update emoji.json, add script that merges new emoji from another source

tools/emoji_merger.js

@@ -0,0 +1,67 @@
+/*
+  Emoji merger script, quick hack of a tool to:
+  - update some missing emoji from an external source
+  - sort the emoji
+  - remove all multipart emoji (reactions don't allow them)
+
+  Merges emoji from here: https://gist.github.com/oliveratgithub/0bf11a9aff0d6da7b46f1490f86a71eb
+  to the simpler format we're using.
+*/
+
+// Existing emojis we have
+const oldEmojiFilename = '../static/emoji.json'
+
+// The file downloaded from https://gist.github.com/oliveratgithub/0bf11a9aff0d6da7b46f1490f86a71eb
+const newEmojiFilename = 'emojis.json'
+
+// Output, replace the static/emoji.json with this file if it looks correct
+const outputFilename = 'output.json'
+
+const run = () => {
+  const fs = require('fs')
+
+  let newEmojisObject = {}
+  let emojisObject = {}
+
+  let data = fs.readFileSync(newEmojiFilename, 'utf8')
+
+  // First filter out anything that's more than one codepoint
+  const newEmojis = JSON.parse(data).emojis.filter(e => e.emoji.length <= 2)
+
+  // Create a table with format { shortname: emoji }, remove the :
+  newEmojis.forEach(e => {
+    const name = e.shortname.slice(1, e.shortname.length - 1).toLowerCase()
+    if (name.length > 0) {
+      newEmojisObject[name] = e.emoji
+    }
+  })
+
+  data = fs.readFileSync(oldEmojiFilename, 'utf8')
+
+  emojisObject = JSON.parse(data)
+
+  // Get rid of longer emojis that don't play nice with reactions
+  Object.keys(emojisObject).forEach(e => {
+    if (emojisObject[e].length > 2) emojisObject[e] = undefined
+  })
+
+  // Add new emojis from the new tables to the old table
+  Object.keys(newEmojisObject).forEach(e => {
+    if (!emojisObject[e] && newEmojisObject[e].length <= 2) {
+      emojisObject[e] = newEmojisObject[e]
+    }
+  })
+
+  // Sort by key
+  const sorted = Object.keys(emojisObject).sort().reduce((acc, key) => {
+    if (key.length === 0) return acc
+    acc[key] = emojisObject[key]
+    return acc
+  }, {})
+
+  fs.writeFile(outputFilename, JSON.stringify(sorted, null, 2), 'utf8', (err) => {
+    if (err) console.log('Error writing file', err)
+  })
+}
+
+run()