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#!/usr/bin/env perl
# $Id$
# Public domain.  Originally written 2007, Karl Berry.
# 
# Remove a package from the TeX Live source repository.  We use this on
# the source tree when a package becomes obsolete, gets merged, or
# whatever.  It doesn't handle package removals from an installed tree.

our $mydir;

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

use strict;

use TeXLive::TLConfig qw/$RelocPrefix $RelocTree/;
use TeXLive::TLPDB;
use TeXLive::TLPSRC;
use TeXLive::TLUtils;
use Pod::Usage;
use Getopt::Long;

my $opt_help = 0;

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

exit (&main ());


sub main {
  my $failure_count = 0;

  chomp (my $Master = `cd $mydir/../.. && pwd`);
  # cd anywhere would do, but if in tlpsrc the .tlpsrc file itself
  # is listed incorrectly as directly under Master.
  chdir ($Master) || die "chdir($Master) failed: $!";
  
  my $tlpdb = TeXLive::TLPDB->new ("root" => $Master);

  foreach my $f (@ARGV) {
    my $obj = $tlpdb->get_package ($f);
    if (! $obj) {
      warn "$0: no TeX Live package named $f.\n";
      $failure_count++;
      next;
    }

    my @files = $obj->all_files;
    if ($obj->relocated) {
      s,^$RelocPrefix/,$RelocTree/, foreach @files;
    }

    my $tlpsrc = new TeXLive::TLPSRC;
    $tlpsrc->from_file ("$f.tlpsrc");
    push (@files, $tlpsrc->_srcfile); # also want to remove the tlpsrc file.

    # The paths in tlpdb are relative to Master, so we chdir there so
    # that Cwd::abs_path can work.
    chdir ($Master) || die "chdir($Master) failed: $!";

    # Commonly, we want to remove entire directories, not just all the
    # files in the directory.
    my @removals = TeXLive::TLUtils::collapse_dirs (@files);
    my $removals = join ("", map { "$_\n" } @removals);

    my $TMPDIR = $ENV{"TMPDIR"} || "/tmp";
    my $rm_file = "$TMPDIR/tlprm.rm";
    unlink ($rm_file);
    `printf "$removals" >$rm_file`;

    my $commit_file = "$TMPDIR/tlprm.commit";
    unlink ($commit_file);
    `printf "$removals" >$commit_file`;

    print "if license in Catalogue is free, and package isn't, "
          . "tell ctan\@dante.de\n";

    # Remove dependencies from tlpsrc; show with line numbers for next-error.
    # depend lines alone are not enough, as dependencies are also in
    # fmttriggers attributes, set through variables. Better to show all
    # possibilities with a word match (could also be done through a
    # regexp) and accept some false positives.
    my $tsrc = "$Master/tlpkg/tlpsrc";
    my @lines = `grep -Hnw '$f' $tsrc/*`;
    print "first edit collections:\n", @lines if @lines;
    
    # but just file names for commit list.
    my @coll_files = @lines;  # get 
    s/:.*// for @coll_files;
    `printf "@coll_files" >>$commit_file`;
    
    my $check_script = "$Master/tlpkg/bin/tlpkg-ctan-check";
    @lines = `egrep -nH '( |^)$f( |\$)' $check_script`;
    if (@lines) {
      print @lines;
      `echo $check_script >>$commit_file`;
    }

    # e.g., insert a die.  The ideal would be to find the nearest
    # alphabetically to the package name.
    print "$Master/tlpkg/libexec/ctan2tds:500: no resurrection\n";
    `echo $Master/tlpkg/libexec/ctan2tds >>$commit_file`;

    print "\nsvn remove `cat $rm_file`\n";
    print "svn commit -m\"rm $f, \$REASON\" `cat $commit_file`\n";

    if (1) {  # maybe only if debugging?
      print "\n\f ", @removals + 0, " removals ($rm_file):\n";
      print `cat $rm_file`;
      #
      chomp (my $ncommits = `wc -l <$commit_file`);
      print "\n\f ", $ncommits, " commits ($commit_file):\n";
      print `cat $commit_file`;
      #
      print "\n\f ", @files + 0, " files being removed:\n";
      print "$_\n" foreach @files;
    }
  }

  # Instead of rewriting the database here, I think we're better off
  # just doing it nightly or whatever.

  return $failure_count;
}

__END__

=head1 NAME

tlprm - remove a TeX Live package

=head1 SYNOPSIS

tlprm [OPTION]... [TLPKG]...

=head1 OPTIONS

The standard options B<-q>, B<-v>, and B<-logfile>=I<file> are
accepted; see the C<process_logging_options> function in
L<TeXLive::TLUtils> for details.

=head1 DESCRIPTION

B<tlprm> merely prints Subversion commands to remove TeX Live packages
from the source repository, e.g., when a package becomes obsolete or
merged. It does not execute any commands, remove anything, modify the
TeX Live package database or actually do anything else.

It also reports any dependencies (collections, schemes, other packages)
on the package, likely including some false positives. The person who
runs it must exercise judgement in which dependencies to remove, update,
etc.

=head1 AUTHORS AND COPYRIGHT

This script and its documentation were written for the TeX Live
distribution (L<http://tug.org/texlive>) and both are licensed under the
GNU General Public License Version 2 or later.

=cut

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