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package packfile
import "fmt"
type Packfile struct {
Version uint32
Size int64
ObjectCount int
Checksum []byte
Commits map[string]*Commit
Trees map[string]*Tree
Blobs map[string]*Blob
}
func NewPackfile() *Packfile {
return &Packfile{
Commits: make(map[string]*Commit, 0),
Trees: make(map[string]*Tree, 0),
Blobs: make(map[string]*Blob, 0),
}
}
type BlobEntry struct {
path string
*Blob
}
type SubtreeEntry struct {
path string
*Tree
TreeCh
}
type treeEntry interface {
isTreeEntry()
Path() string
}
func (b BlobEntry) isTreeEntry() {}
func (b BlobEntry) Path() string { return b.path }
func (b SubtreeEntry) isTreeEntry() {}
func (b SubtreeEntry) Path() string { return b.path }
type TreeCh <-chan treeEntry
func (p *Packfile) WalkCommit(commitHash string) (TreeCh, error) {
commit, ok := p.Commits[commitHash]
if !ok {
return nil, fmt.Errorf("Unable to find %q commit", commitHash)
}
treeHash := fmt.Sprintf("%x", string(commit.Tree))
return p.WalkTree(p.Trees[treeHash]), nil
}
func (p *Packfile) WalkTree(tree *Tree) TreeCh {
return p.walkTree(tree, "")
}
func (p *Packfile) walkTree(tree *Tree, pathPrefix string) TreeCh {
ch := make(chan treeEntry)
if tree == nil {
close(ch)
return ch
}
go func() {
defer func() {
close(ch)
}()
for _, e := range tree.Entries {
path := pathPrefix + e.Name
if blob, ok := p.Blobs[e.Hash]; ok {
ch <- BlobEntry{path, blob}
} else if subtree, ok := p.Trees[e.Hash]; ok {
ch <- SubtreeEntry{path, subtree, p.walkTree(subtree, path+"/")}
}
}
}()
return ch
}
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