Fix for meta keys in a weird iTerm state.

lib/tty_posix.js

@@ -93,7 +93,7 @@ ReadStream.prototype.isTTY = true;
 // Regexes used for ansi escape code splitting
 var metaKeyCodeRe = /^(?:\x1b)([a-zA-Z0-9])$/,
     functionKeyCodeRe =
-      /^(?:\x1b+)(O|N|\[|\[\[)(?:(\d+)(?:;(\d+))?([~^$])|(?:1;(\d+))?([a-zA-Z]))/;
+      /^(?:\x1b+)(O|N|\[|\[\[)(?:(\d+)(?:;(\d+))?([~^$])|(?:1;)?(\d+)?([a-zA-Z]))/;
 
 ReadStream.prototype._emitKey = function(s) {
   var char,
@@ -106,7 +106,12 @@ ReadStream.prototype._emitKey = function(s) {
       parts;
 
   if (Buffer.isBuffer(s)) {
-    s = s.toString(this.encoding || 'utf-8');
+    if (s[0] > 127 && s[1] === undefined) {
+      s[0] -= 128;
+      s = '\x1b'+s.toString(this.encoding || 'utf-8');
+    } else {
+      s = s.toString(this.encoding || 'utf-8');
+    }
   }
 
   if (s === '\r') {