Add option to write all REPL prints to a logfile (#100)

src/frida/application.py

@@ -73,6 +73,7 @@ class ConsoleApplication(object):
                 action='store_const', const='remote', dest="device_type", default=None)
         parser.add_option("-H", "--host", help="connect to remote frida-server on HOST",
                 metavar="HOST", type='string', action='store', dest="host", default=None)
+        parser.add_option("-o", "--output", help="output to log file", dest="logfile", default=None)
         if self._needs_target():
             def store_target(option, opt_str, target_value, parser, target_type, *args, **kwargs):
                 if target_type == 'file':
@@ -119,7 +120,13 @@ class ConsoleApplication(object):
         self._exit_status = None
         self._console_state = ConsoleState.EMPTY
         self._quiet = False
-
+        self._logfile = None;
+        if options.logfile is not None:
+            try:
+                self._logfile = open(options.logfile, 'w')
+            except Exception as e:
+                self._update_status('Failed to open logfile "%s"' % options.logfile)
+                sys.exit(1)
         if sum(map(lambda v: int(v is not None), (self._device_id, self._device_type, self._host))) > 1:
             parser.error("Only one of -D, -U, -R, and -H may be specified")
 
@@ -310,6 +317,8 @@ class ConsoleApplication(object):
         else:
             color = Fore.RED if level == 'error' else Fore.YELLOW
             self._print(color + Style.BRIGHT + text + Style.RESET_ALL)
+        if self._logfile is not None:
+            self._logfile.write(text + "\n");
 
 def find_device(type):
     for device in frida.enumerate_devices():