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   1 #! /usr/bin/perl
   2 # Copyright (c) 2006, 2007 Manoj Srivastava <srivasta@debian.org>
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18 require 5.002;
  19 package IkiWiki::Plugin::calendar;
  20
  21 use warnings;
  22 use strict;
  23 use IkiWiki 2.00;
  24 use Time::Local;
  25 use POSIX;
  26
  27 my %cache;
  28 my %linkcache;
  29 my $time=time;
  30 my @now=localtime($time);
  31
  32 sub import { #{{{
  33         hook(type => "needsbuild", id => "version", call => \&needsbuild);
  34         hook(type => "preprocess", id => "calendar", call => \&preprocess);
  35 } #}}}
  36
  37 sub needsbuild (@) { #{{{
  38         my $needsbuild=shift;
  39         foreach my $page (keys %pagestate) {
  40                 if (exists $pagestate{$page}{calendar}{nextchange}) {
  41                         if ($pagestate{$page}{calendar}{nextchange} >= $time) {
  42                                 # force a rebuild so the calendar shows
  43                                 # the current day
  44                                 push @$needsbuild, $pagesources{$page};
  45                         }
  46                         if (grep { $_ eq $pagesources{$page} } @$needsbuild) {
  47                                 # remove state, will be re-added if
  48                                 # the calendar is still there during the
  49                                 # rebuild
  50                                 delete $pagestate{$page}{calendar};
  51                         }
  52                 }
  53         }
  54 } # }}}
  55
  56 sub is_leap_year (@) { #{{{
  57         my %params=@_;
  58         return ($params{year} % 4 == 0 && (($params{year} % 100 != 0) || $params{year} % 400 == 0));
  59 } #}}}
  60
  61 sub month_days { #{{{
  62         my %params=@_;
  63         my $days_in_month = (31,28,31,30,31,30,31,31,30,31,30,31)[$params{month}-1];
  64         if ($params{month} == 2 && is_leap_year(%params)) {
  65                 $days_in_month++;
  66         }
  67         return $days_in_month;
  68 } #}}}
  69
  70 sub format_month (@) { #{{{
  71         my %params=@_;
  72
  73         my $pagespec = $params{pages};
  74         my $year     = $params{year};
  75         my $month    = $params{month};
  76         my $pmonth   = $params{pmonth};
  77         my $nmonth   = $params{nmonth};
  78         my $pyear    = $params{pyear};
  79         my $nyear    = $params{nyear};
  80
  81         my @list;
  82         my $calendar="\n";
  83
  84         # When did this month start?
  85         my @monthstart = localtime(timelocal(0,0,0,1,$month-1,$year-1900));
  86
  87         my $future_dom = 0;
  88         my $today      = 0;
  89         if ($year == $now[5]+1900 && $month == $now[4]+1) {
  90                 $future_dom = $now[3]+1;
  91                 $today      = $now[3];
  92         }
  93
  94         # Find out month names for this, next, and previous months
  95         my $monthname=POSIX::strftime("%B", @monthstart);
  96         my $pmonthname=POSIX::strftime("%B", localtime(timelocal(0,0,0,1,$pmonth-1,$pyear-1900)));
  97         my $nmonthname=POSIX::strftime("%B", localtime(timelocal(0,0,0,1,$nmonth-1,$nyear-1900)));
  98
  99         my $archivebase = 'archives';
 100         $archivebase = $config{archivebase} if defined $config{archivebase};
 101         $archivebase = $params{archivebase} if defined $params{archivebase};
 102
 103         # Calculate URL's for monthly archives.
 104         my ($url, $purl, $nurl)=("$monthname",'','');
 105         if (exists $cache{$pagespec}{"$year/$month"}) {
 106                 $url = htmllink($params{page}, $params{destpage},
 107                         "$archivebase/$year/".sprintf("%02d", $month),
 108                         linktext => " $monthname ");
 109         }
 110         add_depends($params{page}, "$archivebase/$year/".sprintf("%02d", $month));
 111         if (exists $cache{$pagespec}{"$pyear/$pmonth"}) {
 112                 $purl = htmllink($params{page}, $params{destpage},
 113                         "$archivebase/$pyear/" . sprintf("%02d", $pmonth),
 114                         linktext => " $pmonthname ");
 115         }
 116         add_depends($params{page}, "$archivebase/$pyear/".sprintf("%02d", $pmonth));
 117         if (exists $cache{$pagespec}{"$nyear/$nmonth"}) {
 118                 $nurl = htmllink($params{page}, $params{destpage},
 119                         "$archivebase/$nyear/" . sprintf("%02d", $nmonth),
 120                         linktext => " $nmonthname ");
 121         }
 122         add_depends($params{page}, "$archivebase/$nyear/".sprintf("%02d", $nmonth));
 123
 124         # Start producing the month calendar
 125         $calendar=<<EOF;
 126 <table class="month-calendar">
 127         <caption class="month-calendar-head">
 128         $purl
 129         $url
 130         $nurl
 131         </caption>
 132         <tr>
 133 EOF
 134
 135         # Suppose we want to start the week with day $week_start_day
 136         # If $monthstart[6] == 1
 137         my $week_start_day = $params{week_start_day};
 138
 139         my $start_day = 1 + (7 - $monthstart[6] + $week_start_day) % 7;
 140         my %downame;
 141         my %dowabbr;
 142         for my $dow ($week_start_day..$week_start_day+6) {
 143                 my @day=localtime(timelocal(0,0,0,$start_day++,$month-1,$year-1900));
 144                 my $downame = POSIX::strftime("%A", @day);
 145                 my $dowabbr = POSIX::strftime("%a", @day);
 146                 $downame{$dow % 7}=$downame;
 147                 $dowabbr{$dow % 7}=$dowabbr;
 148                 $calendar.= qq{\t\t<th class="month-calendar-day-head $downame">$dowabbr</th>\n};
 149         }
 150
 151         $calendar.=<<EOF;
 152         </tr>
 153 EOF
 154
 155         my $wday;
 156         # we start with a week_start_day, and skip until we get to the first
 157         for ($wday=$week_start_day; $wday != $monthstart[6]; $wday++, $wday %= 7) {
 158                 $calendar.=qq{\t<tr>\n} if $wday == $week_start_day;
 159                 $calendar.=qq{\t\t<td class="month-calendar-day-noday $downame{$wday}">&nbsp;</td>\n};
 160         }
 161
 162         # At this point, either the first is a week_start_day, in which case
 163         # nothing has been printed, or else we are in the middle of a row.
 164         for (my $day = 1; $day <= month_days(year => $year, month => $month);
 165              $day++, $wday++, $wday %= 7) {
 166                 # At tihs point, on a week_start_day, we close out a row,
 167                 # and start a new one -- unless it is week_start_day on the
 168                 # first, where we do not close a row -- since none was started.
 169                 if ($wday == $week_start_day) {
 170                         $calendar.=qq{\t</tr>\n} unless $day == 1;
 171                         $calendar.=qq{\t<tr>\n};
 172                 }
 173
 174                 my $tag;
 175                 my $mtag = sprintf("%02d", $month);
 176                 if (defined $cache{$pagespec}{"$year/$mtag/$day"}) {
 177                         if ($day == $today) {
 178                                 $tag='month-calendar-day-this-day';
 179                         }
 180                         else {
 181                                 $tag='month-calendar-day-link';
 182                         }
 183                         $calendar.=qq{\t\t<td class="$tag $downame{$wday}">};
 184                         $calendar.=htmllink($params{page}, $params{destpage},
 185                                             pagename($linkcache{"$year/$mtag/$day"}),
 186                                             "linktext" => "$day");
 187                         push @list, pagename($linkcache{"$year/$mtag/$day"});
 188                         $calendar.=qq{</td>\n};
 189                 }
 190                 else {
 191                         if ($day == $today) {
 192                                 $tag='month-calendar-day-this-day';
 193                         }
 194                         elsif ($day == $future_dom) {
 195                                 $tag='month-calendar-day-future';
 196                         }
 197                         else {
 198                                 $tag='month-calendar-day-nolink';
 199                         }
 200                         $calendar.=qq{\t\t<td class="$tag $downame{$wday}">$day</td>\n};
 201                 }
 202         }
 203
 204         # finish off the week
 205         for (; $wday != $week_start_day; $wday++, $wday %= 7) {
 206                 $calendar.=qq{\t\t<td class="month-calendar-day-noday $downame{$wday}">&nbsp;</td>\n};
 207         }
 208         $calendar.=<<EOF;
 209         </tr>
 210 </table>
 211 EOF
 212
 213         # Add dependencies to update the calendar whenever pages
 214         # matching the pagespec are added or removed.
 215         add_depends($params{page}, $params{pages});
 216         # Explicitly add all currently linked pages as dependencies, so
 217         # that if they are removed, the calendar will be sure to be updated.
 218         add_depends($params{page}, join(" or ", @list));
 219
 220         return $calendar;
 221 } #}}}
 222
 223 sub format_year (@) { #{{{
 224         my %params=@_;
 225
 226         my $pagespec = $params{pages};
 227         my $year     = $params{year};
 228         my $month    = $params{month};
 229         my $pmonth   = $params{pmonth};
 230         my $nmonth   = $params{nmonth};
 231         my $pyear    = $params{pyear};
 232         my $nyear    = $params{nyear};
 233
 234         my $calendar="\n";
 235
 236         my $future_month = 0;
 237         $future_month = $now[4]+1 if ($year == $now[5]+1900);
 238
 239         my $archivebase = 'archives';
 240         $archivebase = $config{archivebase} if defined $config{archivebase};
 241         $archivebase = $params{archivebase} if defined $params{archivebase};
 242
 243         # calculate URL's for previous and next years
 244         my ($url, $purl, $nurl)=("$year",'','');
 245         if (exists $cache{$pagespec}{"$year"}) {
 246                 $url = htmllink($params{page}, $params{destpage},
 247                         "$archivebase/$year",
 248                         linktext => "$year");
 249         }
 250         add_depends($params{page}, "$archivebase/$year");
 251         if (exists $cache{$pagespec}{"$pyear"}) {
 252                 $purl = htmllink($params{page}, $params{destpage},
 253                         "$archivebase/$pyear",
 254                         linktext => "\&larr;");
 255         }
 256         add_depends($params{page}, "$archivebase/$pyear");
 257         if (exists $cache{$pagespec}{"$nyear"}) {
 258                 $nurl = htmllink($params{page}, $params{destpage},
 259                         "$archivebase/$nyear",
 260                         linktext => "\&rarr;");
 261         }
 262         add_depends($params{page}, "$archivebase/$nyear");
 263
 264         # Start producing the year calendar
 265         $calendar=<<EOF;
 266 <table class="year-calendar">
 267         <caption class="year-calendar-head">
 268         $purl
 269         $url
 270         $nurl
 271         </caption>
 272         <tr>
 273                 <th class="year-calendar-subhead" colspan="$params{months_per_row}">Months</th>
 274         </tr>
 275 EOF
 276
 277         for ($month = 1; $month <= 12; $month++) {
 278                 my @day=localtime(timelocal(0,0,0,15,$month-1,$year-1900));
 279                 my $murl;
 280                 my $monthname = POSIX::strftime("%B", @day);
 281                 my $monthabbr = POSIX::strftime("%b", @day);
 282                 $calendar.=qq{\t<tr>\n}  if ($month % $params{months_per_row} == 1);
 283                 my $tag;
 284                 my $mtag=sprintf("%02d", $month);
 285                 if ($month == $params{month}) {
 286                         if ($cache{$pagespec}{"$year/$mtag"}) {
 287                                 $tag = 'this_month_link';
 288                         }
 289                         else {
 290                                 $tag = 'this_month_nolink';
 291                         }
 292                 }
 293                 elsif ($cache{$pagespec}{"$year/$mtag"}) {
 294                         $tag = 'month_link';
 295                 }
 296                 elsif ($future_month && $month >= $future_month) {
 297                         $tag = 'month_future';
 298                 }
 299                 else {
 300                         $tag = 'month_nolink';
 301                 }
 302
 303                 if ($cache{$pagespec}{"$year/$mtag"}) {
 304                         $murl = htmllink($params{page}, $params{destpage},
 305                                 "$archivebase/$year/$mtag",
 306                                 linktext => "$monthabbr");
 307                         $calendar.=qq{\t<td class="$tag">};
 308                         $calendar.=$murl;
 309                         $calendar.=qq{\t</td>\n};
 310                 }
 311                 else {
 312                         $calendar.=qq{\t<td class="$tag">$monthabbr</td>\n};
 313                 }
 314                 add_depends($params{page}, "$archivebase/$year/$mtag");
 315
 316                 $calendar.=qq{\t</tr>\n} if ($month % $params{months_per_row} == 0);
 317         }
 318
 319         $calendar.=<<EOF;
 320 </table>
 321 EOF
 322
 323         return $calendar;
 324 } #}}}
 325
 326 sub preprocess (@) { #{{{
 327         my %params=@_;
 328         $params{pages} = "*"            unless defined $params{pages};
 329         $params{type}  = "month"        unless defined $params{type};
 330         $params{month} = sprintf("%02d", $params{month}) if defined  $params{month};
 331         $params{week_start_day} = 0     unless defined $params{week_start_day};
 332         $params{months_per_row} = 3     unless defined $params{months_per_row};
 333
 334         if (! defined $params{year} || ! defined $params{month}) {
 335                 # Record that the calendar next changes at midnight.
 336                 $pagestate{$params{destpage}}{calendar}{nextchange}=($time
 337                         + (60 - $now[0])                # seconds
 338                         + (59 - $now[1]) * 60           # minutes
 339                         + (23 - $now[2]) * 60 * 60      # hours
 340                 );
 341
 342                 $params{year}  = 1900 + $now[5] unless defined $params{year};
 343                 $params{month} = 1    + $now[4] unless defined $params{month};
 344         }
 345         else {
 346                 delete $pagestate{$params{destpage}}{calendar};
 347         }
 348
 349         # Calculate month names for next month, and previous months
 350         my $pmonth = $params{month} - 1;
 351         my $nmonth = $params{month} + 1;
 352         my $pyear  = $params{year}  - 1;
 353         my $nyear  = $params{year}  + 1;
 354
 355         # Adjust for January and December
 356         if ($params{month} == 1) {
 357                 $pmonth = 12;
 358                 $pyear--;
 359         }
 360         if ($params{month} == 12) {
 361                 $nmonth = 1;
 362                 $nyear++;
 363         }
 364
 365         $params{pmonth}=$pmonth;
 366         $params{nmonth}=$nmonth;
 367         $params{pyear} =$pyear;
 368         $params{nyear} =$nyear;
 369
 370         my $calendar="\n";
 371         my $pagespec=$params{pages};
 372         my $page =$params{page};
 373
 374         if (! defined $cache{$pagespec}) {
 375                 foreach my $p (keys %pagesources) {
 376                         next unless pagespec_match($p, $pagespec);
 377                         my $mtime = $IkiWiki::pagectime{$p};
 378                         my $src   = $pagesources{$p};
 379                         my @date  = localtime($mtime);
 380                         my $mday  = $date[3];
 381                         my $month = $date[4] + 1;
 382                         my $year  = $date[5] + 1900;
 383                         my $mtag  = sprintf("%02d", $month);
 384
 385                         # Only one posting per day is being linked to.
 386                         $linkcache{"$year/$mtag/$mday"} = "$src";
 387                         $cache{$pagespec}{"$year"}++;
 388                         $cache{$pagespec}{"$year/$mtag"}++;
 389                         $cache{$pagespec}{"$year/$mtag/$mday"}++;
 390                 }
 391         }
 392
 393         if ($params{type} =~ /month/i) {
 394                 $calendar=format_month(%params);
 395         }
 396         elsif ($params{type} =~ /year/i) {
 397                 $calendar=format_year(%params);
 398         }
 399
 400         return "\n<div><div class=\"calendar\">$calendar</div></div>\n";
 401 } #}}
 402
 403 1