diff --git a/app/assets/javascripts/discourse/components/d-editor.js.es6 b/app/assets/javascripts/discourse/components/d-editor.js.es6
index 83d9b5ce6..5ebd6ed92 100644
--- a/app/assets/javascripts/discourse/components/d-editor.js.es6
+++ b/app/assets/javascripts/discourse/components/d-editor.js.es6
@@ -3,7 +3,9 @@ import loadScript from 'discourse/lib/load-script';
 import { default as computed, on, observes } from 'ember-addons/ember-computed-decorators';
 import { showSelector } from "discourse/lib/emoji/emoji-toolbar";
 import Category from 'discourse/models/category';
-import { SEPARATOR as categoryHashtagSeparator } from 'discourse/lib/category-hashtags';
+import { SEPARATOR as categoryHashtagSeparator,
+         categoryHashtagTriggerRule
+       } from 'discourse/lib/category-hashtags';
 
 // Our head can be a static string or a function that returns a string
 // based on input (like for numbered lists).
@@ -262,25 +264,7 @@ export default Ember.Component.extend({
         return Category.search(term);
       },
       triggerRule(textarea, opts) {
-        const result = Discourse.Utilities.caretRowCol(textarea);
-        const row = result.rowNum;
-        var col = result.colNum;
-        var line = textarea.value.split("\n")[row - 1];
-
-        if (opts && opts.backSpace) {
-          col = col - 1;
-          line = line.slice(0, line.length - 1);
-
-          // Don't trigger autocomplete when backspacing into a `#category |` => `#category|`
-          if (/^#{1}\w+/.test(line)) return false;
-        }
-
-        if (col < 6) {
-          // Don't trigger autocomplete when ATX-style headers are used
-          return (line.slice(0, col) !== "#".repeat(col));
-        } else {
-          return true;
-        }
+        return categoryHashtagTriggerRule(textarea, opts);
       }
     });
   },
diff --git a/app/assets/javascripts/discourse/lib/category-hashtags.js.es6 b/app/assets/javascripts/discourse/lib/category-hashtags.js.es6
index da2be1209..7e0bed1ff 100644
--- a/app/assets/javascripts/discourse/lib/category-hashtags.js.es6
+++ b/app/assets/javascripts/discourse/lib/category-hashtags.js.es6
@@ -3,3 +3,25 @@ export const SEPARATOR = ":";
 export function replaceSpan($elem, categorySlug, categoryLink) {
   $elem.replaceWith(`<a href="${categoryLink}" class="hashtag">#<span>${categorySlug}</span></a>`);
 };
+
+export function categoryHashtagTriggerRule(textarea, opts) {
+  const result = Discourse.Utilities.caretRowCol(textarea);
+  const row = result.rowNum;
+  var col = result.colNum;
+  var line = textarea.value.split("\n")[row - 1];
+
+  if (opts && opts.backSpace) {
+    col = col - 1;
+    line = line.slice(0, line.length - 1);
+
+    // Don't trigger autocomplete when backspacing into a `#category |` => `#category|`
+    if (/^#{1}\w+/.test(line)) return false;
+  }
+
+  if (col < 6) {
+    // Don't trigger autocomplete when ATX-style headers are used
+    return (line.slice(0, col) !== "#".repeat(col));
+  } else {
+    return true;
+  }
+}