315 lines
6.7 KiB
Go
315 lines
6.7 KiB
Go
package object
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import (
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"container/list"
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"io"
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"gopkg.in/src-d/go-git.v4/plumbing"
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"gopkg.in/src-d/go-git.v4/plumbing/storer"
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"gopkg.in/src-d/go-git.v4/storage"
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)
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type commitPreIterator struct {
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seenExternal map[plumbing.Hash]bool
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seen map[plumbing.Hash]bool
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stack []CommitIter
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start *Commit
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}
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// NewCommitPreorderIter returns a CommitIter that walks the commit history,
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// starting at the given commit and visiting its parents in pre-order.
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// The given callback will be called for each visited commit. Each commit will
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// be visited only once. If the callback returns an error, walking will stop
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// and will return the error. Other errors might be returned if the history
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// cannot be traversed (e.g. missing objects). Ignore allows to skip some
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// commits from being iterated.
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func NewCommitPreorderIter(
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c *Commit,
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seenExternal map[plumbing.Hash]bool,
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ignore []plumbing.Hash,
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) CommitIter {
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seen := make(map[plumbing.Hash]bool)
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for _, h := range ignore {
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seen[h] = true
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}
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return &commitPreIterator{
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seenExternal: seenExternal,
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seen: seen,
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stack: make([]CommitIter, 0),
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start: c,
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}
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}
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func (w *commitPreIterator) Next() (*Commit, error) {
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var c *Commit
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for {
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if w.start != nil {
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c = w.start
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w.start = nil
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} else {
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current := len(w.stack) - 1
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if current < 0 {
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return nil, io.EOF
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}
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var err error
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c, err = w.stack[current].Next()
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if err == io.EOF {
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w.stack = w.stack[:current]
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continue
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}
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if err != nil {
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return nil, err
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}
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}
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if w.seen[c.Hash] || w.seenExternal[c.Hash] {
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continue
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}
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w.seen[c.Hash] = true
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if c.NumParents() > 0 {
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w.stack = append(w.stack, filteredParentIter(c, w.seen))
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}
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return c, nil
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}
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}
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func filteredParentIter(c *Commit, seen map[plumbing.Hash]bool) CommitIter {
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var hashes []plumbing.Hash
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for _, h := range c.ParentHashes {
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if !seen[h] {
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hashes = append(hashes, h)
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}
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}
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return NewCommitIter(c.s,
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storer.NewEncodedObjectLookupIter(c.s, plumbing.CommitObject, hashes),
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)
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}
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func (w *commitPreIterator) ForEach(cb func(*Commit) error) error {
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for {
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c, err := w.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return err
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}
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err = cb(c)
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if err == storer.ErrStop {
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break
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (w *commitPreIterator) Close() {}
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type commitPostIterator struct {
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stack []*Commit
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seen map[plumbing.Hash]bool
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}
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// NewCommitPostorderIter returns a CommitIter that walks the commit
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// history like WalkCommitHistory but in post-order. This means that after
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// walking a merge commit, the merged commit will be walked before the base
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// it was merged on. This can be useful if you wish to see the history in
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// chronological order. Ignore allows to skip some commits from being iterated.
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func NewCommitPostorderIter(c *Commit, ignore []plumbing.Hash) CommitIter {
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seen := make(map[plumbing.Hash]bool)
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for _, h := range ignore {
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seen[h] = true
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}
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return &commitPostIterator{
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stack: []*Commit{c},
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seen: seen,
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}
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}
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func (w *commitPostIterator) Next() (*Commit, error) {
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for {
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if len(w.stack) == 0 {
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return nil, io.EOF
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}
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c := w.stack[len(w.stack)-1]
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w.stack = w.stack[:len(w.stack)-1]
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if w.seen[c.Hash] {
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continue
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}
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w.seen[c.Hash] = true
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return c, c.Parents().ForEach(func(p *Commit) error {
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w.stack = append(w.stack, p)
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return nil
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})
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}
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}
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func (w *commitPostIterator) ForEach(cb func(*Commit) error) error {
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for {
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c, err := w.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return err
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}
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err = cb(c)
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if err == storer.ErrStop {
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break
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (w *commitPostIterator) Close() {}
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// commitAllIterator stands for commit iterator for all refs.
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type commitAllIterator struct {
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// currCommit points to the current commit.
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currCommit *list.Element
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}
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// NewCommitAllIter returns a new commit iterator for all refs.
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// repoStorer is a repo Storer used to get commits and references.
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// commitIterFunc is a commit iterator function, used to iterate through ref commits in chosen order
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func NewCommitAllIter(repoStorer storage.Storer, commitIterFunc func(*Commit) CommitIter) (CommitIter, error) {
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commitsPath := list.New()
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commitsLookup := make(map[plumbing.Hash]*list.Element)
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head, err := storer.ResolveReference(repoStorer, plumbing.HEAD)
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if err != nil {
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return nil, err
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}
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// add all references along with the HEAD
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if err = addReference(repoStorer, commitIterFunc, head, commitsPath, commitsLookup); err != nil {
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return nil, err
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}
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refIter, err := repoStorer.IterReferences()
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if err != nil {
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return nil, err
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}
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defer refIter.Close()
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err = refIter.ForEach(
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func(ref *plumbing.Reference) error {
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return addReference(repoStorer, commitIterFunc, ref, commitsPath, commitsLookup)
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},
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)
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if err != nil {
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return nil, err
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}
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return &commitAllIterator{commitsPath.Front()}, nil
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}
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func addReference(
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repoStorer storage.Storer,
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commitIterFunc func(*Commit) CommitIter,
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ref *plumbing.Reference,
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commitsPath *list.List,
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commitsLookup map[plumbing.Hash]*list.Element) error {
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_, exists := commitsLookup[ref.Hash()]
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if exists {
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// we already have it - skip the reference.
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return nil
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}
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refCommit, _ := GetCommit(repoStorer, ref.Hash())
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if refCommit == nil {
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// if it's not a commit - skip it.
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return nil
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}
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var (
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refCommits []*Commit
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parent *list.Element
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)
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// collect all ref commits to add
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commitIter := commitIterFunc(refCommit)
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for c, e := commitIter.Next(); e == nil; {
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parent, exists = commitsLookup[c.Hash]
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if exists {
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break
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}
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refCommits = append(refCommits, c)
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c, e = commitIter.Next()
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}
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commitIter.Close()
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if parent == nil {
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// common parent - not found
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// add all commits to the path from this ref (maybe it's a HEAD and we don't have anything, yet)
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for _, c := range refCommits {
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parent = commitsPath.PushBack(c)
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commitsLookup[c.Hash] = parent
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}
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} else {
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// add ref's commits to the path in reverse order (from the latest)
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for i := len(refCommits) - 1; i >= 0; i-- {
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c := refCommits[i]
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// insert before found common parent
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parent = commitsPath.InsertBefore(c, parent)
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commitsLookup[c.Hash] = parent
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}
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}
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return nil
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}
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func (it *commitAllIterator) Next() (*Commit, error) {
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if it.currCommit == nil {
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return nil, io.EOF
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}
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c := it.currCommit.Value.(*Commit)
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it.currCommit = it.currCommit.Next()
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return c, nil
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}
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func (it *commitAllIterator) ForEach(cb func(*Commit) error) error {
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for {
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c, err := it.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return err
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}
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err = cb(c)
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if err == storer.ErrStop {
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break
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (it *commitAllIterator) Close() {
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it.currCommit = nil
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}
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