Task lists WIP:

* initializing some code parts
* mechanism to add font-awesome icons to the defaults one that
  ConverseJS uses
* new way to override ConverseJS index.js (to add new custom plugins,
  that are directly build into ConverseJS)

conversejs/custom/plugins/tasks/index.js

@@ -0,0 +1,15 @@
+import { _converse, converse } from '../../../src/headless/core.js'
+import { ChatRoomTaskLists } from './task-lists.js'
+import { ChatRoomTaskList } from './task-list.js'
+import { getHeadingButtons } from './utils.js'
+
+converse.plugins.add('livechat-converse-tasks', {
+  dependencies: ['converse-muc', 'converse-disco'], // TODO: add converse-pubsub
+
+  initialize () {
+    _converse.ChatRoomTaskLists = ChatRoomTaskLists
+    _converse.ChatRoomTaskList = ChatRoomTaskList
+
+    _converse.api.listen.on('getHeadingButtons', getHeadingButtons)
+  }
+})

conversejs/custom/plugins/tasks/task-list.js

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+import { Model } from '@converse/skeletor/src/model.js'
+
+/**
+ * A chat room task list.
+ * @class
+ * @namespace _converse.ChatRoomTaskList
+ * @memberof _converse
+ */
+class ChatRoomTaskList extends Model {
+
+}
+
+export {
+  ChatRoomTaskList
+}

conversejs/custom/plugins/tasks/task-lists.js

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+import { Collection } from '@converse/skeletor/src/collection.js'
+import { ChatRoomTaskList } from './task-list'
+
+/**
+ * A list of {@link _converse.ChatRoomTaskList} instances, representing task lists associated to a MUC.
+ * @class
+ * @namespace _converse.ChatRoomTaskLists
+ * @memberOf _converse
+ */
+class ChatRoomTaskLists extends Collection {
+  model = ChatRoomTaskList
+}
+
+export {
+  ChatRoomTaskLists
+}

conversejs/custom/plugins/tasks/utils.js

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+import { _converse } from '../../../src/headless/core.js'
+import { __ } from 'i18n'
+
+export function getHeadingButtons (view, buttons) {
+  const muc = view.model
+  if (muc.get('type') !== _converse.CHATROOMS_TYPE) {
+    // only on MUC.
+    return buttons
+  }
+
+  const myself = muc.getOwnOccupant()
+  if (!myself || !myself.isModerator()) {
+    // User must be moderator
+    return buttons
+  }
+
+  // Adding a "Open task list" button.
+  buttons.unshift({
+    i18n_text: __('Tasks'),
+    handler: async (ev) => {
+      ev.preventDefault()
+      ev.stopPropagation()
+
+      // TODO.
+    },
+    a_class: '',
+    icon_class: 'fa-list', // FIXME
+    name: 'muc-tasks'
+  })
+
+  return buttons
+}