkg/service/git.go
@@ -241,6 +241,25 @@ func (g *GitService) GetAbout(name string) ([]byte, error) {
 	return file, nil
 }
 
+func (g *GitService) GetTag(ref, name string) (*object.Commit, *git.TagReference, error) {
+	r := g.configRepo.GetByName(name)
+	if r == nil {
+		return nil, nil, ErrRepositoryNotFound
+	}
+
+	repo, err := git.OpenRepository(r.Path)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	err = repo.SetRef(ref)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return repo.Tag()
+}
+
 func (g *GitService) ListTags(name string) ([]*git.TagReference, error) {
 	r := g.configRepo.GetByName(name)
 	if r == nil {