History: sortable column headers with client-side sort (#42)

web/templates/history.html

@@ -9,7 +9,15 @@
   <div class="float">
     <table>
       <colgroup><col style="width:260px"><col style="width:140px"><col style="width:120px"><col style="width:96px"><col style="width:140px"><col style="width:190px"><col style="width:100px"></colgroup>
-      <thead><tr><th>Paste</th><th>Language</th><th>Size</th><th>Views</th><th>Created</th><th>URL</th><th>ID</th></tr></thead>
+      <thead><tr>
+        <th data-sort="title" class="sortable">Paste<span class="sort-ind"></span></th>
+        <th data-sort="language" class="sortable">Language<span class="sort-ind"></span></th>
+        <th data-sort="size" class="sortable">Size<span class="sort-ind"></span></th>
+        <th data-sort="view_count" class="sortable">Views<span class="sort-ind"></span></th>
+        <th data-sort="created_at" class="sortable">Created<span class="sort-ind"></span></th>
+        <th data-sort="custom_slug" class="sortable">URL<span class="sort-ind"></span></th>
+        <th data-sort="id" class="sortable">ID<span class="sort-ind"></span></th>
+      </tr></thead>
       <tbody id="rows"></tbody>
     </table>
     <div class="empty" id="empty" style="display:none">No pastes yet. Create the first one.</div>
@@ -35,6 +43,44 @@ function ago(ts) {
 }
 
 let filter = '';
+let sortKey = null, sortDir = 1;
+
+const sortVal = (it, k) => {
+  let v = it[k];
+  if (k === 'title' || k === 'custom_slug') v = (v == null || v === '') ? null : String(v).toLowerCase();
+  if (k === 'language') v = (v == null || v === '') ? 'text' : String(v).toLowerCase();
+  if (k === 'size' || k === 'view_count' || k === 'created_at') return v == null ? -1 : v;
+  return v == null ? null : v;
+};
+function sortItems(items) {
+  if (!sortKey) return items;
+  const k = sortKey;
+  return items.slice().sort((a, b) => {
+    let va = sortVal(a, k), vb = sortVal(b, k);
+    const na = va == null, nb = vb == null;
+    if (na && nb) return 0;
+    if (na) return 1;            // nulls always last
+    if (nb) return -1;
+    if (va < vb) return -1 * sortDir;
+    if (va > vb) return 1 * sortDir;
+    return (a.created_at || 0) < (b.created_at || 0) ? 1 : -1; // stable tiebreak: newest first
+  });
+}
+function renderSortIndicators() {
+  document.querySelectorAll('th.sortable').forEach(th => {
+    th.classList.toggle('sorted', th.dataset.sort === sortKey);
+    th.classList.toggle('asc', th.dataset.sort === sortKey && sortDir === 1);
+    th.classList.toggle('desc', th.dataset.sort === sortKey && sortDir === -1);
+  });
+}
+document.querySelector('thead').addEventListener('click', e => {
+  const th = e.target.closest('th.sortable');
+  if (!th) return;
+  const k = th.dataset.sort;
+  if (sortKey === k) { sortDir = -sortDir; } else { sortKey = k; sortDir = 1; }
+  renderSortIndicators();
+  load();
+});
 
 function matchesFilter(it) {
   if (!filter) return true;
@@ -48,14 +94,15 @@ async function load() {
   try {
   const filtered = filter.length > 0;
   const off = (page - 1) * PER;
-  const url = filtered
-    ? '/api/public?limit=200&offset=0'
+  const url = (filtered || sortKey)
+    ? '/api/public?limit=500&offset=0'
     : '/api/public?limit=' + PER + '&offset=' + off;
   const res = await fetch(url);
   const data = await res.json();
   total = data.total;
 
-  const items = filtered ? data.items.filter(matchesFilter) : data.items;
+  let items = filtered ? data.items.filter(matchesFilter) : data.items;
+  items = sortItems(items);
 
   $('count').textContent = filtered
     ? items.length.toLocaleString() + ' matches (of ' + total.toLocaleString() + ' total)'
@@ -78,8 +125,10 @@ async function load() {
   }
 
   const pages = Math.max(1, Math.ceil(total / PER));
-  if (filtered) {
-    $('showing').textContent = 'Showing ' + items.length.toLocaleString() + ' matches for "' + filter + '"';
+  if (filtered || sortKey) {
+    $('showing').textContent = sortKey
+      ? 'Sorted by ' + sortKey + ' (' + (sortDir === 1 ? 'ascending' : 'descending') + ') · ' + items.length.toLocaleString() + ' of ' + total.toLocaleString()
+      : 'Showing ' + items.length.toLocaleString() + ' matches for "' + filter + '"';
     $('pg').innerHTML = '';
   } else {
     $('showing').textContent = total === 0 ? 'Nothing here yet' :
@@ -100,6 +149,7 @@ async function load() {
     add('›', page+1, {dis: page===pages});
     $('pg').innerHTML = btns.join('');
   }
+  renderSortIndicators();
   } finally {
     spinner.style.visibility = 'hidden';
   }