PLT-1378 Initial version of emoji reactions (#4520)

* Refactored emoji.json to support multiple aliases and emoji categories

* Added custom category to emoji.jsx and stabilized all fields

* Removed conflicting aliases for :mattermost: and :ca:

* fixup after store changes

* Added emoji reactions

* Removed reactions for an emoji when that emoji is deleted

* Fixed incorrect test case

* Renamed ReactionList to ReactionListView

* Fixed 👍 and 👎 not showing up as possible reactions

* Removed text emoticons from emoji reaction autocomplete

* Changed emoji reactions to be sorted by the order that they were first created

* Set a maximum number of listeners for the ReactionStore

* Removed unused code from Textbox component

* Fixed reaction permissions

* Changed error code when trying to modify reactions for another user

* Fixed merge conflicts

* Properly applied theme colours to reactions

* Fixed ESLint and gofmt errors

* Fixed ReactionListContainer to properly update when its post prop changes

* Removed unnecessary escape characters from reaction regexes

* Shared reaction message pattern between CreatePost and CreateComment

* Removed an unnecessary select query when saving a reaction

* Changed reactions route to be under /reactions

* Fixed copyright dates on newly added files

* Removed debug code that prevented all unit tests from being ran

* Cleaned up unnecessary code for reactions

* Renamed ReactionStore.List to ReactionStore.GetForPost

webapp/components/create_post.jsx

@@ -9,14 +9,16 @@ import FilePreview from './file_preview.jsx';
 import PostDeletedModal from './post_deleted_modal.jsx';
 import TutorialTip from './tutorial/tutorial_tip.jsx';
 
-import AppDispatcher from '../dispatcher/app_dispatcher.jsx';
+import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
 import * as GlobalActions from 'actions/global_actions.jsx';
 import Client from 'client/web_client.jsx';
 import * as Utils from 'utils/utils.jsx';
 import * as UserAgent from 'utils/user_agent.jsx';
 import * as ChannelActions from 'actions/channel_actions.jsx';
+import * as PostActions from 'actions/post_actions.jsx';
 
 import ChannelStore from 'stores/channel_store.jsx';
+import EmojiStore from 'stores/emoji_store.jsx';
 import PostStore from 'stores/post_store.jsx';
 import MessageHistoryStore from 'stores/message_history_store.jsx';
 import UserStore from 'stores/user_store.jsx';
@@ -34,6 +36,8 @@ const KeyCodes = Constants.KeyCodes;
 
 import React from 'react';
 
+export const REACTION_PATTERN = /^(\+|-):([^:\s]+):\s*$/;
+
 export default class CreatePost extends React.Component {
     constructor(props) {
         super(props);
@@ -101,6 +105,7 @@ export default class CreatePost extends React.Component {
 
         this.setState({submitting: true, serverError: null});
 
+        const isReaction = REACTION_PATTERN.exec(post.message);
         if (post.message.indexOf('/') === 0) {
             PostStore.storeDraft(this.state.channelId, null);
             this.setState({message: '', postError: null, fileInfos: []});
@@ -123,14 +128,18 @@ export default class CreatePost extends React.Component {
                         const state = {};
                         state.serverError = err.message;
                         state.submitting = false;
-                        this.setState(state);
+                        this.setState({state});
                     }
                 }
             );
+        } else if (isReaction && EmojiStore.has(isReaction[2])) {
+            this.sendReaction(isReaction);
         } else {
             this.sendMessage(post);
         }
 
+        this.setState({message: '', submitting: false, postError: null, fileInfos: [], serverError: null});
+
         const fasterThanHumanWillClick = 150;
         const forceFocus = (Date.now() - this.state.lastBlurAt < fasterThanHumanWillClick);
         this.focusTextbox(forceFocus);
@@ -148,7 +157,6 @@ export default class CreatePost extends React.Component {
         post.parent_id = this.state.parentId;
 
         GlobalActions.emitUserPostedEvent(post);
-        this.setState({message: '', submitting: false, postError: null, fileInfos: [], serverError: null});
 
         Client.createPost(post,
             (data) => {
@@ -177,6 +185,21 @@ export default class CreatePost extends React.Component {
         );
     }
 
+    sendReaction(isReaction) {
+        const action = isReaction[1];
+
+        const emojiName = isReaction[2];
+        const postId = PostStore.getLatestPost(this.state.channelId).id;
+
+        if (action === '+') {
+            PostActions.addReaction(this.state.channelId, postId, emojiName);
+        } else if (action === '-') {
+            PostActions.removeReaction(this.state.channelId, postId, emojiName);
+        }
+
+        PostStore.storeCurrentDraft(null);
+    }
+
     focusTextbox(keepFocus = false) {
         if (keepFocus || !Utils.isMobile()) {
             this.refs.textbox.focus();