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#!/usr/bin/env perl
# This file is a part of TeX package EasyDTX, available at
# https://ctan.org/pkg/easydtx and https://github.com/sasozivanovic/easydtx.
#
# Copyright (c) 2023- Saso Zivanovic <saso.zivanovic@guest.arnes.si>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
# The files belonging to this work and covered by LPPL are listed in
# <texmf>/doc/support/easydtx/FILES.
use strict;
use Getopt::Long;
my $usage = <<END;
EasyDTX: convert .edtx into .dtx
Usage: edtx2dtx filename.edtx > filename.dtx
END
my $VERSION = '0.1.0';
my ($help, $print_version);
GetOptions(
"help|h|?" => \$help,
"version|V" => \$print_version,
) or die $usage;
if ($help) {print($usage); exit 0}
if ($print_version) { print("edtx2dtx $VERSION\n"); exit 0 }
die $usage unless @ARGV == 1;
sub begin_macrocode { print("% \\begin{macrocode}\n"); }
sub end_macrocode { print("% \\end{macrocode}\n"); }
sub process_edtx {
my $indoc = 1;
while (<>) {
if (/^% \\end{macrocode}/) { # trailer starts here
end_macrocode unless ($indoc);
last;
} elsif (/^% \\begin{macrocode}/) {
die "Nested \\begin{macrocode}";
} elsif (/^ *(%%+)/) { # code: multiple comments
begin_macrocode if ($indoc);
print;
$indoc = 0;
} elsif (/^%(<[^>]*>)(.*)$/) { # code: unindented guard
begin_macrocode if ($indoc);
print;
$indoc = 0;
} elsif (/^( *)%(<[^>]*>) *(.*)$/) { # code: indented guard
begin_macrocode if ($indoc);
print("%$2$1$3\n");
$indoc = 0;
} elsif (/^% *(.*)$/) { # doc: unindented comment
end_macrocode unless ($indoc);
print;
$indoc = 1;
} elsif (/^( ?)( *)% *(.*)$/) { # doc: indented comment
end_macrocode unless ($indoc);
print "%$2$3\n";
$indoc = 1;
} else { # code
begin_macrocode if ($indoc);
print;
$indoc = 0;
}
}
}
my $edtx = @ARGV[0];
my $dtx = $edtx;
$dtx =~ s/\.edtx$/.dtx/;
my $first = 1;
while (<>) {
if ($first and s/$edtx +(.*)/$dtx (generated from $edtx by edtx2dtx)/) {
print;
$first = 0;
} elsif (/^% \\begin{macrocode}/) {
process_edtx;
} elsif (/^% \\end{macrocode}/) {
die "\\end{macrocode} without the opening \\begin{macrocode}!";
} else {
print;
}
}
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