Re: Making targets that ignore :child

Adriaan de Groot:

> [Another "gosh, I just figured this out and felt like sharing" message.]
> 
> Sometimes, you don't need AAP to read all the child recipes in a given
> recipe.  For example, you might have a target 'foo' defined in a
> recipe that you _know_ doesn't need anything from the children. More
> concretely, you might put this in a recipe where you're developing the
> sources yourself:
> 
> cvs-update {virtual} :
> 	:sys cvs update
> 
> (sure, you can probably use AAP's specific CVS support to better
> effect, but you get the idea). Now if you run "aap cvs-update", then
> surely there's no point in AAP reading in all the :child recipes that
> might occur here.  Actually, if you're running this target, you don't
> need AAP to do anything else.
> 
> The list of targets given on the command line is stored in
> Global.cmd_args.targets. So you can inspect that in your recipe, and
> for instance only do :child commands if no target is specifically
> named on the command line. You could use this Python snippet:
> 
> @if not Global.cmd_args.targets:
>     # :child commands go here
> 
> Of course, doing that makes many other targets - like "aap clean" and
> "aap install" useless as well, since for those targets you do want the
> children to be read. So a better approach is to check explicitly for
> the target(s) that obviate the need for children:
> 
> @if not "cvs-update" in Global.cmd_args.targets:
>     # :child commands

Although this mechanism is good, using the undocumented
"Global.cmd_args" is not a good idea.  Instead use the has_targetarg()
function.  An even more reliable method is also using
has_build_target():

	@if has_build_target() and not has_targetarg("cvs-update"):
		# :child commands


Hmm, only that this doesn't work when doing "aap cvs-update all",
because the presence of the "cvs-update" target will prefent the child
commands to be used, while they are needed for the "all" target.
But you probably won't do that anyway, since the "cvs-update" might
update the recipes.  Anyway, perhaps has_build_target() should accept a
list of targets that are not considered build targets, besides the
default ones.

-- 
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has been on the wrong end of, say, a peasants' revolt will know that in
skilled hands it is fearsome.
					-- (Terry Pratchett, Mort)

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///          Creator of Vim - Vi IMproved -- http://www.Vim.org          \\\
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