#!/usr/bin/perl

use strict;
use warnings;

use Getopt::Std;

our $opt_t;
getopts('t:') or die "bad option";



my $stowdir = "/tmp/stow-$>";
mkdir $stowdir;

-e '_darcs' || die "not in darcs dir";

my $sum = `( darcs whatsnew ; darcs changes) | md5sum`;
chomp $sum;
$sum =~ s/\s.*//;

print STDERR "stow: sum=$sum\n";

my $target = $opt_t;
$target or die "must specify target with -t";

my $sfile = "$stowdir/$sum-$target";

if(-e "$stowdir/$sum-$target") {
    if(system "cp -f '$sfile' '$target'") { unlink "$target"; die "could not copy";}
    print STDERR "found $sfile -> $target\n";
    exit 0;
}


system @ARGV and die "could not make $target";

-e $target || die "target not built";

if(system "cp -f '$target' '$sfile'")  { unlink "$sfile"; die "could not copy";}

print STDERR "stow $target -> $sfile\n";

exit 0;



#BUILD_STOW='perl utils/stow.prl -t $@  -- ' make