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✏️ Editing: Cygwin.pm

package File::Spec::Cygwin;

use strict;
require File::Spec::Unix;

our $VERSION = '3.74';
$VERSION =~ tr/_//d;

our @ISA = qw(File::Spec::Unix);

=head1 NAME

File::Spec::Cygwin - methods for Cygwin file specs

=head1 SYNOPSIS

require File::Spec::Cygwin; # Done internally by File::Spec if needed

=head1 DESCRIPTION

See L<File::Spec> and L<File::Spec::Unix>.  This package overrides the
implementation of these methods, not the semantics.

This module is still in beta.  Cygwin-knowledgeable folks are invited
to offer patches and suggestions.

=cut

=pod

=over 4

=item canonpath

Any C<\> (backslashes) are converted to C</> (forward slashes),
and then File::Spec::Unix canonpath() is called on the result.

=cut

sub canonpath {
    my($self,$path) = @_;
    return unless defined $path;

$path =~ s|\\|/|g;

# Handle network path names beginning with double slash
    my $node = '';
    if ( $path =~ s@^(//[^/]+)(?:/|\z)@/@s ) {
        $node = $1;
    }
    return $node . $self->SUPER::canonpath($path);
}

sub catdir {
    my $self = shift;
    return unless @_;

# Don't create something that looks like a //network/path
    if ($_[0] and ($_[0] eq '/' or $_[0] eq '\\')) {
        shift;
        return $self->SUPER::catdir('', @_);
    }

$self->SUPER::catdir(@_);
}

=pod

=item file_name_is_absolute

True is returned if the file name begins with C<drive_letter:>,
and if not, File::Spec::Unix file_name_is_absolute() is called.

=cut

sub file_name_is_absolute {
    my ($self,$file) = @_;
    return 1 if $file =~ m{^([a-z]:)?[\\/]}is; # C:/test
    return $self->SUPER::file_name_is_absolute($file);
}

=item tmpdir (override)

Returns a string representation of the first existing directory
from the following list:

$ENV{TMPDIR}
    /tmp
    $ENV{'TMP'}
    $ENV{'TEMP'}
    C:/temp

If running under taint mode, and if the environment
variables are tainted, they are not used.

=cut

sub tmpdir {
    my $cached = $_[0]->_cached_tmpdir(qw 'TMPDIR TMP TEMP');
    return $cached if defined $cached;
    $_[0]->_cache_tmpdir(
        $_[0]->_tmpdir(
            $ENV{TMPDIR}, "/tmp", $ENV{'TMP'}, $ENV{'TEMP'}, 'C:/temp'
        ),
        qw 'TMPDIR TMP TEMP'
    );
}

=item case_tolerant

Override Unix. Cygwin case-tolerance depends on managed mount settings and
as with MsWin32 on GetVolumeInformation() $ouFsFlags == FS_CASE_SENSITIVE,
indicating the case significance when comparing file specifications.
Default: 1

=cut

sub case_tolerant {
  return 1 unless $^O eq 'cygwin'
    and defined &Cygwin::mount_flags;

my $drive = shift;
  if (! $drive) {
      my @flags = split(/,/, Cygwin::mount_flags('/cygwin'));
      my $prefix = pop(@flags);
      if (! $prefix || $prefix eq 'cygdrive') {
          $drive = '/cygdrive/c';
      } elsif ($prefix eq '/') {
          $drive = '/c';
      } else {
          $drive = "$prefix/c";
      }
  }
  my $mntopts = Cygwin::mount_flags($drive);
  if ($mntopts and ($mntopts =~ /,managed/)) {
    return 0;
  }
  eval {
      local @INC = @INC;
      pop @INC if $INC[-1] eq '.';
      require Win32API::File;
  } or return 1;
  my $osFsType = "\0"x256;
  my $osVolName = "\0"x256;
  my $ouFsFlags = 0;
  Win32API::File::GetVolumeInformation($drive, $osVolName, 256, [], [], $ouFsFlags, $osFsType, 256 );
  if ($ouFsFlags & Win32API::File::FS_CASE_SENSITIVE()) { return 0; }
  else { return 1; }
}

=back

=head1 COPYRIGHT

This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

MR SKB