Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!ncar!csn!cherokee!flash!rampson
From: rampson@flash (Michael T. Rampson)
Newsgroups: comp.lang.perl
Subject: nested requires, name-space override
Message-ID: <1991May22.193037.12166@cherokee.uswest.com>
Date: 22 May 91 19:30:37 GMT
Sender: news@cherokee.uswest.com (Telegraph Row)
Reply-To: rampson@flash (Michael T. Rampson)
Organization: U S WEST
Lines: 47
Nntp-Posting-Host: flash.uswest.com

Howdy,
	I was wondering if you are suppose to be able to do nested requires.
I haven't been able to get them to work ("I get Can't locate dodat.pl in @INC 
at do_this.pl line 1.").  What I'm trying to do is create an abstract interface
of things you have to do to handle different types of program builders
(ie., make, gmake, imake, mkmf, etc).  Originally I found that there was
some invariant code (ie., code that did not depend on what type of make you
were using), and some code that was very specific to the MAKER that you
were using.  But after thinking about it, what I would really like to do
is be able to override a function defined in the default library (default
being things to do with make), with a function that is specific to the MAKER
needed (that would be in another library).  The reason I'm splitting this stuff
out is so that you don't end up basically the same code replicated all over the
place.  Below is an example of what I would like to be able to do.

require 'maker.pl';
&make(blah, blah, target) || die "a horrible death:$!";

maker.pl would look like this
package maker;
eval require $ENV{'MAKER'}.pl;
sub main'make {
	local(blah,blah,$target)=@_;
	'make $target';
	if ($?) {
		warn "make died:$!";
		return(0);
	}
	return(1);
}
1;

an example MAKER.pl would look something like the above only redefine
main'make to do whatever is needed for this particular kind of MAKER.

Any ideas?

__
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analyze all situations, anticipate all problems prior to their
occurrence, have answers for these problems, and move swiftly to solve
these problems when called upon.

However, When you are up to your ass in alligators it is difficult to
remind yourself your initial objective was to drain the swamp.

    	    	    	    	    	    rampson@uswat