Add an Emoji Typeahead

Summary:
This adds a more complete emoji datasource, with a typeahead and autocomplete. It works by pulling in a raw datasource from EmojiOne (I chose Unicode 8, but they have a Unicode 9 datasource as well) and transforming it for speed/need. If we build more robustness or an actual picker into the Remarkup bar, having the additional keywords, etc, might be important. When Unicode 9 support is more prevalent, we should only need to update the single file.

 Tossing up as a proof of concept on engineering direction. Also I can't quite get the autocomplete to complete.

Test Plan: Test UIExamples, Autocomplete, and TypeaheadSource

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12139

Differential Revision: https://secure.phabricator.com/D17244

scripts/celerity/generate_emoji.php

@@ -0,0 +1,48 @@
+#!/usr/bin/env php
+<?php
+
+require_once dirname(dirname(__FILE__)).'/__init_script__.php';
+
+$args = new PhutilArgumentParser($argv);
+$args->setTagline(pht('regenerate Emoji data sheets'));
+$args->setSynopsis(<<<EOHELP
+**emoji**
+    Rebuild Emoji data sheets.
+
+EOHELP
+);
+$args->parseStandardArguments();
+$args->parse(
+  array(
+    array(
+      'name'  => 'force',
+      'help'  => pht('Force regeneration even if sources have not changed.'),
+    ),
+  ));
+
+$root = dirname(phutil_get_library_root('phabricator'));
+$path = $root.'/webroot/rsrc/externals/emojione/emoji_strategy.json';
+$export_path = $root.'/webroot/rsrc/emoji/manifest.json';
+
+if (Filesystem::pathExists($path)) {
+  $json = Filesystem::readFile($path);
+
+  $emojis = phutil_json_decode($json);
+  $data = array();
+  foreach ($emojis as $shortname => $emoji) {
+    $unicode = $emoji['unicode'];
+    $codes = explode('-', $unicode);
+    $hex = '';
+    foreach ($codes as $code) {
+      $hex .= phutil_utf8_encode_codepoint(hexdec($code));
+    }
+    $data[$shortname] = $hex;
+  }
+
+  $json = new PhutilJSON();
+  $data = $json->encodeFormatted($data);
+  Filesystem::writeFile($export_path, $data);
+  echo pht('Done.')."\n";
+} else {
+  echo pht('Path %s not exist.', $path)."\n";
+}