Prefill release notes URL field (#2828)

Author: hugovk

downloads/admin.py

@@ -31,3 +31,6 @@ def formfield_for_dbfield(self, db_field, request, **kwargs):
         if db_field.name == "name":
             field.widget.attrs["placeholder"] = "Python 3.X.YaN"
         return field
+
+    class Media:
+        js = ["js/admin/releaseAdmin.js"]

static/js/admin/releaseAdmin.js

@@ -0,0 +1,53 @@
+'use strict';
+
+function generateReleaseNotesUrl(name) {
+    // Match "Python X.Y.Z[aN]"
+    const match = name.match(/^Python (\d+)\.(\d+)\.(\d+)((?:a|b|rc)\d*)?$/);
+    if (!match) {
+        return '';
+    }
+
+    const major = match[1];
+    const minor = match[2];
+    const patch = match[3];
+    const prerelease = match[4];  // e.g., "a2", "b1", "rc1" or undefined
+
+    if (prerelease) {
+        // Prerelease: https://docs.python.org/3.15/whatsnew/3.15.html
+        return `https://docs.python.org/${major}.${minor}/whatsnew/${major}.${minor}.html`;
+    } else {
+        // Regular release: https://docs.python.org/release/3.13.9/whatsnew/changelog.html
+        return `https://docs.python.org/release/${major}.${minor}.${patch}/whatsnew/changelog.html`;
+    }
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+    // Only run on add page, not edit
+    if (!window.location.pathname.endsWith('/add/')) {
+        return;
+    }
+
+    const nameField = document.getElementById('id_name');
+    const releaseNotesUrlField = document.getElementById('id_release_notes_url');
+
+    if (!nameField || !releaseNotesUrlField) {
+        return;
+    }
+
+    // Track if user has manually edited the field
+    let changed = false;
+    releaseNotesUrlField.addEventListener('change', function() {
+        changed = true;
+    });
+
+    nameField.addEventListener('keyup', populate);
+    nameField.addEventListener('change', populate);
+    nameField.addEventListener('focus', populate);
+
+    function populate() {
+        if (changed) {
+            return;
+        }
+        releaseNotesUrlField.value = generateReleaseNotesUrl(nameField.value);
+    }
+});