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package object
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
)
type bfsCommitIterator struct {
seenExternal map[plumbing.Hash]bool
seen map[plumbing.Hash]bool
queue []*Commit
}
// NewCommitIterBSF returns a CommitIter that walks the commit history,
// starting at the given commit and visiting its parents in pre-order.
// The given callback will be called for each visited commit. Each commit will
// be visited only once. If the callback returns an error, walking will stop
// and will return the error. Other errors might be returned if the history
// cannot be traversed (e.g. missing objects). Ignore allows to skip some
// commits from being iterated.
func NewCommitIterBSF(
c *Commit,
seenExternal map[plumbing.Hash]bool,
ignore []plumbing.Hash,
) CommitIter {
seen := make(map[plumbing.Hash]bool)
for _, h := range ignore {
seen[h] = true
}
return &bfsCommitIterator{
seenExternal: seenExternal,
seen: seen,
queue: []*Commit{c},
}
}
func (w *bfsCommitIterator) appendHash(store storer.EncodedObjectStorer, h plumbing.Hash) error {
if w.seen[h] || w.seenExternal[h] {
return nil
}
c, err := GetCommit(store, h)
if err != nil {
return err
}
w.queue = append(w.queue, c)
return nil
}
func (w *bfsCommitIterator) Next() (*Commit, error) {
var c *Commit
for {
if len(w.queue) == 0 {
return nil, io.EOF
}
c = w.queue[0]
w.queue = w.queue[1:]
if w.seen[c.Hash] || w.seenExternal[c.Hash] {
continue
}
w.seen[c.Hash] = true
for _, h := range c.ParentHashes {
err := w.appendHash(c.s, h)
if err != nil {
return nil, nil
}
}
return c, nil
}
}
func (w *bfsCommitIterator) ForEach(cb func(*Commit) error) error {
for {
c, err := w.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
err = cb(c)
if err == storer.ErrStop {
break
}
if err != nil {
return err
}
}
return nil
}
func (w *bfsCommitIterator) Close() {}
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