Accept prompt in parser

lib/biju/parser.rb

@@ -12,7 +12,8 @@ module Biju
     rule(:prefix) { str('AT') | str('at') }
 
     # RESPONSE
-    rule(:response) { cr >> crlf >> (status | command) >> crlf }
+    rule(:response) { cr >> crlf >> (((status | command) >> crlf) | prompt)  }
+    rule(:prompt) { str('> ') }
     rule(:command) { mgl | pms | mgf | mserror }
 
     rule(:mserror) { str('+CMS ERROR').as(:cmd) >> str(': ') >> message }

spec/biju/parser_spec.rb

@@ -15,6 +15,13 @@ describe Biju::ATParser do
   end
 
   context "response" do
+    it "parses cmgs prompt" do
+      mgs = "AT+CMGS=18\r\r\n> "
+
+      expect { Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgs)) }.not_to raise_error
+    end
+
     it "parses messages list" do
       messages = "AT+CMGL=1\r\r\n" <<
                   "+CMGL: 0,1,,23\r\n" <<