Add basic username completion.

We need to get users into the store, though.

src/components/post_status_form/post_status_form.js

@@ -1,8 +1,10 @@
 import statusPoster from '../../services/status_poster/status_poster.service.js'
 import MediaUpload from '../media_upload/media_upload.vue'
 import fileTypeService from '../../services/file_type/file_type.service.js'
+import Tribute from '../../../node_modules/tributejs/src/Tribute.js'
+require('../../../node_modules/tributejs/scss/tribute.scss')
 
-import { reject, map, uniqBy } from 'lodash'
+import { merge, reject, map, uniqBy } from 'lodash'
 
 const buildMentionsString = ({user, attentions}, currentUser) => {
   let allAttentions = [...attentions]
@@ -19,6 +21,51 @@ const buildMentionsString = ({user, attentions}, currentUser) => {
   return mentions.join(' ') + ' '
 }
 
+const defaultCollection = {
+  // symbol that starts the lookup
+  trigger: '@',
+
+  // element to target for @mentions
+  iframe: null,
+
+  // class added in the flyout menu for active item
+  selectClass: 'highlight',
+
+  // function called on select that returns the content to insert
+  selectTemplate: function (item) {
+    return '@' + item.original.screen_name
+  },
+
+  // template for displaying item in menu
+  menuItemTemplate: function (item) {
+    return `<img src="${item.original.profile_image_url}"></img> <div class='name'>${item.string}</div>`
+  },
+
+  // template for when no match is found (optional),
+  // If no template is provided, menu is hidden.
+  noMatchTemplate: null,
+
+  // specify an alternative parent container for the menu
+  menuContainer: document.body,
+
+  // column to search against in the object (accepts function or string)
+  lookup: 'name',
+
+  // column that contains the content to insert by default
+  fillAttr: 'screen_name',
+
+  // REQUIRED: array of objects to match
+  values: [],
+
+  // specify whether a space is required before the trigger character
+  requireLeadingSpace: true,
+
+  // specify whether a space is allowed in the middle of mentions
+  allowSpaces: false
+}
+
+const tribute = new Tribute({ collection: [] })
+
 const PostStatusForm = {
   props: [
     'replyTo',
@@ -44,6 +91,24 @@ const PostStatusForm = {
       }
     }
   },
+  computed: {
+    completions () {
+      let users = map(this.$store.state.statuses.allStatuses, 'user')
+      users = uniqBy(users, 'id')
+      users = merge({values: users}, defaultCollection)
+      return [users]
+    }
+  },
+  watch: {
+    completions () {
+      tribute.collection = this.completions
+    }
+  },
+  mounted () {
+    const textarea = this.$el.querySelector('textarea')
+    tribute.collection = this.completions
+    tribute.attach(textarea)
+  },
   methods: {
     postStatus (newStatus) {
       statusPoster.postStatus({

src/components/post_status_form/post_status_form.vue

@@ -24,6 +24,22 @@
 <script src="./post_status_form.js"></script>
 
 <style lang="scss">
+ .tribute-container {
+   ul {
+     padding: 0px;
+     li {
+       display: flex;
+       align-items: center;
+     }
+   }
+   img {
+     padding: 3px;
+     width: 16px;
+     height: 16px;
+     border-radius: 50%;
+   }
+ }
+
  .post-status-form, .login {
      .form-bottom {
          display: flex;