Add git_diff_buffers

diff.go

@@ -7,6 +7,8 @@ extern void _go_git_populate_apply_callbacks(git_apply_options *options);
 extern int _go_git_diff_foreach(git_diff *diff, int eachFile, int eachHunk, int eachLine, void *payload);
 extern void _go_git_setup_diff_notify_callbacks(git_diff_options* opts);
 extern int _go_git_diff_blobs(git_blob *old, const char *old_path, git_blob *new, const char *new_path, git_diff_options *opts, int eachFile, int eachHunk, int eachLine, void *payload);
+extern int _go_git_diff_buffers(const void *old_buffer, size_t old_len, const char *old_as_path, const void *new_buffer, size_t new_len, const char *new_as_path, const git_diff_options *opts, int eachFile, int eachHunk, int eachLine, void *payload);
+
 */
 import "C"
 import (
@@ -888,6 +890,55 @@ func DiffBlobs(oldBlob *Blob, oldAsPath string, newBlob *Blob, newAsPath string,
 	return nil
 }
 
+// DiffBuffers performs a diff between two arbitrary buffers. You can pass
+// whatever file names you'd like for them to appear as in the diff.
+func DiffBuffers(oldBuffer []byte, oldAsPath string, newBufer []byte, newAsPath string, opts *DiffOptions, fileCallback DiffForEachFileCallback, detail DiffDetail) error {
+	var err error
+	data := &diffForEachCallbackData{
+		fileCallback: fileCallback,
+		errorTarget:  &err,
+	}
+
+	intHunks := C.int(0)
+	if detail >= DiffDetailHunks {
+		intHunks = C.int(1)
+	}
+
+	intLines := C.int(0)
+	if detail >= DiffDetailLines {
+		intLines = C.int(1)
+	}
+
+	handle := pointerHandles.Track(data)
+	defer pointerHandles.Untrack(handle)
+
+	cOldBuffer := C.CBytes(oldBuffer)
+	defer C.free(unsafe.Pointer(cOldBuffer))
+	cNewBuffer := C.CBytes(newBufer)
+	defer C.free(unsafe.Pointer(cNewBuffer))
+
+	cOldAsPath := C.CString(oldAsPath)
+	defer C.free(unsafe.Pointer(cOldAsPath))
+	cNewAsPath := C.CString(newAsPath)
+	defer C.free(unsafe.Pointer(cNewAsPath))
+
+	copts := populateDiffOptions(&C.git_diff_options{}, opts, nil, &err)
+	defer freeDiffOptions(copts)
+
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
+
+	ret := C._go_git_diff_buffers(cOldBuffer, C.size_t(len(oldBuffer)), cOldAsPath, cNewBuffer, C.size_t(len(newBufer)), cNewAsPath, copts, 1, intHunks, intLines, handle)
+	if ret == C.int(ErrorCodeUser) && err != nil {
+		return err
+	}
+	if ret < 0 {
+		return MakeGitError(ret)
+	}
+
+	return nil
+}
+
 // ApplyHunkCallback is a callback that will be made per delta (file) when applying a patch.
 type ApplyHunkCallback func(*DiffHunk) (apply bool, err error)
 

wrapper.c

@@ -234,6 +234,34 @@ int _go_git_diff_blobs(
 	return git_diff_blobs(old, old_path, new, new_path, opts, fcb, NULL, hcb, lcb, payload);
 }
 
+int _go_git_diff_buffers(
+		const void *old_buffer,
+		size_t old_len,
+		const char *old_as_path,
+		const void *new_buffer,
+		size_t new_len,
+		const char *new_as_path,
+		const git_diff_options *opts,
+		int eachFile,
+		int eachHunk,
+		int eachLine,
+		void *payload)
+{
+	git_diff_file_cb fcb = NULL;
+	git_diff_hunk_cb hcb = NULL;
+	git_diff_line_cb lcb = NULL;
+
+	if (eachFile)
+		fcb = (git_diff_file_cb)&diffForEachFileCallback;
+	if (eachHunk)
+		hcb = (git_diff_hunk_cb)&diffForEachHunkCallback;
+	if (eachLine)
+		lcb = (git_diff_line_cb)&diffForEachLineCallback;
+
+	return git_diff_buffers(old_buffer, old_len, old_as_path, new_buffer, new_len, new_as_path, opts, fcb, NULL, hcb, lcb, payload);
+}
+
+
 void _go_git_setup_diff_notify_callbacks(git_diff_options *opts)
 {
 	opts->notify_cb = (git_diff_notify_cb)&diffNotifyCallback;