1 files changed, 23 insertions, 0 deletions

diff --git a/app/assets/javascripts/blame/blame_redirect.js b/app/assets/javascripts/blame/blame_redirect.js
new file mode 100644
index 00000000000..155e2a3a2cd
--- /dev/null
+++ b/app/assets/javascripts/blame/blame_redirect.js
@@ -0,0 +1,23 @@
+import { setUrlParams } from '~/lib/utils/url_utility';
+import { createAlert } from '~/flash';
+import { __ } from '~/locale';
+
+export default function redirectToCorrectBlamePage() {
+  const { hash } = window.location;
+  const linesPerPage = parseInt(document.querySelector('.js-per-page').dataset.perPage, 10);
+  const params = new URLSearchParams(window.location.search);
+  const currentPage = parseInt(params.get('page'), 10);
+  const isPaginationDisabled = params.get('no_pagination');
+  if (hash && linesPerPage && !isPaginationDisabled) {
+    const lineNumber = parseInt(hash.split('#L')[1], 10);
+    const pageToRedirect = Math.ceil(lineNumber / linesPerPage);
+    const isRedirectNeeded =
+      (pageToRedirect > 1 && pageToRedirect !== currentPage) || pageToRedirect < currentPage;
+    if (isRedirectNeeded) {
+      createAlert({
+        message: __('Please wait a few moments while we load the file history for this line.'),
+      });
+      window.location.href = setUrlParams({ page: pageToRedirect });
+    }
+  }
+}