How can you get a handle on the directory that a module is located in from within that module's code?
Try __FILE__. See perldata, section "special literals". Drop the file's basename from that string, possibly using File::Basename.
A test revealed that this can produce a relative path; rel2abs() from File::Spec::Functions can remedy that.
For example, test module Foo.pm:
package Foo;
use File::Spec::Functions qw(rel2abs);
use File::Basename;
my $dir = (fileparse(rel2abs(__FILE__)))[1];
print "Foo directory: $dir\n";
1;
IMO it's safest to indeed set a variable with this directory in the top level of the module, as I do here, so it always gets set when the module is loaded.
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