#!/bin/env perl

use 5.010;
use strict;
use warnings;

use Data::Dumper 2.160; # For the TrailingComma option.


sub invalid_combinations {
    my @context    = qw( -A -B -C -p );
    my @pretty     = qw( --heading --group --break );
    my @filename   = qw( -h -H --with-filename --no-filename );
    my @file_lists = qw( -f -g -l -L );
    my @output     = qw( -o --output );
    my @fg         = qw( -f -g );
    my @case       = qw( -i -I --smart-case );

    return (
        [qw(--and)]      => [qw( --or )],
        [qw(-l)]         => [@context, @file_lists, @pretty, @filename, @output, qw(--passthru --column --show-types)],
        [qw(-L)]         => [@context, @file_lists, @pretty, @filename, @output, qw(--passthru --column --show-types -c -v)],
        [@output]        => [@context, @file_lists, @output, qw(-c --column --show-types)],
        [qw(--passthru)] => [@context, @file_lists, @output, qw(-c --column -m -1 -v)],
        [qw(--match)]    => [qw(-f -g)],
        [qw(-m)]         => [@fg, qw(-1 -c)],
        [qw(-h)]         => [@file_lists],
        [qw(-H)]         => [@file_lists],
        [qw(-c)]         => [@context, @pretty, @fg, qw(--column)],
        [qw(--column)]   => [@file_lists],
        [@context]       => [@file_lists],
        [qw(-f)]         => [qw(-v), @case],
        [@fg]            => [@fg, @pretty, qw(-x -c -u --files-from)],
        [qw(-p)]         => [@context, @file_lists, qw(--passthru -c)],
        [qw(-v)]         => [qw(--column -o --output --passthru)],
        [qw(-u)]         => [@fg, qw(--output)],
        [qw(-x)]         => [qw( --files-from )],
    );
}

my %mutex;
my @combos = invalid_combinations();

while ( my ($lefts,$rights) = splice( @combos, 0, 2 ) ) {
    for my $left ( @{$lefts} ) {
        $left =~ s/^-+//;

        for my $right ( @{$rights} ) {
            $right =~ s/^-+//;
            $mutex{$left}->{$right} = 1;
            $mutex{$right}->{$left} = 1;
        }
    }
}

$Data::Dumper::Indent = 1;
$Data::Dumper::Trailingcomma = 1;
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Quotekeys = 0;

my $out = Dumper( \%mutex );
$out =~ s/  /    /g;
$out =~ s/^/    /gsm; # Indent a tabstop
$out =~ s/\$VAR1 =/return/sm;
say $out;

exit 0;