IkiWiki/Plugin/calendar.pm

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  17
  18 require 5.002;
  19 package IkiWiki::Plugin::calendar;
  20
  21 use warnings;
  22 use strict;
  23 use IkiWiki 3.00;
  24 use Time::Local;
  25
  26 my $time=time;
  27 my @now=localtime($time);
  28 my %changed;
  29
  30 sub import {
  31         hook(type => "checkconfig", id => "calendar", call => \&checkconfig);
  32         hook(type => "getsetup", id => "calendar", call => \&getsetup);
  33         hook(type => "needsbuild", id => "calendar", call => \&needsbuild);
  34         hook(type => "preprocess", id => "calendar", call => \&preprocess);
  35         hook(type => "scan", id => "calendar", call => \&scan);
  36         hook(type => "build_affected", id => "calendar", call => \&build_affected);
  37
  38         IkiWiki::loadplugin("transient");
  39 }
  40
  41 sub getsetup () {
  42         return
  43                 plugin => {
  44                         safe => 1,
  45                         rebuild => undef,
  46                         section => "widget",
  47                 },
  48                 archivebase => {
  49                         type => "string",
  50                         example => "archives",
  51                         description => "base of the archives hierarchy",
  52                         safe => 1,
  53                         rebuild => 1,
  54                 },
  55                 archive_pagespec => {
  56                         type => "pagespec",
  57                         example => "page(posts/*) and !*/Discussion",
  58                         description => "PageSpec of pages to include in the archives, if option `calendar_autocreate` is true.",
  59                         link => 'ikiwiki/PageSpec',
  60                         safe => 1,
  61                         rebuild => 0,
  62                 },
  63                 calendar_autocreate => {
  64                         type => "boolean",
  65                         example => 1,
  66                         description => "autocreate new calendar pages?",
  67                         safe => 1,
  68                         rebuild => undef,
  69                 },
  70                 calendar_fill_gaps => {
  71                         type => "boolean",
  72                         example => 1,
  73                         default => 1,
  74                         description => "if set, when building calendar pages, also build pages of year and month when no pages were published (building empty calendars).",
  75                         safe => 1,
  76                         rebuild => 0,
  77                 },
  78 }
  79
  80 sub checkconfig () {
  81         if (! defined $config{calendar_autocreate}) {
  82                 $config{calendar_autocreate} = defined $config{archivebase};
  83         }
  84         if (! defined $config{archive_pagespec}) {
  85                 $config{archive_pagespec} = '*';
  86         }
  87         if (! defined $config{archivebase}) {
  88                 $config{archivebase} = 'archives';
  89         }
  90         if (! defined $config{calendar_fill_gaps}) {
  91                 $config{calendar_fill_gaps} = 1;
  92         }
  93 }
  94
  95 sub is_leap_year (@) {
  96         my %params=@_;
  97         return ($params{year} % 4 == 0 && (($params{year} % 100 != 0) || $params{year} % 400 == 0));
  98 }
  99
 100 sub month_days {
 101         my %params=@_;
 102         my $days_in_month = (31,28,31,30,31,30,31,31,30,31,30,31)[$params{month}-1];
 103         if ($params{month} == 2 && is_leap_year(%params)) {
 104                 $days_in_month++;
 105         }
 106         return $days_in_month;
 107 }
 108
 109 sub build_affected {
 110         my %affected;
 111         my ($ayear, $amonth, $valid);
 112
 113         foreach my $year (keys %changed) {
 114                 ($ayear, $valid) = nextyear($year, $config{archivebase});
 115                 $affected{calendarlink($ayear)} = sprintf(gettext("building calendar for %s, its previous or next year has changed"), $ayear) if ($valid);
 116                 ($ayear, $valid) = previousyear($year, $config{archivebase});
 117                 $affected{calendarlink($ayear)} = sprintf(gettext("building calendar for %s, its previous or next year has changed"), $ayear) if ($valid);
 118                 foreach my $month (keys %{$changed{$year}}) {
 119                         ($ayear, $amonth, $valid) = nextmonth($year, $month, $config{archivebase});
 120                         $affected{calendarlink($ayear, sprintf("%02d", $amonth))} = sprintf(gettext("building calendar for %s/%s, its previous or next month has changed"), $amonth, $ayear) if ($valid);
 121                         ($ayear, $amonth, $valid) = previousmonth($year, $month, $config{archivebase});
 122                         $affected{calendarlink($ayear, sprintf("%02d", $amonth))} = sprintf(gettext("building calendar for %s/%s, its previous or next month has changed"), $amonth, $ayear) if ($valid);
 123                 }
 124         }
 125
 126         return %affected;
 127 }
 128
 129 sub autocreate {
 130         my ($page, $pagefile, $year, $month) = @_;
 131         my $message=sprintf(gettext("creating calendar page %s"), $page);
 132         debug($message);
 133
 134         my $template;
 135         if (defined $month) {
 136                 $template=template("calendarmonth.tmpl");
 137         } else {
 138                 $template=template("calendaryear.tmpl");
 139         }
 140         $template->param(year => $year);
 141         $template->param(month => $month) if defined $month;
 142         $template->param(pagespec => $config{archive_pagespec});
 143
 144         my $dir = $IkiWiki::Plugin::transient::transientdir;
 145
 146         writefile($pagefile, $dir, $template->output);
 147 }
 148
 149 sub calendarlink($;$) {
 150         my ($year, $month) = @_;
 151         if (defined $month) {
 152                 return $config{archivebase} . "/" . $year . "/" . $month;
 153         } else {
 154                 return $config{archivebase} . "/" . $year;
 155         }
 156 }
 157
 158 sub gencalendarmonth{
 159         my $year = shift;
 160         my $month = sprintf("%02d", shift);
 161
 162         my $page = calendarlink($year, $month);
 163         my $pagefile = newpagefile($page, $config{default_pageext});
 164         add_autofile(
 165                 $pagefile, "calendar",
 166                 sub {return autocreate($page, $pagefile, $year, $month);}
 167         );
 168 }
 169
 170 sub gencalendaryear {
 171         my $year = shift;
 172         my %params = @_;
 173
 174         # Building year page
 175         my $page = calendarlink($year);
 176         my $pagefile = newpagefile($page, $config{default_pageext});
 177         add_autofile(
 178                 $pagefile, "calendar",
 179                 sub {return autocreate($page, $pagefile, $year);}
 180         );
 181
 182         if (not exists $wikistate{calendar}{minyear}) {
 183                 $wikistate{calendar}{minyear} = $year;
 184         }
 185         if (not exists $wikistate{calendar}{maxyear}) {
 186                 $wikistate{calendar}{maxyear} = $year;
 187         }
 188
 189         if ($config{calendar_fill_gaps}) {
 190                 # Building month pages
 191                 foreach my $month (1 .. 12) {
 192                         gencalendarmonth($year, $month);
 193                 }
 194
 195                 # Filling potential gaps in years (e.g. calendar goes from 2010 to 2014,
 196                 # and we just added year 2005. We have to add years 2006 to 2009).
 197                 return if $params{norecurse};
 198                 if ($wikistate{calendar}{minyear} > $year) {
 199                         foreach my $other ($year + 1 .. $wikistate{calendar}{minyear} - 1) {
 200                                 gencalendaryear($other, norecurse => 1);
 201                         }
 202                         $wikistate{calendar}{minyear} = $year;
 203                 }
 204                 if ($wikistate{calendar}{maxyear} < $year) {
 205                         foreach my $other ($wikistate{calendar}{maxyear} + 1 .. $year - 1) {
 206                                 gencalendaryear($other, norecurse => 1);
 207                         }
 208                         $wikistate{calendar}{maxyear} = $year;
 209                 }
 210         }
 211         if ($year < $wikistate{calendar}{minyear}) {
 212                 $wikistate{calendar}{minyear} = $year;
 213         }
 214         if ($year >  $wikistate{calendar}{maxyear}) {
 215                 $wikistate{calendar}{maxyear} = $year;
 216         }
 217 }
 218
 219 sub previousmonth($$$) {
 220         my $year = shift;
 221         my $month = shift;
 222         my $archivebase = shift;
 223
 224         if (not exists $wikistate{calendar}{minyear}) {
 225                 $wikistate{calendar}{minyear} = $year;
 226         }
 227
 228         my $pmonth = $month;
 229         my $pyear  = $year;
 230         while ((not exists $pagesources{"$archivebase/$pyear/" . sprintf("%02d", $pmonth)}) or ($pmonth == $month and $pyear == $year)) {
 231                 $pmonth -= 1;
 232                 if ($pmonth == 0) {
 233                         $pyear -= 1;
 234                         $pmonth = 12;
 235                         return ($pyear, $pmonth, 0) unless $pyear >= $wikistate{calendar}{minyear};
 236                 }
 237         }
 238         return ($pyear, $pmonth, 1);
 239 }
 240
 241 sub nextmonth($$$) {
 242         my $year = shift;
 243         my $month = shift;
 244         my $archivebase = shift;
 245
 246         if (not exists $wikistate{calendar}{maxyear}) {
 247                 $wikistate{calendar}{maxyear} = $year;
 248         }
 249
 250         my $nmonth = $month;
 251         my $nyear  = $year;
 252         while ((not exists $pagesources{"$archivebase/$nyear/" . sprintf("%02d", $nmonth)}) or ($nmonth == $month and $nyear == $year)) {
 253                 $nmonth += 1;
 254                 if ($nmonth == 13) {
 255                         $nyear += 1;
 256                         $nmonth = 1;
 257                         return ($nyear, $nmonth, 0) unless $nyear <= $wikistate{calendar}{maxyear};
 258                 }
 259         }
 260         return ($nyear, $nmonth, 1);
 261 }
 262
 263 sub previousyear($$) {
 264         my $year = shift;
 265         my $archivebase = shift;
 266
 267         my $pyear = $year - 1;
 268         while (not exists $pagesources{"$archivebase/$pyear"}) {
 269                 $pyear -= 1;
 270                 return ($pyear, 0) unless ($pyear >= $wikistate{calendar}{minyear});
 271         }
 272         return ($pyear, 1);
 273 }
 274
 275 sub nextyear($$) {
 276         my $year = shift;
 277         my $archivebase = shift;
 278
 279         my $nyear = $year + 1;
 280         while (not exists $pagesources{"$archivebase/$nyear"}) {
 281                 $nyear += 1;
 282                 return ($nyear, 0) unless ($nyear <= $wikistate{calendar}{maxyear});
 283         }
 284         return ($nyear, 1);
 285 }
 286
 287 sub format_month (@) {
 288         my %params=@_;
 289
 290         my %linkcache;
 291         foreach my $p (pagespec_match_list($params{page},
 292                                 "creation_year($params{year}) and creation_month($params{month}) and ($params{pages})",
 293                                 # add presence dependencies to update
 294                                 # month calendar when pages are added/removed
 295                                 deptype => deptype("presence"))) {
 296                 my $mtime = $IkiWiki::pagectime{$p};
 297                 my @date  = localtime($mtime);
 298                 my $mday  = $date[3];
 299                 my $month = $date[4] + 1;
 300                 my $year  = $date[5] + 1900;
 301                 my $mtag  = sprintf("%02d", $month);
 302
 303                 if (! $linkcache{"$year/$mtag/$mday"}) {
 304                         $linkcache{"$year/$mtag/$mday"} = [];
 305                 }
 306                 push(@{$linkcache{"$year/$mtag/$mday"}}, $p);
 307         }
 308
 309         my $archivebase = 'archives';
 310         $archivebase = $config{archivebase} if defined $config{archivebase};
 311         $archivebase = $params{archivebase} if defined $params{archivebase};
 312
 313         my ($pyear, $pmonth, $pvalid) = previousmonth($params{year}, $params{month}, $archivebase);
 314         my ($nyear, $nmonth, $nvalid) = nextmonth($params{year}, $params{month}, $archivebase);
 315
 316         # Add padding.
 317         $pmonth=sprintf("%02d", $pmonth);
 318         $nmonth=sprintf("%02d", $nmonth);
 319
 320         my $calendar="\n";
 321
 322         # When did this month start?
 323         my @monthstart = localtime(timelocal(0,0,0,1,$params{month}-1,$params{year}-1900));
 324
 325         my $future_dom = 0;
 326         my $today      = 0;
 327         if ($params{year} == $now[5]+1900 && $params{month} == $now[4]+1) {
 328                 $future_dom = $now[3]+1;
 329                 $today      = $now[3];
 330         }
 331
 332         # Find out month names for this, next, and previous months
 333         my $monthabbrev=strftime_utf8("%b", @monthstart);
 334         my $monthname=strftime_utf8("%B", @monthstart);
 335         my $pmonthname=strftime_utf8("%B", localtime(timelocal(0,0,0,1,$pmonth-1,$pyear-1900)));
 336         my $nmonthname=strftime_utf8("%B", localtime(timelocal(0,0,0,1,$nmonth-1,$nyear-1900)));
 337
 338         # Calculate URL's for monthly archives.
 339         my ($url, $purl, $nurl)=("$monthname $params{year}",'','');
 340         if (exists $pagesources{"$archivebase/$params{year}/$params{month}"}) {
 341                 $url = htmllink($params{page}, $params{destpage},
 342                         "$archivebase/$params{year}/".$params{month},
 343                         noimageinline => 1,
 344                         linktext => "$monthabbrev $params{year}",
 345                         title => $monthname);
 346         }
 347         add_depends($params{page}, "$archivebase/$params{year}/$params{month}",
 348                 deptype("presence"));
 349         if (exists $pagesources{"$archivebase/$pyear/$pmonth"}) {
 350                 $purl = htmllink($params{page}, $params{destpage},
 351                         "$archivebase/$pyear/$pmonth",
 352                         noimageinline => 1,
 353                         linktext => "\&larr;",
 354                         title => $pmonthname);
 355         }
 356         add_depends($params{page}, "$archivebase/$pyear/$pmonth",
 357                 deptype("presence"));
 358         if (exists $pagesources{"$archivebase/$nyear/$nmonth"}) {
 359                 $nurl = htmllink($params{page}, $params{destpage},
 360                         "$archivebase/$nyear/$nmonth",
 361                         noimageinline => 1,
 362                         linktext => "\&rarr;",
 363                         title => $nmonthname);
 364         }
 365         add_depends($params{page}, "$archivebase/$nyear/$nmonth",
 366                 deptype("presence"));
 367
 368         # Start producing the month calendar
 369         $calendar=<<EOF;
 370 <table class="month-calendar">
 371         <tr>
 372         <th class="month-calendar-arrow">$purl</th>
 373         <th class="month-calendar-head" colspan="5">$url</th>
 374         <th class="month-calendar-arrow">$nurl</th>
 375         </tr>
 376         <tr>
 377 EOF
 378
 379         # Suppose we want to start the week with day $week_start_day
 380         # If $monthstart[6] == 1
 381         my $week_start_day = $params{week_start_day};
 382
 383         my $start_day = 1 + (7 - $monthstart[6] + $week_start_day) % 7;
 384         my %downame;
 385         my %dowabbr;
 386         for my $dow ($week_start_day..$week_start_day+6) {
 387                 my @day=localtime(timelocal(0,0,0,$start_day++,$params{month}-1,$params{year}-1900));
 388                 my $downame = strftime_utf8("%A", @day);
 389                 my $dowabbr = substr($downame, 0, 1);
 390                 $downame{$dow % 7}=$downame;
 391                 $dowabbr{$dow % 7}=$dowabbr;
 392                 $calendar.= qq{\t\t<th class="month-calendar-day-head $downame" title="$downame">$dowabbr</th>\n};
 393         }
 394
 395         $calendar.=<<EOF;
 396         </tr>
 397 EOF
 398
 399         my $wday;
 400         # we start with a week_start_day, and skip until we get to the first
 401         for ($wday=$week_start_day; $wday != $monthstart[6]; $wday++, $wday %= 7) {
 402                 $calendar.=qq{\t<tr>\n} if $wday == $week_start_day;
 403                 $calendar.=qq{\t\t<td class="month-calendar-day-noday $downame{$wday}">&nbsp;</td>\n};
 404         }
 405
 406         # At this point, either the first is a week_start_day, in which case
 407         # nothing has been printed, or else we are in the middle of a row.
 408         for (my $day = 1; $day <= month_days(year => $params{year}, month => $params{month});
 409              $day++, $wday++, $wday %= 7) {
 410                 # At this point, on a week_start_day, we close out a row,
 411                 # and start a new one -- unless it is week_start_day on the
 412                 # first, where we do not close a row -- since none was started.
 413                 if ($wday == $week_start_day) {
 414                         $calendar.=qq{\t</tr>\n} unless $day == 1;
 415                         $calendar.=qq{\t<tr>\n};
 416                 }
 417
 418                 my $tag;
 419                 my $key="$params{year}/$params{month}/$day";
 420                 if (defined $linkcache{$key}) {
 421                         if ($day == $today) {
 422                                 $tag='month-calendar-day-this-day';
 423                         }
 424                         else {
 425                                 $tag='month-calendar-day-link';
 426                         }
 427                         $calendar.=qq{\t\t<td class="$tag $downame{$wday}">};
 428                         $calendar.=qq{<div class='popup'>$day<div class='balloon'>};
 429                         # Several postings on this page
 430                         $calendar.=qq{<ul>};
 431                         foreach my $page (@{$linkcache{$key}}) {
 432                                 $calendar.= qq{\n\t\t\t<li>};
 433                                 my $title;
 434                                 if (exists $pagestate{$page}{meta}{title}) {
 435                                         $title = "$pagestate{$page}{meta}{title}";
 436                                 }
 437                                 else {
 438                                         $title = pagetitle(IkiWiki::basename($page));
 439                                 }
 440                                 $calendar.=htmllink($params{page}, $params{destpage},
 441                                         $page,
 442                                         noimageinline => 1,
 443                                         linktext => $title,
 444                                         title => $title);
 445                                 $calendar.= '</li>';
 446                         }
 447                         $calendar.=qq{\n\t\t</ul>};
 448                         $calendar.=qq{</div></div>};
 449                         $calendar.=qq{</td>\n};
 450                 }
 451                 else {
 452                         if ($day == $today) {
 453                                 $tag='month-calendar-day-this-day';
 454                         }
 455                         elsif ($day == $future_dom) {
 456                                 $tag='month-calendar-day-future';
 457                         }
 458                         else {
 459                                 $tag='month-calendar-day-nolink';
 460                         }
 461                         $calendar.=qq{\t\t<td class="$tag $downame{$wday}">$day</td>\n};
 462                 }
 463         }
 464
 465         # finish off the week
 466         for (; $wday != $week_start_day; $wday++, $wday %= 7) {
 467                 $calendar.=qq{\t\t<td class="month-calendar-day-noday $downame{$wday}">&nbsp;</td>\n};
 468         }
 469         $calendar.=<<EOF;
 470         </tr>
 471 </table>
 472 EOF
 473
 474         return $calendar;
 475 }
 476
 477 sub format_year (@) {
 478         my %params=@_;
 479
 480         my @post_months;
 481         foreach my $p (pagespec_match_list($params{page},
 482                                 "creation_year($params{year}) and ($params{pages})",
 483                                 # add presence dependencies to update
 484                                 # year calendar's links to months when
 485                                 # pages are added/removed
 486                                 deptype => deptype("presence"))) {
 487                 my $mtime = $IkiWiki::pagectime{$p};
 488                 my @date  = localtime($mtime);
 489                 my $month = $date[4] + 1;
 490
 491                 $post_months[$month]++;
 492         }
 493
 494         my $calendar="\n";
 495
 496         my $archivebase = 'archives';
 497         $archivebase = $config{archivebase} if defined $config{archivebase};
 498         $archivebase = $params{archivebase} if defined $params{archivebase};
 499
 500         my ($pyear, $pvalid) = previousyear($params{year}, $archivebase);
 501         my ($nyear, $nvalid) = nextyear($params{year}, $archivebase);
 502
 503         my $thisyear = $now[5]+1900;
 504         my $future_month = 0;
 505         $future_month = $now[4]+1 if $params{year} == $thisyear;
 506
 507         # calculate URL's for previous and next years
 508         my ($url, $purl, $nurl)=("$params{year}",'','');
 509         if (exists $pagesources{"$archivebase/$params{year}"}) {
 510                 $url = htmllink($params{page}, $params{destpage},
 511                         "$archivebase/$params{year}",
 512                         noimageinline => 1,
 513                         linktext => $params{year},
 514                         title => $params{year});
 515         }
 516         add_depends($params{page}, "$archivebase/$params{year}", deptype("presence"));
 517         if (exists $pagesources{"$archivebase/$pyear"}) {
 518                 $purl = htmllink($params{page}, $params{destpage},
 519                         "$archivebase/$pyear",
 520                         noimageinline => 1,
 521                         linktext => "\&larr;",
 522                         title => $pyear);
 523         }
 524         add_depends($params{page}, "$archivebase/$pyear", deptype("presence"));
 525         if (exists $pagesources{"$archivebase/$nyear"}) {
 526                 $nurl = htmllink($params{page}, $params{destpage},
 527                         "$archivebase/$nyear",
 528                         noimageinline => 1,
 529                         linktext => "\&rarr;",
 530                         title => $nyear);
 531         }
 532         add_depends($params{page}, "$archivebase/$nyear", deptype("presence"));
 533
 534         # Start producing the year calendar
 535         my $m=$params{months_per_row}-2;
 536         $calendar=<<EOF;
 537 <table class="year-calendar">
 538         <tr>
 539         <th class="year-calendar-arrow">$purl</th>
 540         <th class="year-calendar-head" colspan="$m">$url</th>
 541         <th class="year-calendar-arrow">$nurl</th>
 542         </tr>
 543         <tr>
 544                 <th class="year-calendar-subhead" colspan="$params{months_per_row}">Months</th>
 545         </tr>
 546 EOF
 547
 548         for (my $month = 1; $month <= 12; $month++) {
 549                 my @day=localtime(timelocal(0,0,0,15,$month-1,$params{year}-1900));
 550                 my $murl;
 551                 my $monthname = strftime_utf8("%B", @day);
 552                 my $monthabbr = strftime_utf8("%b", @day);
 553                 $calendar.=qq{\t<tr>\n}  if ($month % $params{months_per_row} == 1);
 554                 my $tag;
 555                 my $mtag=sprintf("%02d", $month);
 556                 if ($month == $params{month} && $thisyear == $params{year}) {
 557                         $tag = 'year-calendar-this-month';
 558                 }
 559                 elsif ($pagesources{"$archivebase/$params{year}/$mtag"}) {
 560                         $tag = 'year-calendar-month-link';
 561                 }
 562                 elsif ($future_month && $month >= $future_month) {
 563                         $tag = 'year-calendar-month-future';
 564                 }
 565                 else {
 566                         $tag = 'year-calendar-month-nolink';
 567                 }
 568
 569                 if ($pagesources{"$archivebase/$params{year}/$mtag"} &&
 570                     $post_months[$mtag]) {
 571                         $murl = htmllink($params{page}, $params{destpage},
 572                                 "$archivebase/$params{year}/$mtag",
 573                                 noimageinline => 1,
 574                                 linktext => $monthabbr,
 575                                 title => $monthname);
 576                         $calendar.=qq{\t<td class="$tag">};
 577                         $calendar.=$murl;
 578                         $calendar.=qq{\t</td>\n};
 579                 }
 580                 else {
 581                         $calendar.=qq{\t<td class="$tag">$monthabbr</td>\n};
 582                 }
 583                 add_depends($params{page}, "$archivebase/$params{year}/$mtag",
 584                         deptype("presence"));
 585
 586                 $calendar.=qq{\t</tr>\n} if ($month % $params{months_per_row} == 0);
 587         }
 588
 589         $calendar.=<<EOF;
 590 </table>
 591 EOF
 592
 593         return $calendar;
 594 }
 595
 596 sub setnextchange ($$) {
 597         my $page=shift;
 598         my $timestamp=shift;
 599
 600         if (! exists $pagestate{$page}{calendar}{nextchange} ||
 601             $pagestate{$page}{calendar}{nextchange} > $timestamp) {
 602                 $pagestate{$page}{calendar}{nextchange}=$timestamp;
 603         }
 604 }
 605
 606 sub preprocess (@) {
 607         my %params=@_;
 608
 609         my $thisyear=1900 + $now[5];
 610         my $thismonth=1 + $now[4];
 611
 612         $params{pages} = "*"            unless defined $params{pages};
 613         $params{type}  = "month"        unless defined $params{type};
 614         $params{week_start_day} = 0     unless defined $params{week_start_day};
 615         $params{months_per_row} = 3     unless defined $params{months_per_row};
 616         $params{year}  = $thisyear      unless defined $params{year};
 617         $params{month} = $thismonth     unless defined $params{month};
 618
 619         my $relativeyear=0;
 620         if ($params{year} < 1) {
 621                 $relativeyear=1;
 622                 $params{year}=$thisyear+$params{year};
 623         }
 624         my $relativemonth=0;
 625         if ($params{month} < 1) {
 626                 $relativemonth=1;
 627                 my $monthoff=$params{month};
 628                 $params{month}=($thismonth+$monthoff) % 12;
 629                 $params{month}=12 if $params{month}==0;
 630                 my $yearoff=POSIX::ceil(($thismonth-$params{month}) / -12)
 631                         - int($monthoff / 12);
 632                 $params{year}-=$yearoff;
 633         }
 634
 635         $params{month} = sprintf("%02d", $params{month});
 636         $changed{$params{year}}{$params{month}} = 1;
 637
 638         if ($params{type} eq 'month' && $params{year} == $thisyear
 639             && $params{month} == $thismonth) {
 640                 # calendar for current month, updates next midnight
 641                 setnextchange($params{destpage}, ($time
 642                         + (60 - $now[0])                # seconds
 643                         + (59 - $now[1]) * 60           # minutes
 644                         + (23 - $now[2]) * 60 * 60      # hours
 645                 ));
 646         }
 647         elsif ($params{type} eq 'month' &&
 648                (($params{year} == $thisyear && $params{month} > $thismonth) ||
 649                 $params{year} > $thisyear)) {
 650                 # calendar for upcoming month, updates 1st of that month
 651                 setnextchange($params{destpage},
 652                         timelocal(0, 0, 0, 1, $params{month}-1, $params{year}));
 653         }
 654         elsif (($params{type} eq 'year' && $params{year} == $thisyear) ||
 655                $relativemonth) {
 656                 # Calendar for current year updates 1st of next month.
 657                 # Any calendar relative to the current month also updates
 658                 # then.
 659                 if ($thismonth < 12) {
 660                         setnextchange($params{destpage},
 661                                 timelocal(0, 0, 0, 1, $thismonth+1-1, $params{year}));
 662                 }
 663                 else {
 664                         setnextchange($params{destpage},
 665                                 timelocal(0, 0, 0, 1, 1-1, $params{year}+1));
 666                 }
 667         }
 668         elsif ($relativeyear) {
 669                 # Any calendar relative to the current year updates 1st
 670                 # of next year.
 671                 setnextchange($params{destpage},
 672                         timelocal(0, 0, 0, 1, 1-1, $thisyear+1));
 673         }
 674         elsif ($params{type} eq 'year' && $params{year} > $thisyear) {
 675                 # calendar for upcoming year, updates 1st of that year
 676                 setnextchange($params{destpage},
 677                         timelocal(0, 0, 0, 1, 1-1, $params{year}));
 678         }
 679         else {
 680                 # calendar for past month or year, does not need
 681                 # to update any more
 682                 delete $pagestate{$params{destpage}}{calendar};
 683         }
 684
 685         my $calendar="";
 686         if ($params{type} eq 'month') {
 687                 $calendar=format_month(%params);
 688         }
 689         elsif ($params{type} eq 'year') {
 690                 $calendar=format_year(%params);
 691         }
 692
 693         return "\n<div><div class=\"calendar\">$calendar</div></div>\n";
 694 } #}}
 695
 696 sub needsbuild (@) {
 697         my $needsbuild=shift;
 698         foreach my $page (keys %pagestate) {
 699                 if (exists $pagestate{$page}{calendar}{nextchange}) {
 700                         if ($pagestate{$page}{calendar}{nextchange} <= $time) {
 701                                 # force a rebuild so the calendar shows
 702                                 # the current day
 703                                 push @$needsbuild, $pagesources{$page};
 704                         }
 705                         if (exists $pagesources{$page} &&
 706                             grep { $_ eq $pagesources{$page} } @$needsbuild) {
 707                                 # remove state, will be re-added if
 708                                 # the calendar is still there during the
 709                                 # rebuild
 710                                 delete $pagestate{$page}{calendar};
 711                         }
 712                 }
 713         }
 714
 715         return $needsbuild;
 716 }
 717
 718 sub scan (@) {
 719         my %params=@_;
 720         my $page=$params{page};
 721
 722         return unless $config{calendar_autocreate};
 723
 724         # Check if year pages have to be generated
 725         if (pagespec_match($page, $config{archive_pagespec})) {
 726                 my @ctime = localtime($IkiWiki::pagectime{$page});
 727                 gencalendaryear($ctime[5]+1900);
 728                 gencalendarmonth($ctime[5]+1900, $ctime[4]+1);
 729         }
 730 }
 731
 732 1