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package commitgraph
import (
"io"
"time"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/storer"
)
// CommitNode is generic interface encapsulating a lightweight commit object retrieved
// from CommitNodeIndex
type CommitNode interface {
// ID returns the Commit object id referenced by the commit graph node.
ID() plumbing.Hash
// Tree returns the Tree referenced by the commit graph node.
Tree() (*object.Tree, error)
// CommitTime returns the Committer.When time of the Commit referenced by the commit graph node.
CommitTime() time.Time
// NumParents returns the number of parents in a commit.
NumParents() int
// ParentNodes return a CommitNodeIter for parents of specified node.
ParentNodes() CommitNodeIter
// ParentNode returns the ith parent of a commit.
ParentNode(i int) (CommitNode, error)
// ParentHashes returns hashes of the parent commits for a specified node
ParentHashes() []plumbing.Hash
// Generation returns the generation of the commit for reachability analysis.
// Objects with newer generation are not reachable from objects of older generation.
Generation() uint64
// Commit returns the full commit object from the node
Commit() (*object.Commit, error)
}
// CommitNodeIndex is generic interface encapsulating an index of CommitNode objects
type CommitNodeIndex interface {
// Get returns a commit node from a commit hash
Get(hash plumbing.Hash) (CommitNode, error)
}
// CommitNodeIter is a generic closable interface for iterating over commit nodes.
type CommitNodeIter interface {
Next() (CommitNode, error)
ForEach(func(CommitNode) error) error
Close()
}
// parentCommitNodeIter provides an iterator for parent commits from associated CommitNodeIndex.
type parentCommitNodeIter struct {
node CommitNode
i int
}
func newParentgraphCommitNodeIter(node CommitNode) CommitNodeIter {
return &parentCommitNodeIter{node, 0}
}
// Next moves the iterator to the next commit and returns a pointer to it. If
// there are no more commits, it returns io.EOF.
func (iter *parentCommitNodeIter) Next() (CommitNode, error) {
obj, err := iter.node.ParentNode(iter.i)
if err == object.ErrParentNotFound {
return nil, io.EOF
}
if err == nil {
iter.i++
}
return obj, err
}
// ForEach call the cb function for each commit contained on this iter until
// an error appends or the end of the iter is reached. If ErrStop is sent
// the iteration is stopped but no error is returned. The iterator is closed.
func (iter *parentCommitNodeIter) ForEach(cb func(CommitNode) error) error {
for {
obj, err := iter.Next()
if err != nil {
if err == io.EOF {
return nil
}
return err
}
if err := cb(obj); err != nil {
if err == storer.ErrStop {
return nil
}
return err
}
}
}
func (iter *parentCommitNodeIter) Close() {
}
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