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authorMáximo Cuadros <mcuadros@gmail.com>2017-04-09 10:33:09 +0200
committerMáximo Cuadros <mcuadros@gmail.com>2017-04-11 04:34:49 +0200
commit6a00b3004a9bc9f86a041b59dc27e6b24695fc13 (patch)
treeaa10c054aaf6d48742dcaa089175cd79660593b0 /utils/merkletrie
parent777dcd5647ffb263a8bbf3887232ee207138468a (diff)
downloadgo-git-6a00b3004a9bc9f86a041b59dc27e6b24695fc13.tar.gz
merkletrie: node support for index file
Diffstat (limited to 'utils/merkletrie')
-rw-r--r--utils/merkletrie/index/node.go113
-rw-r--r--utils/merkletrie/index/node_test.go116
2 files changed, 229 insertions, 0 deletions
diff --git a/utils/merkletrie/index/node.go b/utils/merkletrie/index/node.go
new file mode 100644
index 0000000..7972f7f
--- /dev/null
+++ b/utils/merkletrie/index/node.go
@@ -0,0 +1,113 @@
+package index
+
+import (
+ "bytes"
+ "path/filepath"
+
+ "strings"
+
+ "gopkg.in/src-d/go-git.v4/plumbing/format/index"
+ "gopkg.in/src-d/go-git.v4/utils/merkletrie/noder"
+)
+
+func IsEquals(a, b noder.Hasher) bool {
+ pathA := a.(noder.Path)
+ pathB := b.(noder.Path)
+ if pathA[len(pathA)-1].IsDir() || pathB[len(pathB)-1].IsDir() {
+ return false
+ }
+
+ return bytes.Equal(a.Hash(), b.Hash())
+}
+
+type Node struct {
+ index *index.Index
+ parent string
+ name string
+ entry index.Entry
+ isDir bool
+}
+
+func NewRootNode(idx *index.Index) (*Node, error) {
+ return &Node{index: idx, isDir: true}, nil
+}
+
+func (n *Node) String() string {
+ return n.fullpath()
+}
+
+func (n *Node) Hash() []byte {
+ if n.IsDir() {
+ return nil
+ }
+
+ return append(n.entry.Hash[:], n.entry.Mode.Bytes()...)
+}
+
+func (n *Node) Name() string {
+ return n.name
+}
+
+func (n *Node) IsDir() bool {
+ return n.isDir
+}
+
+func (n *Node) Children() ([]noder.Noder, error) {
+ path := n.fullpath()
+ dirs := make(map[string]bool)
+
+ var c []noder.Noder
+ for _, e := range n.index.Entries {
+ if e.Name == path {
+ continue
+ }
+
+ prefix := path
+ if prefix != "" {
+ prefix += "/"
+ }
+
+ if !strings.HasPrefix(e.Name, prefix) {
+ continue
+ }
+
+ name := e.Name[len(path):]
+ if len(name) != 0 && name[0] == '/' {
+ name = name[1:]
+ }
+
+ parts := strings.Split(name, "/")
+ if len(parts) > 1 {
+ dirs[parts[0]] = true
+ continue
+ }
+
+ c = append(c, &Node{
+ index: n.index,
+ parent: path,
+ name: name,
+ entry: e,
+ })
+ }
+
+ for dir := range dirs {
+ c = append(c, &Node{
+ index: n.index,
+ parent: path,
+ name: dir,
+ isDir: true,
+ })
+
+ }
+
+ return c, nil
+}
+
+func (n *Node) NumChildren() (int, error) {
+ files, err := n.Children()
+ return len(files), err
+}
+
+func (n *Node) fullpath() string {
+ return filepath.Join(n.parent, n.name)
+}
diff --git a/utils/merkletrie/index/node_test.go b/utils/merkletrie/index/node_test.go
new file mode 100644
index 0000000..0ee0884
--- /dev/null
+++ b/utils/merkletrie/index/node_test.go
@@ -0,0 +1,116 @@
+package index
+
+import (
+ "testing"
+
+ . "gopkg.in/check.v1"
+ "gopkg.in/src-d/go-git.v4/plumbing"
+ "gopkg.in/src-d/go-git.v4/plumbing/format/index"
+ "gopkg.in/src-d/go-git.v4/utils/merkletrie"
+)
+
+func Test(t *testing.T) { TestingT(t) }
+
+type NoderSuite struct{}
+
+var _ = Suite(&NoderSuite{})
+
+func (s *NoderSuite) TestDiff(c *C) {
+ indexA := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ indexB := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ nodeA, err := NewRootNode(indexA)
+ c.Assert(err, IsNil)
+ nodeB, err := NewRootNode(indexB)
+ c.Assert(err, IsNil)
+
+ ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
+ c.Assert(err, IsNil)
+ c.Assert(ch, HasLen, 0)
+}
+
+func (s *NoderSuite) TestDiffChange(c *C) {
+ indexA := &index.Index{
+ Entries: []index.Entry{
+ {Name: "bar/baz/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ indexB := &index.Index{
+ Entries: []index.Entry{
+ {Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ nodeA, err := NewRootNode(indexA)
+ c.Assert(err, IsNil)
+ nodeB, err := NewRootNode(indexB)
+ c.Assert(err, IsNil)
+
+ ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
+ c.Assert(err, IsNil)
+ c.Assert(ch, HasLen, 2)
+}
+
+func (s *NoderSuite) TestDiffDir(c *C) {
+ indexA := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ indexB := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ nodeA, err := NewRootNode(indexA)
+ c.Assert(err, IsNil)
+ nodeB, err := NewRootNode(indexB)
+ c.Assert(err, IsNil)
+
+ ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
+ c.Assert(err, IsNil)
+ c.Assert(ch, HasLen, 2)
+}
+
+func (s *NoderSuite) TestDiffSameRoot(c *C) {
+ indexA := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo.go", Hash: plumbing.NewHash("aab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ indexB := &index.Index{
+ Entries: []index.Entry{
+ {Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ {Name: "foo.go", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
+ },
+ }
+
+ nodeA, err := NewRootNode(indexA)
+ c.Assert(err, IsNil)
+ nodeB, err := NewRootNode(indexB)
+ c.Assert(err, IsNil)
+
+ ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
+ c.Assert(err, IsNil)
+ c.Assert(ch, HasLen, 1)
+}