implemented api for diff annotations

scm-ui-components/packages/ui-components/src/repos/diffs.js

@@ -0,0 +1,18 @@
+// @flow
+import type { BaseContext, File, Hunk } from "./DiffTypes";
+
+export function getPath(file: File) {
+  if (file.type === "delete") {
+    return file.oldPath;
+  }
+  return file.newPath;
+}
+
+export function createHunkIdentifier(file: File, hunk: Hunk) {
+  const path = getPath(file);
+  return `${file.type}_${path}_${hunk.content}`;
+}
+
+export function createHunkIdentifierFromContext(ctx: BaseContext) {
+  return createHunkIdentifier(ctx.file, ctx.hunk);
+}