How to find the class-file on case insensitive filesystem? - perl

Question

Simple test case (for the demonstration of the problem):
mkdir -p ./lib1/Class ./lib2/Class
touch ./lib1/Class/Name.pm ./lib2/Class/NAME.pm
So, have:
./lib1/Class/Name.pm
./lib2/Class/NAME.pm
Need search for the right file in the case-insensitive filesystem (OS X's HFS+).
The following works on case-sensitive filesystem,
#!/usr/bin/env perl
use 5.014;
use strict;
use warnings;
my #DIRS = qw(./lib1 ./lib2);
for my $class ( qw(Class::Name Class::NAME) ) {
my $file = findClassFile($class);
say $file;
}
sub findClassFile {
my($file) = #_;
$file =~ s|::|/|g;
$file .= ".pm";
for my $dir (#DIRS) {
return "$dir/$file" if( -e "$dir/$file" );
}
return undef;
}
and prints
./lib1/Class/Name.pm
./lib2/Class/NAME.pm
on the OS X, it prints incorrectly:
./lib1/Class/Name.pm
./lib1/Class/NAME.pm
How to find on the OSX's insensitive filesystem the correct filename?
Ps: Now only comes to my mind write and recursive routine with opendir/readdir/chdir and checking the filenames what are comes from readdir. Not to shabby... Exists some more easy way?

Answer 1

My current solution is:
#!/usr/bin/env perl
use 5.014;
use strict;
use warnings;
my #DIRS = qw(./lib1 ./lib2 /Users/me/tmp/lib3);
for my $class ( qw(Class::Name Class::NAME CLASS::name Class::Namex) ) {
my $file = findClassFile($class);
say $file // "Not found $class";
}
sub findClassFile {
my($classname) = #_;
my $file = ($classname =~ s|::|/|gr) . ".pm";
for my $dir (#DIRS) {
return "$dir/$file" if( FileExists("$dir/$file") );
}
return undef;
}
sub FileExists {
my($path) = #_;
my $curr = $path =~ m|^/| ? "/" : ".";
for my $part (split '/', $path) {
next unless $part;
opendir(my $dfd, $curr) || return undef;
my #files = grep {/^$part$/} readdir($dfd);
closedir($dfd);
return undef unless( #files );
$curr .= "/$part";
}
return $curr;
}
what prints:
./lib1/Class/Name.pm
./lib2/Class/NAME.pm
/Users/me/tmp/lib3/CLASS/name.pm
Not found Class::Namex
so - it's working, only don't like it.. ;)