Re: passing options to subfilters?

[Michal Szymanski <msz@xxxxxxxxxxxxxx>]

On Tue, Apr 09, 2002 at 11:05:22AM +0200, Michael Loßin wrote:
> Michal Szymanski wrote:
> > Would be nice. The topic I am thinking about, is "pretty printing". With
> > the default setup (of apsfilter and probably also of a2ps) I get some
> > files (e.g. C programs starting with #include) printed
> > syntax-highlighted, in color on a deskjet printer. This is not always
> > desirable. It would be nice to have an option to control pretty
> > printing: nopp, pp, color-pp. 
> 
> This should be possible, provided that those text-to-PS
> filters have options to explicitly switch on/off
> pretty-printing (to allow overriding any option already
> included in A2PS_BASIC etc.).

At least for a2ps, giving "--highlight-level=none" option *after* the
default "-g" (which stands for --highlight-level=heavy), switches
the pretty printing off.

I've also checked the A2PS part of apsfilter to find that passing
"mono" option to apsfilter, changes also the highlighting mode of a2ps
(--prologue=bw), so we'd need only a boolean flag: pp/nopp

> > > A2PS_OPTS does actually overwrite the complete command line
> > > and will be used if it is set (with only "-q -o -" added,
> > > so the output will be properly sent to stdout).
> > >
> > > A2PS_BASIC is used to supply a basic set of options that are
> > > extended with (the file specific set of) paper size, color,
> > > file type, ... parameters.
> > 
> > Thanks for explanation. One more question: what are the default options
> > passed? At first, I thought that the commented options give defaults but
> > surely they do not (e.g. text is printed w/o borders!)
> 
> Hm?!
> 
> (from template apsfilterrc:)
> 
> # override a2ps default options
> # defaults:
>   ^^^^^^^^  ;-)
> #  A2PS_BASIC="--delegate=no -X iso1 -g"
> #  A2PS_PAPERSIZE="$PAPERSIZE" (case-corrected)
>    ^^^^
>    these are the defaults
> 
> #A2PS_BASIC='-X iso1'
> #don't format troff documents, by Joerg Wunsch <joerg@apsfilter.org>
> #A2PS_BASIC='-Eplain'
> #A2PS_PAPERSIZE=Letter
> #A2PS_PAPERSIZE=A4stylus
>  ^^^^
>  these are examples

Sorry, I have not noticed the "defaults:" line, probably because there
is no blank space between the A2PS_BASIC default and following two
A2PS_BASIC examples, nor - at least - "examples:" line :))

Michal.

-- 
  Michal Szymanski (msz@astrouw.edu.pl)
  Warsaw University Observatory, Warszawa, POLAND