Refactor subtitle options from srt to the more generic 'sub'.

In order to be more consistent with different subtitle formats.
From:
* --write-srt to --write-sub
* --only-srt to --only-sub
* --all-srt to --all-subs
* --srt-lang to --sub-lang'

Refactored also all the mentions of srt for sub in all the source code.

3 files changed, 54 insertions, 54 deletions

diff --git a/youtube_dl/FileDownloader.py b/youtube_dl/FileDownloader.py
index e496b8a8d..4549dd464 100644
--- a/youtube_dl/FileDownloader.py
+++ b/youtube_dl/FileDownloader.py
@@ -78,7 +78,7 @@ class FileDownloader(object):
     updatetime:        Use the Last-modified header to set output file timestamps.
     writedescription:  Write the video description to a .description file
     writeinfojson:     Write the video description to a .info.json file
-    writesubtitles:    Write the video subtitles to a .srt file
+    writesubtitles:    Write the video subtitles to a file (default=srt)
     onlysubtitles:     Downloads only the subtitles of the video
     allsubtitles:      Downloads all the subtitles of the video
     subtitleslang:     Language of the subtitles to download
@@ -291,9 +291,9 @@ class FileDownloader(object):
         """ Report that the description file is being written """
         self.to_screen(u'[info] Writing video description to: ' + descfn)
 
-    def report_writesubtitles(self, srtfn):
+    def report_writesubtitles(self, sub_filename):
         """ Report that the subtitles file is being written """
-        self.to_screen(u'[info] Writing video subtitles to: ' + srtfn)
+        self.to_screen(u'[info] Writing video subtitles to: ' + sub_filename)
 
     def report_writeinfojson(self, infofn):
         """ Report that the metadata file has been written """
@@ -444,12 +444,12 @@ class FileDownloader(object):
             # subtitles download errors are already managed as troubles in relevant IE
             # that way it will silently go on when used with unsupporting IE
             subtitle = info_dict['subtitles'][0]
-            (srt_error, srt_lang, srt) = subtitle
+            (sub_error, sub_lang, sub) = subtitle
             try:
-                srtfn = filename.rsplit('.', 1)[0] + u'.' + srt_lang + u'.srt'
-                self.report_writesubtitles(srtfn)
-                with io.open(encodeFilename(srtfn), 'w', encoding='utf-8') as srtfile:
-                    srtfile.write(srt)
+                sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.srt'
+                self.report_writesubtitles(sub_filename)
+                with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
+                    subfile.write(sub)
             except (OSError, IOError):
                 self.trouble(u'ERROR: Cannot write subtitles file ' + descfn)
                 return
@@ -459,12 +459,12 @@ class FileDownloader(object):
         if self.params.get('allsubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
             subtitles = info_dict['subtitles']
             for subtitle in subtitles:
-                (srt_error, srt_lang, srt) = subtitle
+                (sub_error, sub_lang, sub) = subtitle
                 try:
-                    srtfn = filename.rsplit('.', 1)[0] + u'.' + srt_lang + u'.srt'
-                    self.report_writesubtitles(srtfn)
-                    with io.open(encodeFilename(srtfn), 'w', encoding='utf-8') as srtfile:
-                            srtfile.write(srt)
+                    sub_filename = filename.rsplit('.', 1)[0] + u'.' + sub_lang + u'.srt'
+                    self.report_writesubtitles(sub_filename)
+                    with io.open(encodeFilename(sub_filename), 'w', encoding='utf-8') as subfile:
+                            subfile.write(sub)
                 except (OSError, IOError):
                     self.trouble(u'ERROR: Cannot write subtitles file ' + descfn)
                     return
diff --git a/youtube_dl/InfoExtractors.py b/youtube_dl/InfoExtractors.py
index a220de80a..e078bb083 100755
--- a/youtube_dl/InfoExtractors.py
+++ b/youtube_dl/InfoExtractors.py
@@ -47,7 +47,7 @@ class InfoExtractor(object):
     uploader_id:    Nickname or id of the video uploader.
     location:       Physical location of the video.
     player_url:     SWF Player URL (used for rtmpdump).
-    subtitles:      The .srt file contents.
+    subtitles:      The subtitle file contents.
     urlhandle:      [internal] The urlHandle to be used to download the file,
                     like returned by urllib.request.urlopen
 
@@ -235,56 +235,56 @@ class YoutubeIE(InfoExtractor):
     def _get_available_subtitles(self, video_id):
         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
         try:
-            srt_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
+            sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
             return (u'WARNING: unable to download video subtitles: %s' % compat_str(err), None)
-        srt_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', srt_list)
-        srt_lang_list = dict((l[1], l[0]) for l in srt_lang_list)
-        if not srt_lang_list:
+        sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
+        sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
+        if not sub_lang_list:
             return (u'WARNING: video has no closed captions', None)
-        return srt_lang_list
+        return sub_lang_list
 
-    def _request_subtitle(self, str_lang, str_name, video_id, format = 'srt'):
-        self.report_video_subtitles_request(video_id, str_lang)
+    def _request_subtitle(self, sub_lang, sub_name, video_id, format = 'srt'):
+        self.report_video_subtitles_request(video_id, sub_lang)
         params = compat_urllib_parse.urlencode({
-            'lang': str_lang,
-            'name': str_name,
+            'lang': sub_lang,
+            'name': sub_name,
             'v': video_id,
             'fmt': format,
         })
         url = 'http://www.youtube.com/api/timedtext?' + params
         try:
-            srt = compat_urllib_request.urlopen(url).read().decode('utf-8')
+            sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
             return (u'WARNING: unable to download video subtitles: %s' % compat_str(err), None)
-        if not srt:
+        if not sub:
             return (u'WARNING: Did not fetch video subtitles', None)
-        return (None, str_lang, srt)
+        return (None, sub_lang, sub)
 
     def _extract_subtitle(self, video_id):
         self.report_video_subtitles_download(video_id)
-        srt_lang_list = self._get_available_subtitles(video_id)
+        sub_lang_list = self._get_available_subtitles(video_id)
 
         if self._downloader.params.get('subtitleslang', False):
-            srt_lang = self._downloader.params.get('subtitleslang')
-        elif 'en' in srt_lang_list:
-            srt_lang = 'en'
+            sub_lang = self._downloader.params.get('subtitleslang')
+        elif 'en' in sub_lang_list:
+            sub_lang = 'en'
         else:
-            srt_lang = list(srt_lang_list.keys())[0]
-        if not srt_lang in srt_lang_list:
-            return (u'WARNING: no closed captions found in the specified language "%s"' % srt_lang, None)
+            sub_lang = list(sub_lang_list.keys())[0]
+        if not sub_lang in sub_lang_list:
+            return (u'WARNING: no closed captions found in the specified language "%s"' % sub_lang, None)
 
-        sub = self._request_subtitle(srt_lang, srt_lang_list[srt_lang].encode('utf-8'), video_id)
-        return [sub]
+        subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id)
+        return [subtitle]
 
     def _extract_all_subtitles(self, video_id):
         self.report_video_subtitles_download(video_id)
-        srt_lang_list = self._get_available_subtitles(video_id)
-        subs = []
-        for srt_lang in srt_lang_list:
-            sub = self._request_subtitle(srt_lang, srt_lang_list[srt_lang].encode('utf-8'), video_id)
-            subs.append(sub)
-        return subs
+        sub_lang_list = self._get_available_subtitles(video_id)
+        subtitles = []
+        for sub_lang in sub_lang_list:
+            subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id)
+            subtitles.append(subtitle)
+        return subtitles
 
     def _print_formats(self, formats):
         print('Available formats:')
@@ -511,16 +511,16 @@ class YoutubeIE(InfoExtractor):
         if self._downloader.params.get('writesubtitles', False):
             video_subtitles = self._extract_subtitle(video_id)
             if video_subtitles:
-                (srt_error, srt_lang, srt) = video_subtitles[0]
-                if srt_error:
-                    self._downloader.trouble(srt_error)
+                (sub_error, sub_lang, sub) = video_subtitles[0]
+                if sub_error:
+                    self._downloader.trouble(sub_error)
 
         if self._downloader.params.get('allsubtitles', False):
             video_subtitles = self._extract_all_subtitles(video_id)
             for video_subtitle in video_subtitles:
-                (srt_error, srt_lang, srt) = video_subtitle
-                if srt_error:
-                    self._downloader.trouble(srt_error)
+                (sub_error, sub_lang, sub) = video_subtitle
+                if sub_error:
+                    self._downloader.trouble(sub_error)
 
         if 'length_seconds' not in video_info:
             self._downloader.trouble(u'WARNING: unable to extract video duration')
diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 20a22a4d1..495b5ac41 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -173,18 +173,18 @@ def parseOpts():
             action='store', dest='format_limit', metavar='FORMAT', help='highest quality format to download')
     video_format.add_option('-F', '--list-formats',
             action='store_true', dest='listformats', help='list all available formats (currently youtube only)')
-    video_format.add_option('--write-srt',
+    video_format.add_option('--write-sub',
             action='store_true', dest='writesubtitles',
-            help='write video closed captions to a .srt file (currently youtube only)', default=False)
-    video_format.add_option('--only-srt',
+            help='write subtitle file (currently youtube only)', default=False)
+    video_format.add_option('--only-sub',
             action='store_true', dest='onlysubtitles',
-            help='downloads only the subtitles of the video (currently youtube only)', default=False)
-    video_format.add_option('--all-srt',
+            help='downloads only the subtitles (no video)', default=False)
+    video_format.add_option('--all-subs',
             action='store_true', dest='allsubtitles',
             help='downloads all the available subtitles of the video (currently youtube only)', default=False)
-    video_format.add_option('--srt-lang',
+    video_format.add_option('--sub-lang',
             action='store', dest='subtitleslang', metavar='LANG',
-            help='language of the closed captions to download (optional) use IETF language tags like \'en\'')
+            help='language of the subtitles to download (optional) use IETF language tags like \'en\'')
 
     verbosity.add_option('-q', '--quiet',
             action='store_true', dest='quiet', help='activates quiet mode', default=False)