What variables are accessible to a command?

[Terrence M. Brannon]

If I write a command for use within a rule, what variables are accessible to that command and how?

I have a working rule, which is entirely perl:

$(EDAN_EL): $(WARES)$(GEST)
    perl {{
    use File::Butler;   
    my $lines = Butler('init.el', 'read');
    my $loc = sprintf "$WARES$GEST";
    $lines =~ s/__LOC__/$loc/g;
    Butler( $EDAN_EL, prepend => \$lines );
    }}

I want to abstract this out as a command, but am not sure what variables I will need to pass and which ones will be available to it.

I think this would make good doc material in the Extending section.

[Daniel Pfeiffer]

http://makepp.sourceforge.net/1.50/makepp_variables.html#variables_and_perl

I don't get the point of your sprintf above.

I don't know File::Butler and the doc CPAN manages to extract is rather scanty.  But it looks to me like the mpp builtins will do all that butler can and much more.  If I understand the above right, it's the same as:

$(EDAN_EL): $(WARES)$(GEST)
    &sed s/__LOC__/$(input)/g init.el -o $(output)

Which doesn't make sence.  I guess you want:

$(EDAN_EL): init.el
    &sed s/__LOC__/$(WARES)$(GEST)/g $(input) -o $(output)