Fixed issue where Tarmogoyf power and toughness would be incorrectly …

…formatted (#15)

lib/middleware/markdown-escape.js

@@ -0,0 +1,18 @@
+function escape(str) {
+  // Markdown on Slack can't always be escaped, the best solution is to use a
+  // vertical tab character which doesn't embolden text
+  // http://webapps.stackexchange.com/questions/86557/how-do-i-escape-formatting-characters-in-slack
+  return str.replace(new RegExp('\\*', 'g'), '\u000B\*');
+}
+
+
+module.exports = attachment => {
+  if (attachment.text) {
+    attachment.text = escape(attachment.text);
+    if (!('mrkdwn_in' in attachment)) {
+      attachment.mrkdwn_in = [];
+    }
+    attachment.mrkdwn_in.push('text');
+  }
+  return attachment;
+};

lib/response-types.js

@@ -5,6 +5,7 @@ const abilityWords = require('./middleware/ability-words');
 const footer = require('./middleware/footer');
 const manamoji = require('./middleware/manamoji');
 const reminderText = require('./middleware/reminder-text');
+const markdownEscape = require('./middleware/markdown-escape');
 
 const COLOR = '#431E3F';
 
@@ -68,7 +69,8 @@ TextResponse.prototype.middleware = [
   footer,
   manamoji,
   reminderText,
-  abilityWords
+  abilityWords,
+  markdownEscape
 ];
 TextResponse.prototype.url = 'https://api.scryfall.com/cards/named';