feat: Add diff view

Adds a very simple diff view for a commit

1 files changed, 39 insertions, 0 deletions

diff --git a/pkg/git/git.go b/pkg/git/git.go
index a9c42ce..6221e33 100644
--- a/pkg/git/git.go
+++ b/pkg/git/git.go
@@ -179,6 +179,45 @@ func (g *GitRepository) Branches() ([]*plumbing.Reference, error) {
 	return branches, nil
 }
 
+func (g *GitRepository) Diff() (string, error) {
+	err := g.validateRef()
+	if err != nil {
+		return "", err
+	}
+
+	c, err := g.repository.CommitObject(g.ref)
+	if err != nil {
+		return "", err
+	}
+
+	commitTree, err := c.Tree()
+	if err != nil {
+		return "", err
+	}
+
+	patch := &object.Patch{}
+	parentTree := &object.Tree{}
+	if c.NumParents() != 0 {
+		parent, err := c.Parents().Next()
+		if err == nil {
+			parentTree, err = parent.Tree()
+			if err == nil {
+				patch, err = parentTree.Patch(commitTree)
+				if err != nil {
+					return "", err
+				}
+			}
+		}
+	} else {
+		patch, err = parentTree.Patch(commitTree)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	return patch.String(), nil
+}
+
 func (g *GitRepository) Tree(path string) (*object.Tree, error) {
 	err := g.validateRef()
 	if err != nil {