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#!/usr/bin/perl
#
# tl-paper
#
# query and change paper settings using TLPaper
# this is independent from tlmgr
#
# Copyright 2011-2015 Norbert Preining
# This file is licensed under the GNU General Public License version 3
# or any later version.
#

BEGIN {
  $^W = 1;
  chomp ($mydir = `dirname $0`);
  unshift (@INC, "/usr/share/texlive/tlpkg");
}

$^W = 1;
use strict;
use Cwd qw/abs_path/;
use Pod::Usage;
use Getopt::Long qw(:config no_autoabbrev permute);
use TeXLive::TLPaper;

# overwrite the default paper config settings
our %paper_config_name = (
  "xdvi"     => "XDvi-paper",
  "pdftex"   => "pdftexconfig.tex",
  "dvips"    => "config-paper.ps",
  "dvipdfmx" => "dvipdfmx-paper.cfg",
  "context"  => "cont-sys-paper.tex",
);

binmode(STDOUT, ":utf8");
binmode(STDERR, ":utf8");

&main();

sub main {
  # the script always runs in sys mode
  chomp(my $texmfsysconfig = `kpsewhich -var-value=TEXMFSYSCONFIG`);
  chomp(my $texmfsysvar = `kpsewhich -var-value=TEXMFSYSVAR`);
  $ENV{"TEXMFCONFIG"} = $texmfsysconfig;
  $ENV{"TEXMFVAR"} = $texmfsysvar;

  my $action = shift @ARGV;
  $action = "status" if !defined($action);
  if ($action =~ m/^status$/i) {  # "tl-paper status" shows the current settings
    TeXLive::TLPaper::paper_all($texmfsysvar,undef);
    
  } elsif ($action =~ m/^list$/i) { # "tl-paper list prg" lists options for prg
    my $prg = shift @ARGV;
    if (!$prg) {
      # currently, pdftex has the most restricted set of paper sizes
      $prg = "pdftex";
    }
    # the following actually also *reads* the configuration and returns
    # a list where the first item is the one selected.
    my $paperref = TeXLive::TLPaper::get_paper_list($prg);
    my ($current_paper, @other_options) = @{$paperref};
    for my $i ($current_paper, sort @other_options) {
      print "$i\n";
    }
    # for simply getting the list of supported paper sizes without reading
    # anything, one can use:
    # my @paper_options = keys(%{${prg}_papersize});

  } elsif ($action =~ m/^set$/i) { # "tl-paper set <prg|all> <paper>" sets paper
    my $prg = shift @ARGV;
    my $newpaper = shift @ARGV;

    if ($prg !~ m/^(xdvi|pdftex|dvips|dvipdfmx|context|all)$/i) {
      usage();
      exit 1;
    }
    # set TEXMFVAR and TEXMFSYSVAR to TEXMFDIST (which is == TEXMFMAIN)
    # so that we always find either the system provided config file
    # as distributed in /usr/share/texlive/texmf-dist, or, if the
    # admin decided to override that, a copy in TEXMFSYSCONFIG
    # but *not* the one we have created at some point in history
    # in TEXMF(SYS)VAR
    chomp(my $texmfdist = `kpsewhich -var-value=TEXMFDIST`);
    $ENV{"TEXMFVAR"} = $ENV{"TEXMFSYSVAR"} = $texmfdist;
    if ($prg =~ m/^all$/i) {
      if ($newpaper !~ /^(a4|letter)$/) {
        # we cannot deal with that for now, only a4|letter supported for
        # all programs
        print "tl-paper: cannot change setting for all programs to $newpaper\n\n";
        exit 1;
      }
      TeXLive::TLPaper::paper_all($texmfsysvar,$newpaper);
    
    } else {
      TeXLive::TLPaper::do_paper($prg,$texmfsysvar,$newpaper);
    }
  
    # we probably have changed the paper, so run the execute actions
    # as announced by TLPaper, that is $::files_changed and 
    # $::regenerate_all_formats.
    #
    # but we do not do this here, but rely on the libpaper shell
    # script to do the rest

  } elsif ($action =~ m/^get$/i) { # "tl-paper get prg" gets paper setting for prg
    my $prg = shift @ARGV;
    if ($prg !~ m/^(xdvi|pdftex|dvips|dvipdfmx|context)$/i) {
      usage();
      exit 1;
    }
    my $paperref = TeXLive::TLPaper::get_paper_list($prg);
    my ($current_paper, @other_options) = @{$paperref};
    print "$current_paper\n" if defined($current_paper);
    
  } else {
    usage();
    exit 1;
  }
  exit 0;
}

sub usage {
  print STDERR "
tl-paper: inquire and set paper settings for various programs in the TeX World.


usage:
  tl-paper list <program>     lists available papers, current paper first
  tl-paper status             lists all current settings
  tl-paper get <program>      prints the current paper for <program>
  tl-paper set <program> <newpaper>    sets new paper for <program>
  tl-paper set all <a4|letter>         sets new paper for all programs

";
}



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