[PATCH 1/3] messages: clean up messages and errors containers

[Raxel Gutierrez]

Refactor the messages container to make use of message.tags [1] which
allows for more customization for each level (e.g. success, warning,
error, etc.) of a message through CSS selectors. As basic proof of
concept, customize the text color of each existing message level. Also,
this addition resolves a TODO by stephenfin in the previous code.

Modularize the errors container with a new partial template errors.html
that makes it easier to reuse errors in various pages. These changes
make the code more readable and ready for change.

Change both the messages and errors containers to always exist in
the DOM. With this, the addition of update and error messages is simpler
because it eliminates the need to create the containers if they don't
exist. These changes will be useful in a following patch that introduces
an internal JS module to make client-side requests to the REST API.

[1] https://docs.djangoproject.com/en/3.2/ref/contrib/messages/#message-tags

Signed-off-by: Raxel Gutierrez <raxel at google.com>
---
 htdocs/css/style.css                          | 26 ++++++++++++++++---
 patchwork/templates/patchwork/list.html       | 10 +------
 .../templates/patchwork/partials/errors.html  | 10 +++++++
 patchwork/templates/patchwork/submission.html |  2 ++
 patchwork/templates/patchwork/user-link.html  |  2 +-
 templates/base.html                           | 22 +++++++++-------
 6 files changed, 49 insertions(+), 23 deletions(-)
 create mode 100644 patchwork/templates/patchwork/partials/errors.html

diff --git a/htdocs/css/style.css b/htdocs/css/style.css
index 46a91ee8..bcc57b2c 100644
--- a/htdocs/css/style.css
+++ b/htdocs/css/style.css
@@ -1,3 +1,9 @@
+:root {
+    --success-color:rgb(92, 184, 92);
+    --warning-color:rgb(240, 173, 78);
+    --danger-color:rgb(217, 83, 79);
+}
+
 h2 {
     font-size: 25px;
     margin: 18px 0 18px 0;
@@ -78,14 +84,26 @@ dl dt {
 }
 
 /* messages */
-#messages {
+.messages {
     background: #e0e0f0;
     margin: 0.5em 1em 0.0em 0.5em;
     padding: 0.3em;
 }
 
-#messages .message {
-    color: green;
+.messages:empty {
+    display: none;
+}
+
+.messages .success {
+    color: var(--success-color);
+}
+
+.messages .warning {
+    color: var(--warning-color);
+}
+
+.messages .error {
+    color: var(--danger-color);
 }
 
 .filters {
@@ -421,7 +439,7 @@ table.loginform {
 }
 
 /* form errors */
-.errorlist {
+.error-list {
     color: red;
     list-style-type: none;
     padding-left: 0.2em;
diff --git a/patchwork/templates/patchwork/list.html b/patchwork/templates/patchwork/list.html
index 5d3d82aa..91387cf0 100644
--- a/patchwork/templates/patchwork/list.html
+++ b/patchwork/templates/patchwork/list.html
@@ -8,15 +8,7 @@
 
 {% block body %}
 
-{% if errors %}
-<p>The following error{{ errors|length|pluralize:" was,s were" }} encountered
-while updating patches:</p>
-<ul class="errorlist">
-{% for error in errors %}
- <li>{{ error }}</li>
-{% endfor %}
-</ul>
-{% endif %}
+{% include "patchwork/partials/errors.html" %}
 
 {% include "patchwork/partials/patch-list.html" %}
 
diff --git a/patchwork/templates/patchwork/partials/errors.html b/patchwork/templates/patchwork/partials/errors.html
new file mode 100644
index 00000000..86eec121
--- /dev/null
+++ b/patchwork/templates/patchwork/partials/errors.html
@@ -0,0 +1,10 @@
+<div id="errors">
+    {% if errors %}
+        <p>The following error{{ errors|length|pluralize:" was,s were" }} encountered while updating patches:</p>
+        <ul class="error-list">
+        {% for error in errors %}
+            <li>{{ error }}</li>
+        {% endfor %}
+        </ul>
+    {% endif %}
+</div>
diff --git a/patchwork/templates/patchwork/submission.html b/patchwork/templates/patchwork/submission.html
index 66efa0b5..3b65f81d 100644
--- a/patchwork/templates/patchwork/submission.html
+++ b/patchwork/templates/patchwork/submission.html
@@ -14,6 +14,8 @@
 
 {% block body %}
 
+{% include "patchwork/partials/errors.html" %}
+
 <div>
   {% include "patchwork/partials/download-buttons.html" %}
   <h1>{{ submission.name }}</h1>
diff --git a/patchwork/templates/patchwork/user-link.html b/patchwork/templates/patchwork/user-link.html
index bf331520..e23e69d5 100644
--- a/patchwork/templates/patchwork/user-link.html
+++ b/patchwork/templates/patchwork/user-link.html
@@ -14,7 +14,7 @@ you.</p>
     {{ form.non_field_errors }}
    {% endif %}
    {% if error %}
-    <ul class="errorlist"><li>{{error}}</li></ul>
+    <ul class="error-list"><li>{{error}}</li></ul>
    {% endif %}
 
    <form action="{% url 'user-link' %}" method="post">
diff --git a/templates/base.html b/templates/base.html
index a95a11b0..a9d0906b 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -104,15 +104,19 @@
     </div>
    </div>
   </nav>
-{% if messages %}
-  <div id="messages">
-  {% for message in messages %}
-  {# TODO(stephenfin): Make use of message.tags when completely #}
-  {# converted to django.contrib.messages #}
-   <div class="message">{{ message }}</div>
-  {% endfor %}
-  </div>
-{% endif %}
+  <!--
+    spaceless tag is used to remove automatically added whitespace so that the container
+    is truly considered empty by the `:empty` pseudo-class that is used for styling
+  -->
+  {% spaceless %}
+  <ul class="messages">
+  {% if messages %}
+    {% for message in messages %}
+    <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
+    {% endfor %}
+  {% endif %}
+  </ul>
+  {% endspaceless %}
   <div id="main-content" class="container-fluid">
 {% block body %}
 {% endblock %}
-- 
2.33.0.rc1.237.g0d66db33f3-goog