path: root/.local/bin/rem2html

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0-only

use strict;
use warnings;

use Getopt::Long;
use JSON::MaybeXS;

my %Options;

my $rem2html_version = '2.1';

my($days, $shades, $moons, $classes, $Month, $Year, $Numdays, $Firstwkday, $Mondayfirst, $weeks,
    @Daynames, $Nextmon, $Nextlen, $Prevmon, $Prevlen);

my $TIDY_PROGNAME = $0;
$TIDY_PROGNAME =~ s|^.*/||;

# rem2html -- convert the output of "remind -pp" to HTML

=head1 NAME

rem2html - Convert the output of "remind -pp" to HTML

=head1 SYNOPSIS

    remind -pp ... | rem2html [options]

You can also use the old interchange format as below, but the -pp
version is preferred.

    remind -p ... | rem2html [options]

=head1 OPTIONS

=over 4

=item --help, -h

Print usage information

=item --version

Print version

=item --backurl I<url>

When producing the small calendar for the previous month, make the
month name a link to I<url>.

=item --forwurl I<url>

When producing the small calendar for the next month, make the
month name a link to I<url>.

=item --imgbase I<url>

When creating URLs for the stylesheet or external images, use I<url>
as the base URL.

=item --pngs

Normally, rem2html uses inline "data:" URLs for the moon phase images,
yielding a standalone HTML file.  The C<--pngs> option makes it use
external images named firstquarter.png, fullmoon.png, lastquarter.png
and newmoon.png, which are expected to live in C<--imgbase>.

=item --stylesheet I<url.css>

Use I<url.css> as the stylesheet.  If this option is used,
I<url.css> is interpreted relative to B<imgbase> I<unless> it starts
with a "/".

=item --nostyle

Produce basic HTML that does not use a CSS stylesheet.

=item --tableonly

Output results as a E<lt>tableE<gt> ... E<lt>/tableE<gt> sequence only
without any E<lt>htmlE<gt> or E<lt>bodyE<gt> tags.

=item --title I<title>

Use I<title> as the content between E<lt>titleE<gt> and E<lt>/titleE<gt>
tags.


=item --prologue I<html_text>

Insert I<html_text> right after the E<lt>bodyE<gt> tag.

=item --epilogue I<html_text>

Insert I<html_text> right before the E<lt>/bodyE<gt> tag.

=back

=head1 SPECIALS SUPPORTED

The rem2html back-end supports the following SPECIAL reminders:

=over

=item HTML

Add an HTML reminder to the calendar.  All HTML tags are available.

=item HTMLCLASS

Add a CSS class to the box representing the trigger date.  See
"HIGHLIGHTING TODAY" for an example

=item WEEK, MOON, SHARE, COLOR

The standard SPECIALs supported by all back-ends

=back

=head1 HIGHLIGHTING TODAY

Older versions of rem2html used to highlight today's date with a red outline.
The current version does not do that by default.  If you wish to highlight
today's date, add the following reminder to your reminders file:

    REM [realtoday()] SPECIAL HTMLCLASS rem-today

=head1 AUTHOR

rem2html was written by Dianne Skoll with much inspiration from an
earlier version by Don Schwarz.

=head1 HOME PAGE

L<https://dianne.skoll.ca/projects/remind/>

=head1 SEE ALSO

B<remind>, B<rem2ps>, B<rem2pdf>, B<tkremind>
=cut

sub usage
{
    my ($exit_status) = @_;
    if (!defined($exit_status)) {
	    $exit_status = 1;
    }
    print STDERR <<"EOM";
$TIDY_PROGNAME: Produce an HTML calendar from the output of "remind -pp"

Usage: remind -pp ... | rem2html [options]

Options:

--help, -h            Print usage information
--man                 Show man page (requires "perldoc")
--version             Print version
--backurl url         Make the title on the previous month's small calendar
                      entry a link to <url>
--forwurl url         Same as --backurl, but for the next month's small calendar
--imgbase url         Base URL of images and default stylesheet file
--pngs                Use external .PNG images for moon phases rater than
                      inline data: URLs
--stylesheet url.css  URL of CSS stylesheet.  If specified, imgbase is NOT
                      prepended to url.css
--nostyle             Produce basic HTML that does not use a CSS stylesheet
--tableonly           Output results as a <table> only, no <html>, <body>, etc.
--title string        What to put in <title>...</title> tags
--prologue html_text  Text to insert at the top of the body
--epilogue html_text  Text to insert at the end of the body
EOM
    exit($exit_status);
}

sub smoosh
{
        my ($first, $second) = @_;
        return $second unless defined ($first);
        return $second if $first eq '';
        return $second if ($second =~ m|^/|);  # Absolute path given for second

        # Squash multiple slashes
        $first =~ s|/+|/|g;

        # Special case
        return "/$second" if ($first eq '/');

        # Delete trailing slash
        $first =~ s|/$||;

        return "$first/$second";
}

sub parse_options
{
    local $SIG{__WARN__} = sub { print STDERR "$TIDY_PROGNAME: $_[0]\n"; };
    if (!GetOptions(\%Options, "help|h",
		    "man",
                    "pngs",
		    "version",
		    "stylesheet=s",
		    "nostyle",
		    "backurl=s",
		    "forwurl=s",
		    "title=s",
		    "prologue=s",
		    "epilogue=s",
		    "imgbase=s",
		    "tableonly")) {
	usage(1);
    }
    $Options{title} ||= 'HTML Calendar';

    my $stylesheet = $Options{stylesheet};
    if ($stylesheet) {
            $Options{stylesheet} = smoosh($Options{imgbase}, $stylesheet);
    }
}

sub start_output
{
    return if ($Options{tableonly});

    print("<!doctype html>\n");
    print("<html>\n<head>\n<title>" . $Options{title} . "</title>\n");
    print('<meta charset="utf-8">' . "\n");
    print('<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">' . "\n");
    if (!$Options{nostyle}) {
	if ($Options{stylesheet}) {
                print('<link rel="stylesheet" type="text/css" href="' .
                      $Options{stylesheet} . '">' . "\n");
	} else {
                print("<style>\n");
                print default_stylesheet();
                print("</style>\n");
        }
    }
    print("</head>\n<body>\n");
    if ($Options{prologue}) {
	print $Options{prologue} . "\n";
    }
}

sub end_output
{
    return if ($Options{tableonly});
    if ($Options{epilogue}) {
	print $Options{epilogue} . "\n";
    }
    print("</body>\n</html>\n");
}

sub parse_input
{
    undef $days;
    undef $shades;
    undef $moons;
    undef $classes;
    undef $weeks;

    my $found_data = 0;
    while(<STDIN>) {
	chomp;
	last if /^\# rem2ps2? begin$/;
    }

    my $line;
    # Month Year numdays firstday monday_first_flag
    $line = <STDIN>;
    return 0 unless $line;
    chomp($line);
    ($Month, $Year, $Numdays, $Firstwkday, $Mondayfirst) = split(' ', $line);

    $Month =~ s/_/ /g;
    # Day names
    $line = <STDIN>;
    return 0 unless $line;
    chomp($line);
    @Daynames = split(' ', $line);

    for (my $i=0; $i<7; $i++) {
            $Daynames[$i] =~ s/_/ /g;
    }

    # Prevmon prevlen
    $line = <STDIN>;
    return 0 unless $line;
    chomp($line);
    ($Prevmon, $Prevlen) = split(' ', $line);
    $Prevmon =~ s/_/ /g;

    # Nextmon nextlen
    $line = <STDIN>;
    return 0 unless $line;
    chomp($line);
    ($Nextmon, $Nextlen) = split(' ', $line);
    $Nextmon =~ s/_/ /g;

    $found_data = 1;
    my $class;
    if ($Options{nostyle}) {
	$class = '';
    } else {
	$class = ' class="rem-entry"';
    }
    while(<STDIN>) {
	chomp;
	last if /^\# rem2ps2? end$/;
	next if /^\#/;
	my ($y, $m, $d, $special, $tag, $duration, $time, $body);
	if (m/^(\d*).(\d*).(\d*)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s*(.*)$/) {
		($y, $m, $d, $special, $tag, $duration, $time, $body) =
		    ($1, $2, $3, $4, $5, $6, $7, $8);
	} elsif (/\{/) {
		my $obj = decode_json($_);
		next unless ($obj->{date} =~ /^(\d+)-(\d+)-(\d+)$/);
		$y = $1;
		$m = $2;
		$d = $3;
		$special = $obj->{passthru} || '*';
		$tag = $obj->{tags} || '*';
		$duration = $obj->{duration} || '*';
		$time = $obj->{time} || '*';
		$body = $obj->{body};
	} else {
		next;
	}
	my $d1 = $d;
	$d1 =~ s/^0+//;
	$special = uc($special);
	if ($special eq 'HTML') {
	    push(@{$days->[$d]}, $body);
	} elsif ($special eq 'HTMLCLASS') {
	    $classes->[$d] = $body;
	} elsif ($special eq 'WEEK') {
		$body =~ s/^\s+//;
		$body =~ s/\s+$//;
		$weeks->{$d1} = $body;
	} elsif ($special eq 'MOON') {
		if ($body =~ /(\S+)\s+(\S+)\s+(\S+)\s+(.*)$/) {
			my ($phase, $moonsize, $fontsize, $msg) = ($1, $2, $3, $4);
			$moons->[$d]->{'phase'} = $phase;
			$moons->[$d]->{'msg'} = $msg;
		} elsif ($body =~ /(\S+)/) {
			$moons->[$d]->{'phase'} = $1;
			$moons->[$d]->{'msg'} = '';
		}
	} elsif ($special eq 'SHADE') {
		if ($body =~ /(\d+)\s+(\d+)\s+(\d+)/) {
			$shades->[$d] = sprintf("#%02X%02X%02X",
						($1 % 256), ($2 % 256), ($3 % 256));
		} elsif ($body =~ /(\d+)/) {
			$shades->[$d] = sprintf("#%02X%02X%02X",
						($1 % 256), ($1 % 256), ($1 % 256));
		}
	} elsif ($special eq 'COLOR' || $special eq 'COLOUR') {
		if ($body =~ /(\d+)\s+(\d+)\s+(\d+)\s+(.*)$/) {
			my($r, $g, $b, $text) = ($1, $2, $3, $4);
			my $color = sprintf("style=\"color: #%02X%02X%02X;\"",
					    $r % 256, $g % 256, $b % 256);
			push(@{$days->[$d]}, "<p$class $color>" . escape_html($text) . '</p>');
		}
	} elsif ($special eq '*') {
	    push(@{$days->[$d]}, "<p$class>" . escape_html($body) . '</p>');
	}
    }
    return $found_data;
}

sub small_calendar
{
	my($month, $monlen, $url, $first_col) = @_;
	if ($Mondayfirst) {
		$first_col--;
		if ($first_col < 0) {
			$first_col = 6;
		}
	}

	if ($Options{nostyle}) {
	    print "<td width=\"14%\">\n";
	    print "<table border=\"0\">\n";
	    print "<caption>";
	} else {
	    print "<td class=\"rem-small-calendar\">\n";
	    print "<table class=\"rem-sc-table\">\n";
	    print "<caption class=\"rem-sc-caption\">";
	}
	print "<a href=\"$url\">" if ($url);
	print $month;
	print "</a>" if ($url);
	print "</caption>\n";

	my $class;
	if ($Options{nostyle}) {
	    print '<tr>';
	    $class = ' align="right"';
	} else {
	    print '<tr class="rem-sc-hdr-row">';
	    $class = ' class="rem-sc-hdr"';
	}
	if (!$Mondayfirst) {
		print "<th$class>" . substr($Daynames[0], 0, 1) . '</th>';
	}
	for (my $i=1; $i<7; $i++) {
		print "<th$class>" . substr($Daynames[$i], 0, 1) . '</th>';
	}
	if ($Mondayfirst) {
		print "<th$class>" . substr($Daynames[0], 0, 1) . '</th>';
	}
	print("</tr>\n");
	my $col = 0;
	for (; $col<$first_col; $col++) {
		if ($col == 0) {
			print("<tr>\n");
		}
		if ($Options{nostyle}) {
		    print("<td align=\"right\" width=\"14%\">&nbsp;</td>");
		} else {
		    print("<td class=\"rem-sc-empty-cell\">&nbsp;</td>");
		}
	}

	for (my $day=1; $day <= $monlen; $day++) {
		if ($col == 0) {
			print("<tr>\n");
		}
		$col++;
		if ($Options{nostyle}) {
		    print("<td align=\"right\" width=\"14%\">$day</td>");
		} else {
		    print("<td class=\"rem-sc-cell\">$day</td>");
		}
		if ($col == 7) {
			print("</tr>\n");
			$col = 0;
		}
	}
	if ($col) {
	    while ($col < 7) {
		if ($Options{nostyle}) {
		    print("<td align=\"right\" width=\"14%\">&nbsp;</td>");
		} else {
		    print("<td class=\"rem-sc-empty-cell\">&nbsp;</td>");
		}
		$col++;
	    }
	    print("</tr>\n");
	}
	print("</table>\n");
	print "</td>\n";
}

sub output_calendar
{
    # Which column is 1st of month in?
    my $first_col = $Firstwkday;
    if ($Mondayfirst) {
	$first_col--;
	if ($first_col < 0) {
	    $first_col = 6;
	}
    }

    # Last column
    my $last_col = ($first_col + $Numdays - 1) % 7;

    # Figure out how many rows
    my $number_of_rows = int(($first_col + $Numdays ) / 7 + 0.999);

    # Add a row for small calendars if necessary
    if ($first_col == 0 && $last_col == 6) {
            $number_of_rows++;
    }

    # Start the table
    my $class;
    if ($Options{nostyle}) {
	print '<table width="100%" border="1" cellspacing=\"0\"><caption>' .
	    $Month . ' ' . $Year . '</caption>' . "\n";
	print '<tr>';
	$class = ' width="14%"';
    } else {
	print '<table class="rem-cal"><caption class="rem-cal-caption">' .
	    $Month . ' ' . $Year . '</caption>' . "\n";
	print '<tr class="rem-cal-hdr-row">';
	$class = ' class="rem-cal-hdr"';
    }
    if (!$Mondayfirst) {
	print "<th$class>" . $Daynames[0] . '</th>';
    }
    for (my $i=1; $i<7; $i++) {
	print "<th$class>" . $Daynames[$i] . '</th>';
    }
    if ($Mondayfirst) {
	print "<th$class>" . $Daynames[0] . '</th>';
    }
    print "</tr>\n";

    # Start the calendar rows
    my $col = 0;
    if ($Options{nostyle}) {
	print "<tr>\n";
    } else {
	print "<tr class=\"rem-cal-row rem-cal-row-$number_of_rows-rows\">\n";
    }
    if ($first_col > 0) {
	small_calendar($Prevmon, $Prevlen, $Options{backurl},
		       ($Firstwkday - $Prevlen + 35) % 7);
	$col++;
    }

    if ($last_col == 6 && $first_col > 0) {
	small_calendar($Nextmon, $Nextlen, $Options{forwurl},
		       ($Firstwkday + $Numdays) % 7);
	$col++;
    }
    if ($Options{nostyle}) {
	$class = ' width="14%"';
    } else {
	$class = ' class="rem-empty rem-empty-$number_of_rows-rows"';
    }
    while ($col < $first_col) {
	print("<td$class>&nbsp;</td>\n");
	$col++;
    }

    for (my $day=1; $day<=$Numdays; $day++) {
        draw_day_cell($day, $number_of_rows);
	$col++;
	if ($col == 7) {
	    $col = 0;
	    print "</tr>\n";
	    if ($day < $Numdays) {
		if ($Options{nostyle}) {
		    print "<tr>\n";
		} else {
                    print "<tr class=\"rem-cal-row rem-cal-row-$number_of_rows-rows\">\n";
		}
	    }
	}
    }

    if ($col) {
	while ($col < 7) {
	    if ($col == 5) {
		if ($first_col == 0) {
		    small_calendar($Prevmon, $Prevlen, $Options{backurl},
				   ($Firstwkday - $Prevlen + 35) % 7);
		} else {
		    print("<td$class>&nbsp;</td>\n");
		}
	    } elsif ($col == 6) {
		small_calendar($Nextmon, $Nextlen, $Options{forwurl},
			       ($Firstwkday + $Numdays) % 7);
	    } else {
		print("<td$class>&nbsp;</td>\n");
	    }
	    $col++;
	}
	print "</tr>\n";
    }

    # Add a row for small calendars if they were not yet done!
    if ($first_col == 0 && $last_col == 6) {
	    if ($Options{nostyle}) {
		    print "<tr>\n";
	    } else {
                    print "<tr class=\"rem-cal-row rem-cal-row-$number_of_rows-rows\">\n";
	    }
	    small_calendar($Prevmon, $Prevlen, $Options{backurl},
			   ($Firstwkday - $Prevlen + 35) % 7);
	    for (my $i=0; $i<5; $i++) {
		print("<td$class>&nbsp;</td>\n");
	    }
	    small_calendar($Nextmon, $Nextlen, $Options{forwurl},
			   ($Firstwkday + $Numdays) % 7);
	    print("</tr>\n");
    }
    # End the table
    print "</table>\n";
}

sub draw_day_cell
{
    my($day, $number_of_rows) = @_;
    my $shade = $shades->[$day];
    my $week = '';
    if (exists($weeks->{$day})) {
	    $week = ' ' . $weeks->{$day};
    }
    my $class;
    if ($Options{nostyle}) {
	$class = $classes->[$day] || '';
    } else {
	$class = $classes->[$day] || "rem-cell rem-cell-$number_of_rows-rows";
    }
    if ($shade) {
	    $shade = " style=\"background: $shade;\"";
    } else {
	    $shade = "";
    }
    if ($class ne '') {
	print "<td class=\"$class\"$shade>\n";
    } else {
	print "<td valign=\"top\" $shade>\n";
    }
    if ($moons->[$day]) {
	    my $phase = $moons->[$day]->{'phase'};
	    my $msg = $moons->[$day]->{'msg'};
	    $msg ||= '';
	    if ($msg ne '') {
		    $msg = '&nbsp;' . escape_html($msg);
	    }
	    my $img;
	    my $alt;
	    my $title;
	    if ($phase == 0) {
                    if ($Options{pngs}) {
                            $img = smoosh($Options{imgbase}, 'newmoon.png');
                    } else {
                            $img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAGQAAABkABchkaRQAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAAC6SURBVDiNpdNNbsIwFATgL0HKolchHKBX6yFaBOEyoPYUabvOIVKJRaCL2JX5TRNGGvnJ8ozGz89cYoElPvET+BX2yivn/1Bggw5HHMKa1h2qcPZC/JEIhvh+brIZIY6sorhMYo9hh3KGFzzfa84NZNjDt9OG/ZcH1BlaPE1IAG0+URhxzNGESKPFaHJs9Q0Ziww7HnvGeXSrJhis0jiFfjwnj3I0WRv+TKtr4hQl3lDrZ6QN9Wt654hfWfGDmBpUwDkAAAAASUVORK5CYII=';
                    }
		    $title = 'New Moon';
		    $alt = 'new';
	    } elsif ($phase == 1) {
                    if ($Options{pngs}) {
                            $img = smoosh($Options{imgbase}, 'firstquarter.png');
                    } else {
                            $img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAGQAAABkABchkaRQAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAADfSURBVDiNndM9TsNAFATgzy5yjZSAE85JBygETgENUPF3iBCitHAFQkcIhZ/Ryn9gRlrZmp2Z3ef3TBOHOMULPrDBMrhpi/4HI5xjix2+4nmJRbx/Yh7ahvkpRPVV4QDXwT3UQy46zGkAZDgK/iytefvHgCrkJsqZUH6cLnNbABSxd5Jhhf1IbkMXv8Qux7hH1Ic1xvk/jBWy6gavumvtwx7ectwZXkKh7MA95XgObeOtpI2U4zl0kGbpxgiPvwQUcXLrKFchc82f6Ur0PK49azOnmOI4TBu84zm4SV38DeIVYkrYJyNbAAAAAElFTkSuQmCC';
                    }
		    $title = 'First Quarter';
		    $alt = '1st';
	    } elsif ($phase == 2) {
                    if ($Options{pngs}) {
                            $img = smoosh($Options{imgbase}, 'fullmoon.png');
                    } else {
                            $img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAGQAAABkABchkaRQAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAADlSURBVDiNrdNBUsJAEAXQlyw4hq4hwWPqTixET6ELkZ16CcAq7oFLqXExjaYgQVNlV/Viev7/6XT/4TjGuME7PiLXUatb8N8xwB12SFjiIXIZtU/MAntEfgvQE4YtHxhiHpjXQ5H7uLhEcaLLAleBvd0Xx9Ha/BdyU+Q5OBV5OKmj7a4YBWdSyNPe4aKHAHkzqcQZNj3JgnNexqE8heyIAulffuFF3kTfIVbBVeu/xoXGGsn2TLJJ/mqkafNiINszySYZdbS90GHlvcgsWktY4TFy7ecxTdvIzahxHQLbyFXUqkPwF2ASRNYgB/PXAAAAAElFTkSuQmCC';
                    }
		    $alt = 'full';
		    $title = 'Full Moon';
	    } else {
                    if ($Options{pngs}) {
                            $img = smoosh($Options{imgbase}, 'lastquarter.png');
                    } else {
                            $img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAAAGQAAABkABchkaRQAAABl0RVh0U29mdHdhcmUAd3d3Lmlua3NjYXBlLm9yZ5vuPBoAAADmSURBVDiNndMxTsNAEIXhzy5yCyQ6FAgcE7oQheQWUAAl5BIkREoZrgB0GFNkHBl7bURGsryaee/3jHeXdpxjghU+8InXyI0S+n0MMEeBEi+4jfV3vAvMQtsyL0J0j2GtViaeRRMyj8IlsgY8BSijE2Kur/hy09wHKMJrEolhwtwHKDHOsI4OLnoAXfl1jiNsOkR9keE4P8D4q4scbzg5xIxtjie709f1E7siC+9+Gx/8fxvPKtEsklcJSBdgWhcN8ByFR5z+AWgd5QpyE+OUWOJO+zJNU+Z6jHAdgHe7K73CuD5zFT9nCmRDIssCaAAAAABJRU5ErkJggg==';
                    }
		    $alt = 'last';
		    $title = 'Last Quarter';
	    }
	    if ($Options{nostyle}) {
		print("<div style=\"float: left\"><img border=\"0\" width=\"16\" height=\"16\" alt=\"$alt\" title=\"$title\" src=\"$img\">$msg</div>");
	    } else {
		print("<div class=\"rem-moon\"><img width=\"16\" height=\"16\" alt=\"$alt\" title=\"$title\" src=\"$img\">$msg</div>");
	    }
    }

    if ($Options{nostyle}) {
	print "<div style=\"float: right\">$day$week</div>\n";
	print "<p>&nbsp;</p>\n";
    } else {
	print "<div class=\"rem-daynumber\">$day$week</div>\n";
    }
    if ($days->[$day]) {
	    print(join("\n", @{$days->[$day]}));
    }

    print "</td>\n";
}

sub escape_html
{
    my($in) = @_;
    $in =~ s/\&/\&amp;/g;
    $in =~ s/\</\&lt;/g;
    $in =~ s/\>/\&gt;/g;
    return $in;
}

parse_options();
if ($Options{help}) {
    usage(0);
    exit(0);
} elsif ($Options{man}) {
    system("perldoc $0");
    exit(0);
} elsif ($Options{version}) {
    print "rem2html version $rem2html_version.\n";
    exit(0);
}

if (-t STDIN) { ## no critic
    print STDERR "$TIDY_PROGNAME: Input should not come from a terminal.\n\n";
    usage(1);
}

my $found_something = 0;
while(1) {
    last if (!parse_input());
    start_output() unless $found_something;
    $found_something = 1;
    output_calendar();
}
if ($found_something) {
    end_output();
    exit(0);
} else {
    print STDERR "$TIDY_PROGNAME: Could not find any calendar data on STDIN.\n";
    exit(1);
}

sub default_stylesheet
{
        return <<'EOF';
table.rem-cal {
  font-family: helvetica, arial, sans-serif;
  font-size: 12pt;
}

table.rem-sc-table {
  font-family: helvetica, arial, sans-serif;
  font-size: 10pt;
  width: 95%;
  float: left;
}

caption.rem-cal-caption {
  font-size: 14pt;
  font-weight: bold;
}

th.rem-cal-hdr {
  width: 14%;
  border-style: solid;
  border-width: 1px;
  vertical-align: top;
}
td.rem-empty, td.rem-cell, td.rem-small-calendar {
  width: 14%;
  height: 7em;
  border-style: solid;
  border-width: 1px;
  vertical-align: top;
}
td.rem-today {
  width: 14%;
  height: 7em;
  border-style: solid;
  border-width: 2px;
  border-color: #EE3333;
  vertical-align: top;
}

table.rem-cal {
  width: 100%;
  border-collapse: collapse;
}

div.rem-daynumber {
  float: right;
  text-align: right;
  vertical-align: top;
  font-size: 14pt;
}

p.rem-entry {
    clear: both;
}

div.rem-moon {
  float: left;
  text-align: left;
  vertical-align: top;
}

th.rem-sc-hdr {
  text-align: right;
}

td.rem-sc-empty-cell, td.rem-sc-cell {
  text-align: right;
  width: 14%;
}

caption.rem-sc-caption {
  font-size: 12pt;
}
EOF
}