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// SPDX-License-Identifier: AGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
package oldgit
import (
"errors"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
)
// CommitToPatch creates an [object.Patch] from the first parent of a given
// [object.Commit].
//
// TODO: This function should be deprecated as it only diffs with the first
// parent and does not correctly handle merge commits.
func CommitToPatch(commit *object.Commit) (parentCommitHash plumbing.Hash, patch *object.Patch, err error) {
var parentCommit *object.Commit
var commitTree *object.Tree
parentCommit, err = commit.Parent(0)
switch {
case errors.Is(err, object.ErrParentNotFound):
if commitTree, err = commit.Tree(); err != nil {
return
}
if patch, err = NullTree.Patch(commitTree); err != nil {
return
}
case err != nil:
return
default:
parentCommitHash = parentCommit.Hash
if patch, err = parentCommit.Patch(commit); err != nil {
return
}
}
return
}
// NullTree is a tree object that is empty and has no hash.
var NullTree object.Tree //nolint:gochecknoglobals
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