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    sprintf("%s%s", $text, " " x ($w-ta_length($text)));
}

$SPEC{gen_monthly_calendar} = {
    v => 1.1,
    summary => 'Generate a single month calendar',
    description => <<'_',

Return [\@lines, \@hol]

_
    args => {
        month => {
            schema => ['int*' => between => [1, 12]],
            req => 1,
        },
        year => {
            schema => ['int*'],
            req => 1,
        },
        show_year_in_title => {
            schema => ['bool', default => 1],
        },
        show_prev_month_days => {
            schema => ['bool', default => 1],
        },
        show_next_month_days => {
            schema => ['bool', default => 1],
        },
        show_holiday_list => {
            schema => ['bool', default => 1],
        },
        show_joint_leave => {
            schema => ['bool', default => 0],
        },
        highlight_today => {
            schema => [bool => default => 1],
        },
        time_zone => {
            schema => 'str*',
        },
    },
    "x.perinci.sub.wrapper.disable_validate_args" => 1,
    result_naked => 1,
};
sub gen_monthly_calendar {
    my %args = @_;
    my $m = $args{month};
    my $y = $args{year};

    my @lines;
    my $tz = $args{time_zone} // $ENV{TZ} // "UTC";
    my $dt  = DateTime->new(year=>$y, month=>$m, day=>1, time_zone=>$tz);
    my $dtl = DateTime->last_day_of_month(year=>$y, month=>$m, time_zone=>$tz);
    my $dt_today = DateTime->today(time_zone=>$tz);
    my $hol = list_id_holidays(
        detail => 1, year => $y, month => $m,
        (is_joint_leave => 0) x !$args{show_joint_leave},
    )->[2];

    # XXX use locale
    if ($args{show_year_in_title} // 1) {
        push @lines, _center(21, sprintf("%s %d", $month_names->[$m-1], $y));
    } else {
        push @lines, _center(21, sprintf("%s", $month_names->[$m-1]));
    }

    push @lines, "Sn Sl Rb Km Jm Sb Mg"; # XXX use locale (but TBH locale's versions suck: Se Se Ra Ka Ju Sa Mi)

    my $dow = $dt->day_of_week;
    $dt->subtract(days => $dow-1);
    for my $i (1..$dow-1) {
        push @lines, "" if $i == 1;
        if ($args{show_prev_month_days} // 1) {
            $lines[-1] .= colored(sprintf("%2d ", $dt->day), "bright_black");
        } else {
            $lines[-1] .= "   ";
        }
        $dt->add(days => 1);
    }
    for (1..$dtl->day) {
        if ($dt->day_of_week == 1) {
            push @lines, "";
        }
        my $col = "white";
        if (($args{highlight_today}//1) && DateTime->compare($dt, $dt_today) == 0) {
            $col = "reverse";
        } else {
            for (@$hol) {
                if ($dt->day == $_->{day}) {
                    $col = "bright_red";
                }
            }
        }
        $lines[-1] .= colored(sprintf("%2d ", $dt->day), $col);
        $dt->add(days => 1);
    }
    if ($args{show_next_month_days} // 1) {
        $dow = $dt->day_of_week - 1; $dow = 7 if $dow == 0;
        for my $i ($dow+1..7) {
            $lines[-1] .= colored(sprintf("%2d ", $dt->day), "bright_black");
            $dt->add(days => 1);
        }
    }

    return [\@lines, $hol];
}

$SPEC{gen_calendar} = {
    v => 1.1,
    summary => 'Generate one or more monthly calendars in 3-column format',
    args => {
        months => {
            schema => ['int*', min=>1, max=>12, default=>1],
        },
        year => {
            schema => ['int*'],
            req => 1,
        },
        month => {
            summary => 'The first month',
            schema => ['int*'],
            description => <<'_',

Not required if months=12 (generate whole year from month 1 to 12).

_
        },