[cairo] CAIRO_DEBUG, take 2
mathieu.lacage at sophia.inria.fr
Thu May 8 08:19:36 PDT 2008
On Thu, 2008-05-08 at 22:45 +0930, Adrian Johnson wrote:
> > To enable the debugging output, one simply sets the CAIRO_DEBUG
> > environment
> > variable to the list of facilities desired.
> > $ CAIRO_DEBUG=option1[,option2[,...]]; export CAIRO_DEBUG
> > e.g.
> > $ CAIRO_DEBUG=backtrace,abort; export CAIRO_DEBUG
> > Alternatively, you can use any of " ,;:|" as the separator between
> > options.
> I think that allowing all these separators may create problems if in
> future we want to have options that use various types of separators
> within an option. For example "option=value1,value2",
> "option_range=low:high" or "option_flags=foo|bar". I would prefer that
> we choose only one separator. We can print a help message describing the
> option syntax if there was an error parsing the options.
In our project, I implemented something similar and one of my users
rightfully pointed out that using ';' or '|' as a separator is really a
bad idea from the POV of the shell. i.e., CAIRO_DEBUG=foo;bar requires
quoting to work: CAIRO_DEBUG='foo;bar'. We ended up supporting only the
':' separator to parallel PATH-style variables.
hope this helps,
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