snapshot of https://github.com/go-gitea/gitea.git (main, 2026-09-15; blobs > 131072B omitted)

services/repository/files/diff.go

@@ -0,0 +1,42 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package files
+
+import (
+	"context"
+	"strings"
+
+	repo_model "gitea.dev/models/repo"
+	"gitea.dev/services/gitdiff"
+)
+
+// GetDiffPreview produces and returns diff result of a file which is not yet committed.
+func GetDiffPreview(ctx context.Context, repo *repo_model.Repository, branch, treePath, oldContent, newContent string) (*gitdiff.Diff, error) {
+	if branch == "" {
+		branch = repo.DefaultBranch
+	}
+	t, err := NewTemporaryUploadRepository(repo)
+	if err != nil {
+		return nil, err
+	}
+	defer t.Close()
+	if err := t.Clone(ctx, branch, true); err != nil {
+		return nil, err
+	}
+	if err := t.SetDefaultIndex(ctx); err != nil {
+		return nil, err
+	}
+
+	// Add the object to the database
+	objectHash, err := t.HashObjectAndWrite(ctx, strings.NewReader(newContent))
+	if err != nil {
+		return nil, err
+	}
+
+	// Add the object to the index
+	if err := t.AddObjectToIndex(ctx, "100644", objectHash, treePath); err != nil {
+		return nil, err
+	}
+	return t.DiffIndex(ctx, oldContent, newContent)
+}