#!/usr/bin/env perl
# $Id$
# Copyright 2008 TeX Users Group.
# This file is licensed under the GNU General Public License version 2
# or any later version.
# 
# Check that the same set of files are wrappers on w32 and symlinks on
# all others.

BEGIN {
  $^W = 1;
  ($mydir = $0) =~ s,/[^/]*$,,;
  unshift (@INC, "$mydir/..");
}

use Getopt::Long;
use Pod::Usage;

our $mydir;
my $help = 0;

GetOptions("help|?"       => \$help) or pod2usage(1);
pod2usage(-exitstatus => 0, -verbose => 2) if $help;

exit (&main ());


sub main
{
  my $err = 0;
  
  chomp (my $Master = `cd $mydir/../.. && pwd`);
  my $bindir = "$Master/bin";
  chdir ($bindir) || die "chdir($bindir) failed: $!";
  
  my %w = &unx_wrapper_entries ("i386-linux");

  # add some additional wrappers which are not found 
  # automatically since they are not .. symlinks on Unix.
  $w{'fmtutil-sys'} = 1;
  $w{'getnonfreefonts-sys'} = 1;
  $w{'updmap'} = 1;
  $w{'updmap-sys'} = 1;

  my $srcdir = "$Master/../Build/source/texk/texlive";
  $cww = "$srcdir/tl-w32-starter.bat";
  $err += &check_w32 ("win32", $cww, %w);

  # one more, the wrapper itself.
  $err += system ("cmp win32/tl-w32-wrapper.texlua"
                  . " $srcdir/tl-w32-wrapper.texlua");
  
  return $err;
}



# return all symlinks starting with ".." in DIR as a hash, with symlink
# targets as the values.  Check that targets are executable.
# 
sub unx_wrapper_entries
{
  my ($DIR) = @_;
  my %ret;
  
  chomp (my $olddir = `pwd`);
  chdir ($DIR) || die "chdir($DIR) failed: $!";

  local *DIR;
  opendir (DIR, ".") || die "opendir($DIR) failed: $!";
  while (my $ent = readdir (DIR)) {
    next unless -l $ent;  # skip all but symlinks

    my $target = readlink ($ent);
    die "readlink($ent) failed: $!" if !defined ($target);
    next unless $target =~ /^\.\./;  # skip all but .. symlinks
    
    # the target of the symlink should be executable.
    warn "$ent: target $target not executable\n" if ! -x $target;

    $ret{$ent} = $target;  # remember name and link target
  }
  closedir (DIR) || warn "closedir($DIR) failed: $!";
  chdir ($olddir) || die "chdir($olddir) failed: $!";

  return %ret;
}



# windows is special, as usual.  given the list of wrappers in UW, check
# that each of those entries exists in W32DIR and is a copy of the
# canonical w32 wrapper specified in W32CANONICAL.
# 
sub check_w32
{
  my ($w32dir, $w32canonical, %uw) = @_;
  my $diff = 0;

  for my $k (sort keys %uw) {
    #print "$k -> $uw{$k}\n";
    my $target = $uw{$k};
    next if $k eq "context";           # has its own .cmd file
    next if $target =~ /dviasm|ebong/; # no .bat for python
    next if $target =~ /ps4pdf/;       # has its own .bat
    next if $target =~ /simpdftex/;    # shell script
    next if $target =~ /tex4ht/;       # tex4ht has its own .bat's
    $diff += system ("cmp $w32dir/$k.bat $w32canonical");
  }

  return $diff;
}