Move search form to macro, remove button border

tildes/tildes/templates/home.jinja2

@@ -1,5 +1,7 @@
 {% extends 'topic_listing.jinja2' %}
 
+{% from 'macros/forms.jinja2' import search_form %}
+
 {% block title_full %}Tildes{% endblock %}
 
 {% block header_context_link %}{% endblock %}
@@ -17,12 +19,7 @@
 {% endblock %}
 
 {% block sidebar %}
-  <form class="form-search" method="GET" action="/search">
-    <div class="input-group">
-      <input type="text" class="form-input input-sm" name="q" id="q">
-      <button class="btn btn-sm input-group-btn">Search</button>
-    </div>
-  </form>
+  {{ search_form() }}
 
   <h2>Home</h2>
   <p>The home page shows topics from groups that you're subscribed to.</p>

tildes/tildes/templates/macros/forms.jinja2

@@ -29,3 +29,18 @@
     >
   </div>
 {% endmacro %}
+
+{% macro search_form(existing_query=None) %}
+  <form class="form-search" method="GET" action="/search">
+    <div class="input-group">
+      <input
+        type="text"
+        class="form-input input-sm"
+        name="q"
+        id="q"
+        {% if existing_query %}value="{{ existing_query }}"{% endif %}
+      >
+      <button class="btn btn-sm btn-link">Search</button>
+    </div>
+  </form>
+{% endmacro %}

tildes/tildes/templates/search.jinja2

@@ -1,16 +1,13 @@
 {% extends 'topic_listing.jinja2' %}
 
+{% from 'macros/forms.jinja2' import search_form %}
+
 {% block title %}Search results for "{{ search }}"{% endblock %}
 
 {% block header_context_link %}<span class="site-header-context">Search: "{{ search }}"</span>{% endblock %}
 
 {% block sidebar %}
-  <form class="form-search" method="GET" action="/search">
-    <div class="input-group">
-      <input type="text" class="form-input input-sm" name="q" id="q" value="{{ search }}">
-      <button class="btn btn-sm input-group-btn">Search</button>
-    </div>
-  </form>
+  {{ search_form(search) }}
 
   <h2>Search results</h2>
 

tildes/tildes/templates/topic_listing.jinja2

@@ -1,5 +1,6 @@
 {% extends 'base.jinja2' %}
 
+{% from 'macros/forms.jinja2' import search_form %}
 {% from 'macros/groups.jinja2' import render_group_subscription_box with context %}
 {% from 'macros/topics.jinja2' import render_topic_for_listing with context %}
 
@@ -175,12 +176,7 @@
 {% endblock %}
 
 {% block sidebar %}
-  <form class="form-search" method="GET" action="/search">
-    <div class="input-group">
-      <input type="text" class="form-input input-sm" name="q" id="q">
-      <button class="btn btn-sm input-group-btn">Search</button>
-    </div>
-  </form>
+  {{ search_form() }}
 
   <h3>~{{ group.path }}</h3>