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-rw-r--r--plumbing/object/commit.go12
-rw-r--r--plumbing/object/commit_test.go12
2 files changed, 24 insertions, 0 deletions
diff --git a/plumbing/object/commit.go b/plumbing/object/commit.go
index fad3dac..b2f1f15 100644
--- a/plumbing/object/commit.go
+++ b/plumbing/object/commit.go
@@ -3,6 +3,7 @@ package object
import (
"bufio"
"bytes"
+ "errors"
"fmt"
"io"
"strings"
@@ -98,6 +99,17 @@ func (c *Commit) NumParents() int {
return len(c.ParentHashes)
}
+var ErrParentNotFound = errors.New("commit parent not found")
+
+// Parent returns the ith parent of a commit.
+func (c *Commit) Parent(i int) (*Commit, error) {
+ if len(c.ParentHashes) == 0 || i > len(c.ParentHashes)-1 {
+ return nil, ErrParentNotFound
+ }
+
+ return GetCommit(c.s, c.ParentHashes[i])
+}
+
// File returns the file with the specified "path" in the commit and a
// nil error if the file exists. If the file does not exist, it returns
// a nil file and the ErrFileNotFound error.
diff --git a/plumbing/object/commit_test.go b/plumbing/object/commit_test.go
index e84160b..f0792e6 100644
--- a/plumbing/object/commit_test.go
+++ b/plumbing/object/commit_test.go
@@ -67,6 +67,18 @@ func (s *SuiteCommit) TestParents(c *C) {
i.Close()
}
+func (s *SuiteCommit) TestParent(c *C) {
+ commit, err := s.Commit.Parent(1)
+ c.Assert(err, IsNil)
+ c.Assert(commit.Hash.String(), Equals, "a5b8b09e2f8fcb0bb99d3ccb0958157b40890d69")
+}
+
+func (s *SuiteCommit) TestParentNotFound(c *C) {
+ commit, err := s.Commit.Parent(42)
+ c.Assert(err, Equals, ErrParentNotFound)
+ c.Assert(commit, IsNil)
+}
+
func (s *SuiteCommit) TestPatch(c *C) {
from := s.commit(c, plumbing.NewHash("918c48b83bd081e863dbe1b80f8998f058cd8294"))
to := s.commit(c, plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"))