New --id option for the old default filename pattern

README.md

@@ -36,6 +36,7 @@ which means you can modify it, redistribute it or use it however you like.
 
 ## Filesystem Options:
     -t, --title              use title in file name
+    --id                     use video ID in file name
     -l, --literal            use literal title in file name
     -A, --auto-number        number downloaded files starting from 00000
     -o, --output TEMPLATE    output filename template. Use %(stitle)s to get the

youtube-dl.1

@@ -48,6 +48,7 @@ redistribute it or use it however you like.
 .nf
 \f[C]
 -t,\ --title\ \ \ \ \ \ \ \ \ \ \ \ \ \ use\ title\ in\ file\ name
+--id\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ use\ video\ ID\ in\ file\ name
 -l,\ --literal\ \ \ \ \ \ \ \ \ \ \ \ use\ literal\ title\ in\ file\ name
 -A,\ --auto-number\ \ \ \ \ \ \ \ number\ downloaded\ files\ starting\ from\ 00000
 -o,\ --output\ TEMPLATE\ \ \ \ output\ filename\ template.\ Use\ %(stitle)s\ to\ get\ the

youtube-dl.bash-completion

@@ -3,7 +3,7 @@ __youtube-dl()
     local cur prev opts
     COMPREPLY=()
     cur="${COMP_WORDS[COMP_CWORD]}"
-    opts="--all-formats --audio-format --audio-quality --auto-number --batch-file --console-title --continue --cookies --dump-user-agent --extract-audio --format --get-description --get-filename --get-format --get-thumbnail --get-title --get-url --help --ignore-errors --keep-video --list-extractors --list-formats --literal --match-title --max-downloads --max-quality --netrc --no-continue --no-mtime --no-overwrites --no-part --no-progress --output --password --playlist-end --playlist-start --prefer-free-formats --quiet --rate-limit --reject-title --retries --simulate --skip-download --srt-lang --title --update --user-agent --username --verbose --version --write-description --write-info-json --write-srt"
+    opts="--all-formats --audio-format --audio-quality --auto-number --batch-file --console-title --continue --cookies --dump-user-agent --extract-audio --format --get-description --get-filename --get-format --get-thumbnail --get-title --get-url --help --id --ignore-errors --keep-video --list-extractors --list-formats --literal --match-title --max-downloads --max-quality --netrc --no-continue --no-mtime --no-overwrites --no-part --no-progress --output --password --playlist-end --playlist-start --prefer-free-formats --quiet --rate-limit --reject-title --retries --simulate --skip-download --srt-lang --title --update --user-agent --username --verbose --version --write-description --write-info-json --write-srt"
 
     if [[ ${cur} == * ]] ; then
         COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )

youtube_dl/__init__.py

@@ -265,6 +265,8 @@ def parseOpts():
 
 	filesystem.add_option('-t', '--title',
 			action='store_true', dest='usetitle', help='use title in file name', default=False)
+	filesystem.add_option('--id',
+			action='store_true', dest='useid', help='use video ID in file name', default=False)
 	filesystem.add_option('-l', '--literal',
 			action='store_true', dest='useliteral', help='use literal title in file name', default=False)
 	filesystem.add_option('-A', '--auto-number',
@@ -424,10 +426,14 @@ def _real_main():
 		parser.error(u'using .netrc conflicts with giving username/password')
 	if opts.password is not None and opts.username is None:
 		parser.error(u'account username missing')
-	if opts.outtmpl is not None and (opts.useliteral or opts.usetitle or opts.autonumber):
+	if opts.outtmpl is not None and (opts.useliteral or opts.usetitle or opts.autonumber or opts.useid):
-		parser.error(u'using output template conflicts with using title, literal title or auto number')
+		parser.error(u'using output template conflicts with using title, literal title, video ID or auto number')
 	if opts.usetitle and opts.useliteral:
 		parser.error(u'using title conflicts with using literal title')
+	if opts.usetitle and opts.useid:
+		parser.error(u'using title conflicts with using video ID')
+	if opts.useliteral and opts.useid:
+		parser.error(u'using literal title conflicts with using video ID')
 	if opts.username is not None and opts.password is None:
 		opts.password = getpass.getpass(u'Type account password and press return:')
 	if opts.ratelimit is not None:
@@ -485,6 +491,7 @@ def _real_main():
 			or (opts.useliteral and opts.autonumber and u'%(autonumber)s-%(title)s-%(id)s.%(ext)s')
 			or (opts.usetitle and u'%(stitle)s-%(id)s.%(ext)s')
 			or (opts.useliteral and u'%(title)s-%(id)s.%(ext)s')
+			or (opts.useid and u'%(id)s.%(ext)s')
 			or (opts.autonumber and u'%(autonumber)s-%(id)s.%(ext)s')
 			or u'%(id)s.%(ext)s'),
 		'ignoreerrors': opts.ignoreerrors,