A. Costa wrote:
> Package: graphviz
> Version: 2.20.2-8+b1
> Severity: wishlist
>
>
> Oddly enough, 'dot' almost has this feature, but the helpful output
> itself is currently tricky to parse and list.
>
> Model example; 'mplayer':
>
> mplayer -vo help | tail
> mpegpes MPEG-PES to DVB card
> yuv4mpeg yuv4mpeg output for mjpegtools
> png PNG file
> jpeg JPEG file
> gif89a animated GIF output
> tga Targa output
> pnm PPM/PGM/PGMYUV file
> md5sum md5sum of each frame
>
> 112 audio & 235 video codecs
>
> 'man dot' asks users to guess & poll, or go online:
>
> % man dot | grep -A 17 "OUTPUT FORMATS"
> OUTPUT FORMATS
> Dot uses an extensible plugin mechanism for its output renderers,
> so to see what output formats your installation of dot supports you
> can use ``dot -Txxx'' (where xxx is an unlikely format) and check
> the warning message. Also, The plugin mechanism supports multiple
> implementations of the output formats. To see what variants are
> available, use, for example: ``dot -Tpng:'' and to force a particu-
> lar variant, use, for example: ``dot -Tpng:gd''
>
> Traditionally, dot supports the following: -Tps (PostScript), -Tsvg
> -Tsvgz (Structured Vector Graphics), -Tfig (XFIG graphics), -Tmif
> (FrameMaker graphics), -Thpgl (HP pen plotters), and -Tpcl (Laser-
> jet printers), -Tpng -Tgif (bitmap graphics), -Tdia (GTK+ based
> diagrams), -Timap (imagemap files for httpd servers for each node
> or edge that has a non(hynull "href" attribute.), -Tcmapx (client-
> side imagemap for use in html and xhtml). Additional less common
> or more special-purpose output formats can be found at
> http://www.graphviz.org/cvs/doc/info/output.html.)
>
>
> (Bonus: if an 'mplayer'-like '-T help' option were added, most of those
> two paragraphs won't be needed.)
>
> When testing what the 'man' says, the user is surprised to find that
> "the warning message" is close what a '-T help' option should be:
>
> # there's no 'help' graphics format, so try that...
> % dot -T help
> Format: "help" not recognized. Use one of: canon cmap cmapx
> cmapx_np dia dot eps fig gd gd2 gif hpgl imap imap_np ismap
> jpe jpeg jpg mif mp pcl pdf pic plain plain-ext png ps ps2
> svg svgz tk vml vmlz vrml vtx wbmp xdot xlib
>
> The above listing is incomplete; subtypes exist:
>
> # show help for 'png'
> dot -Tpng:
> Format: "png:" not recognized. Use one of: png:cairo:cairo
> png:cairo:gd png:gd:gd
>
> More than one format followed by only a colon (e.g. 'dia:') make 'dot'
> wait for input, (another bug?), so getting a complete list is a kludgy
> business. Until something better comes along, here's one way to do it:
>
> # parse '-T' error from stderr, mine that for suboptions,
> # ending needless processes as they occur.
> % for f in $(dot -T help 2>&1 | sed 's/.*://') ;
> do echo "Format: $f" ;
> dot -T$f: & n=$! ;
> sleep .1s ; kill -9 $n ;
> done 2>&1 | grep Format | sed 's/.*: //g;s/ /\n/g'
>
> On my system it shows 80 items. Anyway, the 'mplayer -vo help' style
> would be better.
>
> HTH...
>
Hi,
You might want to check out the -P option which outputs a graph of the
available plugins e.g.
dot -Tsvg -P -o dotformats.svg
Of course it's not quite the same as the simple list that your script
produces, but it does show the requisite information.
Cheers,
David.
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