#!/usr/bin/perl

# Copyright (C) 1998 Christian Schwarz, Richard Braakman (and others)
# Copyright (C) 2013 Niels Thykier
# Copyright (C) 2014 Jakub Wilk <jwilk@jwilk.net>
# Copyright (C) 2020 Felix Lechner

# This program is free software.  It is distributed under the terms of
# the GNU General Public License as published by the Free Software
# Foundation; either version 2 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, you can find it on the World Wide
# Web at <https://www.gnu.org/copyleft/gpl.html>, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.

use v5.20;
use warnings;
use utf8;

use Const::Fast;
use Cwd qw(realpath);
use File::Basename qw(dirname);

# neither Path::This nor lib::relative are in Debian
use constant THISFILE => realpath __FILE__;
use constant THISDIR => dirname realpath __FILE__;

# use Lintian modules that belong to this program
use lib THISDIR . '/../lib';

# substituted during package build
my $LINTIAN_VERSION;

use Const::Fast;
use Getopt::Long ();
use Path::Tiny;
use Unicode::UTF8 qw(encode_utf8 decode_utf8);

use Lintian::Spelling qw(check_spelling check_spelling_picky);
use Lintian::Profile;
use Lintian::Version qw(guess_version);

const my $EMPTY => q{};
const my $SPACE => q{ };

$SIG{__WARN__} = sub {
    my ($message) = @_;

    $message =~ s/\A([[:upper:]])/lc($1)/e;
    $message =~ s/\n+\z//;

    die encode_utf8("spellintian: $message\n");
};

if (my $coverage_arg = $ENV{'LINTIAN_COVERAGE'}) {
    my $p5opt = $ENV{'PERL5OPT'} // $EMPTY;
    $p5opt .= $SPACE if $p5opt ne $EMPTY;
    $ENV{'PERL5OPT'} = "${p5opt} ${coverage_arg}";
}

$ENV{LINTIAN_BASE} = realpath(THISDIR . '/..')
  // die encode_utf8('Cannot resolve LINTIAN_BASE');

$ENV{LINTIAN_VERSION} = $LINTIAN_VERSION // guess_version($ENV{LINTIAN_BASE});
die encode_utf8('Unable to determine the version automatically!?')
  unless length $ENV{LINTIAN_VERSION};

my @INCLUDE_DIRS;
my $picky = 0;
my $user_dirs = 1;

my %options = (
    'h|help' => \&show_help,
    'include-dir=s' => \@INCLUDE_DIRS,
    'picky' => \$picky,
    'user-dirs!' => \$user_dirs,
    'version' => \&show_version,
);

Getopt::Long::Configure('gnu_getopt');

Getopt::Long::GetOptions(%options)
  or die encode_utf8("error parsing options\n");

my $PROFILE = Lintian::Profile->new;
$PROFILE->load(undef, \@INCLUDE_DIRS, $user_dirs);

my $exit_code = 0;

unless (@ARGV) {
    my $text = do { local $/ = undef; decode_utf8(<STDIN>) };
    spellcheck($PROFILE->data, undef, $picky, $text);
}

for my $path (@ARGV) {

    unless (-r $path) {
        print {*STDERR} encode_utf8("$path is not a readable file\n");
        $exit_code = 1;

        next;
    }

    my $text = path($path)->slurp_utf8;
    spellcheck($PROFILE->data, $path, $picky, $text);
}

exit $exit_code;

sub show_version {
    say encode_utf8("spellintian v$ENV{LINTIAN_VERSION}");

    exit;
}

sub show_help {
    my $message =<<'EOF' ;
Usage: spellintian [--picky] [FILE...]

Options:
    --picky            be extra picky
    --include-dir DIR  check for Lintian data in DIR
    --[no-]user-dirs   whether to include profiles from user directories
    --version          show version info and exit
EOF

    print encode_utf8($message);

    exit;
}

sub spellcheck {
    my ($lintian_data, $path, $be_picky, $text) = @_;

    my $prefix = $path ? "$path: " : $EMPTY;

    my $spelling_error_handler = sub {
        my ($mistake, $correction) = @_;
        say encode_utf8("$prefix$mistake -> $correction");
    };

    check_spelling($lintian_data, $text, $spelling_error_handler);
    check_spelling_picky($lintian_data, $text, $spelling_error_handler)
      if $be_picky;

    return;
}

# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et