plumbing: object, enable renames in getFileStatsFromFilePatches

Diff has handled renames by default since 2020. This change sets Name
for the renamed file in a manner similar to diffstat.

2 files changed, 56 insertions, 2 deletions

diff --git a/plumbing/object/patch.go b/plumbing/object/patch.go
index 06bc35b..dd8fef4 100644
--- a/plumbing/object/patch.go
+++ b/plumbing/object/patch.go
@@ -317,8 +317,8 @@ func getFileStatsFromFilePatches(filePatches []fdiff.FilePatch) FileStats {
 			// File is deleted.
 			cs.Name = from.Path()
 		} else if from.Path() != to.Path() {
-			// File is renamed. Not supported.
-			// cs.Name = fmt.Sprintf("%s => %s", from.Path(), to.Path())
+			// File is renamed.
+			cs.Name = fmt.Sprintf("%s => %s", from.Path(), to.Path())
 		} else {
 			cs.Name = from.Path()
 		}
diff --git a/plumbing/object/patch_stats_test.go b/plumbing/object/patch_stats_test.go
new file mode 100644
index 0000000..f393c30
--- /dev/null
+++ b/plumbing/object/patch_stats_test.go
@@ -0,0 +1,54 @@
+package object_test
+
+import (
+	"time"
+
+	"github.com/go-git/go-billy/v5/memfs"
+	"github.com/go-git/go-billy/v5/util"
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/storage/memory"
+
+	fixtures "github.com/go-git/go-git-fixtures/v4"
+	. "gopkg.in/check.v1"
+)
+
+type PatchStatsSuite struct {
+	fixtures.Suite
+}
+
+var _ = Suite(&PatchStatsSuite{})
+
+func (s *PatchStatsSuite) TestStatsWithRename(c *C) {
+	cm := &git.CommitOptions{
+		Author: &object.Signature{Name: "Foo", Email: "foo@example.local", When: time.Now()},
+	}
+
+	fs := memfs.New()
+	r, err := git.Init(memory.NewStorage(), fs)
+	c.Assert(err, IsNil)
+
+	w, err := r.Worktree()
+	c.Assert(err, IsNil)
+
+	util.WriteFile(fs, "foo", []byte("foo\nbar\n"), 0644)
+
+	_, err = w.Add("foo")
+	c.Assert(err, IsNil)
+
+	_, err = w.Commit("foo\n", cm)
+	c.Assert(err, IsNil)
+
+	_, err = w.Move("foo", "bar")
+	c.Assert(err, IsNil)
+
+	hash, err := w.Commit("rename foo to bar", cm)
+	c.Assert(err, IsNil)
+
+	commit, err := r.CommitObject(hash)
+	c.Assert(err, IsNil)
+
+	fileStats, err := commit.Stats()
+	c.Assert(err, IsNil)
+	c.Assert(fileStats[0].Name, Equals, "foo => bar")
+}