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 our %brokenlinks;
  12 my $links_calculated=0;
  13
  14 sub calculate_links () {
  15         return if $links_calculated;
  16         %backlinks=%brokenlinks=();
  17         foreach my $page (keys %links) {
  18                 foreach my $link (@{$links{$page}}) {
  19                         my $bestlink=bestlink($page, $link);
  20                         if (length $bestlink) {
  21                                 $backlinks{$bestlink}{$page}=1
  22                                         if $bestlink ne $page;
  23                         }
  24                         else {
  25                                 push @{$brokenlinks{$link}}, $page;
  26                         }
  27                 }
  28         }
  29         $links_calculated=1;
  30 }
  31
  32 sub backlink_pages ($) {
  33         my $page=shift;
  34
  35         calculate_links();
  36
  37         return keys %{$backlinks{$page}};
  38 }
  39
  40 sub backlinks ($) {
  41         my $page=shift;
  42
  43         my @links;
  44         foreach my $p (backlink_pages($page)) {
  45                 my $href=urlto($p, $page);
  46
  47                 # Trim common dir prefixes from both pages.
  48                 my $p_trimmed=$p;
  49                 my $page_trimmed=$page;
  50                 my $dir;
  51                 1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
  52                         defined $dir &&
  53                         $p_trimmed=~s/^\Q$dir\E// &&
  54                         $page_trimmed=~s/^\Q$dir\E//;
  55
  56                 push @links, { url => $href, page => pagetitle($p_trimmed) };
  57         }
  58         return @links;
  59 }
  60
  61 sub genpage ($$) {
  62         my $page=shift;
  63         my $content=shift;
  64
  65         my $templatefile;
  66         run_hooks(templatefile => sub {
  67                 return if defined $templatefile;
  68                 my $file=shift->(page => $page);
  69                 if (defined $file && defined template_file($file)) {
  70                         $templatefile=$file;
  71                 }
  72         });
  73         my $template=template(defined $templatefile ? $templatefile : 'page.tmpl', blind_cache => 1);
  74         my $actions=0;
  75
  76         if (length $config{cgiurl}) {
  77                 $template->param(editurl => cgiurl(do => "edit", page => $page))
  78                         if IkiWiki->can("cgi_editpage");
  79                 $template->param(prefsurl => cgiurl(do => "prefs"))
  80                         if exists $hooks{auth};
  81                 $actions++;
  82         }
  83
  84         if (defined $config{historyurl} && length $config{historyurl}) {
  85                 my $u=$config{historyurl};
  86                 $u=~s/\[\[file\]\]/$pagesources{$page}/g;
  87                 $template->param(historyurl => $u);
  88                 $actions++;
  89         }
  90         if ($config{discussion}) {
  91                 if ($page !~ /.*\/\Q$config{discussionpage}\E$/ &&
  92                    (length $config{cgiurl} ||
  93                     exists $links{$page."/".$config{discussionpage}})) {
  94                         $template->param(discussionlink => htmllink($page, $page, $config{discussionpage}, noimageinline => 1, forcesubpage => 1));
  95                         $actions++;
  96                 }
  97         }
  98
  99         if ($actions) {
 100                 $template->param(have_actions => 1);
 101         }
 102
 103         my @backlinks=sort { $a->{page} cmp $b->{page} } backlinks($page);
 104         my ($backlinks, $more_backlinks);
 105         if (@backlinks <= $config{numbacklinks} || ! $config{numbacklinks}) {
 106                 $backlinks=\@backlinks;
 107                 $more_backlinks=[];
 108         }
 109         else {
 110                 $backlinks=[@backlinks[0..$config{numbacklinks}-1]];
 111                 $more_backlinks=[@backlinks[$config{numbacklinks}..$#backlinks]];
 112         }
 113
 114         $template->param(
 115                 title => $page eq 'index'
 116                         ? $config{wikiname}
 117                         : pagetitle(basename($page)),
 118                 wikiname => $config{wikiname},
 119                 content => $content,
 120                 backlinks => $backlinks,
 121                 more_backlinks => $more_backlinks,
 122                 mtime => displaytime($pagemtime{$page}),
 123                 ctime => displaytime($pagectime{$page}),
 124                 baseurl => baseurl($page),
 125         );
 126
 127         run_hooks(pagetemplate => sub {
 128                 shift->(page => $page, destpage => $page, template => $template);
 129         });
 130
 131         $content=$template->output;
 132
 133         run_hooks(postscan => sub {
 134                 shift->(page => $page, content => $content);
 135         });
 136
 137         run_hooks(format => sub {
 138                 $content=shift->(
 139                         page => $page,
 140                         content => $content,
 141                 );
 142         });
 143
 144         return $content;
 145 }
 146
 147 sub scan ($) {
 148         my $file=shift;
 149
 150         my $type=pagetype($file);
 151         if (defined $type) {
 152                 my $srcfile=srcfile($file);
 153                 my $content=readfile($srcfile);
 154                 my $page=pagename($file);
 155                 will_render($page, htmlpage($page), 1);
 156
 157                 if ($config{discussion}) {
 158                         # Discussion links are a special case since they're
 159                         # not in the text of the page, but on its template.
 160                         $links{$page}=[ $page."/".lc($config{discussionpage}) ];
 161                 }
 162                 else {
 163                         $links{$page}=[];
 164                 }
 165
 166                 run_hooks(scan => sub {
 167                         shift->(
 168                                 page => $page,
 169                                 content => $content,
 170                         );
 171                 });
 172
 173                 # Preprocess in scan-only mode.
 174                 preprocess($page, $page, $content, 1);
 175         }
 176         else {
 177                 will_render($file, $file, 1);
 178         }
 179 }
 180
 181 sub fast_file_copy (@) {
 182         my $srcfile=shift;
 183         my $destfile=shift;
 184         my $srcfd=shift;
 185         my $destfd=shift;
 186         my $cleanup=shift;
 187
 188         my $blksize = 16384;
 189         my ($len, $buf, $written);
 190         while ($len = sysread $srcfd, $buf, $blksize) {
 191                 if (! defined $len) {
 192                         next if $! =~ /^Interrupted/;
 193                         error("failed to read $srcfile: $!", $cleanup);
 194                 }
 195                 my $offset = 0;
 196                 while ($len) {
 197                         defined($written = syswrite $destfd, $buf, $len, $offset)
 198                                 or error("failed to write $destfile: $!", $cleanup);
 199                         $len -= $written;
 200                         $offset += $written;
 201                 }
 202         }
 203 }
 204
 205 sub render ($) {
 206         my $file=shift;
 207
 208         my $type=pagetype($file);
 209         my $srcfile=srcfile($file);
 210         if (defined $type) {
 211                 my $page=pagename($file);
 212                 delete $depends{$page};
 213                 will_render($page, htmlpage($page), 1);
 214                 return if $type=~/^_/;
 215
 216                 my $content=htmlize($page, $page, $type,
 217                         linkify($page, $page,
 218                         preprocess($page, $page,
 219                         filter($page, $page,
 220                         readfile($srcfile)))));
 221
 222                 my $output=htmlpage($page);
 223                 writefile($output, $config{destdir}, genpage($page, $content));
 224         }
 225         else {
 226                 delete $depends{$file};
 227                 will_render($file, $file, 1);
 228
 229                 if ($config{hardlink}) {
 230                         # only hardlink if owned by same user
 231                         my @stat=stat($srcfile);
 232                         if ($stat[4] == $>) {
 233                                 prep_writefile($file, $config{destdir});
 234                                 unlink($config{destdir}."/".$file);
 235                                 if (link($srcfile, $config{destdir}."/".$file)) {
 236                                         return;
 237                                 }
 238                         }
 239                         # if hardlink fails, fall back to copying
 240                 }
 241
 242                 my $srcfd=readfile($srcfile, 1, 1);
 243                 writefile($file, $config{destdir}, undef, 1, sub {
 244                         fast_file_copy($srcfile, $file, $srcfd, @_);
 245                 });
 246         }
 247 }
 248
 249 sub prune ($) {
 250         my $file=shift;
 251
 252         unlink($file);
 253         my $dir=dirname($file);
 254         while (rmdir($dir)) {
 255                 $dir=dirname($dir);
 256         }
 257 }
 258
 259 sub srcdir_check () {
 260         # security check, avoid following symlinks in the srcdir path by default
 261         my $test=$config{srcdir};
 262         while (length $test) {
 263                 if (-l $test && ! $config{allow_symlinks_before_srcdir}) {
 264                         error(sprintf(gettext("symlink found in srcdir path (%s) -- set allow_symlinks_before_srcdir to allow this"), $test));
 265                 }
 266                 unless ($test=~s/\/+$//) {
 267                         $test=dirname($test);
 268                 }
 269         }
 270
 271 }
 272
 273 sub find_src_files () {
 274         my (@files, %pages);
 275         eval q{use File::Find};
 276         error($@) if $@;
 277         find({
 278                 no_chdir => 1,
 279                 wanted => sub {
 280                         $_=decode_utf8($_);
 281                         if (file_pruned($_, $config{srcdir})) {
 282                                 $File::Find::prune=1;
 283                         }
 284                         elsif (! -l $_ && ! -d _) {
 285                                 my ($f)=/$config{wiki_file_regexp}/; # untaint
 286                                 if (! defined $f) {
 287                                         warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
 288                                 }
 289                                 else {
 290                                         $f=~s/^\Q$config{srcdir}\E\/?//;
 291                                         push @files, $f;
 292                                         my $pagename = pagename($f);
 293                                         if ($pages{$pagename}) {
 294                                                 debug(sprintf(gettext("%s has multiple possible source pages"), $pagename));
 295                                         }
 296                                         $pages{$pagename}=1;
 297                                 }
 298                         }
 299                 },
 300         }, $config{srcdir});
 301         foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
 302                 find({
 303                         no_chdir => 1,
 304                         wanted => sub {
 305                                 $_=decode_utf8($_);
 306                                 if (file_pruned($_, $dir)) {
 307                                         $File::Find::prune=1;
 308                                 }
 309                                 elsif (! -l $_ && ! -d _) {
 310                                         my ($f)=/$config{wiki_file_regexp}/; # untaint
 311                                         if (! defined $f) {
 312                                                 warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
 313                                         }
 314                                         else {
 315                                                 $f=~s/^\Q$dir\E\/?//;
 316                                                 # avoid underlaydir
 317                                                 # override attacks; see
 318                                                 # security.mdwn
 319                                                 if (! -l "$config{srcdir}/$f" &&
 320                                                     ! -e _) {
 321                                                         my $page=pagename($f);
 322                                                         if (! $pages{$page}) {
 323                                                                 push @files, $f;
 324                                                                 $pages{$page}=1;
 325                                                         }
 326                                                 }
 327                                         }
 328                                 }
 329                         },
 330                 }, $dir);
 331         };
 332
 333         # Returns a list of all source files found, and a hash of
 334         # the corresponding page names.
 335         return \@files, \%pages;
 336 }
 337
 338 sub refresh () {
 339         srcdir_check();
 340         run_hooks(refresh => sub { shift->() });
 341         my ($files, $exists)=find_src_files();
 342
 343         my (%rendered, @add, @del, @internal);
 344         # check for added or removed pages
 345         foreach my $file (@$files) {
 346                 my $page=pagename($file);
 347                 if (exists $pagesources{$page} && $pagesources{$page} ne $file) {
 348                         # the page has changed its type
 349                         $forcerebuild{$page}=1;
 350                 }
 351                 $pagesources{$page}=$file;
 352                 if (! $pagemtime{$page}) {
 353                         if (isinternal($page)) {
 354                                 push @internal, $file;
 355                         }
 356                         else {
 357                                 push @add, $file;
 358                                 if ($config{getctime} && -e "$config{srcdir}/$file") {
 359                                         eval {
 360                                                 my $time=rcs_getctime("$config{srcdir}/$file");
 361                                                 $pagectime{$page}=$time;
 362                                         };
 363                                         if ($@) {
 364                                                 print STDERR $@;
 365                                         }
 366                                 }
 367                         }
 368                         $pagecase{lc $page}=$page;
 369                         if (! exists $pagectime{$page}) {
 370                                 $pagectime{$page}=(srcfile_stat($file))[10];
 371                         }
 372                 }
 373         }
 374         foreach my $page (keys %pagemtime) {
 375                 if (! $exists->{$page}) {
 376                         if (isinternal($page)) {
 377                                 push @internal, $pagesources{$page};
 378                         }
 379                         else {
 380                                 debug(sprintf(gettext("removing old page %s"), $page));
 381                                 push @del, $pagesources{$page};
 382                         }
 383                         $links{$page}=[];
 384                         $renderedfiles{$page}=[];
 385                         $pagemtime{$page}=0;
 386                         foreach my $old (@{$oldrenderedfiles{$page}}) {
 387                                 prune($config{destdir}."/".$old);
 388                         }
 389                         delete $pagesources{$page};
 390                         foreach my $source (keys %destsources) {
 391                                 if ($destsources{$source} eq $page) {
 392                                         delete $destsources{$source};
 393                                 }
 394                         }
 395                 }
 396         }
 397
 398         # find changed and new files
 399         my @needsbuild;
 400         foreach my $file (@$files) {
 401                 my $page=pagename($file);
 402                 my ($srcfile, @stat)=srcfile_stat($file);
 403                 if (! exists $pagemtime{$page} ||
 404                     $stat[9] > $pagemtime{$page} ||
 405                     $forcerebuild{$page}) {
 406                         $pagemtime{$page}=$stat[9];
 407                         if (isinternal($page)) {
 408                                 push @internal, $file;
 409                                 # Preprocess internal page in scan-only mode.
 410                                 preprocess($page, $page, readfile($srcfile), 1);
 411                         }
 412                         else {
 413                                 push @needsbuild, $file;
 414                         }
 415                 }
 416         }
 417         run_hooks(needsbuild => sub { shift->(\@needsbuild) });
 418
 419         # scan and render files
 420         foreach my $file (@needsbuild) {
 421                 debug(sprintf(gettext("scanning %s"), $file));
 422                 scan($file);
 423         }
 424         calculate_links();
 425         foreach my $file (@needsbuild) {
 426                 debug(sprintf(gettext("building %s"), $file));
 427                 render($file);
 428                 $rendered{$file}=1;
 429         }
 430         foreach my $file (@internal) {
 431                 # internal pages are not rendered
 432                 my $page=pagename($file);
 433                 delete $depends{$page};
 434                 foreach my $old (@{$renderedfiles{$page}}) {
 435                         delete $destsources{$old};
 436                 }
 437                 $renderedfiles{$page}=[];
 438         }
 439
 440         # rebuild pages that link to added or removed pages
 441         if (@add || @del) {
 442                 foreach my $f (@add, @del) {
 443                         my $p=pagename($f);
 444                         foreach my $page (keys %{$backlinks{$p}}) {
 445                                 my $file=$pagesources{$page};
 446                                 next if $rendered{$file};
 447                                 debug(sprintf(gettext("building %s, which links to %s"), $file, $p));
 448                                 render($file);
 449                                 $rendered{$file}=1;
 450                         }
 451                 }
 452         }
 453
 454         if (%rendered || @del || @internal) {
 455                 my @changed=(keys %rendered, @del);
 456
 457                 # rebuild dependant pages
 458                 F: foreach my $f (@$files) {
 459                         next if $rendered{$f};
 460                         my $p=pagename($f);
 461                         if (exists $depends{$p}) {
 462                                 foreach my $d (keys %{$depends{$p}}) {
 463                                         my $sub=pagespec_translate($d);
 464                                         next if $@ || ! defined $sub;
 465
 466                                         # only consider internal files
 467                                         # if the page explicitly depends
 468                                         # on such files
 469                                         foreach my $file (@changed, $d =~ /internal\(/ ? @internal : ()) {
 470                                                 next if $file eq $f;
 471                                                 my $page=pagename($file);
 472                                                 if ($sub->($page, location => $p)) {
 473                                                         debug(sprintf(gettext("building %s, which depends on %s"), $f, $page));
 474                                                         render($f);
 475                                                         $rendered{$f}=1;
 476                                                         next F;
 477                                                 }
 478                                         }
 479                                 }
 480                         }
 481                 }
 482
 483                 # handle backlinks; if a page has added/removed links,
 484                 # update the pages it links to
 485                 my %linkchanged;
 486                 foreach my $file (@changed) {
 487                         my $page=pagename($file);
 488
 489                         if (exists $links{$page}) {
 490                                 foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
 491                                         if (length $link &&
 492                                             (! exists $oldlinks{$page} ||
 493                                              ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {
 494                                                 $linkchanged{$link}=1;
 495                                         }
 496                                 }
 497                         }
 498                         if (exists $oldlinks{$page}) {
 499                                 foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
 500                                         if (length $link &&
 501                                             (! exists $links{$page} ||
 502                                              ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {
 503                                                 $linkchanged{$link}=1;
 504                                         }
 505                                 }
 506                         }
 507                 }
 508
 509                 foreach my $link (keys %linkchanged) {
 510                         my $linkfile=$pagesources{$link};
 511                         if (defined $linkfile) {
 512                                 next if $rendered{$linkfile};
 513                                 debug(sprintf(gettext("building %s, to update its backlinks"), $linkfile));
 514                                 render($linkfile);
 515                                 $rendered{$linkfile}=1;
 516                         }
 517                 }
 518         }
 519
 520         # remove no longer rendered files
 521         foreach my $src (keys %rendered) {
 522                 my $page=pagename($src);
 523                 foreach my $file (@{$oldrenderedfiles{$page}}) {
 524                         if (! grep { $_ eq $file } @{$renderedfiles{$page}}) {
 525                                 debug(sprintf(gettext("removing %s, no longer built by %s"), $file, $page));
 526                                 prune($config{destdir}."/".$file);
 527                         }
 528                 }
 529         }
 530
 531         if (@del) {
 532                 run_hooks(delete => sub { shift->(@del) });
 533         }
 534         if (%rendered) {
 535                 run_hooks(change => sub { shift->(keys %rendered) });
 536         }
 537 }
 538
 539 sub commandline_render () {
 540         lockwiki();
 541         loadindex();
 542         unlockwiki();
 543
 544         my $srcfile=possibly_foolish_untaint($config{render});
 545         my $file=$srcfile;
 546         $file=~s/\Q$config{srcdir}\E\/?//;
 547
 548         my $type=pagetype($file);
 549         die sprintf(gettext("ikiwiki: cannot build %s"), $srcfile)."\n" unless defined $type;
 550         my $content=readfile($srcfile);
 551         my $page=pagename($file);
 552         $pagesources{$page}=$file;
 553         $content=filter($page, $page, $content);
 554         $content=preprocess($page, $page, $content);
 555         $content=linkify($page, $page, $content);
 556         $content=htmlize($page, $page, $type, $content);
 557         $pagemtime{$page}=(stat($srcfile))[9];
 558         $pagectime{$page}=$pagemtime{$page} if ! exists $pagectime{$page};
 559
 560         print genpage($page, $content);
 561         exit 0;
 562 }
 563
 564 1