Switch from restler to unirest

restler is buggy and doesn't support utf8 multipart requests

lib/functions/argument-parser.js

@@ -33,8 +33,13 @@ const ESCAPABLE = '.^$*+?()[{\\|}]'.split('');
  * @return {object} Parsed arguments
  */
 export default function argumentParser(format, string) {
-  string = string.replace(/[^\s]+/, '');
-  format = format.replace(/[^\s]+/, '');
+  string = string.replace(/[^\s]+/, '').trim();
+  format = format.replace(/[^\s]+/, '').trim();
+
+  if (!string || !format) {
+    return {};
+  }
+
   let indexes = [];
 
   format = format.replace(/\s/g, '\\s*');

lib/functions/fetch.js

@@ -1,18 +1,24 @@
-import restler from 'restler';
+import unirest from 'unirest';
 
 export default function fetch(path, data = {}) {
   return new Promise((resolve, reject) => {
-    const method = Object.keys(data).length ? 'POST' : 'GET';
-    const multipart = method === 'POST' ? true : false;
+    const files = {};
 
-    restler.request('https://api.telegram.org/bot' + path, {
-      data, method, multipart
-    }).on('complete', response => {
-      try {
-        let json = JSON.parse(response);
-        resolve(json);
-      } catch(e) {
-        reject(e);
+    for (let key of Object.keys(data)) {
+      if (data[key].file) {
+        files[key] = data[key].file;
+        delete data[key];
+      }
+    }
+
+    unirest.post('https://api.telegram.org/bot' + path)
+    .field(data)
+    .attach(files)
+    .end(response => {
+      if (response.statusType === 4 || response.statusType === 5) {
+        reject(response);
+      } else {
+        resolve(response.body);
       }
     });
   });