From 931e712af165a64e0ab4f9813cca8f6213b89d7c Mon Sep 17 00:00:00 2001
From: Harrison Healey <harrisonmhealey@gmail.com>
Date: Wed, 25 Jan 2017 21:16:18 -0500
Subject: Fixed ChannelMentionProvider matching completed mentions (#5188)

---
 .../suggestion/channel_mention_provider.jsx        | 122 +++++++++++----------
 webapp/components/suggestion/suggestion_box.jsx    |   6 +
 2 files changed, 72 insertions(+), 56 deletions(-)

diff --git a/webapp/components/suggestion/channel_mention_provider.jsx b/webapp/components/suggestion/channel_mention_provider.jsx
index 611f3de10..f1d6d9e76 100644
--- a/webapp/components/suggestion/channel_mention_provider.jsx
+++ b/webapp/components/suggestion/channel_mention_provider.jsx
@@ -51,73 +51,83 @@ class ChannelMentionSuggestion extends Suggestion {
 }
 
 export default class ChannelMentionProvider extends Provider {
+    constructor() {
+        super();
+
+        this.lastCompletedWord = '';
+    }
+
     handlePretextChanged(suggestionId, pretext) {
-        const captured = (/(^|\s)(~([^~]*))$/i).exec(pretext.toLowerCase());
-        if (captured) {
-            const prefix = captured[3];
+        const captured = (/(^|\s)(~([^~\r\n]*))$/i).exec(pretext.toLowerCase());
 
-            if ((/\s/).test(prefix)) {
-                // If there's a space, there's a chance that we've already completed this mention
-                const firstWordOfPrefix = prefix.split(' ')[0];
+        if (!captured) {
+            // Not a channel mention
+            return;
+        }
 
-                for (const channel of ChannelStore.getChannels()) {
-                    if (firstWordOfPrefix === channel.name) {
-                        // We've already mentioned this channel so there's nothing else to look for
-                        return;
-                    }
-                }
-            }
+        if (this.lastCompletedWord && captured[0].startsWith(this.lastCompletedWord)) {
+            // It appears we're still matching a channel handle that we already completed
+            return;
+        }
 
-            this.startNewRequest(prefix);
+        // Clear the last completed word since we've started to match new text
+        this.lastCompletedWord = '';
 
-            autocompleteChannels(
-                prefix,
-                (data) => {
-                    if (this.shouldCancelDispatch(prefix)) {
-                        return;
-                    }
+        const prefix = captured[3];
+
+        this.startNewRequest(prefix);
 
-                    const channels = data;
-
-                    // Wrap channels in an outer object to avoid overwriting the 'type' property.
-                    const wrappedChannels = [];
-                    const wrappedMoreChannels = [];
-                    const moreChannels = [];
-                    channels.forEach((item) => {
-                        if (ChannelStore.get(item.id)) {
-                            wrappedChannels.push({
-                                type: Constants.MENTION_CHANNELS,
-                                channel: item
-                            });
-                            return;
-                        }
-
-                        wrappedMoreChannels.push({
-                            type: Constants.MENTION_MORE_CHANNELS,
+        autocompleteChannels(
+            prefix,
+            (data) => {
+                if (this.shouldCancelDispatch(prefix)) {
+                    return;
+                }
+
+                const channels = data;
+
+                // Wrap channels in an outer object to avoid overwriting the 'type' property.
+                const wrappedChannels = [];
+                const wrappedMoreChannels = [];
+                const moreChannels = [];
+                channels.forEach((item) => {
+                    if (ChannelStore.get(item.id)) {
+                        wrappedChannels.push({
+                            type: Constants.MENTION_CHANNELS,
                             channel: item
                         });
+                        return;
+                    }
 
-                        moreChannels.push(item);
+                    wrappedMoreChannels.push({
+                        type: Constants.MENTION_MORE_CHANNELS,
+                        channel: item
                     });
 
-                    const wrapped = wrappedChannels.concat(wrappedMoreChannels);
-                    const mentions = wrapped.map((item) => '~' + item.channel.name);
-
-                    AppDispatcher.handleServerAction({
-                        type: ActionTypes.RECEIVED_MORE_CHANNELS,
-                        channels: moreChannels
-                    });
+                    moreChannels.push(item);
+                });
+
+                const wrapped = wrappedChannels.concat(wrappedMoreChannels);
+                const mentions = wrapped.map((item) => '~' + item.channel.name);
+
+                AppDispatcher.handleServerAction({
+                    type: ActionTypes.RECEIVED_MORE_CHANNELS,
+                    channels: moreChannels
+                });
+
+                AppDispatcher.handleServerAction({
+                    type: ActionTypes.SUGGESTION_RECEIVED_SUGGESTIONS,
+                    id: suggestionId,
+                    matchedPretext: captured[2],
+                    terms: mentions,
+                    items: wrapped,
+                    component: ChannelMentionSuggestion
+                });
+            }
+        );
+    }
 
-                    AppDispatcher.handleServerAction({
-                        type: ActionTypes.SUGGESTION_RECEIVED_SUGGESTIONS,
-                        id: suggestionId,
-                        matchedPretext: captured[2],
-                        terms: mentions,
-                        items: wrapped,
-                        component: ChannelMentionSuggestion
-                    });
-                }
-            );
-        }
+    handleCompleteWord(term) {
+        this.lastCompletedWord = term;
     }
 }
diff --git a/webapp/components/suggestion/suggestion_box.jsx b/webapp/components/suggestion/suggestion_box.jsx
index e9f7c3699..29b9b2d8b 100644
--- a/webapp/components/suggestion/suggestion_box.jsx
+++ b/webapp/components/suggestion/suggestion_box.jsx
@@ -153,6 +153,12 @@ export default class SuggestionBox extends React.Component {
         window.requestAnimationFrame(() => {
             Utils.setCaretPosition(textbox, prefix.length + term.length + 1);
         });
+
+        for (const provider of this.props.providers) {
+            if (provider.handleCompleteWord) {
+                provider.handleCompleteWord(term, matchedPretext);
+            }
+        }
     }
 
     handleKeyDown(e) {
-- 
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