Include more options for continuing search in error tmpl

The error template previously only included the option to continue a
user's search via Farside (whoogle or searxng), and would only appear
when an instance was ratelimited. This has been updated to display
anytime an exception has occurred, and now includes other options for
continuing a search, such as Kagi, DDG, Brave, Ecosia, etc.

Closes #1099

app/routes.py

@@ -609,6 +609,26 @@ def page_not_found(e):
     return render_template('error.html', error_message=str(e)), 404
 
 
+@app.errorhandler(Exception)
+def internal_error(e):
+    query = ''
+    if request.method == 'POST':
+        query = request.form.get('q')
+    else:
+        query = request.args.get('q')
+
+    localization_lang = g.user_config.get_localization_lang()
+    translation = app.config['TRANSLATIONS'][localization_lang]
+    return render_template(
+            'error.html',
+            error_message='Internal server error (500)',
+            translation=translation,
+            farside='https://farside.link',
+            config=g.user_config,
+            query=urlparse.unquote(query),
+            params=g.user_config.to_params(keys=['preferences'])), 500
+
+
 def run_app() -> None:
     parser = argparse.ArgumentParser(
         description='Whoogle Search console runner')

app/templates/error.html

@@ -20,21 +20,86 @@
     </p>
     <hr>
     <p>
-    {% if blocked is defined %}
         <h4><a class="link" href="https://farside.link">{{ translation['continue-search'] }}</a></h4>
-        Whoogle:
-        <br>
-        <a class="link-color" href="{{farside}}/whoogle/search?q={{query}}{{params}}">
-            {{farside}}/whoogle/search?q={{query}}
-        </a>
-        <br><br>
-        Searx:
-        <br>
-        <a class="link-color" href="{{farside}}/searx/search?q={{query}}">
-            {{farside}}/searx/search?q={{query}}
-        </a>
+        <ul>
+            <li>
+                <a href="https://github.com/benbusby/whoogle-search">Whoogle</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="{{farside}}/whoogle/search?q={{query}}{{params}}">
+                            {{farside}}/whoogle/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            <li>
+                <a href="https://github.com/searxng/searxng">SearXNG</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="{{farside}}/searxng/search?q={{query}}">
+                            {{farside}}/searxng/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+        </ul>
+        <hr>
+        <h4>Other options:</h4>
+        <ul>
+            <li>
+                <a href="https://kagi.com">Kagi</a>
+                <ul>
+                    <li>Recommended by Whoogle maintainer</li>
+                    <li>Requires account</li>
+                    <li>
+                        <a class="link-color" href="https://kagi.com/search?q={{query}}">
+                            kagi.com/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            <li>
+                <a href="https://duckduckgo.com">DuckDuckGo</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="https://duckduckgo.com/search?q={{query}}">
+                            duckduckgo.com/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            <li>
+                <a href="https://search.brave.com">Brave Search</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="https://search.brave.com/search?q={{query}}">
+                            search.brave.com/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            <li>
+                <a href="https://ecosia.com">Ecosia</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="https://ecosia.com/search?q={{query}}">
+                            ecosia.com/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+            <li>
+                <a href="https://google.com">Google</a>
+                <ul>
+                    <li>
+                        <a class="link-color" href="https://google.com/search?q={{query}}">
+                            google.com/search?q={{query}}
+                        </a>
+                    </li>
+                </ul>
+            </li>
+        </ul>
         <hr>
-    {% endif %}
     </p>
     <a class="link" href="home">Return Home</a>
 </div>