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#!/usr/bin/env perl
# $Id$
# Public domain.  Originally written 2005, Karl Berry.
# 
# Return information given a TL package name (i.e., a tlpsrc file name).
# With -rev (--revision) argument given, returns only the revision number
# of the package (see below for details).
# We require local copies of CTAN and the TeX Catalogue.

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

exit (&main ());

sub main {
  if ($#ARGV >= 0 && ($ARGV[0] =~ m/^--?rev(ision)?$/)) {
    &tlpkgrevision();
  } else {
    &ctaninfo ();
  }
}

sub tlpkgrevision {
  # output and exit codes:
  # repository not found or no modules available there
  #	output: -1	exit code: 1
  #	stderr warning
  # package not found:
  #	output: 0	exit code: 1
  #	stderr warning
  # both found
  #	output: rev	exit code: 0
  #
  #   tlpkginfo -revision <pkg> [ <tltree> ]
  require TeXLive::TLPOBJ;
  require TeXLive::TLPDB;
  die "need at least pkg name as argument!" if ($#ARGV < 1);
  if ($#ARGV == 2) {
    $root = $ARGV[2];
  } else {
    $root = "$mydir/../..";
  }
  my $tlpdb = TeXLive::TLPDB->new ("root" => $root);
  if (!defined($tlpdb)) {
    printf STDERR "Cannot find tlpdb in $root\n";
    print "-1";
    exit(1);
  }
  my $pkg = $tlpdb->get_package($ARGV[1]);
  if (!defined($pkg)) {
    printf STDERR "Cannot find $ARGV[1] package\n";
    print "0";
    exit(1);
  }
  print $pkg->revision;
  exit(0);
}


sub ctaninfo {
  $CTAN = $ENV{"CTAN"} || "/home/ftp/tex-archive";
  $TMPDIR = $ENV{"TMPDIR"} || "/tmp";
  $CATALOGUE = $ENV{"TEX_CATALOGUE"} || "/home/httpd/html/catalogue/entries";
  -d "$CATALOGUE/k"
    || die "$0: TEX_CATALOGUE ($CATALOGUE) must point to entries/ subdir"
           . " of a TeX Catalogue checkout.\n";
  
  # erroneous or problematic tds files (when new, tell CTAN and author)
  $erroneous_tds = join ("|",
    qw(alertmessage countriesofeurope dad ebproof engpron gost
       hacm imtekda mathdesign tufte-latex xassoccnt),
    );
  
  # Heiko's tds files (don't propagate through CTAN fast enough).
  # Heiko is no longer actively maintaining,disable.
  $oberdiek_tds = "no-hyperref|no-oberdiek";

  # special packages from latex-tds project; used by prepare()
  $latex_tds_pkgs  = "latex-tds";
  $latex_tds_pkgs .= "|psnfss"; # amsmath|cyrillic|graphics|latex|tools on own
  $latex_tds_pkgs .= "|knuth";  # other
  $latex_tds_dir = "$CTAN/macros/latex/contrib/latex-tds";
  
  # the CJK material is split into several packages.
  $cjk_pkgs = "bin-(cjk|ttf)utils|dnp|(|garuda-|norasi-)c90";

  if ($ARGV[0] eq "--ctan-dir") {
    my $output = &find_ctan_dir ($ARGV[1], 0);
    print "$output\n";
    return $output ? 0 : 1;

  } elsif ($ARGV[0] eq "--prepare") {
    my $output = &prepare ($ARGV[1]);
    print "$output\n" if $output;  # if no $output, errors elsewhere
    return $output ? 0 : 1;

  } elsif ($ARGV[0] eq "--ctan-root") {
    print "$CTAN\n";
    return 0;

  } else {
    die "Usage: $0 --ctan-dir PKGNAME\n" 
      . "   or:  --prepare PKGNAME\n"
      . "   or:  --ctan-root\n"
      . "(not \"@ARGV\").\n";
  }
}


# Return the location on CTAN for PKGNAME, or 1 if no PKGNAME or the
# location can't be found.
# 
# If DO_COPY is nonzero, construct a working directory and return that.
# 
sub find_ctan_dir {
  my ($pkgname,$do_copy) = @_;
  return 1 unless $pkgname;  
  
  # use explicit catalogue name if given in tlpsrc.
  my $me = &tlpsrc_find_catalogue ($pkgname);
  if (! $me) {
    if ($pkgname =~ /^($cjk_pkgs)$/) {
      # ctan bundles these packages together,
      # but we use separate tlp names.
      $me = "cjk";  # likewise CJK
    } elsif ($pkgname eq "mkgrkindex") {
      $me = "greek-makeindex";  # use directory name
    } else {
      $me = $pkgname;  # usually the same
    }
  }

  # The CTAN path to a package is sometimes stored in the TeX Catalogue,
  # but old entries don't have it, etc.  Still, we want to use it if present.
  my $ctan_dir = &catalogue_find_ctan_path ($me, $do_copy);
#warn "find_ctan_dir: got $ctan_dir\n";
  if (! $ctan_dir) {
    # fall back on many special cases
    (my $me_wo_bin = $me) =~ s,^bin-,,;
    (my $me_wo_powerdot = $me) =~ s,^powerdot-,,;
    (my $me_wo_type1 = $me) =~ s,-type1$,,;

    for my $dir (
      "macros/latex/contrib/$me",		# most everything
      "macros/latex/contrib/biblatex/$me",	# authoryear-icomp-tt      
      "macros/latex/contrib/biblatex-contrib/$me", # biblatex-*
      "macros/latex/contrib/gene/$me",		# eqname
      "macros/latex/contrib/\L$me",		# HA-prosper
      "macros/latex/contrib/powerdot/contrib/$me_wo_powerdot", # powerdot-doc-vn
      "macros/latex/exptl/$me",			# semioneside
      "macros/latex/required/$me",		# babel
      "macros/xetex/latex/$me",			# xetex
      "macros/xetex/generic/$me",		# harvardkyoto
      "macros/plain/$me",			# plnfss
      "macros/plain/contrib/$me",		# timetable
      "macros/luatex/latex/$me",		# luabidi
      "macros/generic/$me",			# abbr
      "macros/generic/diagrams/$me",		# circ
      "macros/context/contrib/$me",		# context
      "support/$me",				# thumbpdf
      "support/$me_wo_bin",			# bin-thumbpdf
      "language/vietnamese/$me/unpacked",	# vntex
      "language/polish/$me",			# cc-pl
      "language/hyphenation/$me",		# bghyphen
      "language/hebrew/$me",			# cjhebrew
      "language/greek/package-babel/$me",	# ibycus-babel
      "language/devanagari/$me",		# velthuis
      "language/croatian/$me",			# hrlatex
      "language/coptic/$me",			# cbcoptic
      "language/japanese/$me",			# e.g., jfontmaps
      "info/spanish/$me",			# guia-bibtex
      "info/symbols/$me",			# comprehensive
      "info/math/voss/$me",			# mathmode
      "info/challenges/$me",			# AroBend
      "info/bibtex/$me",			# tamethebeast
      "info/$me",				# Type1fonts
      "help/$me",				# es-tex-faq
      "graphics/$me",				# sparklines
      "macros/pdftex/$me",			# mptopdf
      "graphics/metapost/contrib/macros/$me",	# mpattern
      "graphics/pgf/contrib/$me",		# celtic
      "graphics/pictex/addon/$me",		# autoarea
      "graphics/pstricks/contrib/pedigree/$me",	# pst-pdgr
      "graphics/pstricks/contrib/$me",		# pstricks-add
      "fonts/$me",				# MnSymbol
      "fonts/utilities/$me",			# accfonts
      "fonts/ps-type1/$me",			# cm-super
      "fonts/ps-type1/$me_wo_type1",		# esint-type1
      "fonts/greek/$me",			# lfb
      "fonts/gothic/$me",			# blacklettert1
      "fonts/cyrillic/$me/texmf",		# lh
      "fonts/chess/$me",			# skaknew
      "biblio/bibtex/contrib/$me",		# dk-bib
                 ) {
      if (-d "$CTAN/$dir") {
        $ctan_dir = $dir;
        last;
      }
    }

    # names totally dissimilar
    $ctan_dir = "fonts/fourier-GUT" if $me eq "fourier";
    $ctan_dir = "fonts/manual/ps-type1/hoekwater" if $me eq "manfnt-font";
    $ctan_dir = "graphics/pdftex" if $me eq "pdftex-def";
    $ctan_dir = "info/biblio" if $me eq "beebe";
    $ctan_dir = "info/epslatex/french" if $me eq "epslatex-fr";
    $ctan_dir = "info/impatient/cn" if $me eq "impatient-cn";
    $ctan_dir = "info/impatient/fr" if $me eq "impatient-fr";
    $ctan_dir = "info/italian/amsldoc" if $me eq "amsldoc-it";
    $ctan_dir = "info/italian/amsthdoc" if $me eq "amsthdoc-it";
    $ctan_dir = "info/l2tabu/italian" if $me eq "l2tabu-it";
    $ctan_dir = "info/latex2e-help-texinfo/spanish" if $me eq "latex2e-help-texinfo-spanish";
    $ctan_dir = "info/lshort/chinese" if $me eq "lshort-chinese";
    $ctan_dir = "info/tex-references" if $me eq "tex-refs";
    $ctan_dir = "info/translations/vn" if $me eq "ntheorem-vn";
    $ctan_dir = "language/armenian/armtex" if $me eq "armenian";
    $ctan_dir = "language/basque" if $me eq "hyphen-basque";
    $ctan_dir = "language/hyphenation/dehyph" if $me eq "hyphen-german";
    $ctan_dir = "language/hyphenation/elhyphen" if $me eq "hyphen-greek";
    $ctan_dir = "macros/generic" if $me eq "genmisc";
    $ctan_dir = "macros/latex/contrib/misc" if $me eq "ltxmisc";
    $ctan_dir = "macros/latex/contrib/t2/cyrplain" if $me eq "cyrplain";

    # do last, for sake of subdirs above.
    $ctan_dir = "language/hyphenation"
      if $me =~ /^hyphen-/ && ! $ctan_dir;
  }

  if ($me eq "cm") {
    # For cm, we just want the mf subdir of fonts/cm.
    $ctan_dir .= "/mf";

  } elsif ($pkgname eq "cmexb") {
    # not in Catalogue as yet, 27apr16.
    $ctan_dir = "macros/cstex/base";
    
  } elsif ($pkgname eq "cs") {
    # For cs, we need to unpack from multiple tarballs,
    # so copy the entire cstex directory.
    $ctan_dir = "$CTAN/macros/cstex/base";

  } elsif ($me eq "mathspic") {
    # For mathspic, we cannot use the catalogue directory:
    # we want to ignore the dos/ subdir and just go with the perl/.
    $ctan_dir .= "/perl";
  
  } elsif ($me eq "sauter") {
    # and for sauter, just base.
    $ctan_dir .= "/base";
  }                         
  
  # prepend ctan root if not an absolute dir (this happens when we make
  # a temp dir).
  $ctan_dir = "$CTAN/$ctan_dir"
    if defined $ctan_dir && $ctan_dir =~ m,^[^/],;
  return $ctan_dir;
}


# If the .tlpsrc file for ME specifies a catalogue entry, return it,
# else return empty string.
# 
sub tlpsrc_find_catalogue {
  my ($me) = @_;
  
  chomp (my $mydir = `dirname $0`);
  chomp (my $tlpsrcdir = `cd $mydir/../tlpsrc && /bin/pwd`);
  my $tlpsrc = "$tlpsrcdir/$me.tlpsrc";
  if (! -r $tlpsrc) {
    warn "$0: no tlpsrc $tlpsrc\n";
    return "";
  }

  chomp (my $cat = `awk '\$1 == "catalogue" {print \$2}' $tlpsrc`);
  return $cat;
}


# Look up ctan path for given PKGNAME in catalogue entry.
# xml is too hard to parse, so just look for the <ctan path...> entry.
# 
# Return the ctan path if found (without leading /), or undef.
# Except that if DO_COPY is nonzero, construct a working directory and
# return that.
# 
sub catalogue_find_ctan_path {
  my ($pkgname,$do_copy) = @_;
  
  # catalogue uses all-lowercase file/directory names.
  my $firstchar = substr (lc ($pkgname), 0, 1);
  my $catfile =  "$CATALOGUE/$firstchar/$pkgname.xml";
  return undef unless -r $catfile;

  # get the raw tag from the catalogue file.
  open (CATFILE, "<$catfile") || die "open($catfile) failed, fixme: $!";
  while ($ctan_path = <CATFILE>) {
    last if $ctan_path =~ /<ctan /;
  }
  if (! $ctan_path) { # give up if the tag wasn't there.
    close CATFILE;
    return undef;
  } 
  # if we found the tag, read more lines until we get to the end of the value.
  while ($ctan_path !~ m,/>,) {
    $ctan_path .= <CATFILE>;
  }
  close CATFILE;
  $ctan_path =~ s/\n/ /g;                     # put it on one line 
  ($ctan_path) = ($ctan_path =~ m,(<.*?/>),); # remove angle brackets
  return undef unless $ctan_path;             # if it's not present at all

  # extract just the dir or file name, without options, etc.
  $ctan_path =~ m,path=(["'])/(.*?)\1,;
  $ctan_loc = $2;
  return undef unless $ctan_loc; # should never happen, but who knows

  # if the Catalogue lists the path as a single file, there are two
  # possibilities: (1) it really is a single file, e.g., texilikecover,
  # in which case we copy that file into a temp dir and return that temp
  # dir; (2) it is actually in its own directory, e.g., ifxetex, in
  # which case we return undef here and let the code above find it.
  # (The Catalogue maintainers do not consider this a problem.)
  # 
  # Subcase of (2): package name is babel-hungarian, but CTAN path is
  # babel-contrib/hungarian.  Sigh.
  # 
#warn "catalogue ctan path $ctan_path, pkg $pkgname\n";
  my $ret;
  if ($ctan_path =~ /file='true'/) {
    (my $ctan_babel_path = $ctan_path) =~ s,babel-contrib/,babel-,;
    if ($ctan_path =~ m,/$pkgname/,
        || $ctan_babel_path =~ m,/$pkgname/,) {
      $ret = undef;   # pkg dir somewhere in path.
    } else {
      $ret = $do_copy # are we called by prepare() or not? 
        ? &copy_to_tmpdir ($pkgname, "$CTAN/$ctan_loc")
        : "$CTAN/$ctan_loc";
    }
  } else {
    # not a single file, so use the regular ctan location.  
    $ret = "$CTAN/$ctan_loc";
  }

#warn "catalogue returning $ret\n";
  return $ret;
}

# 
# Create a tmpdir with the tds-ready tree for PKG unpacked, if it exists,
# else return the normal ctan dir for PKG.  Return undef if no package
# or can't find any ctan directory.
#
sub prepare {
  my ($pkg) = @_;
  return undef unless $pkg;

  # find the real ctan dir and return it if our tds is erroneous
  my $ctan_loc = &find_ctan_dir ($pkg, 1); # pass do_copy=1
#warn "prepare: ctan_loc for $pkg = $ctan_loc\n";
  return $ctan_loc if $pkg =~ /^($erroneous_tds)$/;

  # tds path is usually in ctan/install...
  my $tds_path = $ctan_loc ? "$ctan_loc.tds.zip" : "";
  $tds_path =~ s,^$CTAN,$CTAN/install,;

  # ...except for heiko, when running on tug.org...
  if ($pkg =~ /^($oberdiek_tds)$/) {
    $tds_path = "/home/ftp/tex/$pkg/$pkg.tds.zip";
    # will be ignored below if it doesn't exist.

  # ...and except for context, and plenty more...
  # We really need to get the install path out of the Catalogue entry.
  } elsif ($pkg eq "context") {
    $tds_path = "/home/ftp/mirror/www.pragma-ade.com/context/beta/cont-tmf.zip";

  } elsif ($pkg eq "cmexb") {
    # as with enctex case
    $tds_path = "$CTAN/macros/cstex/base/cmexb.tar.gz";

  } elsif ($pkg eq "enctex") {
    # not tds, but we eliminate the TDS_READY below
    # and do the rest in ctan2tds as usual.
    $tds_path = "$CTAN/systems/enctex/enctex.tar.gz";

  } elsif ($pkg eq "hfoldsty") {
    $tds_path = glob ("$CTAN/fonts/hfoldsty/hfoldsty-v*.zip");

  } elsif ($pkg eq "latex") {
    $tds_path = "$CTAN/install/macros/latex/latex-base.tds.zip";

  } elsif ($pkg =~ /^(amsmath|cyrillic|graphics|tools)$/) {
    $tds_path = "$CTAN/install/macros/latex/required/latex-$pkg.tds.zip";

  } elsif ($pkg eq "pgf") {
    $tds_path = "$CTAN/install/graphics/pgf/base/pgf.tds.zip";

  # ...and except for files in latex-tds...
  } elsif ($pkg =~ /^($latex_tds_pkgs)$/) {
    $tds_path = "$latex_tds_dir/$pkg.tds.zip";
  }

  return $ctan_loc unless (-s $tds_path);
  
  # now we have a tds, so unzip it in a tmpdir and be sure it's readable.
  my $tmpdir = &copy_to_tmpdir ($pkg);
  my $unpack = ($tds_path =~ /zip$/)
               ? "unzip -q -o $tds_path -d $tmpdir"
               : "tar -C $tmpdir -xf $tds_path";
  system ($unpack) == 0 || die "unpack failed: $!\n($unpack)";
  system ("chmod -R a+rX $tmpdir");
  
  # put a sentinel file for ctan2tds' donormal() to work.
  system ("echo $tds_path >$tmpdir/TDS_READY")
    unless $pkg =~ /^(cmexb|enctex)$/; # not tds

  return $tmpdir;
}


# copy file to temp dir and return that for ctan2tl to use.
#
sub copy_to_tmpdir {
  my ($pkgname,$src) = @_;
  
  my $pkgdir = "$TMPDIR/tl.$pkgname";
  system ("rm -rf $pkgdir");
  mkdir ($pkgdir, 0777) || die "mkdir($pkgdir) failed: $!";

  # copying single file $src ...
  system ("cp -p '$src' '$pkgdir/'")
    if $src;

  # there's no real ctan dir for these packages, just zips.
  my $zip = "";
  if ($pkgname eq "cc-pl") {
    $zip = "cc-pl.zip";
  } elsif ($pkgname eq "pl-mf") {
    $zip = "pl-mf.zip";
  } elsif ($pkgname eq "tap") {
    $zip = "tap077.zip";
  }
  if ($zip) {
    system ("cd $pkgdir && unzip -q $zip && rm $zip");
  }
  
  if ($pkgname eq "latex") {
    my $latex_doc_zip = "$CTAN/install/macros/latex/latex-doc.tds.zip";
    system ("cd $pkgdir && unzip -q -o $latex_doc_zip </dev/null");
  }

  # the pl package in TeX Live is a combination of the pl-mf and
  # plpsfont packages on CTAN, per Thomas Esser and GUST as of many
  # years ago.  So combine them.  ctan2tds will flatten everything out,
  # so don't worry about directory levels.
  if ($pkgname eq "pl-mf") {
    my $plpsfont_zip = "$CTAN/language/polish/plpsfont.zip";
    system ("cd $pkgdir && unzip -q $plpsfont_zip");
  }

  return $pkgdir;
}