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package commitgraph
import (
"io"
"github.com/emirpasic/gods/trees/binaryheap"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/storer"
)
type commitNodeIteratorByCTime struct {
heap *binaryheap.Heap
seenExternal map[plumbing.Hash]bool
seen map[plumbing.Hash]bool
}
// NewCommitNodeIterCTime returns a CommitNodeIter that walks the commit history,
// starting at the given commit and visiting its parents while preserving Committer Time order.
// this appears to be the closest order to `git log`
// 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 NewCommitNodeIterCTime(
c CommitNode,
seenExternal map[plumbing.Hash]bool,
ignore []plumbing.Hash,
) CommitNodeIter {
seen := make(map[plumbing.Hash]bool)
for _, h := range ignore {
seen[h] = true
}
heap := binaryheap.NewWith(func(a, b interface{}) int {
if a.(CommitNode).CommitTime().Before(b.(CommitNode).CommitTime()) {
return 1
}
return -1
})
heap.Push(c)
return &commitNodeIteratorByCTime{
heap: heap,
seenExternal: seenExternal,
seen: seen,
}
}
func (w *commitNodeIteratorByCTime) Next() (CommitNode, error) {
var c CommitNode
for {
cIn, ok := w.heap.Pop()
if !ok {
return nil, io.EOF
}
c = cIn.(CommitNode)
cID := c.ID()
if w.seen[cID] || w.seenExternal[cID] {
continue
}
w.seen[cID] = true
for i, h := range c.ParentHashes() {
if w.seen[h] || w.seenExternal[h] {
continue
}
pc, err := c.ParentNode(i)
if err != nil {
return nil, err
}
w.heap.Push(pc)
}
return c, nil
}
}
func (w *commitNodeIteratorByCTime) ForEach(cb func(CommitNode) 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 *commitNodeIteratorByCTime) Close() {}
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