[youtube] Added argument --write-tags, that ads the list of tags to the end of the description file. Implies --write-description.

youtube_dl/YoutubeDL.py

@@ -150,6 +150,7 @@ class YoutubeDL(object):
     logger:            Log messages to a logging.Logger instance.
     logtostderr:       Log messages to stderr instead of stdout.
     writedescription:  Write the video description to a .description file
+    writetags:         Write out the tags of the video to the bottom of the .description file.
     writeinfojson:     Write the video description to a .info.json file
     writeannotations:  Write the video annotations to a .annotations.xml file
     writethumbnail:    Write the thumbnail image to a file
@@ -1291,7 +1292,7 @@ class YoutubeDL(object):
             self.report_error('unable to create directory ' + compat_str(err))
             return
 
-        if self.params.get('writedescription', False):
+        if self.params.get('writedescription', False) or (self.params.get('writetags', False) and 'tags' in info_dict):
             descfn = replace_extension(filename, 'description', info_dict.get('ext'))
             if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(descfn)):
                 self.to_screen('[info] Video description is already present')
@@ -1302,6 +1303,8 @@ class YoutubeDL(object):
                     self.to_screen('[info] Writing video description to: ' + descfn)
                     with io.open(encodeFilename(descfn), 'w', encoding='utf-8') as descfile:
                         descfile.write(info_dict['description'])
+                        if self.params.get('writetags', False):
+                            descfile.write("\nKeywords: %s\n" % (info_dict['tags'],))
                 except (OSError, IOError):
                     self.report_error('Cannot write description file ' + descfn)
                     return

youtube_dl/__init__.py

@@ -314,6 +314,7 @@ def _real_main(argv=None):
         'nopart': opts.nopart,
         'updatetime': opts.updatetime,
         'writedescription': opts.writedescription,
+        'writetags': opts.writetags,
         'writeannotations': opts.writeannotations,
         'writeinfojson': opts.writeinfojson,
         'writethumbnail': opts.writethumbnail,

youtube_dl/extractor/youtube.py

@@ -1072,6 +1072,9 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         else:
             video_categories = None
 
+        m = re.findall(r'''<meta(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]+|="[^"]+"|='[^']+'))*?\s+property=['"]?og:video:tag['"]?(?:\s+[a-zA-Z0-9:._-]+(?:=[a-zA-Z0-9:._-]+|="[^"]+"|='[^']+'))*?\s+content=['"]?([^>'"]+?)['"]?\s*>'''
+        , video_webpage, re.DOTALL | re.IGNORECASE);
+        video_tags = u", ".join(m)
         # description
         video_description = get_element_by_id("eow-description", video_webpage)
         if video_description:
@@ -1259,6 +1262,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
             'title': video_title,
             'thumbnail': video_thumbnail,
             'description': video_description,
+            'tags' : video_tags,
             'categories': video_categories,
             'subtitles': video_subtitles,
             'automatic_captions': automatic_captions,

youtube_dl/options.py

@@ -635,6 +635,10 @@ def parseOpts(overrideArguments=None):
         '--write-description',
         action='store_true', dest='writedescription', default=False,
         help='Write video description to a .description file')
+    filesystem.add_option(
+        '--write-tags',
+        action='store_true', dest='writetags', default=False,
+        help='Write out the tags of the video to the bottom of the .description file. Implies --write-description.')
     filesystem.add_option(
         '--write-info-json',
         action='store_true', dest='writeinfojson', default=False,