IkiWiki/Render.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki;
   8 use Encode;
   9
  10 my %backlinks;
  11 my $backlinks_calculated=0;
  12
  13 sub calculate_backlinks () {
  14         return if $backlinks_calculated;
  15         %backlinks=();
  16         foreach my $page (keys %links) {
  17                 foreach my $link (@{$links{$page}}) {
  18                         my $bestlink=bestlink($page, $link);
  19                         if (length $bestlink && $bestlink ne $page) {
  20                                 $backlinks{$bestlink}{$page}=1;
  21                         }
  22                 }
  23         }
  24         $backlinks_calculated=1;
  25 }
  26
  27 sub backlinks ($) {
  28         my $page=shift;
  29
  30         calculate_backlinks();
  31
  32         my @links;
  33         foreach my $p (keys %{$backlinks{$page}}) {
  34                 my $href=urlto($p, $page);
  35
  36                 # Trim common dir prefixes from both pages.
  37                 my $p_trimmed=$p;
  38                 my $page_trimmed=$page;
  39                 my $dir;
  40                 1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
  41                         defined $dir &&
  42                         $p_trimmed=~s/^\Q$dir\E// &&
  43                         $page_trimmed=~s/^\Q$dir\E//;
  44
  45                 push @links, { url => $href, page => pagetitle($p_trimmed) };
  46         }
  47         return @links;
  48 }
  49
  50 sub genpage ($$) {
  51         my $page=shift;
  52         my $content=shift;
  53
  54         my $templatefile;
  55         run_hooks(templatefile => sub {
  56                 return if defined $templatefile;
  57                 my $file=shift->(page => $page);
  58                 if (defined $file && defined template_file($file)) {
  59                         $templatefile=$file;
  60                 }
  61         });
  62         my $template=template(defined $templatefile ? $templatefile : 'page.tmpl', blind_cache => 1);
  63         my $actions=0;
  64
  65         if (length $config{cgiurl}) {
  66                 $template->param(editurl => cgiurl(do => "edit", page => $page))
  67                         if IkiWiki->can("cgi_editpage");
  68                 $template->param(prefsurl => cgiurl(do => "prefs"));
  69                 $actions++;
  70         }
  71
  72         if (defined $config{historyurl} && length $config{historyurl}) {
  73                 my $u=$config{historyurl};
  74                 $u=~s/\[\[file\]\]/$pagesources{$page}/g;
  75                 $template->param(historyurl => $u);
  76                 $actions++;
  77         }
  78         if ($config{discussion}) {
  79                 my $discussionlink=lc(gettext("Discussion"));
  80                 if ($page !~ /.*\/\Q$discussionlink\E$/ &&
  81                    (length $config{cgiurl} ||
  82                     exists $links{$page."/".$discussionlink})) {
  83                         $template->param(discussionlink => htmllink($page, $page, gettext("Discussion"), noimageinline => 1, forcesubpage => 1));
  84                         $actions++;
  85                 }
  86         }
  87
  88         if ($actions) {
  89                 $template->param(have_actions => 1);
  90         }
  91
  92         my @backlinks=sort { $a->{page} cmp $b->{page} } backlinks($page);
  93         my ($backlinks, $more_backlinks);
  94         if (@backlinks <= $config{numbacklinks} || ! $config{numbacklinks}) {
  95                 $backlinks=\@backlinks;
  96                 $more_backlinks=[];
  97         }
  98         else {
  99                 $backlinks=[@backlinks[0..$config{numbacklinks}-1]];
 100                 $more_backlinks=[@backlinks[$config{numbacklinks}..$#backlinks]];
 101         }
 102
 103         $template->param(
 104                 title => $page eq 'index'
 105                         ? $config{wikiname}
 106                         : pagetitle(basename($page)),
 107                 wikiname => $config{wikiname},
 108                 content => $content,
 109                 backlinks => $backlinks,
 110                 more_backlinks => $more_backlinks,
 111                 mtime => displaytime($pagemtime{$page}),
 112                 ctime => displaytime($pagectime{$page}),
 113                 baseurl => baseurl($page),
 114         );
 115
 116         run_hooks(pagetemplate => sub {
 117                 shift->(page => $page, destpage => $page, template => $template);
 118         });
 119
 120         $content=$template->output;
 121
 122         run_hooks(postscan => sub {
 123                 shift->(page => $page, content => $content);
 124         });
 125
 126         run_hooks(format => sub {
 127                 $content=shift->(
 128                         page => $page,
 129                         content => $content,
 130                 );
 131         });
 132
 133         return $content;
 134 }
 135
 136 sub scan ($) {
 137         my $file=shift;
 138
 139         my $type=pagetype($file);
 140         if (defined $type) {
 141                 my $srcfile=srcfile($file);
 142                 my $content=readfile($srcfile);
 143                 my $page=pagename($file);
 144                 will_render($page, htmlpage($page), 1);
 145
 146                 if ($config{discussion}) {
 147                         # Discussion links are a special case since they're
 148                         # not in the text of the page, but on its template.
 149                         $links{$page}=[ $page."/".lc(gettext("Discussion")) ];
 150                 }
 151                 else {
 152                         $links{$page}=[];
 153                 }
 154
 155                 run_hooks(scan => sub {
 156                         shift->(
 157                                 page => $page,
 158                                 content => $content,
 159                         );
 160                 });
 161
 162                 # Preprocess in scan-only mode.
 163                 preprocess($page, $page, $content, 1);
 164         }
 165         else {
 166                 will_render($file, $file, 1);
 167         }
 168 }
 169
 170 sub fast_file_copy (@) {
 171         my $srcfile=shift;
 172         my $destfile=shift;
 173         my $srcfd=shift;
 174         my $destfd=shift;
 175         my $cleanup=shift;
 176
 177         my $blksize = 16384;
 178         my ($len, $buf, $written);
 179         while ($len = sysread $srcfd, $buf, $blksize) {
 180                 if (! defined $len) {
 181                         next if $! =~ /^Interrupted/;
 182                         error("failed to read $srcfile: $!", $cleanup);
 183                 }
 184                 my $offset = 0;
 185                 while ($len) {
 186                         defined($written = syswrite $destfd, $buf, $len, $offset)
 187                                 or error("failed to write $destfile: $!", $cleanup);
 188                         $len -= $written;
 189                         $offset += $written;
 190                 }
 191         }
 192 }
 193
 194 sub render ($) {
 195         my $file=shift;
 196
 197         my $type=pagetype($file);
 198         my $srcfile=srcfile($file);
 199         if (defined $type) {
 200                 my $page=pagename($file);
 201                 delete $depends{$page};
 202                 will_render($page, htmlpage($page), 1);
 203                 return if $type=~/^_/;
 204
 205                 my $content=htmlize($page, $page, $type,
 206                         linkify($page, $page,
 207                         preprocess($page, $page,
 208                         filter($page, $page,
 209                         readfile($srcfile)))));
 210
 211                 my $output=htmlpage($page);
 212                 writefile($output, $config{destdir}, genpage($page, $content));
 213         }
 214         else {
 215                 delete $depends{$file};
 216                 will_render($file, $file, 1);
 217
 218                 if ($config{hardlink}) {
 219                         # only hardlink if owned by same user
 220                         my @stat=stat($srcfile);
 221                         if ($stat[4] == $>) {
 222                                 prep_writefile($file, $config{destdir});
 223                                 unlink($config{destdir}."/".$file);
 224                                 if (link($srcfile, $config{destdir}."/".$file)) {
 225                                         return;
 226                                 }
 227                         }
 228                         # if hardlink fails, fall back to copying
 229                 }
 230
 231                 my $srcfd=readfile($srcfile, 1, 1);
 232                 writefile($file, $config{destdir}, undef, 1, sub {
 233                         fast_file_copy($srcfile, $file, $srcfd, @_);
 234                 });
 235         }
 236 }
 237
 238 sub prune ($) {
 239         my $file=shift;
 240
 241         unlink($file);
 242         my $dir=dirname($file);
 243         while (rmdir($dir)) {
 244                 $dir=dirname($dir);
 245         }
 246 }
 247
 248 sub refresh () {
 249         # security check, avoid following symlinks in the srcdir path by default
 250         my $test=$config{srcdir};
 251         while (length $test) {
 252                 if (-l $test && ! $config{allow_symlinks_before_srcdir}) {
 253                         error(sprintf(gettext("symlink found in srcdir path (%s) -- set allow_symlinks_before_srcdir to allow this"), $test));
 254                 }
 255                 unless ($test=~s/\/+$//) {
 256                         $test=dirname($test);
 257                 }
 258         }
 259
 260         run_hooks(refresh => sub { shift->() });
 261
 262         # find existing pages
 263         my %exists;
 264         my @files;
 265         eval q{use File::Find};
 266         error($@) if $@;
 267         find({
 268                 no_chdir => 1,
 269                 wanted => sub {
 270                         $_=decode_utf8($_);
 271                         if (file_pruned($_, $config{srcdir})) {
 272                                 $File::Find::prune=1;
 273                         }
 274                         elsif (! -l $_ && ! -d _) {
 275                                 my ($f)=/$config{wiki_file_regexp}/; # untaint
 276                                 if (! defined $f) {
 277                                         warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
 278                                 }
 279                                 else {
 280                                         $f=~s/^\Q$config{srcdir}\E\/?//;
 281                                         push @files, $f;
 282                                         my $pagename = pagename($f);
 283                                         if ($exists{$pagename}) {
 284                                                 debug(sprintf(gettext("%s has multiple possible source pages"), $pagename));
 285                                         }
 286                                         $exists{$pagename}=1;
 287                                 }
 288                         }
 289                 },
 290         }, $config{srcdir});
 291         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 292                 find({
 293                         no_chdir => 1,
 294                         wanted => sub {
 295                                 $_=decode_utf8($_);
 296                                 if (file_pruned($_, $dir)) {
 297                                         $File::Find::prune=1;
 298                                 }
 299                                 elsif (! -l $_ && ! -d _) {
 300                                         my ($f)=/$config{wiki_file_regexp}/; # untaint
 301                                         if (! defined $f) {
 302                                                 warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
 303                                         }
 304                                         else {
 305                                                 $f=~s/^\Q$dir\E\/?//;
 306                                                 # avoid underlaydir
 307                                                 # override attacks; see
 308                                                 # security.mdwn
 309                                                 if (! -l "$config{srcdir}/$f" &&
 310                                                     ! -e _) {
 311                                                         my $page=pagename($f);
 312                                                         if (! $exists{$page}) {
 313                                                                 push @files, $f;
 314                                                                 $exists{$page}=1;
 315                                                         }
 316                                                 }
 317                                         }
 318                                 }
 319                         },
 320                 }, $dir);
 321         };
 322
 323         my (%rendered, @add, @del, @internal);
 324         # check for added or removed pages
 325         foreach my $file (@files) {
 326                 my $page=pagename($file);
 327                 if (exists $pagesources{$page} && $pagesources{$page} ne $file) {
 328                         # the page has changed its type
 329                         $forcerebuild{$page}=1;
 330                 }
 331                 $pagesources{$page}=$file;
 332                 if (! $pagemtime{$page}) {
 333                         if (isinternal($page)) {
 334                                 push @internal, $file;
 335                         }
 336                         else {
 337                                 push @add, $file;
 338                                 if ($config{getctime} && -e "$config{srcdir}/$file") {
 339                                         eval {
 340                                                 my $time=rcs_getctime("$config{srcdir}/$file");
 341                                                 $pagectime{$page}=$time;
 342                                         };
 343                                         if ($@) {
 344                                                 print STDERR $@;
 345                                         }
 346                                 }
 347                         }
 348                         $pagecase{lc $page}=$page;
 349                         if (! exists $pagectime{$page}) {
 350                                 $pagectime{$page}=(srcfile_stat($file))[10];
 351                         }
 352                 }
 353         }
 354         foreach my $page (keys %pagemtime) {
 355                 if (! $exists{$page}) {
 356                         if (isinternal($page)) {
 357                                 push @internal, $pagesources{$page};
 358                         }
 359                         else {
 360                                 debug(sprintf(gettext("removing old page %s"), $page));
 361                                 push @del, $pagesources{$page};
 362                         }
 363                         $links{$page}=[];
 364                         $renderedfiles{$page}=[];
 365                         $pagemtime{$page}=0;
 366                         prune($config{destdir}."/".$_)
 367                                 foreach @{$oldrenderedfiles{$page}};
 368                         delete $pagesources{$page};
 369                         foreach (keys %destsources) {
 370                                 if ($destsources{$_} eq $page) {
 371                                         delete $destsources{$_};
 372                                 }
 373                         }
 374                 }
 375         }
 376
 377         # find changed and new files
 378         my @needsbuild;
 379         foreach my $file (@files) {
 380                 my $page=pagename($file);
 381                 my ($srcfile, @stat)=srcfile_stat($file);
 382                 if (! exists $pagemtime{$page} ||
 383                     $stat[9] > $pagemtime{$page} ||
 384                     $forcerebuild{$page}) {
 385                         $pagemtime{$page}=$stat[9];
 386                         if (isinternal($page)) {
 387                                 push @internal, $file;
 388                                 # Preprocess internal page in scan-only mode.
 389                                 preprocess($page, $page, readfile($srcfile), 1);
 390                         }
 391                         else {
 392                                 push @needsbuild, $file;
 393                         }
 394                 }
 395         }
 396         run_hooks(needsbuild => sub { shift->(\@needsbuild) });
 397
 398         # scan and render files
 399         foreach my $file (@needsbuild) {
 400                 debug(sprintf(gettext("scanning %s"), $file));
 401                 scan($file);
 402         }
 403         calculate_backlinks();
 404         foreach my $file (@needsbuild) {
 405                 debug(sprintf(gettext("rendering %s"), $file));
 406                 render($file);
 407                 $rendered{$file}=1;
 408         }
 409         foreach my $file (@internal) {
 410                 # internal pages are not rendered
 411                 my $page=pagename($file);
 412                 delete $depends{$page};
 413                 foreach my $old (@{$renderedfiles{$page}}) {
 414                         delete $destsources{$old};
 415                 }
 416                 $renderedfiles{$page}=[];
 417         }
 418
 419         # rebuild pages that link to added or removed pages
 420         if (@add || @del) {
 421                 foreach my $f (@add, @del) {
 422                         my $p=pagename($f);
 423                         foreach my $page (keys %{$backlinks{$p}}) {
 424                                 my $file=$pagesources{$page};
 425                                 next if $rendered{$file};
 426                                 debug(sprintf(gettext("rendering %s, which links to %s"), $file, $p));
 427                                 render($file);
 428                                 $rendered{$file}=1;
 429                         }
 430                 }
 431         }
 432
 433         if (%rendered || @del || @internal) {
 434                 my @changed=(keys %rendered, @del);
 435
 436                 # rebuild dependant pages
 437                 foreach my $f (@files) {
 438                         next if $rendered{$f};
 439                         my $p=pagename($f);
 440                         if (exists $depends{$p}) {
 441                                 # only consider internal files
 442                                 # if the page explicitly depends on such files
 443                                 foreach my $file (@changed, $depends{$p}=~/internal\(/ ? @internal : ()) {
 444                                         next if $f eq $file;
 445                                         my $page=pagename($file);
 446                                         if (pagespec_match($page, $depends{$p}, location => $p)) {
 447                                                 debug(sprintf(gettext("rendering %s, which depends on %s"), $f, $page));
 448                                                 render($f);
 449                                                 $rendered{$f}=1;
 450                                                 last;
 451                                         }
 452                                 }
 453                         }
 454                 }
 455
 456                 # handle backlinks; if a page has added/removed links,
 457                 # update the pages it links to
 458                 my %linkchanged;
 459                 foreach my $file (@changed) {
 460                         my $page=pagename($file);
 461
 462                         if (exists $links{$page}) {
 463                                 foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
 464                                         if (length $link &&
 465                                             (! exists $oldlinks{$page} ||
 466                                              ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {
 467                                                 $linkchanged{$link}=1;
 468                                         }
 469                                 }
 470                         }
 471                         if (exists $oldlinks{$page}) {
 472                                 foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
 473                                         if (length $link &&
 474                                             (! exists $links{$page} ||
 475                                              ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {
 476                                                 $linkchanged{$link}=1;
 477                                         }
 478                                 }
 479                         }
 480                 }
 481
 482                 foreach my $link (keys %linkchanged) {
 483                         my $linkfile=$pagesources{$link};
 484                         if (defined $linkfile) {
 485                                 next if $rendered{$linkfile};
 486                                 debug(sprintf(gettext("rendering %s, to update its backlinks"), $linkfile));
 487                                 render($linkfile);
 488                                 $rendered{$linkfile}=1;
 489                         }
 490                 }
 491         }
 492
 493         # remove no longer rendered files
 494         foreach my $src (keys %rendered) {
 495                 my $page=pagename($src);
 496                 foreach my $file (@{$oldrenderedfiles{$page}}) {
 497                         if (! grep { $_ eq $file } @{$renderedfiles{$page}}) {
 498                                 debug(sprintf(gettext("removing %s, no longer rendered by %s"), $file, $page));
 499                                 prune($config{destdir}."/".$file);
 500                         }
 501                 }
 502         }
 503
 504         if (@del) {
 505                 run_hooks(delete => sub { shift->(@del) });
 506         }
 507         if (%rendered) {
 508                 run_hooks(change => sub { shift->(keys %rendered) });
 509         }
 510 }
 511
 512 sub commandline_render () {
 513         lockwiki();
 514         loadindex();
 515         unlockwiki();
 516
 517         my $srcfile=possibly_foolish_untaint($config{render});
 518         my $file=$srcfile;
 519         $file=~s/\Q$config{srcdir}\E\/?//;
 520
 521         my $type=pagetype($file);
 522         die sprintf(gettext("ikiwiki: cannot render %s"), $srcfile)."\n" unless defined $type;
 523         my $content=readfile($srcfile);
 524         my $page=pagename($file);
 525         $pagesources{$page}=$file;
 526         $content=filter($page, $page, $content);
 527         $content=preprocess($page, $page, $content);
 528         $content=linkify($page, $page, $content);
 529         $content=htmlize($page, $page, $type, $content);
 530         $pagemtime{$page}=(stat($srcfile))[9];
 531         $pagectime{$page}=$pagemtime{$page} if ! exists $pagectime{$page};
 532
 533         print genpage($page, $content);
 534         exit 0;
 535 }
 536
 537 1