Add documentation about supported sites (Fixes #4503)

devscripts/make_supportedsites.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+from __future__ import unicode_literals
+
+import io
+import optparse
+import os
+import sys
+
+
+# Import youtube_dl
+ROOT_DIR = os.path.join(os.path.dirname(__file__), '..')
+sys.path.append(ROOT_DIR)
+import youtube_dl
+
+
+def main():
+    parser = optparse.OptionParser(usage='%prog OUTFILE.md')
+    options, args = parser.parse_args()
+    if len(args) != 1:
+        parser.error('Expected an output filename')
+
+    outfile, = args
+
+    def gen_ies_md(ies):
+        for ie in ies:
+            ie_md = '**{}**'.format(ie.IE_NAME)
+            ie_desc = getattr(ie, 'IE_DESC', None)
+            if ie_desc is False:
+                continue
+            if ie_desc is not None:
+                ie_md += ': {}'.format(ie.IE_DESC)
+            if not ie.working():
+                ie_md += ' (Currently broken)'
+            yield ie_md
+
+    ies = sorted(youtube_dl.gen_extractors(), key=lambda i: i.IE_NAME.lower())
+    out = '# Supported sites\n' + ''.join(
+        ' - ' + md + '\n'
+        for md in gen_ies_md(ies))
+
+    with io.open(outfile, 'w', encoding='utf-8') as outf:
+        outf.write(out)
+
+if __name__ == '__main__':
+    main()