1 files changed, 229 insertions, 0 deletions
diff --git a/diff.go b/diff.go
new file mode 100644
index 0000000..d9570c9
--- /dev/null
+++ b/diff.go
@@ -0,0 +1,229 @@
+package git
+
+/*
+#include <git2.h>
+
+extern int _go_git_diff_foreach(git_diff *diff, int eachFile, int eachHunk, int eachLine, void *payload);
+*/
+import "C"
+import (
+	"runtime"
+	"unsafe"
+)
+
+type DiffFile struct {
+	file C.git_diff_file
+}
+
+func (df *DiffFile) Oid() *Oid {
+	return newOidFromC(&df.file.oid)
+}
+
+func (df *DiffFile) Path() string {
+	return C.GoString(df.file.path)
+}
+
+func (df *DiffFile) Size() int {
+	return int(df.file.size)
+}
+
+func (df *DiffFile) Flags() uint32 {
+	return uint32(df.file.flags)
+}
+
+func (df *DiffFile) Mode() uint16 {
+	return uint16(df.file.mode)
+}
+
+type DiffDelta struct {
+	delta C.git_diff_delta
+}
+
+func (dd *DiffDelta) Status() int {
+	return int(dd.delta.status)
+}
+
+func (dd *DiffDelta) Flags() uint32 {
+	return uint32(dd.delta.flags)
+}
+
+func (dd *DiffDelta) Similarity() uint16 {
+	return uint16(dd.delta.similarity)
+}
+
+func (dd *DiffDelta) OldFile() *DiffFile {
+	return &DiffFile{dd.delta.old_file}
+}
+
+func (dd *DiffDelta) NewFile() *DiffFile {
+	return &DiffFile{dd.delta.new_file}
+}
+
+type DiffHunk struct {
+	hunk C.git_diff_hunk
+	DiffDelta
+}
+
+func (dh *DiffHunk) OldStart() int {
+	return int(dh.hunk.old_start)
+}
+
+func (dh *DiffHunk) OldLines() int {
+	return int(dh.hunk.old_lines)
+}
+
+func (dh *DiffHunk) NewStart() int {
+	return int(dh.hunk.new_start)
+}
+
+func (dh *DiffHunk) NewLines() int {
+	return int(dh.hunk.new_lines)
+}
+
+func (dh *DiffHunk) Header() string {
+	return C.GoStringN(&dh.hunk.header[0], C.int(dh.hunk.header_len))
+}
+
+type DiffLine struct {
+	line C.git_diff_line
+	DiffHunk
+}
+
+func (dl *DiffLine) Origin() byte {
+	return byte(dl.line.origin)
+}
+
+func (dl *DiffLine) OldLineno() int {
+	return int(dl.line.old_lineno)
+}
+
+func (dl *DiffLine) NewLineno() int {
+	return int(dl.line.new_lineno)
+}
+
+func (dl *DiffLine) NumLines() int {
+	return int(dl.line.num_lines)
+}
+
+func (dl *DiffLine) Content() string {
+	return C.GoStringN(dl.line.content, C.int(dl.line.content_len))
+}
+
+func (dl *DiffLine) ContentOffset() int {
+	return int(dl.line.content_offset)
+}
+
+type Diff struct {
+	ptr *C.git_diff
+}
+
+func newDiff(ptr *C.git_diff) *Diff {
+	if ptr == nil {
+		return nil
+	}
+
+	diff := &Diff{
+		ptr: ptr,
+	}
+
+	runtime.SetFinalizer(diff, (*Diff).Free)
+	return diff
+}
+
+func (diff *Diff) Free() {
+	runtime.SetFinalizer(diff, nil)
+	C.git_diff_free(diff.ptr)
+}
+
+func (diff *Diff) forEachFileWrap(ch chan *DiffDelta) {
+	C._go_git_diff_foreach(diff.ptr, 1, 0, 0, unsafe.Pointer(&ch))
+	close(ch)
+}
+
+func (diff *Diff) ForEachFile() chan *DiffDelta {
+	ch := make(chan *DiffDelta, 0)
+	go diff.forEachFileWrap(ch)
+	return ch
+}
+
+//export diffForEachFileCb
+func diffForEachFileCb(delta *C.git_diff_delta, progress C.float, payload unsafe.Pointer) int {
+	ch := *(*chan *DiffDelta)(payload)
+
+	select {
+	case ch <-&DiffDelta{*delta}:
+	case <-ch:
+		return -1
+	}
+
+	return 0
+}
+
+func (diff *Diff) forEachHunkWrap(ch chan *DiffHunk) {
+	C._go_git_diff_foreach(diff.ptr, 0, 1, 0, unsafe.Pointer(&ch))
+	close(ch)
+}
+
+func (diff *Diff) ForEachHunk() chan *DiffHunk {
+	ch := make(chan *DiffHunk, 0)
+	go diff.forEachHunkWrap(ch)
+	return ch
+}
+
+//export diffForEachHunkCb
+func diffForEachHunkCb(delta *C.git_diff_delta, hunk *C.git_diff_hunk, payload unsafe.Pointer) int {
+	ch := *(*chan *DiffHunk)(payload)
+
+	select {
+	case ch <-&DiffHunk{*hunk, DiffDelta{*delta}}:
+	case <-ch:
+		return -1
+	}
+
+	return 0
+}
+
+func (diff *Diff) forEachLineWrap(ch chan *DiffLine) {
+	C._go_git_diff_foreach(diff.ptr, 0, 0, 1, unsafe.Pointer(&ch))
+	close(ch)
+}
+
+func (diff *Diff) ForEachLine() chan *DiffLine {
+	ch := make(chan *DiffLine, 0)
+	go diff.forEachLineWrap(ch)
+	return ch
+}
+
+//export diffForEachLineCb
+func diffForEachLineCb(delta *C.git_diff_delta, hunk *C.git_diff_hunk, line *C.git_diff_line, payload unsafe.Pointer) int {
+	ch := *(*chan *DiffLine)(payload)
+
+	select {
+	case ch <-&DiffLine{*line, DiffHunk{*hunk, DiffDelta{*delta}}}:
+	case <-ch:
+		return -1
+	}
+
+	return 0
+}
+
+func (diff *Diff) NumDeltas() int {
+	return int(C.git_diff_num_deltas(diff.ptr))
+}
+
+func (diff *Diff) GetDelta(index int) *DiffDelta {
+	ptr := C.git_diff_get_delta(diff.ptr, C.size_t(index))
+	if ptr == nil {
+		return nil
+	}
+
+	return &DiffDelta{*ptr}
+}
+
+func (diff *Diff) Patch(deltaIndex int) *Patch {
+	var patchPtr *C.git_patch
+
+	C.git_patch_from_diff(&patchPtr, diff.ptr, C.size_t(deltaIndex))
+
+	return newPatch(patchPtr)
+}