There are a huge number of ways to do this. They all boil down to:
my @values = qw(Stuff you want to pass in);
print "Some question\n";
chomp(my $file = <>);
if ($file eq 'A') {
do_A($file, @values);
} elsif ($file eq 'B') {
do_B($file, @values);
} elsif ... {
} else {
complain_that_value_sucks($file, @values);
}
Now, that's a really piss-poor thing, especially if you have more than 5-10 options. So, we can use a dispatch table. This is a preferred method of doing things.
my %dispatch_table = (
A => \&do_A,
B => \&do_B,
C => \&do_C,
);
my @values = qw(Stuff you want to pass in);
print "Some question\n";
chomp(my $file = <>);
my $sub = $dispatch_table{$file} || \&complain_that_value_sucks;
$sub->($file, @values);
Now, the dispatch table can be in a module, built on-the-fly, or whatever. What's happening here is that we're taking references to subroutines and associating them with strings. So, whenever we see a given string, we can map that to the given subroutine. This is very similar (but more powerful) to funcp's in C/C++.
------
We are the carpenters and bricklayers of the Information Age.
The idea is a little like C++ templates, except not quite so brain-meltingly complicated. -- TheDamian, Exegesis 6
Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.
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