mirror of
https://github.com/Luzifer/ansible-role-version.git
synced 2024-12-25 12:01:21 +00:00
184 lines
3.6 KiB
Go
184 lines
3.6 KiB
Go
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package object
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import (
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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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)
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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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