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