Function applyEdit

pkg/util/fileutil/fileutil.go:263–293

applyEdit applies a single edit to the content and returns the modified content and result.

(content []byte, edit EditSpec, index int)

// applyEdit applies a single edit to the content and returns the modified content and result.
func applyEdit(content []byte, edit EditSpec, index int) ([]byte, EditResult) {
	result := EditResult{
		Desc: edit.Desc,
	}
	if result.Desc == "" {
		result.Desc = fmt.Sprintf("Edit %d", index+1)
	}

	if edit.OldStr == "" {
		result.Applied = false
		result.Error = "old_str cannot be empty"
		return content, result
	}

	oldBytes := []byte(edit.OldStr)
	count := bytes.Count(content, oldBytes)
	if count == 0 {
		result.Applied = false
		result.Error = "old_str not found in file"
		return content, result
	}
	if count > 1 {
		result.Applied = false
		result.Error = fmt.Sprintf("old_str appears %d times, must appear exactly once", count)
		return content, result
	}

	modifiedContent := bytes.Replace(content, oldBytes, []byte(edit.NewStr), 1)
	result.Applied = true
	return modifiedContent, result
}

// ApplyEdits applies a series of edits to the given content and returns the modified content.
// This is atomic - all edits succeed or all fail.