diff options
Diffstat (limited to 'internal/oldgit/patch.go')
| -rw-r--r-- | internal/oldgit/patch.go | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/internal/oldgit/patch.go b/internal/oldgit/patch.go new file mode 100644 index 0000000..329bdfb --- /dev/null +++ b/internal/oldgit/patch.go @@ -0,0 +1,39 @@ +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 +} + +var NullTree object.Tree //nolint:gochecknoglobals |