package index import ( "path/filepath" "strings" "gopkg.in/src-d/go-git.v4/plumbing/format/index" "gopkg.in/src-d/go-git.v4/utils/merkletrie/noder" ) // The node represents a index.Entry or a directory inferred from the path // of all entries. It implements the interface noder.Noder of merkletrie // package. // // This implementation implements a "standard" hash method being able to be // compared with any other noder.Noder implementation inside of go-git type node struct { path string entry *index.Entry children []noder.Noder isDir bool } // NewRootNode returns the root node of a computed tree from a index.Index, func NewRootNode(idx *index.Index) noder.Noder { const rootNode = "" m := map[string]*node{rootNode: {isDir: true}} for _, e := range idx.Entries { parts := strings.Split(e.Name, string(filepath.Separator)) var path string for _, part := range parts { parent := path path = filepath.Join(path, part) if _, ok := m[path]; ok { continue } n := &node{path: path} if path == e.Name { n.entry = e } else { n.isDir = true } m[n.path] = n m[parent].children = append(m[parent].children, n) } } return m[rootNode] } func (n *node) String() string { return n.path } // Hash the hash of a filesystem is a 24-byte slice, is the result of // concatenating the computed plumbing.Hash of the file as a Blob and its // plumbing.FileMode; that way the difftree algorithm will detect changes in the // contents of files and also in their mode. // // If the node is computed and not based on a index.Entry the hash is equals // to a 24-bytes slices of zero values. func (n *node) Hash() []byte { if n.entry == nil { return make([]byte, 24) } return append(n.entry.Hash[:], n.entry.Mode.Bytes()...) } func (n *node) Name() string { return filepath.Base(n.path) } func (n *node) IsDir() bool { return n.isDir } func (n *node) Children() ([]noder.Noder, error) { return n.children, nil } func (n *node) NumChildren() (int, error) { return len(n.children), nil }