File Coverage

blib/lib/Acme/require/case.pm

Criterion	Covered	Total	%
statement	70	85	82.3
branch	18	28	64.2
condition			n/a
subroutine	13	13	100.0
pod	0	1	0.0
total	101	127	79.5

use 5.008001;
use strict;
use warnings;
no warnings qw/once redefine/;

package Acme::require::case;
# ABSTRACT: Make Perl's require case-sensitive

our $VERSION = '0.013';

use B;
use Carp qw/croak/;
use Path::Tiny qw/path/;
use Scalar::Util qw/isvstring/;
use Sub::Uplevel qw/uplevel/;
use version 0.87;

sub require_casely {
    my ($filename) = @_;
    my ( $realfilename, $result, $valid, $actual );

    # Are we checking a version number?
    if ( _looks_like_version($filename) ) {
        my $v = eval { version->new($filename) };
        croak $@ if $@;
        croak "Perl @{[$v->normal]} required--this is only $^V, stopped"
          if $v > $^V;
        return 1;
    }

    # Is it already loaded?
    if ( exists $INC{$filename} ) {
        return 1 if $INC{$filename};
        croak "Compilation failed in require";
    }

    # Absolute or relative?
    if ( path($filename)->is_absolute ) {
        ( $valid, $actual ) = ( 1, $filename );
        $realfilename = path($filename);
    }
    else {
        foreach my $inc (@INC) {
            if ( ref $inc ) {
                croak "Acme::require::case does not support refs in \@INC";
            }
            else {
                my $prefix = path($inc);
                $realfilename = $prefix->child($filename);
                if ( $realfilename->is_file ) {
                    ( $valid, $actual ) = _case_correct( $prefix, $filename );
                    last;
                }
            }
        }
        croak "Can't locate $filename in \@INC (\@INC contains @INC)"
          unless $actual;
    }

    # Valid case or invalid?
    if ($valid) {
        $INC{$filename} = $realfilename;
        # uplevel so calling package looks right
        my $caller = caller(0);
        # deletes $realfilename from %INC after loading it since that's
        # just a proxy for $filename, which is already set above
        my $code = qq{
            package $caller; sub { local %^H; my \$r = do \$_[0]; delete \$INC{\$_[0]}; \$r }
          };
        my $packaged_do = eval $code; ## no critic
        $result = uplevel( 2, $packaged_do, $realfilename );
    }
    else {
        croak "$filename has incorrect case (maybe you want $actual instead?)";
    }

    # Loaded correctly or not?
    if ($@) {
        $INC{$filename} = undef;
        croak $@;
    }
    elsif ( !$result ) {
        delete $INC{$filename};
        croak "$filename did not return a true value";
    }
    else {
        $! = 0;
        return $result;
    }
}

sub _case_correct {
    my ( $prefix, $filename ) = @_;
    my $search = path($prefix);         # clone
    my @parts  = split qr{/}, $filename;
    my $valid  = 1;
    while ( my $p = shift @parts ) {
        if ( grep { $p eq $_ } map { $_->basename } $search->children ) {
            $search = $search->child($p);
        }
        else {
            $valid = 0;
            my ($actual) = grep { lc $p eq lc $_ } map { $_->basename } $search->children;
            $search = $search->child($actual);
        }
    }
    return ( $valid, $search->relative($prefix) );
}

sub _looks_like_version {
    my ($v) = @_;
    return 1 if isvstring($v);
    return B::svref_2object( \$v )->FLAGS & ( B::SVp_NOK | B::SVp_IOK );
}

*CORE::GLOBAL::require = \&require_casely;

1;


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