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// Package revlist provides support to access the ancestors of commits, in a
// similar way as the git-rev-list command.
package revlist
import (
"fmt"
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/filemode"
"gopkg.in/src-d/go-git.v4/plumbing/object"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
)
// Objects applies a complementary set. It gets all the hashes from all
// the reachable objects from the given objects. Ignore param are object hashes
// that we want to ignore on the result. All that objects must be accessible
// from the object storer.
func Objects(
s storer.EncodedObjectStorer,
objs,
ignore []plumbing.Hash,
) ([]plumbing.Hash, error) {
ignore, err := objects(s, ignore, nil, true)
if err != nil {
return nil, err
}
return objects(s, objs, ignore, false)
}
func objects(
s storer.EncodedObjectStorer,
objects,
ignore []plumbing.Hash,
allowMissingObjects bool,
) ([]plumbing.Hash, error) {
seen := hashListToSet(ignore)
result := make(map[plumbing.Hash]bool)
visited := make(map[plumbing.Hash]bool)
walkerFunc := func(h plumbing.Hash) {
if !seen[h] {
result[h] = true
seen[h] = true
}
}
for _, h := range objects {
if err := processObject(s, h, seen, visited, ignore, walkerFunc); err != nil {
if allowMissingObjects && err == plumbing.ErrObjectNotFound {
continue
}
return nil, err
}
}
return hashSetToList(result), nil
}
// processObject obtains the object using the hash an process it depending of its type
func processObject(
s storer.EncodedObjectStorer,
h plumbing.Hash,
seen map[plumbing.Hash]bool,
visited map[plumbing.Hash]bool,
ignore []plumbing.Hash,
walkerFunc func(h plumbing.Hash),
) error {
if seen[h] {
return nil
}
o, err := s.EncodedObject(plumbing.AnyObject, h)
if err != nil {
return err
}
do, err := object.DecodeObject(s, o)
if err != nil {
return err
}
switch do := do.(type) {
case *object.Commit:
return reachableObjects(do, seen, visited, ignore, walkerFunc)
case *object.Tree:
return iterateCommitTrees(seen, do, walkerFunc)
case *object.Tag:
walkerFunc(do.Hash)
return processObject(s, do.Target, seen, visited, ignore, walkerFunc)
case *object.Blob:
walkerFunc(do.Hash)
default:
return fmt.Errorf("object type not valid: %s. "+
"Object reference: %s", o.Type(), o.Hash())
}
return nil
}
// reachableObjects returns, using the callback function, all the reachable
// objects from the specified commit. To avoid to iterate over seen commits,
// if a commit hash is into the 'seen' set, we will not iterate all his trees
// and blobs objects.
// We assume all commits have the same parents, unless a commit has no parents.
// So when we've visited a commit before, we can stop iterating commits, as we've
// already processed all its ancestors before as well. `visited` keeps track of
// all the commits that have been visited that had parents.
func reachableObjects(
commit *object.Commit,
seen map[plumbing.Hash]bool,
visited map[plumbing.Hash]bool,
ignore []plumbing.Hash,
cb func(h plumbing.Hash),
) error {
i := object.NewCommitPreorderIter(commit, ignore)
for {
commit, err := i.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
if visited[commit.Hash] {
break
}
if seen[commit.Hash] {
continue
}
cb(commit.Hash)
if commit.NumParents() > 0 {
visited[commit.Hash] = true
}
tree, err := commit.Tree()
if err != nil {
return err
}
if err := iterateCommitTrees(seen, tree, cb); err != nil {
return err
}
}
return nil
}
// iterateCommitTrees iterate all reachable trees from the given commit
func iterateCommitTrees(
seen map[plumbing.Hash]bool,
tree *object.Tree,
cb func(h plumbing.Hash),
) error {
if seen[tree.Hash] {
return nil
}
cb(tree.Hash)
treeWalker := object.NewTreeWalker(tree, true, seen)
for {
_, e, err := treeWalker.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
if e.Mode == filemode.Submodule {
continue
}
if seen[e.Hash] {
continue
}
cb(e.Hash)
}
return nil
}
func hashSetToList(hashes map[plumbing.Hash]bool) []plumbing.Hash {
var result []plumbing.Hash
for key := range hashes {
result = append(result, key)
}
return result
}
func hashListToSet(hashes []plumbing.Hash) map[plumbing.Hash]bool {
result := make(map[plumbing.Hash]bool)
for _, h := range hashes {
result[h] = true
}
return result
}
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