#!/usr/bin/perl

# rem2html
#
# A script to convert from the output of "remind -p" to Hyper-Text Markup
# Language (HTML), the text format used in WWW documents.  By default, it
# outputs a stand-alone file which can be fed directly into a web browser.
# The output uses nested <TABLE> blocks, so it will only work in a browser
# which supports tables (Netscape, MSIE, etc, NOT Lynx).
#
# This script works well on my computer (Linux 2.0.27) under Perl 5.003 and
# 5.004.  It should work fine on other unices but I have no idea whether
# it will run under VMS, OS/2, Windows, etc.
#
# [Note from David:  The REMIND license prohibits you from using REMIND
#  under Windows.]
#
# Rem2html puts "normal" CAL or MSG-type reminders in a <P></P> pair,
# and escapes any special HTML characters.
#
# If you want to put actual HTML code in the calendar (hyper-links, for
# example), use the "SPECIAL HTML" type.  For example:
#
# REM Wed SPECIAL HTML <P> Meeting at \
# <A HREF="http://www.linuxhq.com">Linux HQ</A> </P>
#
# This file is Copyright (C) 1997-8 by Don Schwarz <darkowl@mcs.net>
# and David F. Skoll
#
# v1.2-beta, Hal Burgiss <hal@foobox.net> 03/03/05
#
# Changelog:
#
# - Fixed some mark-up mishaps for calendars with multiple months.
# - Added provision for a default CSS stylesheet (remind.css), and various
#   related mark-up additions.
# - Added a 'nomini' option for eliminating the 'small calendar' thumbnails.
# - Added a 'title' option for HTML page title.
# - Added a 'print' option for nicer print look.
# - Added a 'months' option to control the size of the calendar.
# - Added a 'dtd' option to allow control of the document DTD.
# - Added some minor mark-up changes/improvements, eg xhtml compliant.
# - Added capability to grok remind data from within rem2html, looking for
#   cgi type output, with -x option.
#
#   A work in progress at this point.
#
#
########################################################################

use Getopt::Long;

@months = (January,February,March,April,May,June,July,August,September,October,November,December);
$def_width = '14%';

$DefaultImageDir = "%IMAGEBASE%";
$DefaultImageDir = "/images";
if ($DefaultImageDir =~ m@/$@) {
    chop $DefaultImageDir;
}

$rem2html_version = "1.2-beta";

&parse_options();

# Backgound color -- unfortunately, most Web browsers (as of 14 October 1999)
# do not correctly handle transparency in PNG images, so I had to make the
# moon image background white.
$Options{'bgcolor'} ||= "bgcolor=\"#FFFFFF\"";

# if (-t STDIN) {
#     print STDERR "(Rem2HTML: Input should not come from a terminal.)\n";
#     $Options{'help'} = 1;
# }

if ($Options{'help'}) {
  &show_usage();
} elsif ($Options{'version'}) {
  print "Rem2HTML Version $rem2html_version.\n";
} else {
  $successes = 0;
  $today = &today();
  $num = ($Options{'months'}) ? $Options{'months'} : 3;
  # get the data from remind here.
  $Options{'x'} && open STDIN, "$Options{'x'}  |" || die "<b>Unable to open todo file</b><br>";
 if (-t STDIN) {
     print STDERR "(Rem2HTML: Input should not come from a terminal.)\n";
     &show_usage();
 } else {
    while(1) {
     last if (!parse_input());
     $successes++;
     &output_header();
     &output_data();
     &output_footer();
    }
  print STDERR "Rem2HTML: Couldn't find any calendar data.\n" if (!$successes);
  unless ($Options{'tableonly'}) {
    print <<EndOfHTML;
 </body>
</html>
EndOfHTML
  }
}
exit(0);

sub show_usage {
  print STDERR <<EndOfUsage;
Rem2HTML: Produce a HTML calendar from the output of Remind.

Usage: rem2html [options]

Options:

--help, -h          Print this information
--version           Version information
--dtd,-d file       Use this file as the DTD specification.
-p file             Prepend the specified HTML file to the beginning of the
                    HTML output
-a file             Append the specified HTML file to the end of the output
-f[shted] font      Set font for small cal, hdr, title, cal entries,day numbers
-s[hted] size       Set size for header, title, calendar entries and/or day
                    numbers
--backurl url       Make the title on the previous month's small calendar entry
                    a hyperlink to <url>
--forwurl url       Same as --backurl, but with the next month's small calendar
--tableonly         Output the results as a <TABLE> block only, no <HTML>, etc.
--title name        Set HTML <title>
--nomini            Omit the small calendar thumbnails for previous/next months.
--months, -m num    Number of months for calendar to display.
--print             Minor changes to facilitate a more printable page.
--border,-b size    Set the border thickness of the table
--cellspace,-t size Set the line thickness of the table
--bgcolor,-g color  Set the background color for the day entries
-x cmd              Run the specified remind command from within rem2html.

EndOfUsage

}

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

sub parse_options {
  %Options = ();

  GetOptions (\%Options, "help|h",
                         "version",
                         "border|b=i",
                         "cellspace|t=i",
                         "dtd|d=s",
                         "backurl|bu:s", "forwurl|fu:s",
                         "tableonly|to",
                         "title|ti:s",
                         "nomini|nm",
                         "months|m:i",
                         "prologue|p=s",
                         "print",
                        "append|a=s",
                          "bgcolor|g=s",
                          "x:s",
                         "fs=s", "fh=s", "ft=s", "fe=s", "fd=s",
                                 "sh=i", "st=i", "se=i", "sd=i",
             );

   $Options{'border'} = "border=" . ($Options{'border'} || 1);
   $Options{'cellspace'} &&= "cellspacing=$Options{'cellspace'}";
   $Options{'bgcolor'} &&= "bgcolor=$Options{'bgcolor'}";
   $Options{'title'} = ($Options{'title'}) ? $Options{'title'} : "Calendar";
}

sub parse_input {
  local $where = 0;
  local $msg;
  local $type;
  local $day;
  my $title;
  @days = ();
  @shades = ();
  @moons = ();
  while (<>) {
    chomp($_);
    if (/rem2(html|ps) begin/) {
    } elsif (!$where) {
      next;
    } elsif ($where == 1) {
#      local ($month, $year); # need this later.
      ($month, $year, $month_length, $firstday, $mfirst) = split(" ");
      $caption = "$month, $year";
      for $i ( 1 .. $month_length) { push(@days, ""); }
    } elsif ($where == 2) {
      @DayNames = split(" ");
    } elsif ($where == 3) {
      @prevsc = split(" ");
    } elsif ($where == 4) {
      @nextsc = split(" ");
    } else {
      return 1 if /rem2(html|ps) end/;
      next unless m/^(\d*).(\d*).(\d*)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s*(.*)$/;
      $type = $4;
      $msg = $8;
      $day = $3;
      if ($type eq "HTML") {
	  $days[$day] .= "$msg ";
      } elsif ($type eq "MOON") {
	  my($phase, $text);
	  if ($msg =~ /^\s*(\d+)\s+\S+\s+\S+\s+(.*)$/) {
	      $phase = $1;
	      $text = $2;
	  } elsif ($msg =~ /^\s*(\d+)/) {
	      $phase = $1;
	      $text = "";
	  } else {
	      next;
	  }
	  next if ($phase > 3);
	  if ($phase == 0) {
	      $text = "<image src=\"$DefaultImageDir/newmoon.png\" alt=\"New Moon\"" .
		  "width=16 height=16> <font size=\"-2\">" . escape_html($text);
	  } elsif ($phase == 1) {
	      $text = "<image src=\"$DefaultImageDir/firstquarter.png\" alt=\"First Quarter\"" .
		  "width=16 height=16> <font size=\"-2\">" . escape_html($text);
	  } elsif ($phase == 2) {
	      $text = "<span class=\"moon\" >Full </span><image src=\"$DefaultImageDir/fullmoon.png\" alt=\"Full Moon\"" .
		  "width=16 height=16> <font size=\"-2\">\&nbsp;" . escape_html($text);
	  } else {
	      $text = "<image src=\"$DefaultImageDir/lastquarter.png\" alt=\"Last Quarter\"" .
		  "width=16 height=16> <font size=\"-2\">" . escape_html($text);
	  }
	  $moons[$day] = $text . "</font> ";
      } elsif ($type eq "SHADE") {
	  my($red, $green, $blue);
	  if ($msg =~ /^\s*(\d+)\s+(\d+)\s+(\d+)\s*$/) {
	      $red = $1;
	      $green = $2;
	      $blue = $3;
	  } elsif ($msg =~ /^\s*(\d+)\s*$/) {
	      $red = $1;
	      $green = $1;
	      $blue = $1;
	  } else {
	      next;
	  }
	  next if ($red > 255 || $green > 255 || $blue > 255);
       # shading done here
	  $shades[$day] = sprintf(" class=\"shaded\" bgcolor=\"#%02X%02X%02X\"",
				  $red, $green, $blue);
      } elsif ($type eq "*") {
       # this is the MSG from remind
       $title = $msg if ( $msg =~ /DETAIL:/ );
       $title =~ s/.*DETAIL: //;
       $msg =~ s/DETAIL: .*//;
       $title = "title=\"$title\"" if (length($title) > 0);
	  $msg = &escape_html($msg);
#	  $days[$day] .= "<p class=\"msg\"><a href='#' $title>$msg</a></p>";
#	  $days[$day] .= "<p class=\"msg\"><span $title>$msg</span></p>";
	  $days[$day] .= "<span class=\"msg\" $title>$msg</span><br/>";
      }
    }
    $where++;
  }
  if ($where) {
    return 1;
  }
  return 0;
}

sub output_header {
  local ($title, $dayheader);
  my $width="100%";
  my $class = ($Options{'print'}) ? 'class="printable"' : "";
if ($successes eq 1) {
   if (!$Options{'tableonly'}) {
       if ($Options{'dtd'}) {
           open(DTD, "< $Options{'dtd'}");
           print while ( <DTD> );
           close(DTD);
       }
     print <<EndOfHTML;
<html>
 <head><title>$Options{'title'}</title>
 <meta http-equiv="refresh" content="1200">
 <link rel="stylesheet" id="mainStyle" href="remind.css" type="text/css" />
  <script language="javascript">
  <!--
   function hotbox_on(name) {
    if (name == "nada") {
      return false;
    }
    oldcolor=document.getElementById(name).style.borderColor;
    document.getElementById(name).style.borderColor="pink" ;
    document.getElementById(name).style.borderWidth="3px" ;
    return true;
   }
   function hotbox_off(name) {
    if (name == "nada") {
      return false;
    }
    oldcolor="black";
    document.getElementById(name).style.borderWidth="1px" ;
    document.getElementById(name).style.borderColor=oldcolor ;
    return true;
   }
   // END -->
  </script>
 </head><body $class $Options{'bgcolor'} >

EndOfHTML
  }

  print <<EndOfHTML;
<!--
This output was produced by Rem2HTML $rem2html_version (written by
Don Schwarz <darkowl\@mcs.net>, updated and modified by Hal Burgiss
<hal\@foobox.net>), and Remind (written by David F. Skoll).
-->

EndOfHTML
}

if ($Options{'prologue'}) {
    open(PROLOGUE, "< $Options{'prologue'}");
    print while ( <PROLOGUE> );
    close(PROLOGUE);
  }

  $caption = &format_font($caption, $Options{'ft'}, $Options{'st'} || "+1");

  print <<EndOfHTML;
<div class="calendar" id="$month$year">
 <table class="caltable" $Options{'border'} $Options{'cellspace'} $Options{'bgcolor'} width=100%>
 <caption><strong>$caption</strong></caption>
 <tr>
EndOfHTML

  $mfirst || &print_day_header($DayNames[0]);

  for($i=1; $i<7; $i++) {
    &print_day_header($DayNames[$i]);
  }

  $mfirst && &print_day_header($DayNames[0]);
  print "</tr>\n";
}

sub output_footer {
  print "</table></div><p></p>\n\n";

  if ($Options{'append'}) {
    open(EPILOGUE, "< $Options{'append'}");
    print while ( <EPILOGUE> );
    close(EPILOGUE);
  }

  }
}

sub output_data {
  local ($endday, $prevday, $nextday, $week, $weekday);
  local ($element, $day, $msg, $fday, $id, $cell);
  $firstday -= $mfirst;
  if ($firstday < 0) { $firstday += 7; }
  $endday = $firstday + $month_length;
  $endweek = $endday + (6 - ($endday % 7));
  $endday %= 7;

  if ( $firstday > 1 ) {
    $prevday = 0;
    $nextday = 1;
  } elsif ($endday ? ($endday < 5) : !$firstday) {
    $prevday = $endweek - 1;
    $nextday = $endweek;
  } else {
    $prevday = 0;
    $nextday = $endweek;
  }

  for $week ( 0..5 ) {
    print " <tr>\n";
    for $weekday ( 0..6 ) {
      $element = ($week * 7) + ($weekday * 1);
      $day = $element - $firstday + 1;
      $cell = ($Options{'print'}) ? "print" :"cell";
      $msg = $days[$day];
      $id = $Options{'print'} ? "nada" : &fdate($day,$month,$year) ;
      $id = "today" if ("$today" eq "$id");
      $id = "nada" if ( "$id" ne "today" && (length($msg) eq 0) );
      $msg = $msg ? &format_font($msg, $Options{'fe'}, $Options{'se'})
                  : " <br> <br> <br> <br>";
      $fday = &format_font($day, $Options{'fd'}, $Options{'sd'} || -1);
      if ($day > 0 && $day <= $month_length) {
        # day numeral is here.
        print <<EndOfHTML;
  <td class="$cell" id="$id" onmousedown='hotbox_on("$id");' onmouseup='hotbox_off("$id");' height="120"  valign=top width=$def_width $shades[$day]>
  <div class="innercell">
   <div class="numeral">$moons[$day]$fday</div>
  </div><p></p>
  <div class="bottomcell">
   $msg
  </div></td>
EndOfHTML

      } elsif ($element == $prevday) {
        &small_calendar(@prevsc, 1, $Options{'backurl'});
      } elsif ($element == $nextday) {
        &small_calendar(@nextsc, 2, $Options{'forwurl'});
      } else {
        print "  <td width=$def_width><BR></TD>";
      }
    }
    print " </tr>\n";
    last if $day >= $month_length && $element >= $nextday;
  }
}

sub small_calendar {
  local ($scname, $scn, $which, $url) = @_;
  local ($scstart, $l, $week, $weekday, $tday);
  $scname = "<a href=\"$url\">$scname</a>", if $url;
  $scname = &format_font($scname, $Options{'fs'}, -2);

  if ($which == 1) {
    $scstart = $firstday - ($scn % 7);
    if ($scstart < 0) { $scstart += 7; }
  } else {
    $scstart = $firstday + ($month_length % 7);
    if ($scstart > 6) { $scstart -= 7; }
  }


if ($Options{'nomini'})  {
# Skip the 'small cal' stuff HB
  print "<td width=$def_width valign=TOP>
<table width=100%>
 <tr><td></td></tr>
</table>
  </td>";
 return 1;
}

  print <<EndOfHTML;
  <td width=$def_width valign=top>
<table width=100%>
 <caption><strong>$scname</strong></caption>
 <tr>
EndOfHTML

  $mfirst || &print_day_header(substr($DayNames[0], 0, 1), 1);

  for ($i=1; $i<7; $i++) {
    &print_day_header(substr($DayNames[$i], 0, 1), 1);
  }

  $mfirst && &print_day_header(substr($DayNames[0], 0, 1), 1);

  print "</tr>\n";

  for $week ( 0..5 ) {
    print " <tr>\n";
    for $weekday ( 0..6 ) {
      $tday = ($week * 7) + ($weekday * 1) - $scstart + 1;
      $tday = "", if $tday <= 0 || $tday > $scn;
      print "  <td width=$def_width><font size=-2>$tday</font></td>\n";
    }
    print " </tr>\n";
    last if $tday >= $scn;
  }

  print <<EndOfHTML;
</table>
  </td>
EndOfHTML

}

sub format_font {
  local ($text, $font, $size) = @_;

  if (!$text) {
    return "";
  } elsif ($font && $size) {
    return "<font face=$font size=$size>$text</font>";
  } elsif ($font) {
    return "<font face=$font>$text</font>";
  } elsif ($size) {
    return "<font size=$size>$text</font>";
  } else {
    return $text;
  }
}

sub print_day_header {
  local ($dheader, $small) = @_;

  if ($small) {
    $dheader = &format_font($dheader, $Options{'fs'}, -2);
  } else {
    $dheader = &format_font($dheader, $Options{'fh'}, $Options{'sh'});
  }

  print "  <th width=$def_width>$dheader</th>\n";
}

sub fdate($day,$month,$year) {
my $fday=$day;
my $fmon;

if ($day < 10 ) {
 $fday = "0$fday";
}

if ($month eq "January") {
 $fmon="01";
 } elsif ( $month eq "February" ) {
 $fmon="02";
 } elsif ( $month eq "March" ) {
 $fmon="03";
 } elsif ( $month eq "April" ) {
 $fmon="04";
 } elsif ( $month eq "May" ) {
 $fmon="05";
 } elsif ( $month eq "June" ) {
 $fmon="06";
 } elsif ( $month eq "July" ) {
 $fmon="07";
 } elsif ( $month eq "August" ) {
 $fmon="08";
 } elsif ( $month eq "September" ) {
 $fmon="09";
 } elsif ( $month eq "October" ) {
 $fmon="10";
 } elsif ( $month eq "November" ) {
 $fmon="11";
 } elsif ( $month eq "December" ) {
 $fmon="12";
}

 return ("$fday$fmon$year");

}

sub today() {
my($s,$t,$a,$mday,$mon,$year) = localtime(time);
$year+=1900;
$mon++;

if ( $mday < 10 ) {
 $mday = "0$mday";
}

if ( $mon < 10 ) {
 $mon = "0$mon";
}

return "$mday$mon$year";

}