feat: display whether or not the instance is up to date on error (#310)

static/check_update.js

@@ -0,0 +1,38 @@
+async function checkInstanceUpdateStatus() {
+    try {
+        const response = await fetch('/commits.atom');
+        const text = await response.text();
+        const parser = new DOMParser();
+        const xmlDoc = parser.parseFromString(text, "application/xml");
+        const entries = xmlDoc.getElementsByTagName('entry');
+        const localCommit = document.getElementById('git_commit').dataset.value;
+
+        let statusMessage = '';
+
+        if (entries.length > 0) {
+            const commitHashes = Array.from(entries).map(entry => {
+                const id = entry.getElementsByTagName('id')[0].textContent;
+                return id.split('/').pop();
+            });
+
+            const commitIndex = commitHashes.indexOf(localCommit);
+
+            if (commitIndex === 0) {
+                statusMessage = '✅ Instance is up to date.';
+            } else if (commitIndex > 0) {
+                statusMessage = `⚠️ This instance is not up to date and is ${commitIndex} commits old. Test and confirm on an up-to-date instance before reporting.`;
+            } else {
+                statusMessage = `⚠️ This instance is not up to date and is at least ${commitHashes.length} commits old. Test and confirm on an up-to-date instance before reporting.`;
+            }
+        } else {
+            statusMessage = '⚠️ Unable to fetch commit information.';
+        }
+
+        document.getElementById('update-status').innerText = statusMessage;
+    } catch (error) {
+        console.error('Error fetching commits:', error);
+        document.getElementById('update-status').innerText = '⚠️ Error checking update status.';
+    }
+}
+
+checkInstanceUpdateStatus();