Fix not rendered autocomplete emojis

Currently we have some emojis that are autocompleted but won't show up
in the resulting document.

This patch adds all emojis that are pushed to Codemirror and applies
them to the markdown rendering process, so they become usable.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

public/js/extra.js

@@ -1145,6 +1145,20 @@ const pdfPlugin = new Plugin(
     }
 )
 
+const emojijsPlugin = new Plugin(
+    // regexp to match emoji shortcodes :something:
+    /:([\d\D]*):/,
+
+    (match, utils) => {
+      const emoji = match[1] ? match[1].toLowerCase() : undefined
+      if (window.emojify.emojiNames.includes(emoji)) {
+        const div = $(`<img class="emoji" src="${serverurl}/build/emojify.js/dist/images/basic/${emoji}.png"></img>`)
+        return div[0].outerHTML
+      }
+      return match[0]
+    }
+)
+
 // yaml meta, from https://github.com/eugeneware/remarkable-meta
 function get (state, line) {
   const pos = state.bMarks[line]
@@ -1189,6 +1203,7 @@ function metaPlugin (md) {
 }
 
 md.use(metaPlugin)
+md.use(emojijsPlugin)
 md.use(youtubePlugin)
 md.use(vimeoPlugin)
 md.use(gistPlugin)