Move the downloader return code to a class member

This makes it possible to initialize it with value zero and later let the
trouble() overwrite the value. It simplifies error treatment and paves the way
for the InfoExtracto objects to call process_info() themselves, which should
solve the issues with tor and some other problems.

youtube-dl

@@ -95,11 +95,13 @@ class FileDownloader(object):
 	params = None
 	_ies = []
 	_pps = []
+	_download_retcode = None
 
 	def __init__(self, params):
 		"""Create a FileDownloader object with the given options."""
 		self._ies = []
 		self._pps = []
+		self._download_retcode = 0
 		self.params = params
 	
 	@staticmethod
@@ -203,15 +205,13 @@ class FileDownloader(object):
 
 		Depending on if the downloader has been configured to ignore
 		download errors or not, this method may throw an exception or
-		not when errors are found, after printing the message. If it
+		not when errors are found, after printing the message.
-		doesn't raise, it returns an error code suitable to be returned
-		later as a program exit code to indicate error.
 		"""
 		if message is not None:
 			self.to_stderr(message)
 		if not self.params.get('ignoreerrors', False):
 			raise DownloadError(message)
-		return 1
+		self._download_retcode = 1
 
 	def slow_down(self, start_time, byte_counter):
 		"""Sleep if the download speed is over the rate limit."""
@@ -249,41 +249,45 @@ class FileDownloader(object):
 			
 		# Do nothing else if in simulate mode
 		if self.params.get('simulate', False):
-			return 0
+			return
 
 		try:
 			filename = self.params['outtmpl'] % info_dict
 			self.report_destination(filename)
 		except (ValueError, KeyError), err:
-			return self.trouble('ERROR: invalid output template or system charset: %s' % str(err))
+			self.trouble('ERROR: invalid output template or system charset: %s' % str(err))
 		if self.params['nooverwrites'] and os.path.exists(filename):
 			self.to_stderr('WARNING: file exists: %s; skipping' % filename)
-			return 0
+			return
 		try:
 			self.pmkdir(filename)
 		except (OSError, IOError), err:
-			return self.trouble('ERROR: unable to create directories: %s' % str(err))
+			self.trouble('ERROR: unable to create directories: %s' % str(err))
+			return
 		try:
 			outstream = open(filename, 'wb')
 		except (OSError, IOError), err:
-			return self.trouble('ERROR: unable to open for writing: %s' % str(err))
+			self.trouble('ERROR: unable to open for writing: %s' % str(err))
+			return
 		try:
 			self._do_download(outstream, info_dict['url'])
 			outstream.close()
 		except (OSError, IOError), err:
-			return self.trouble('ERROR: unable to write video data: %s' % str(err))
+			self.trouble('ERROR: unable to write video data: %s' % str(err))
+			return
 		except (urllib2.URLError, httplib.HTTPException, socket.error), err:
-			return self.trouble('ERROR: unable to download video data: %s' % str(err))
+			self.trouble('ERROR: unable to download video data: %s' % str(err))
+			return
 		try:
 			self.post_process(filename, info_dict)
 		except (PostProcessingError), err:
-			return self.trouble('ERROR: postprocessing: %s' % str(err))
+			self.trouble('ERROR: postprocessing: %s' % str(err))
+			return
 
-		return 0
+		return
 
 	def download(self, url_list):
 		"""Download a given list of URLs."""
-		retcode = 0
 		if len(url_list) > 1 and self.fixed_template():
 			raise SameFileError(self.params['outtmpl'])
 
@@ -303,7 +307,7 @@ class FileDownloader(object):
 
 				# See if there were problems extracting any information
 				if len(results) != len(all_results):
-					retcode = self.trouble()
+					self.trouble()
 
 				# Two results could go to the same file
 				if len(results) > 1 and self.fixed_template():
@@ -311,19 +315,15 @@ class FileDownloader(object):
 
 				# Process each result
 				for result in results:
-					result = self.process_info(result)
+					self.process_info(result)
-
-					# Do not overwrite an error code with a success code
-					if result != 0:
-						retcode = result
 
 				# Suitable InfoExtractor had been found; go to next URL
 				break
 
 			if not suitable_found:
-				retcode = self.trouble('ERROR: no suitable InfoExtractor: %s' % url)
+				self.trouble('ERROR: no suitable InfoExtractor: %s' % url)
 
-		return retcode
+		return self._download_retcode
 
 	def post_process(self, filename, ie_info):
 		"""Run the postprocessing chain on the given file."""