Re: Using _recipe in python snippts

Adriaan de Groot wrote:

> In order to test if a variable is set, I've taken to using
> _recipe.has_key() - something like this:
> 
> :if _recipe.has_key("SUBDIRS"):
> 	:child $SUBDIRS
> 
> I couldn't quickly find another way to do this.

That works fine when $SUBDIRS is set (or not) in the recipe where you
use this.  I often use get(), so that an empty value is ignored (and
it's shorter! :-):

    :if _recipe.get("SUBDIRS"):
 	:child $SUBDIRS

> Now the problem is that _recipe doesn't always exist. In particular,
> suppose I have a main.aap in .,./a,and ./a/a that looks like this:

"_recipe" should always exist.  It stands for the scope of the current
recipe and there always is a current recipe.

> ==main.aap
> :child a/main.aap
> ==
> 
> Finally, in ./a/a/a, main.aap looks lile:
> ==main.aap
> :print $TOPDIR
> @if _recipe.has_key("SUBDIRS"):
> 	:child $SUBDIRS
> ==
> 
> If I run AAP on this setup, AAP tells me (paraphrased): recipe "a"# does
> not exist. I haven't quite figured out how to convice AAP that it _does_
> exist - adding :program targets in each recipe doesn't seem to make a
> difference.
> 
> So how _should_ I be testing for the existence of a variable in a Python
> snippet?

It looks like your $SUBDIRS is set in another recipe, thus in another
scope.  You should probably use the "_no" scope, which works like using
$SUBDIRS without specifying a scope (thus the name "no scope").

    @if _no.get("SUBDIRS"):
 	:child $SUBDIRS

Does that work for you?

I know that "_no" is a strange name to use for a scope, I still haven't
come up with a better name.

-- 
hundred-and-one symptoms of being an internet addict:
113. You are asked about a bus schedule, you wonder if it is 16 or 32 bits.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///          Creator of Vim - Vi IMproved -- http://www.Vim.org          \\\
\\\              Project leader for A-A-P -- http://www.A-A-P.org        ///
 \\\  Help AIDS victims, buy here: http://ICCF-Holland.org/click1.html  ///


-------------------------------------------------------
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa00100003ave/direct;at.aspnet_072303_01/01