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# $Id: papersize-setting.pl 11574 2008-12-10 00:06:21Z preining $
#
# Adjusting and querying paper sizes from various config files
#
# Copyright 2008, 2009 Norbert Preining
# This file is licensed under the GNU General Public License version 2
# or any later version.
#
# TODO TODO TODO
# if no paperconfig line is found in paper_do_simple it adds to the end of the
# file the new line, but this does not work on context because it 
# has an \endinput at the end ... needs to be fixed

package TeXLive::TLPaper;

=pod

=head1 NAME

C<TeXLive::TLPaper> -- paper size setting

=head1 SYNOPSIS

  use TeXLive::TLPaper;

=head1 DESCRIPTION

=over 4

=cut

use TeXLive::TLUtils qw(:DEFAULT dirname merge_into mkdirhier);

use open qw(:utf8 :std);

my %paper_sub = (
  "xdvi"     => \&paper_xdvi,
  "pdftex"   => \&paper_pdftex,
  "dvips"    => \&paper_dvips,
  "dvipdfmx" => \&paper_dvipdfmx,
  "dvipdfm"  => \&paper_dvipdfm,
  "context"  => \&paper_context,
);

# Where to write to by default.
my %default_paper_config_path_component = (
  "xdvi"     => "xdvi/XDvi",
  "pdftex"   => "tex/generic/config/pdftexconfig.tex",
  "dvips"    => "dvips/config/config.ps",
  "dvipdfmx" => "dvipdfmx/dvipdfmx.cfg",
  "dvipdfm"  => "dvipdfm/config/config",
  "context"  => "tex/context/user/cont-sys.tex",
);

# Output is done to the components in this hash.
# If a value is undefined, we take the one from %default_...
#
my %paper_config_path_component;


my %xdvi_papersize = (
  "a1"       => "59.4x84.0cm",
  "a1r"      => "84.0x59.4cm",
  "a2"       => "42.0x59.4cm",
  "a2r"      => "59.4x42.0cm",
  "a3"       => "29.7x42.0cm",
  "a3r"      => "42.0x29.7cm",
  "a4"       => "21.0x29.7cm",
  "a4r"      => "29.7x21.0cm",
  "a5"       => "14.85x21.0cm",
  "a5r"      => "21.0x14.85cm",
  "a6"       => "10.5x14.85cm",
  "a6r"      => "14.85x10.5cm",
  "a7"       => "7.42x10.5cm",
  "a7r"      => "10.5x7.42cm",
  "b1"       => "70.6x100.0cm",
  "b1r"      => "100.0x70.6cm",
  "b2"       => "50.0x70.6cm",
  "b2r"      => "70.6x50.0cm",
  "b3"       => "35.3x50.0cm",
  "b3r"      => "50.0x35.3cm",
  "b4"       => "25.0x35.3cm",
  "b4r"      => "35.3x25.0cm",
  "b5"       => "17.6x25.0cm",
  "b5r"      => "25.0x17.6cm",
  "b6"       => "13.5x17.6cm",
  "b6r"      => "17.6x13.5cm",
  "b7"       => "8.8x13.5cm",
  "b7r"      => "13.5x8.8cm",
  "c1"       => "64.8x91.6cm",
  "c1r"      => "91.6x64.8cm",
  "c2"       => "45.8x64.8cm",
  "c2r"      => "64.8x45.8cm",
  "c3"       => "32.4x45.8cm",
  "c3r"      => "45.8x32.4cm",
  "c4"       => "22.9x32.4cm",
  "c4r"      => "32.4x22.9cm",
  "c5"       => "16.2x22.9cm",
  "c5r"      => "22.9x16.2cm",
  "c6"       => "11.46x16.2cm",
  "c6r"      => "16.2x11.46cm",
  "c7"       => "8.1x11.46cm",
  "c7r"      => "11.46x8.1cm",
  "foolscap" => "13.5x17.0",
  "ledger"   => "17.0x11.0",
  "legal"    => "8.5x14",
  "letter"   => "8.5x11",
  "tabloid"  => "11.0x17.0",
  "us"       => "8.5x11",
  "usr"      => "11x8.5",
);

my %pdftex_papersize = (
  "a4"     => [ '210 true mm', '297 true mm' ],
  "letter" => [ '8.5 true in', '11 true in' ],
);

my %dvipdfm_papersize = (
  "a3" => 1,
  "a4" => 1,
  "ledger" => 1, 
  "legal" => 1,
  "letter" => 1,
  "tabloid" => 1,
);




=item C<get_paper_list($prog)>

Returns the list of supported paper sizes with the first entry being
the currently selected one.

=cut

sub get_paper_list {
  my $prog = shift;
  return ( &{$paper_sub{$prog}} ( "/dummy", "--returnlist" ) );
}

=item C<do_paper($prog,$texmfsysconfig,@args)>

Call the paper subroutine for C<$prog>, passing args.

=cut

sub do_paper {
  my ($prog,$texmfsysconfig,@args) = @_;
  my @ret = ();
  if (exists $paper_sub{$prog}) {
    my $sub = $paper_sub{$prog};
    @ret = &$sub($texmfsysconfig, @args);
  } else {
    tlwarn("$0: unknown paper program $prog ($texmfsysconfig,@args)\n");
  }
  return @ret;
}


=item C<paper_all($texmfsysconfig, $newpaper)>

Pass all C<@args> to each paper subroutine in turn, thus setting the
paper size for all supported programs.  Return merge of all returned
hashes.

=cut

sub paper_all {
  for my $p (sort keys %paper_sub) {
    &{$paper_sub{$p}} (@_);
  }
}


# return the config file to look in by running kpsewhich with the
# specified PROGNAME, FORMAT, and @FILENAMES.  If no result, give a
# warning and return the empty string.
# 
sub find_paper_file {
  my ($progname, $format, @filenames) = @_;
  my $ret = "";
  
  my $cmd;
  for my $filename (@filenames) {
    $cmd = qq!kpsewhich --progname=$progname --format="$format" $filename!;
    chomp($ret = `$cmd`);
    if ($ret) {
      debug("paper file for $progname ($format) $filename: $ret\n");
      last;
    }
  }

  tlwarn("$0: found no paper file for $progname (from $cmd)\n") if ! $ret;
  return $ret;
}


# xdvi format:
# /--- XDvi ---
# |...
# |*paper: <NAME>
# |...
# \------------
#
# Reading is done via --progname=xdvi --format='other text files' XDvi
# Writing is done to TEXMFSYSCONFIG/xdvi/XDvi
#
sub paper_xdvi {
  my $outtree = shift;
  my $newpaper = shift;

  my $inp = &find_paper_file("xdvi", "other text files", "XDvi");
  return unless $inp; 
  
  my $outcomp = $paper_config_path_component{"xdvi"}
                || $default_paper_config_path_component{"xdvi"};
  my $outfile = "$outtree/$outcomp";

  my @sizes = keys %xdvi_papersize;
  return &paper_do_simple($inp, "xdvi", '^\*paper: ', '^\*paper:\s+(\w+)\s*$',
            sub {
              my ($ll,$np) = @_;
              $ll =~ s/^\*paper:\s+(\w+)\s*$/\*paper: $np\n/;
              return($ll);
            }, $outfile, \@sizes, '(undefined)', '*paper: a4', $newpaper);
}


# pdftex pdftexconfig.tex format
# /--- pdftexconfig.tex ---
# |...
# |\pdfpagewidth=NNN true <unit>
# |\pdfpageheight=NNN true <unit>
# |...
# \------------------------
#
# Reading is done via --progname=pdftex --format='tex' pdftexconfig.tex
# Writing is done to TEXMFSYSCONFIG/tex/generic/config/pdftexconfig.tex
#
sub paper_pdftex {
  my $outtree = shift;
  my $newpaper = shift;

  my $outcomp = $paper_config_path_component{"pdftex"}
                || $default_paper_config_path_component{"pdftex"};
  my $outfile = "$outtree/$outcomp";
  
  my $inp = &find_paper_file("pdftex", "tex", "pdftexconfig.tex");
  return unless $inp; 

  open(FOO, "<$inp") || die "$0: open($inp) failed: $!";
  my @lines = <FOO>;
  close(FOO);

  my ($cpw, $cph);
  my ($cpwidx, $cphidx);
  my $endinputidx;
  # read the lines and the last pdfpageswidth/height wins
  for my $idx (0..$#lines) {
    my $l = $lines[$idx];
    if ($l =~ m/^\s*\\pdfpagewidth\s*=?\s*(.+)\s*$/) {
      $cpw = $1;
      $cpwidx = $idx;
      next;
    }
    if ($l =~ m/^\s*\\pdfpageheight\s*=?\s*(.+)\s*$/) {
      $cph = $1;
      $cphidx = $idx;
      next;
    }
    if ($l =~ m/^\s*\\endinput\s*/) {
      $endinputidx = $idx;
      next;
    }
  }
  # trying to find the right papersize
  #
  my $currentpaper;
  if (defined($cpw) && defined($cph)) {
    for my $pname (keys %pdftex_papersize) {
      my ($w, $h) = @{$pdftex_papersize{$pname}};
      if (($w eq $cpw) && ($h eq $cph)) {
        $currentpaper = $pname;
        last;
      }
    }
  } else {
    $currentpaper = "(undefined)";
  }
  $currentpaper || ($currentpaper = "$cpw x $cph");
  if (defined($newpaper)) {
    if ($newpaper eq "--list") {
      info("$currentpaper\n");
      for my $p (keys %pdftex_papersize) {
        info("$p\n") unless ($p eq $currentpaper);
      }
    } elsif ($newpaper eq "--returnlist") {
      my @ret = ();
      push @ret, "$currentpaper";
      for my $p (keys %pdftex_papersize) {
        push @ret, $p unless ($p eq $currentpaper);
      }
      return @ret;
    } else {
      my $found = 0;
      for my $p (keys %pdftex_papersize) {
        if ($p eq $newpaper) {
          $found = 1;
          last;
        }
      }
      if ($found) {
        my $newwline = 
          '\pdfpagewidth=' . ${$pdftex_papersize{$newpaper}}[0] . "\n";
        my $newhline = 
          '\pdfpageheight=' . ${$pdftex_papersize{$newpaper}}[1] . "\n";
        if (defined($cpwidx)) {
          $lines[$cpwidx] = $newwline;
        } else {
          if (defined($endinputidx)) {
            $lines[$endinputidx] = $newwline . $lines[$endinputidx];
          } else {
            $lines[$#lines] = $newwline;
          }
        }
        if (defined($cphidx)) {
          $lines[$cphidx] = $newhline;
        } else {
          if (defined($endinputidx)) {
            $lines[$endinputidx] = $newhline . $lines[$endinputidx];
          } else {
            $lines[$#lines] = $newwline;
          }
        }
        info("$0: setting paper size for pdftex to $newpaper.\n");
        mkdirhier(dirname($outfile));
        # if we create the outfile we have to call mktexlsr
        TeXLive::TLUtils::announce_execute_actions("files-changed")
          unless (-r $outfile);
        if (!open(TMP, ">$outfile")) {
          tlwarn("$0: Cannot write to $outfile: $!\n");
          tlwarn("Not setting paper size for pdftex.\n");
          return;
        }
        for (@lines) { print TMP; }
        close(TMP) || warn "$0: close(>$outfile) failed: $!";
        TeXLive::TLUtils::announce_execute_actions("regenerate-formats");
      } else {
        tlwarn("$0: Not a valid paper size for pdftex: $newpaper\n");
      }
    }
  } else {
    info("Current pdftex paper size (from $inp): $currentpaper\n");
  }
}


# dvips config.ps format:
# /--- config.ps ---
# |...
# |stuff not related to paper sizes
# |...
# | <empty line>
# |% some comments
# |% more comments
# |@ <NAME> <WIDTH> <HEIGHT>
# |@+ ...definition line
# |@+ ...definition line
# |... more definition lines
# |@+ %%EndPaperSize
# |
# |@ <NAME> <WIDTH> <HEIGHT>
# |...
# \------------
#
# the first paper definition is the default
# selecting paper is done like with texconfig which used ed to move the
# selected part between @ $selected_paper .... @ /-1 (the line before the
# next @ line) to the line before the first @  line.
# (what a tricky ed invocation te created there, impressive!!!)
#
# Reading is done via --progname=dvips --format='dvips config' config.ps
# Writing is done to TEXMFSYSCONFIG/dvips/config/config.ps
#
sub paper_dvips {
  my $outtree = shift;
  my $newpaper = shift;

  my $inp = &find_paper_file("dvips", "dvips config", "config.ps");
  return unless $inp; 
  
  my $outcomp = $paper_config_path_component{"dvips"}
                || $default_paper_config_path_component{"dvips"};
  my $outfile = "$outtree/$outcomp";

  open(FOO, "<$inp") || die "$0: open($inp) failed: $!";
  my @lines = <FOO>;
  close(FOO);

  my @papersizes;
  my $firstpaperidx;
  my %startidx;
  my %endidx;
  my $in_block = "";
  my $idx = 0;
  for my $idx (0 .. $#lines) {
    if ($lines[$idx] =~ m/^@ (\w+)/) {
      $startidx{$1} = $idx;
      $firstpaperidx || ($firstpaperidx = $idx-1);
      $in_block = $1;
      push @papersizes, $1;
      next;
    }
    # empty lines or comments stop a block
    if ($in_block) {
      if ($lines[$idx] =~ m/^\s*(%.*)?\s*$/) {
        $endidx{$in_block} = $idx-1;
        $in_block = "";
      }
      next;
    }
  }

  if (defined($newpaper)) {
    if ($newpaper eq "--list") {
      for my $p (@papersizes) {
        info("$p\n"); # first is already the selected one
      }
    } elsif ($newpaper eq "--returnlist") {
      return(@papersizes);
    } else {
      my $found = 0;
      for my $p (@papersizes) {
        if ($p eq $newpaper) {
          $found = 1;
          last;
        }
      }
      if ($found) {
        my @newlines;
        for my $idx (0..$#lines) {
          if ($idx < $firstpaperidx) {
            push @newlines, $lines[$idx];
            next;
          }
          if ($idx == $firstpaperidx) { 
            # insert the selected paper definition
            push @newlines, @lines[$startidx{$newpaper}..$endidx{$newpaper}];
            push @newlines, $lines[$idx];
            next;
          }
          if ($idx >= $startidx{$newpaper} && $idx <= $endidx{$newpaper}) {
            next;
          }
          push @newlines, $lines[$idx];
        }
        info("$0: setting paper size for dvips to $newpaper.\n");
        mkdirhier(dirname($outfile));
        # if we create the outfile we have to call mktexlsr
        TeXLive::TLUtils::announce_execute_actions("files-changed")
          unless (-r $outfile);
        if (!open(TMP, ">$outfile")) {
          tlwarn("$0: Cannot write to $outfile: $!\n");
          tlwarn("Not setting paper size for dvips.\n");
          return ();
        }
        for (@newlines) { print TMP; }
        close(TMP) || warn "$0: close(>$outfile) failed: $!";
      } else {
        tlwarn("$0: Not a valid paper size for dvips: $newpaper\n");
      }
    }
  } else {
    info("Current dvips paper size (from $inp): $papersizes[0]\n");
  }
}


# dvipdfm(x) format:
# /--- dvipdfm/config, dvipdfmx/dvipdfmx.cfg ---
# |...
# |p <NAME>
# |...
# \------------
#
# Reading is done
#  for dvipdfm via --progname=dvipdfm --format='other text files' config
#  for dvipdfmx via --progname=dvipdfmx --format='other text files' dvipdfmx.cfg
# Writing is done to TEXMFSYSCONFIG/dvipdfm/config/config 
# and /dvipdfmx/dvipdfmx.cfg
#
#
sub do_dvipdfm_and_x {
  my ($inp,$prog,$outtree,$paplist,$newpaper) = @_;
  my $outcomp = $paper_config_path_component{$prog}
                || $default_paper_config_path_component{$prog};
  my $outfile = "$outtree/$outcomp";
  return &paper_do_simple($inp, $prog, '^p\s+', '^p\s+(\w+)\s*$',
            sub {
              my ($ll,$np) = @_;
              $ll =~ s/^p\s+(\w+)\s*$/p $np\n/;
              return($ll);
            }, $outfile, $paplist, '(undefined)', 'p a4', $newpaper);
}

sub paper_dvipdfm {
  my $outtree = shift;
  my $newpaper = shift;

  my $inp = &find_paper_file("dvipdfm", "other text files", "config");
  return () unless $inp; 

  my @sizes = keys %dvipdfm_papersize;
  return &do_dvipdfm_and_x($inp, "dvipdfm", $outtree, \@sizes, $newpaper);
}

sub paper_dvipdfmx {
  my $outtree = shift;
  my $newpaper = shift;

  my $inp = &find_paper_file("dvipdfmx", "other text files", "dvipdfmx.cfg");
  return () unless $inp; 

  my @sizes = keys %dvipdfm_papersize;
  return &do_dvipdfm_and_x($inp, "dvipdfmx", $outtree, \@sizes, $newpaper);
}


# context format:
# /--- cont-sys.{tex,rme}
# |...
# |\setuppapersize[letter][letter]
# |...
# \------------
# 
sub paper_context {
  my $outtree = shift;
  my $newpaper = shift;

  my $outcomp = $paper_config_path_component{"context"}
                || $default_paper_config_path_component{"context"};
  my $outfile = "$outtree/$outcomp";

  my $inp = &find_paper_file("context", "tex", "cont-sys.tex", "cont-sys.rme");
  return () unless $inp; 

  my @sizes = keys %pdftex_papersize;
  # take care here, the \\\\ are necessary in some places and not in 
  # some others because there is no intermediate evaluation
  return &paper_do_simple($inp, "context", '^\s*\\\\setuppapersize\s*', 
            '^\s*\\\\setuppapersize\s*\[([^][]*)\].*$',
            sub {
              my ($ll,$np) = @_;
              if ($ll =~ m/^\s*\\setuppapersize\s*/) {
                return("\\setuppapersize[$np][$np]\n");
              } else {
                return($ll);
              }
            }, 
            $outfile, \@sizes, 'a4', '\setuppapersize[a4][a4]', $newpaper);
}


# paper_do_simple does the work for single line config files
# (xdvi, dvipdfm, ...)
# arguments:
#   $inp, $prog, $firstre, $secondre, $bl, $outp, $paplist, $newpaper
# with
# $inp .. input file location
# $prog .. program name
# $firstre .. re that searches for paper lines
# $secondre .. re that extracts the paper from a paper line
# $bl .. block/sub taking two args, one paper line and the new paper, and
#        returns the line with the paper configured, only lines mathing
#        $firstre are shipped over to $bl
# $outp .. location of the output file
# $paplist .. ref to an array with the list of admissible paper sizes
# $defaultpaper .. default papersize (arbitrary string) if the $firstre is
#        not found in the config file
# $defaultline .. the line to be added at the bottom of the file if
#        no line has been found
# $newpaper .. --list, new paper, or undef
sub paper_do_simple {
  my ($inp, $prog, $firstre, $secondre, $bl, $outp, $paplist, $defaultpaper, $defaultline, $newpaper) = @_;

  debug("file used for $prog: $inp\n");

  open(FOO, "<$inp") or die("cannot open file $inp: $!");
  my @lines = <FOO>;
  close(FOO);

  my $currentpaper;
  my @paperlines = grep (m/$firstre/,@lines);
  if (!@paperlines) {
    $currentpaper = $defaultpaper;
  } else {
    if ($#paperlines > 0) {
      warn "Strange, more than one paper definiton, using the first one in\n$inp\n";
    }
    $currentpaper = $paperlines[0];
    chomp($currentpaper);
    $currentpaper =~ s/$secondre/$1/;
  }

  # change value
  if (defined($newpaper)) {
    if ($newpaper eq "--list") {
      info("$currentpaper\n");
      for my $p (@$paplist) {
        info("$p\n") unless ($p eq $currentpaper);
      }
    } elsif ($newpaper eq "--returnlist") {
      my @ret = ();
      push @ret, $currentpaper;
      for my $p (@$paplist) {
        push @ret, $p unless ($p eq $currentpaper);
      }
      return(@ret);
    } else {
      my $found = 0;
      for my $p (@$paplist) {
        if ($p eq $newpaper) {
          $found = 1;
          last;
        }
      }
      if ($found) {
        my @newlines;
        my $foundcfg = 0;
        for my $l (@lines) {
          if ($l =~ m/$firstre/) {
            push @newlines, &$bl($l, $newpaper);
            $foundcfg = 1;
          } else {
            push @newlines, $l;
          }
        }
        # what to do if no default line found???
        if (!$foundcfg) {
          push @newlines, &$bl($defaultline, $newpaper);
        }
        info("$0: setting paper size for $prog to $newpaper.\n");
        mkdirhier(dirname($outp));
        # if we create the outfile we have to call mktexlsr
        TeXLive::TLUtils::announce_execute_actions("files-changed")
          unless (-r $outp);
        if (!open(TMP, ">$outp")) {
          tlwarn("$0: Cannot write to $outp: $!\n");
          tlwarn("Not setting paper size for $prog.\n");
          return;
        }
        for (@newlines) { print TMP; }
        close(TMP) || warn "$0: close(>$outfile) failed: $!";
        TeXLive::TLUtils::announce_execute_actions("regenerate-formats")
          if ($prog eq "context");
      } else {
        tlwarn("$0: Not a valid paper size for $prog: $newpaper\n");
      }
    }
  } else {
    # return the current value
    info("Current $prog paper size (from $inp): $currentpaper\n");
  }
}

1;

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