Can add topic templates to categories, prepopulated on compose

app/assets/javascripts/discourse/components/category-panel-base.js.es6

@@ -0,0 +1,11 @@
+const CategoryPanelBase = Ember.Component.extend({
+  classNameBindings: [':modal-tab', 'activeTab::invisible'],
+});
+
+export default CategoryPanelBase;
+
+export function buildCategoryPanel(tab, extras) {
+  return CategoryPanelBase.extend({
+    activeTab: Ember.computed.equal('selectedTab', tab)
+  }, extras || {});
+}

app/assets/javascripts/discourse/components/edit-category-tab.js.es6

@@ -1,12 +1,19 @@
 export default Em.Component.extend({
   tagName: 'li',
-  classNameBindings: ['active'],
+  classNameBindings: ['active', 'tabClassName'],
+
+  tabClassName: function() {
+    return 'edit-category-' + this.get('tab');
+  }.property('tab'),
 
   active: Discourse.computed.propertyEqual('selectedTab', 'tab'),
-  title: Discourse.computed.i18n('tab', 'category.%@'),
+
+  title: function() {
+    return I18n.t('category.' + this.get('tab').replace('-', '_'));
+  }.property('tab'),
 
   _addToCollection: function() {
-    this.get('panels').addObject('edit-category-' + this.get('tab'));
+    this.get('panels').addObject(this.get('tabClassName'));
   }.on('didInsertElement'),
 
   actions: {

app/assets/javascripts/discourse/components/edit-category-topic-template.js.es6

@@ -0,0 +1,11 @@
+import { buildCategoryPanel } from 'discourse/components/edit-category-panel';
+
+export default buildCategoryPanel('topic-template', {
+  _activeTabChanged: function() {
+    if (this.get('activeTab')) {
+      Ember.run.schedule('afterRender', function() {
+        $('#wmd-input').focus();
+      });
+    }
+  }.observes('activeTab')
+});

app/assets/javascripts/discourse/models/category.js

@@ -76,7 +76,8 @@ Discourse.Category = Discourse.Model.extend({
         logo_url: this.get('logo_url'),
         background_url: this.get('background_url'),
         allow_badges: this.get('allow_badges'),
-        custom_fields: this.get('custom_fields')
+        custom_fields: this.get('custom_fields'),
+        topic_template: this.get('topic_template')
       },
       type: this.get('id') ? 'PUT' : 'POST'
     });

app/assets/javascripts/discourse/models/composer.js.es6

@@ -346,13 +346,24 @@ const Composer = RestModel.extend({
       }
     }
 
+    const categoryId = opts.categoryId || this.get('topic.category.id');
     this.setProperties({
-      categoryId: opts.categoryId || this.get('topic.category.id'),
+      categoryId,
       archetypeId: opts.archetypeId || this.site.get('default_archetype'),
       metaData: opts.metaData ? Em.Object.create(opts.metaData) : null,
       reply: opts.reply || this.get("reply") || ""
     });
 
+    if (opts.action === CREATE_TOPIC && categoryId) {
+      const category = this.site.categories.find((c) => c.get('id') === categoryId);
+      if (category) {
+        const topicTemplate = category.get('topic_template');
+        if (!Ember.isEmpty(topicTemplate)) {
+          this.set('reply', topicTemplate);
+        }
+      }
+    }
+
     if (opts.postId) {
       this.set('loading', true);
       this.store.find('post', opts.postId).then(function(post) {

app/assets/javascripts/discourse/templates/components/edit-category-panel.hbs

@@ -0,0 +1 @@
+{{component customComponent tab=tab selectedTab=selectedTab category=category}}

app/assets/javascripts/discourse/templates/components/edit-category-topic-template.hbs

@@ -0,0 +1,2 @@
+<label>{{i18n 'category.topic_template'}}</label>
+{{pagedown-editor value=category.topic_template}}

app/assets/javascripts/discourse/templates/modal/edit-category.hbs

@@ -6,6 +6,7 @@
     {{/unless}}
     {{edit-category-tab panels=panels selectedTab=selectedTab tab="settings"}}
     {{edit-category-tab panels=panels selectedTab=selectedTab tab="images"}}
+    {{edit-category-tab panels=panels selectedTab=selectedTab tab="topic-template"}}
   </ul>
 
   <div class="modal-body">

app/assets/stylesheets/common/base/modal.scss

@@ -102,8 +102,20 @@
   clear: both;
 }
 
+.modal.edit-category-modal {
+  .modal-body {
+    #pagedown-editor {
+      width: 98%;
+    }
+
+    textarea {
+      height: 10em;
+    }
+  }
+}
+
 .modal {
-    .nav {
+  .nav {
     padding: 10px 30px 10px 15px;
     background-color: dark-light-diff($secondary, $primary, 10%, -15%);
     li > a {

app/assets/stylesheets/desktop/modal.scss

@@ -151,6 +151,7 @@
 
 .modal-tab {
   position: absolute;
+  width: 95%;
 }
 
 .split-modal {

app/controllers/categories_controller.rb

@@ -146,6 +146,7 @@ class CategoriesController < ApplicationController
                         :background_url,
                         :allow_badges,
                         :slug,
+                        :topic_template,
                         :custom_fields => [params[:custom_fields].try(:keys)],
                         :permissions => [*p.try(:keys)])
       end

app/serializers/basic_category_serializer.rb

@@ -16,7 +16,8 @@ class BasicCategorySerializer < ApplicationSerializer
              :notification_level,
              :logo_url,
              :background_url,
-             :can_edit
+             :can_edit,
+             :topic_template
 
   def include_parent_category_id?
     parent_category_id

config/locales/client.en.yml

@@ -1417,6 +1417,7 @@ en:
       view: 'View Topics in Category'
       general: 'General'
       settings: 'Settings'
+      topic_template: "Topic Template"
       delete: 'Delete Category'
       create: 'New Category'
       save: 'Save Category'

db/migrate/20150702201926_add_topic_template_to_categories.rb

@@ -0,0 +1,5 @@
+class AddTopicTemplateToCategories < ActiveRecord::Migration
+  def change
+    add_column :categories, :topic_template, :text, null: true
+  end
+end

test/javascripts/acceptance/category-edit-test.js.es6

@@ -27,3 +27,16 @@ test("Change the category color", (assert) => {
     assert.equal(Discourse.URL.redirectedTo, '/c/bug', 'it does one of the rare full page redirects');
   });
 });
+
+test("Change the topic template", (assert) => {
+  visit("/c/bug");
+
+  click('.edit-category');
+  click('.edit-category-topic-template');
+  fillIn('#wmd-input', 'this is the new topic template');
+  click('#save-category');
+  andThen(() => {
+    assert.ok(!visible('#discourse-modal'), 'it closes the modal');
+    assert.equal(Discourse.URL.redirectedTo, '/c/bug', 'it does one of the rare full page redirects');
+  });
+});