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Monorepo for Tangled tangled.org
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import ( "bytes" "fmt" "log" "os" "os/exec" "slices" "strings"
"github.com/bluekeyes/go-gitdiff/gitdiff" "github.com/go-git/go-git/v5/plumbing" "github.com/go-git/go-git/v5/plumbing/object" "tangled.org/core/gitutil" "tangled.org/core/patchutil" "tangled.org/core/types")
func (g *GitRepo) Diff() (*types.NiceDiff, error) { c, err := g.r.CommitObject(g.h) if err != nil { return nil, fmt.Errorf("commit object: %w", err) }
patch := &object.Patch{} commitTree, err := c.Tree() parent := &object.Commit{} if err == nil { 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 nil, fmt.Errorf("patch: %w", err) } } } } else { patch, err = parentTree.Patch(commitTree) if err != nil { return nil, fmt.Errorf("patch: %w", err) } } }
diffs, _, err := gitdiff.Parse(strings.NewReader(patch.String())) if err != nil { log.Println(err) }
nd := types.NiceDiff{} for _, d := range diffs { ndiff := types.Diff{} ndiff.Name.New = d.NewName ndiff.Name.Old = d.OldName ndiff.IsBinary = d.IsBinary ndiff.IsNew = d.IsNew ndiff.IsDelete = d.IsDelete ndiff.IsCopy = d.IsCopy ndiff.IsRename = d.IsRename
for _, tf := range d.TextFragments { ndiff.TextFragments = append(ndiff.TextFragments, *tf) nd.Stat.Insertions += tf.LinesAdded nd.Stat.Deletions += tf.LinesDeleted }
nd.Diff = append(nd.Diff, ndiff) }
nd.Stat.FilesChanged += len(diffs) nd.Commit.FromGoGitCommit(c)
return &nd, nil}
func (g *GitRepo) MergeBase(a, b *object.Commit) (*object.Commit, error) { out, err := g.mergeBase(a.Hash.String(), b.Hash.String()) if err != nil { return nil, fmt.Errorf("merge-base %s %s: %w", a.Hash, b.Hash, err) }
hash := plumbing.NewHash(strings.TrimSpace(string(out))) return g.r.CommitObject(hash)}
func (g *GitRepo) DiffTree(commit1, commit2 *object.Commit) (*types.DiffTree, error) { tree1, err := commit1.Tree() if err != nil { return nil, err }
tree2, err := commit2.Tree() if err != nil { return nil, err }
diff, err := object.DiffTree(tree1, tree2) if err != nil { return nil, err }
patch, err := diff.Patch() if err != nil { return nil, err }
patchStr := patch.String() diffs, _, err := gitdiff.Parse(strings.NewReader(patchStr)) if err != nil { return nil, err }
return &types.DiffTree{ Rev1: commit1.Hash.String(), Rev2: commit2.Hash.String(), Patch: patchStr, Diff: diffs, }, nil}
// FormatPatch generates a git-format-patch output between two commits,// and returns the raw format-patch series, a parsed FormatPatch and an error.func (g *GitRepo) formatSinglePatch(commit plumbing.Hash, extraArgs ...string) (string, *types.FormatPatch, error) { var stdout bytes.Buffer
args := []string{ "-C", g.path, "format-patch", "-1", commit.String(), "--stdout", } args = append(args, extraArgs...)
cmd := gitutil.Contain(exec.Command("git", args...)) cmd.Stdout = &stdout cmd.Stderr = os.Stderr err := cmd.Run() if err != nil { return "", nil, err }
raw := stdout.String() formatPatch, err := patchutil.ExtractPatches(raw) if err != nil { return "", nil, err }
if len(formatPatch) > 1 { return "", nil, fmt.Errorf("running format-patch on single commit produced more than on patch") }
return raw, &formatPatch[0], nil}
// ChangedFilesBetween returns the list of files changed between oldSha and newSha.// If oldSha is the zero hash (initial push), all files in newSha are returned.func (g *GitRepo) ChangedFilesBetween(oldSha, newSha string) ([]string, error) { newCommit, err := g.ResolveRevision(newSha) if err != nil { return nil, err }
if plumbing.NewHash(oldSha) == plumbing.ZeroHash { tree, err := newCommit.Tree() if err != nil { return nil, err } var files []string tree.Files().ForEach(func(f *object.File) error { files = append(files, f.Name) return nil }) return files, nil }
oldCommit, err := g.ResolveRevision(oldSha) if err != nil { return nil, err }
dt, err := g.DiffTree(oldCommit, newCommit) if err != nil { return nil, err }
seen := make(map[string]struct{}) for _, f := range dt.Diff { if f.OldName != "" { seen[f.OldName] = struct{}{} } if f.NewName != "" { seen[f.NewName] = struct{}{} } }
files := make([]string, 0, len(seen)) for name := range seen { files = append(files, name) } return files, nil}
func (g *GitRepo) ResolveRevision(revStr string) (*object.Commit, error) { rev, err := g.r.ResolveRevision(plumbing.Revision(revStr)) if err != nil { return nil, fmt.Errorf("resolving revision %s: %w", revStr, err) }
commit, err := g.r.CommitObject(*rev) if err != nil {
return nil, fmt.Errorf("getting commit for %s: %w", revStr, err) }
return commit, nil}
func (g *GitRepo) commitsBetween(newCommit, oldCommit *object.Commit) ([]*object.Commit, error) { var commits []*object.Commit
output, err := g.revList( "--no-merges", // format-patch explicitly prepares only non-merges fmt.Sprintf("%s..%s", oldCommit.Hash.String(), newCommit.Hash.String()), ) if err != nil { return nil, fmt.Errorf("revlist: %w", err) }
lines := strings.Split(strings.TrimSpace(string(output)), "\n") if len(lines) == 1 && lines[0] == "" { return commits, nil }
for _, item := range lines { obj, err := g.r.CommitObject(plumbing.NewHash(item)) if err != nil { continue } commits = append(commits, obj) }
return commits, nil}
func (g *GitRepo) FormatPatch(base, commit2 *object.Commit) (string, []types.FormatPatch, error) { // get list of commits between commit2 and base commits, err := g.commitsBetween(commit2, base) if err != nil { return "", nil, fmt.Errorf("failed to get commits: %w", err) }
// reverse the list so we start from the oldest one and go up to the most recent one slices.Reverse(commits)
var allPatchesContent strings.Builder var allPatches []types.FormatPatch
for _, commit := range commits { changeId := "" if val, ok := commit.ExtraHeaders["change-id"]; ok { changeId = string(val) }
var additionalArgs []string if changeId != "" { additionalArgs = append(additionalArgs, "--add-header", fmt.Sprintf("Change-Id: %s", changeId)) }
stdout, patch, err := g.formatSinglePatch(commit.Hash, additionalArgs...) if err != nil { return "", nil, fmt.Errorf("failed to format patch for commit %s: %w", commit.Hash.String(), err) }
allPatchesContent.WriteString(stdout) allPatchesContent.WriteString("\n")
allPatches = append(allPatches, *patch) }
return allPatchesContent.String(), allPatches, nil}