Use input-group for forum topic

app/public/static/package_edit.js

@@ -22,6 +22,10 @@ $(function() {
 		}
 	});
 
+	$("#forums-button").click(function(e) {
+		window.open("https://forum.minetest.net/viewtopic.php?t=" + $("#forums").val(), "_blank");
+	});
+
 	let hint = null;
 	function showHint(ele, text) {
 		if (hint) {

app/templates/macros/forms.html

@@ -13,6 +13,53 @@
 	</div>
 {%- endmacro %}
 
+{% macro render_field_prefix(field, label=None, prefix="@", label_visible=true, right_url=None, right_label=None, fieldclass=None) -%}
+	<div class="form-group {% if field.errors %}has-error{% endif %} {{ kwargs.pop('class_', '') }}">
+		{% if field.type != 'HiddenField' and label_visible %}
+			{% if not label and label != "" %}{% set label=field.label.text %}{% endif %}
+			{% if label %}<label for="{{ field.id }}">{{ label|safe }}</label>{% endif %}
+		{% endif %}
+
+		<div class="input-group mb-3">
+			<div class="input-group-prepend">
+				<span class="input-group-text" id="basic-addon1">{{ prefix }}</span>
+			</div>
+			{{ field(class_=fieldclass or 'form-control', **kwargs) }}
+		</div>
+
+		{% if field.errors %}
+			{% for e in field.errors %}
+				<p class="help-block">{{ e }}</p>
+			{% endfor %}
+		{% endif %}
+	</div>
+{%- endmacro %}
+
+{% macro render_field_prefix_button(field, label=None, prefix="@", label_visible=true, right_url=None, right_label=None, fieldclass=None) -%}
+	<div class="form-group {% if field.errors %}has-error{% endif %} {{ kwargs.pop('class_', '') }}">
+		{% if field.type != 'HiddenField' and label_visible %}
+			{% if not label and label != "" %}{% set label=field.label.text %}{% endif %}
+			{% if label %}<label for="{{ field.id }}">{{ label|safe }}</label>{% endif %}
+		{% endif %}
+
+		<div class="input-group mb-3">
+			<div class="input-group-prepend">
+				<span class="input-group-text" id="basic-addon1">{{ prefix }}</span>
+			</div>
+			{{ field(class_=fieldclass or 'form-control', **kwargs) }}
+			<a class="btn btn-secondary" id="{{ field.name }}-button">
+				View
+			</a>
+		</div>
+
+		{% if field.errors %}
+			{% for e in field.errors %}
+				<p class="help-block">{{ e }}</p>
+			{% endfor %}
+		{% endif %}
+	</div>
+{%- endmacro %}
+
 {% macro form_scripts() -%}
 	<link href="/static/jquery-ui.min.css?v=2" rel="stylesheet" type="text/css">
 	<script src="/static/jquery-ui.min.js?v=2"></script>

app/templates/packages/create_edit.html

@@ -7,7 +7,8 @@
 	{% endif %}
 {% endblock %}
 
-{% from "macros/forms.html" import render_field, render_submit_field, form_scripts, render_multiselect_field, render_mpackage_field, render_deps_field, package_lists %}
+{% from "macros/forms.html" import render_field, render_field_prefix_button, render_submit_field, form_scripts,
+		render_multiselect_field, render_mpackage_field, render_deps_field, package_lists %}
 
 {% block scriptextra %}
 	{{ form_scripts() }}
@@ -16,7 +17,7 @@
 		<script src="/static/polltask.js"></script>
 		<script src="/static/package_create.js?v=4"></script>
 	{% endif %}
-	<script src="/static/package_edit.js?v=3"></script>
+	<script src="/static/package_edit.js?v=4"></script>
 {% endblock %}
 
 {% block content %}
@@ -114,9 +115,12 @@
 
 			{{ render_field(form.website, class_="pkg_meta") }}
 			{{ render_field(form.issueTracker, class_="pkg_meta") }}
-			{{ render_field(form.forums, class_="pkg_meta", placeholder=_("Tip: paste in a forum topic URL")) }}
+			{{ render_field_prefix_button(form.forums, class_="pkg_meta",
+				pattern="[0-9]+",
+				prefix=_("forum.minetest.net/viewtopic.php?t="),
+				placeholder=_("Tip: paste in a forum topic URL")) }}
 		</fieldset>
 
-		<div class="pkg_meta">{{ render_submit_field(form.submit) }}</div>
+		<div class="pkg_meta mt-5">{{ render_submit_field(form.submit) }}</div>
 	</form>
 {% endblock %}

app/templates/users/profile_edit.html

@@ -44,14 +44,14 @@
 
 <h3>{{ _("Profile Information") }}</h3>
 
-{% from "macros/forms.html" import render_field, render_submit_field %}
+{% from "macros/forms.html" import render_field, render_field_prefix, render_submit_field %}
 <form action="" method="POST" class="form" role="form">
 	{{ form.hidden_tag() }}
 
 	{% if user.checkPerm(current_user, "CHANGE_USERNAMES") %}
 		{{ render_field(form.display_name, tabindex=230) }}
 		{{ render_field(form.forums_username, tabindex=230) }}
-		{{ render_field(form.github_username, tabindex=230) }}
+		{{ render_field_prefix(form.github_username, tabindex=230) }}
 	{% endif %}
 
 	{% if user.checkPerm(current_user, "CHANGE_PROFILE_URLS") %}