Improve async/await usage, and sort init calls in index.js (#17386)

* clean up async/await, and sort init calls in `index.js
* use `const _promise` to indicate that we do not need await an async function

web_src/js/features/repo-commit.js

@@ -1,6 +1,47 @@
+const {csrfToken} = window.config;
+
 export function initRepoCommitButton() {
   $('.commit-button').on('click', function (e) {
     e.preventDefault();
     $(this).parent().find('.commit-body').toggle();
   });
 }
+
+export function initRepoCommitLastCommitLoader() {
+  const entryMap = {};
+
+  const entries = $('table#repo-files-table tr.notready')
+    .map((_, v) => {
+      entryMap[$(v).attr('data-entryname')] = $(v);
+      return $(v).attr('data-entryname');
+    })
+    .get();
+
+  if (entries.length === 0) {
+    return;
+  }
+
+  const lastCommitLoaderURL = $('table#repo-files-table').data('lastCommitLoaderUrl');
+
+  if (entries.length > 200) {
+    $.post(lastCommitLoaderURL, {
+      _csrf: csrfToken,
+    }, (data) => {
+      $('table#repo-files-table').replaceWith(data);
+    });
+    return;
+  }
+
+  $.post(lastCommitLoaderURL, {
+    _csrf: csrfToken,
+    'f': entries,
+  }, (data) => {
+    $(data).find('tr').each((_, row) => {
+      if (row.className === 'commit-list') {
+        $('table#repo-files-table .commit-list').replaceWith(row);
+        return;
+      }
+      entryMap[$(row).attr('data-entryname')].replaceWith(row);
+    });
+  });
+}