1 files changed, 28 insertions, 0 deletions
diff --git a/app/assets/javascripts/diffs/diff_file.js b/app/assets/javascripts/diffs/diff_file.js
new file mode 100644
index 00000000000..717c4a79ef9
--- /dev/null
+++ b/app/assets/javascripts/diffs/diff_file.js
@@ -0,0 +1,28 @@
+import { DIFF_FILE_SYMLINK_MODE, DIFF_FILE_DELETED_MODE } from './constants';
+
+function fileSymlinkInformation(file, fileList) {
+  const duplicates = fileList.filter(iteratedFile => iteratedFile.file_hash === file.file_hash);
+  const includesSymlink = duplicates.some(iteratedFile => {
+    return [iteratedFile.a_mode, iteratedFile.b_mode].includes(DIFF_FILE_SYMLINK_MODE);
+  });
+  const brokenSymlinkScenario = duplicates.length > 1 && includesSymlink;
+
+  return (
+    brokenSymlinkScenario && {
+      replaced: file.b_mode === DIFF_FILE_DELETED_MODE,
+      wasSymbolic: file.a_mode === DIFF_FILE_SYMLINK_MODE,
+      isSymbolic: file.b_mode === DIFF_FILE_SYMLINK_MODE,
+      wasReal: ![DIFF_FILE_SYMLINK_MODE, DIFF_FILE_DELETED_MODE].includes(file.a_mode),
+      isReal: ![DIFF_FILE_SYMLINK_MODE, DIFF_FILE_DELETED_MODE].includes(file.b_mode),
+    }
+  );
+}
+
+/* eslint-disable-next-line import/prefer-default-export */
+export function prepareRawDiffFile({ file, allFiles }) {
+  Object.assign(file, {
+    brokenSymlink: fileSymlinkInformation(file, allFiles),
+  });
+
+  return file;
+}