Definitely go for the module approach. Though not that short as I would prefer, the code below demonstrate how you could achieve the effect of "automatically" stuffing your constants into the list of exports of your module.
The code for finding the constant names in the symbol table is almost abstract and with a little effort could be migrated into a generic module, leaving your constant module lighter.
package MyConstants;
use strict;
use warnings;
require Exporter; # you may use other exporter modules
our @EXPORT; # empty by now
use constant FOO => 1;
use constant BOO => 2;
use constant BAR => 3;
# ...
#### here begins the code to find and populate the list of exports wit
+h constant names
our @GLOBAL_SYMBOLS; # these are not package constants, but Perl artif
+acts
BEGIN {
@GLOBAL_SYMBOLS = qw(BEGIN EXPORT);
}
# $ans = is_constant($symbol_name);
#
# decides if a name is a package constant or not.
# Checks if it is all upper-case and not in @GLOBAL_SYMBOLS
sub is_constant {
my $k = shift;
return $k =~ /^[A-Z]+$/
&& !grep { $_ eq $k } @GLOBAL_SYMBOLS
}
# push_constants(\@export, @symbols)
#
# Push @symbol names into @export if they satisfy is_constant
sub push_constants {
my $export_ref = shift;
my @symbols = @_;
for my $s (@_) {
if ( is_constant($s) ) {
#print "s: $s\n";
push @$export_ref, $s
}
}
}
BEGIN {
# iterate the package stash
my @keys = do { no strict 'refs'; keys %{__PACKAGE__ . '::'} };
push_constants(\@EXPORT, @keys);
}
print "export: @EXPORT\n";
#### here ends the code to find and populate the list of exports with
+constant names
1;
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