package ExtUtils::Command;

use 5.00503;
use strict;
use Carp;
use File::Copy;
use File::Compare;
use File::Basename;
use File::Path qw(rmtree);
require Exporter;
use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION);
@ISA       = qw(Exporter);
@EXPORT    = qw(cp rm_f rm_rf mv cat eqtime mkpath touch test_f chmod 
                dos2unix);
$VERSION = '1.07';

my $Is_VMS = $^O eq 'VMS';

=head1 NAME

ExtUtils::Command - utilities to replace common UNIX commands in Makefiles etc.

=head1 SYNOPSIS

  perl -MExtUtils::Command       -e cat files... > destination
  perl -MExtUtils::Command       -e mv source... destination
  perl -MExtUtils::Command       -e cp source... destination
  perl -MExtUtils::Command       -e touch files...
  perl -MExtUtils::Command       -e rm_f files...
  perl -MExtUtils::Command       -e rm_rf directories...
  perl -MExtUtils::Command       -e mkpath directories...
  perl -MExtUtils::Command       -e eqtime source destination
  perl -MExtUtils::Command       -e test_f file
  perl -MExtUtils::Command       -e chmod mode files...
  ...

=head1 DESCRIPTION

The module is used to replace common UNIX commands.  In all cases the
functions work from @ARGV rather than taking arguments.  This makes
them easier to deal with in Makefiles.

  perl -MExtUtils::Command -e some_command some files to work on

I<NOT>

  perl -MExtUtils::Command -e 'some_command qw(some files to work on)'

Filenames with * and ? will be glob expanded.

=over 4

=cut

# VMS uses % instead of ? to mean "one character"
my $wild_regex = $Is_VMS ? '*%' : '*?';
sub expand_wildcards
{
 @ARGV = map(/[$wild_regex]/o ? glob($_) : $_,@ARGV);
}


=item cat 

Concatenates all files mentioned on command line to STDOUT.

=cut 

sub cat ()
{
 expand_wildcards();
 print while (<>);
}

=item eqtime src dst

Sets modified time of dst to that of src

=cut 

sub eqtime
{
 my ($src,$dst) = @ARGV;
 local @ARGV = ($dst);  touch();  # in case $dst doesn't exist
 utime((stat($src))[8,9],$dst);
}

=item rm_rf files....

Removes directories - recursively (even if readonly)

=cut 

sub rm_rf
{
 expand_wildcards();
 rmtree([grep -e $_,@ARGV],0,0);
}

=item rm_f files....

Removes files (even if readonly)

=cut 

sub rm_f {
    expand_wildcards();

    foreach my $file (@ARGV) {
        next unless -f $file;

        next if _unlink($file);

        chmod(0777, $file);

        next if _unlink($file);
            
        carp "Cannot delete $file: $!";
    }
}

sub _unlink {
    my $files_unlinked = 0;
    foreach my $file (@_) {
        my $delete_count = 0;
        $delete_count++ while unlink $file;
        $files_unlinked++ if $delete_count;
    }
    return $files_unlinked;
}


=item touch files ...

Makes files exist, with current timestamp 

=cut 

sub touch {
    my $t    = time;
    expand_wildcards();
    foreach my $file (@ARGV) {
        open(FILE,">>$file") || die "Cannot write $file:$!";
        close(FILE);
        utime($t,$t,$file);
    }
}

=item mv source... destination

Moves source to destination.  Multiple sources are allowed if
destination is an existing directory.

Returns true if all moves succeeded, false otherwise.

=cut 

sub mv {
    expand_wildcards();
    my @src = @ARGV;
    my $dst = pop @src;

    croak("Too many arguments") if (@src > 1 && ! -d $dst);

    my $nok = 0;
    foreach my $src (@src) {
        $nok ||= !move($src,$dst);
    }
    return !$nok;
}

=item cp source... destination

Copies source to destination.  Multiple sources are allowed if
destination is an existing directory.

Returns true if all copies succeeded, false otherwise.

=cut

sub cp {
    expand_wildcards();
    my @src = @ARGV;
    my $dst = pop @src;

    croak("Too many arguments") if (@src > 1 && ! -d $dst);

    my $nok = 0;
    foreach my $src (@src) {
        $nok ||= !copy($src,$dst);
    }
    return $nok;
}

=item chmod mode files...

Sets UNIX like permissions 'mode' on all the files.  e.g. 0666

=cut 

sub chmod {
    local @ARGV = @ARGV;
    my $mode = shift(@ARGV);
    expand_wildcards();

    if( $Is_VMS ) {
        foreach my $idx (0..$#ARGV) {
            my $path = $ARGV[$idx];
            next unless -d $path;

            # chmod 0777, [.foo.bar] doesn't work on VMS, you have to do
            # chmod 0777, [.foo]bar.dir
            my @dirs = File::Spec->splitdir( $path );
            $dirs[-1] .= '.dir';
            $path = File::Spec->catfile(@dirs);

            $ARGV[$idx] = $path;
        }
    }

    chmod(oct $mode,@ARGV) || die "Cannot chmod ".join(' ',$mode,@ARGV).":$!";
}

=item mkpath directory...

Creates directory, including any parent directories.

=cut 

sub mkpath
{
 expand_wildcards();
 File::Path::mkpath([@ARGV],0,0777);
}

=item test_f file

Tests if a file exists

=cut 

sub test_f
{
 exit !-f $ARGV[0];
}

=item dos2unix

Converts DOS and OS/2 linefeeds to Unix style recursively.

=cut

sub dos2unix {
    require File::Find;
    File::Find::find(sub {
        return if -d;
        return unless -w _;
        return unless -r _;
        return if -B _;

        local $\;

	my $orig = $_;
	my $temp = '.dos2unix_tmp';
	open ORIG, $_ or do { warn "dos2unix can't open $_: $!"; return };
	open TEMP, ">$temp" or 
	    do { warn "dos2unix can't create .dos2unix_tmp: $!"; return };
        while (my $line = <ORIG>) { 
            $line =~ s/\015\012/\012/g;
            print TEMP $line;
        }
	close ORIG;
	close TEMP;
	rename $temp, $orig;

    }, @ARGV);
}

=back

=head1 BUGS

Should probably be Auto/Self loaded.

=head1 SEE ALSO 

ExtUtils::MakeMaker, ExtUtils::MM_Unix, ExtUtils::MM_Win32

=head1 AUTHOR

Nick Ing-Simmons C<ni-s@cpan.org>

Currently maintained by Michael G Schwern C<schwern@pobox.com>.

=cut

