Optimize away most expensive file prune calls, when refreshing

[git.ikiwiki.info.git] / IkiWiki / Render.pm

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index 98c86bac8b5d4d87b76de9252e1955f8dff4fd80..a8236b954fbbc334696542e1e61f17ff6f617bc6 100644 (file)
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -1,185 +1,254 @@
+#!/usr/bin/perl
+

 package IkiWiki;
 
 use warnings;
 use strict;
 package IkiWiki;
 
 use warnings;
 use strict;

-use File::Spec;
+use IkiWiki;
+use Encode;

 
 

-sub linkify ($$) { #{{{
-       my $content=shift;
-       my $page=shift;
-
-       $content =~ s{(\\?)$config{wiki_link_regexp}}{
-               $1 ? "[[$2]]" : htmllink($page, $2)
-       }eg;
-       
-       return $content;
-} #}}}
+my %backlinks;
+our %brokenlinks;
+my $links_calculated=0;

 
 

-sub htmlize ($$) { #{{{
-       my $type=shift;
-       my $content=shift;
-       
-       if (! $INC{"/usr/bin/markdown"}) {
-               no warnings 'once';
-               $blosxom::version="is a proper perl module too much to ask?";
-               use warnings 'all';
-               do "/usr/bin/markdown";
-       }
-       
-       if ($type eq '.mdwn') {
-               return Markdown::Markdown($content);
-       }
-       else {
-               error("htmlization of $type not supported");
+sub calculate_links () {
+       return if $links_calculated;
+       %backlinks=%brokenlinks=();
+       foreach my $page (keys %links) {
+               foreach my $link (@{$links{$page}}) {
+                       my $bestlink=bestlink($page, $link);
+                       if (length $bestlink) {
+                               $backlinks{$bestlink}{$page}=1
+                                       if $bestlink ne $page;
+                       }
+                       else {
+                               push @{$brokenlinks{$link}}, $page;
+                       }
+               }

        }
        }

-} #}}}
+       $links_calculated=1;
+}

 
 

-sub backlinks ($) { #{{{
+sub backlink_pages ($) {

        my $page=shift;
 
        my $page=shift;
 

-       my @links;
-       foreach my $p (keys %links) {
-               next if bestlink($page, $p) eq $page;
-               if (grep { length $_ && bestlink($p, $_) eq $page } @{$links{$p}}) {
-                       my $href=File::Spec->abs2rel(htmlpage($p), dirname($page));
-                       
-                       # Trim common dir prefixes from both pages.
-                       my $p_trimmed=$p;
-                       my $page_trimmed=$page;
-                       my $dir;
-                       1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
-                               defined $dir &&
-                               $p_trimmed=~s/^\Q$dir\E// &&
-                               $page_trimmed=~s/^\Q$dir\E//;
-                                      
-                       push @links, { url => $href, page => $p_trimmed };
-               }
-       }
+       calculate_links();

 
 

-       return sort { $a->{page} cmp $b->{page} } @links;
-} #}}}
+       return keys %{$backlinks{$page}};
+}

 
 

-sub parentlinks ($) { #{{{
+sub backlinks ($) {

        my $page=shift;
        my $page=shift;

-       
-       my @ret;
-       my $pagelink="";
-       my $path="";
-       my $skip=1;
-       foreach my $dir (reverse split("/", $page)) {
-               if (! $skip) {
-                       $path.="../";
-                       unshift @ret, { url => "$path$dir.html", page => $dir };
-               }
-               else {
-                       $skip=0;
-               }
+
+       my @links;
+       foreach my $p (backlink_pages($page)) {
+               my $href=urlto($p, $page);
+                
+               # Trim common dir prefixes from both pages.
+               my $p_trimmed=$p;
+               my $page_trimmed=$page;
+               my $dir;
+               1 while (($dir)=$page_trimmed=~m!^([^/]+/)!) &&
+                       defined $dir &&
+                       $p_trimmed=~s/^\Q$dir\E// &&
+                       $page_trimmed=~s/^\Q$dir\E//;
+                              
+               push @links, { url => $href, page => pagetitle($p_trimmed) };

        }
        }

-       unshift @ret, { url => length $path ? $path : ".", page => $config{wikiname} };
-       return @ret;
-} #}}}
+       return @links;
+}

 
 

-sub finalize ($$$) { #{{{
-       my $content=shift;
+sub genpage ($$) {

        my $page=shift;
        my $page=shift;

-       my $mtime=shift;
+       my $content=shift;

 
 

-       my $title=basename($page);
-       $title=~s/_/ /g;
-       
-       my $template=HTML::Template->new(blind_cache => 1,
-               filename => "$config{templatedir}/page.tmpl");
-       
-       if (length $config{cgiurl}) {
-               $template->param(editurl => "$config{cgiurl}?do=edit&page=$page");
-               $template->param(prefsurl => "$config{cgiurl}?do=prefs");
-               if ($config{rcs}) {
-                       $template->param(recentchangesurl => "$config{cgiurl}?do=recentchanges");
+       my $templatefile;
+       run_hooks(templatefile => sub {
+               return if defined $templatefile;
+               my $file=shift->(page => $page);
+               if (defined $file && defined template_file($file)) {
+                       $templatefile=$file;

                }
                }

-       }
+       });
+       my $template=template(defined $templatefile ? $templatefile : 'page.tmpl', blind_cache => 1);
+       my $actions=0;

 
 

-       if (length $config{historyurl}) {
+       if (length $config{cgiurl}) {
+               $template->param(editurl => cgiurl(do => "edit", page => $page))
+                       if IkiWiki->can("cgi_editpage");
+               $template->param(prefsurl => cgiurl(do => "prefs"))
+                       if exists $hooks{auth};
+               $actions++;
+       }
+               
+       if (defined $config{historyurl} && length $config{historyurl}) {

                my $u=$config{historyurl};
                $u=~s/\[\[file\]\]/$pagesources{$page}/g;
                $template->param(historyurl => $u);
                my $u=$config{historyurl};
                $u=~s/\[\[file\]\]/$pagesources{$page}/g;
                $template->param(historyurl => $u);

+               $actions++;

        }
        }

-       
+       if ($config{discussion}) {
+               if ($page !~ /.*\/\Q$config{discussionpage}\E$/ &&
+                  (length $config{cgiurl} ||
+                   exists $links{$page."/".$config{discussionpage}})) {
+                       $template->param(discussionlink => htmllink($page, $page, $config{discussionpage}, noimageinline => 1, forcesubpage => 1));
+                       $actions++;
+               }
+       }
+
+       if ($actions) {
+               $template->param(have_actions => 1);
+       }
+
+       my @backlinks=sort { $a->{page} cmp $b->{page} } backlinks($page);
+       my ($backlinks, $more_backlinks);
+       if (@backlinks <= $config{numbacklinks} || ! $config{numbacklinks}) {
+               $backlinks=\@backlinks;
+               $more_backlinks=[];
+       }
+       else {
+               $backlinks=[@backlinks[0..$config{numbacklinks}-1]];
+               $more_backlinks=[@backlinks[$config{numbacklinks}..$#backlinks]];
+       }
+

        $template->param(
        $template->param(

-               title => $title,
+               title => $page eq 'index' 
+                       ? $config{wikiname} 
+                       : pagetitle(basename($page)),

                wikiname => $config{wikiname},
                wikiname => $config{wikiname},

-               parentlinks => [parentlinks($page)],

                content => $content,
                content => $content,

-               backlinks => [backlinks($page)],
-               discussionlink => htmllink($page, "Discussion", 1, 1),
-               mtime => scalar(gmtime($mtime)),
+               backlinks => $backlinks,
+               more_backlinks => $more_backlinks,
+               mtime => displaytime($pagemtime{$page}),
+               ctime => displaytime($pagectime{$page}),
+               baseurl => baseurl($page),

        );
        );

+
+       run_hooks(pagetemplate => sub {
+               shift->(page => $page, destpage => $page, template => $template);
+       });

        
        

-       return $template->output;
-} #}}}
-
-sub check_overwrite ($$) { #{{{
-       # Important security check. Make sure to call this before saving
-       # any files to the source directory.
-       my $dest=shift;
-       my $src=shift;
+       $content=$template->output;

        
        

-       if (! exists $renderedfiles{$src} && -e $dest && ! $config{rebuild}) {
-               error("$dest already exists and was rendered from ".
-                       join(" ",(grep { $renderedfiles{$_} eq $dest } keys
-                               %renderedfiles)).
-                       ", before, so not rendering from $src");
-       }
-} #}}}
+       run_hooks(postscan => sub {
+               shift->(page => $page, content => $content);
+       });

 
 

-sub mtime ($) { #{{{
-       my $page=shift;
-       
-       return (stat($page))[9];
-} #}}}
+       run_hooks(format => sub {
+               $content=shift->(
+                       page => $page,
+                       content => $content,
+               );
+       });

 
 

-sub findlinks ($$) { #{{{
-       my $content=shift;
-       my $page=shift;
+       return $content;
+}

 
 

-       my @links;
-       while ($content =~ /(?<!\\)$config{wiki_link_regexp}/g) {
-               push @links, lc($1);
+sub scan ($) {
+       my $file=shift;
+
+       my $type=pagetype($file);
+       if (defined $type) {
+               my $srcfile=srcfile($file);
+               my $content=readfile($srcfile);
+               my $page=pagename($file);
+               will_render($page, htmlpage($page), 1);
+
+               if ($config{discussion}) {
+                       # Discussion links are a special case since they're
+                       # not in the text of the page, but on its template.
+                       $links{$page}=[ $page."/".lc($config{discussionpage}) ];
+               }
+               else {
+                       $links{$page}=[];
+               }
+
+               run_hooks(scan => sub {
+                       shift->(
+                               page => $page,
+                               content => $content,
+                       );
+               });
+
+               # Preprocess in scan-only mode.
+               preprocess($page, $page, $content, 1);
+       }
+       else {
+               will_render($file, $file, 1);

        }
        }

-       # Discussion links are a special case since they're not in the text
-       # of the page, but on its template.
-       return @links, "$page/discussion";
-} #}}}
+}

 
 

-sub render ($) { #{{{
+sub fast_file_copy (@) {
+       my $srcfile=shift;
+       my $destfile=shift;
+       my $srcfd=shift;
+       my $destfd=shift;
+       my $cleanup=shift;
+
+       my $blksize = 16384;
+       my ($len, $buf, $written);
+       while ($len = sysread $srcfd, $buf, $blksize) {
+               if (! defined $len) {
+                       next if $! =~ /^Interrupted/;
+                       error("failed to read $srcfile: $!", $cleanup);
+               }
+               my $offset = 0;
+               while ($len) {
+                       defined($written = syswrite $destfd, $buf, $len, $offset)
+                               or error("failed to write $destfile: $!", $cleanup);
+                       $len -= $written;
+                       $offset += $written;
+               }
+       }
+}
+
+sub render ($) {

        my $file=shift;
        
        my $type=pagetype($file);
        my $file=shift;
        
        my $type=pagetype($file);

-       my $content=readfile("$config{srcdir}/$file");
-       if ($type ne 'unknown') {
+       my $srcfile=srcfile($file);
+       if (defined $type) {

                my $page=pagename($file);
                my $page=pagename($file);

+               delete $depends{$page};
+               delete $depends_simple{$page};
+               will_render($page, htmlpage($page), 1);
+               return if $type=~/^_/;

                
                

-               $links{$page}=[findlinks($content, $page)];
+               my $content=htmlize($page, $page, $type,
+                       linkify($page, $page,
+                       preprocess($page, $page,
+                       filter($page, $page,
+                       readfile($srcfile)))));

                
                

-               $content=linkify($content, $page);
-               $content=htmlize($type, $content);
-               $content=finalize($content, $page,
-                       mtime("$config{srcdir}/$file"));
-               
-               check_overwrite("$config{destdir}/".htmlpage($page), $page);
-               writefile("$config{destdir}/".htmlpage($page), $content);
-               $oldpagemtime{$page}=time;
-               $renderedfiles{$page}=htmlpage($page);
+               my $output=htmlpage($page);
+               writefile($output, $config{destdir}, genpage($page, $content));

        }
        else {
        }
        else {

-               $links{$file}=[];
-               check_overwrite("$config{destdir}/$file", $file);
-               writefile("$config{destdir}/$file", $content);
-               $oldpagemtime{$file}=time;
-               $renderedfiles{$file}=$file;
+               delete $depends{$file};
+               delete $depends_simple{$file};
+               will_render($file, $file, 1);
+               
+               if ($config{hardlink}) {
+                       # only hardlink if owned by same user
+                       my @stat=stat($srcfile);
+                       if ($stat[4] == $>) {
+                               prep_writefile($file, $config{destdir});
+                               unlink($config{destdir}."/".$file);
+                               if (link($srcfile, $config{destdir}."/".$file)) {
+                                       return;
+                               }
+                       }
+                       # if hardlink fails, fall back to copying
+               }
+               
+               my $srcfd=readfile($srcfile, 1, 1);
+               writefile($file, $config{destdir}, undef, 1, sub {
+                       fast_file_copy($srcfile, $file, $srcfd, @_);
+               });

        }
        }

-} #}}}
+}

 
 

-sub prune ($) { #{{{
+sub prune ($) {

        my $file=shift;
 
        unlink($file);
        my $file=shift;
 
        unlink($file);


@@ -187,108 +256,264 @@ sub prune ($) { #{{{
        while (rmdir($dir)) {
                $dir=dirname($dir);
        }
        while (rmdir($dir)) {
                $dir=dirname($dir);
        }

-} #}}}
+}

 
 

-sub refresh () { #{{{
-       # find existing pages
-       my %exists;
-       my @files;
+sub srcdir_check () {
+       # security check, avoid following symlinks in the srcdir path by default
+       my $test=$config{srcdir};
+       while (length $test) {
+               if (-l $test && ! $config{allow_symlinks_before_srcdir}) {
+                       error(sprintf(gettext("symlink found in srcdir path (%s) -- set allow_symlinks_before_srcdir to allow this"), $test));
+               }
+               unless ($test=~s/\/+$//) {
+                       $test=dirname($test);
+               }
+       }
+       
+}
+
+sub find_src_files () {
+       my (@files, %pages);

        eval q{use File::Find};
        eval q{use File::Find};

+       error($@) if $@;

        find({
                no_chdir => 1,
                wanted => sub {
        find({
                no_chdir => 1,
                wanted => sub {

-                       if (/$config{wiki_file_prune_regexp}/) {
-                               no warnings 'once';
+                       my $file=decode_utf8($_);
+                       $file=~s/^\Q$config{srcdir}\E\/?//;
+                       my $page = pagename($file);
+                       if (! exists $pagesources{$page} &&
+                           file_pruned($file)) {

                                $File::Find::prune=1;
                                $File::Find::prune=1;

-                               use warnings "all";
+                               return;

                        }
                        }

-                       elsif (! -d $_ && ! -l $_) {
-                               my ($f)=/$config{wiki_file_regexp}/; # untaint
-                               if (! defined $f) {
-                                       warn("skipping bad filename $_\n");
-                               }
-                               else {
-                                       $f=~s/^\Q$config{srcdir}\E\/?//;
-                                       push @files, $f;
-                                       $exists{pagename($f)}=1;
+                       return if -l $_ || -d _ || ! length $file;
+
+                       my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
+                       if (! defined $f) {
+                               warn(sprintf(gettext("skipping bad filename %s"), $file)."\n");
+                       }
+                       else {
+                               push @files, $f;
+                               if ($pages{$page}) {
+                                       debug(sprintf(gettext("%s has multiple possible source pages"), $page));

                                }
                                }

+                               $pages{$page}=1;

                        }
                },
        }, $config{srcdir});
                        }
                },
        }, $config{srcdir});

+       foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
+               find({
+                       no_chdir => 1,
+                       wanted => sub {
+                               my $file=decode_utf8($_);
+                               $file=~s/^\Q$dir\E\/?//;
+                               my $page=pagename($file);
+                               if (! exists $pagesources{$page} &&
+                                   file_pruned($file)) {
+                                       $File::Find::prune=1;
+                                       return;
+                               }
+                               return if -l $_ || -d _ || ! length $file;

 
 

-       my %rendered;
+                               my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
+                               if (! defined $f) {
+                                       warn(sprintf(gettext("skipping bad filename %s"), $file)."\n");
+                               }
+                               else {
+                                       # avoid underlaydir override
+                                       # attacks; see security.mdwn
+                                       if (! -l "$config{srcdir}/$f" && 
+                                           ! -e _) {
+                                               if (! $pages{$page}) {
+                                                       push @files, $f;
+                                                       $pages{$page}=1;
+                                               }
+                                       }
+                               }
+                       },
+               }, $dir);
+       };
+
+       # Returns a list of all source files found, and a hash of 
+       # the corresponding page names.
+       return \@files, \%pages;
+}

 
 

+sub refresh () {
+       srcdir_check();
+       run_hooks(refresh => sub { shift->() });
+       my ($files, $exists)=find_src_files();
+
+       my (%rendered, @add, @del, @internal);

        # check for added or removed pages
        # check for added or removed pages

-       my @add;
-       foreach my $file (@files) {
+       foreach my $file (@$files) {

                my $page=pagename($file);
                my $page=pagename($file);

-               if (! $oldpagemtime{$page}) {
-                       debug("new page $page");
-                       push @add, $file;
-                       $links{$page}=[];
-                       $pagesources{$page}=$file;
+               if (exists $pagesources{$page} && $pagesources{$page} ne $file) {
+                       # the page has changed its type
+                       $forcerebuild{$page}=1;
+               }
+               $pagesources{$page}=$file;
+               if (! $pagemtime{$page}) {
+                       if (isinternal($page)) {
+                               push @internal, $file;
+                       }
+                       else {
+                               push @add, $file;
+                               if ($config{getctime} && -e "$config{srcdir}/$file") {
+                                       eval {
+                                               my $time=rcs_getctime("$config{srcdir}/$file");
+                                               $pagectime{$page}=$time;
+                                       };
+                                       if ($@) {
+                                               print STDERR $@;
+                                       }
+                               }
+                       }
+                       $pagecase{lc $page}=$page;
+                       if (! exists $pagectime{$page}) {
+                               $pagectime{$page}=(srcfile_stat($file))[10];
+                       }

                }
        }
                }
        }

-       my @del;
-       foreach my $page (keys %oldpagemtime) {
-               if (! $exists{$page}) {
-                       debug("removing old page $page");
-                       push @del, $pagesources{$page};
-                       prune($config{destdir}."/".$renderedfiles{$page});
-                       delete $renderedfiles{$page};
-                       $oldpagemtime{$page}=0;
+       foreach my $page (keys %pagemtime) {
+               if (! $exists->{$page}) {
+                       if (isinternal($page)) {
+                               push @internal, $pagesources{$page};
+                       }
+                       else {
+                               debug(sprintf(gettext("removing old page %s"), $page));
+                               push @del, $pagesources{$page};
+                       }
+                       $links{$page}=[];
+                       $renderedfiles{$page}=[];
+                       $pagemtime{$page}=0;
+                       foreach my $old (@{$oldrenderedfiles{$page}}) {
+                               prune($config{destdir}."/".$old);
+                       }

                        delete $pagesources{$page};
                        delete $pagesources{$page};

+                       foreach my $source (keys %destsources) {
+                               if ($destsources{$source} eq $page) {
+                                       delete $destsources{$source};
+                               }
+                       }

                }
        }
                }
        }

-       
-       # render any updated files
-       foreach my $file (@files) {
+
+       # find changed and new files
+       my @needsbuild;
+       foreach my $file (@$files) {

                my $page=pagename($file);
                my $page=pagename($file);

-               
-               if (! exists $oldpagemtime{$page} ||
-                   mtime("$config{srcdir}/$file") > $oldpagemtime{$page}) {
-                       debug("rendering changed file $file");
-                       render($file);
-                       $rendered{$file}=1;
+               my ($srcfile, @stat)=srcfile_stat($file);
+               if (! exists $pagemtime{$page} ||
+                   $stat[9] > $pagemtime{$page} ||
+                   $forcerebuild{$page}) {
+                       $pagemtime{$page}=$stat[9];
+                       if (isinternal($page)) {
+                               push @internal, $file;
+                               # Preprocess internal page in scan-only mode.
+                               preprocess($page, $page, readfile($srcfile), 1);
+                       }
+                       else {
+                               push @needsbuild, $file;
+                       }

                }
        }
                }
        }

+       run_hooks(needsbuild => sub { shift->(\@needsbuild) });
+
+       # scan and render files
+       foreach my $file (@needsbuild) {
+               debug(sprintf(gettext("scanning %s"), $file));
+               scan($file);
+       }
+       calculate_links();
+       foreach my $file (@needsbuild) {
+               debug(sprintf(gettext("building %s"), $file));
+               render($file);
+               $rendered{$file}=1;
+       }
+       foreach my $file (@internal) {
+               # internal pages are not rendered
+               my $page=pagename($file);
+               delete $depends{$page};
+               delete $depends_simple{$page};
+               foreach my $old (@{$renderedfiles{$page}}) {
+                       delete $destsources{$old};
+               }
+               $renderedfiles{$page}=[];
+       }

        
        

-       # if any files were added or removed, check to see if each page
-       # needs an update due to linking to them
-       # TODO: inefficient; pages may get rendered above and again here;
-       # problem is the bestlink may have changed and we won't know until
-       # now
+       # rebuild pages that link to added or removed pages

        if (@add || @del) {
        if (@add || @del) {

-FILE:          foreach my $file (@files) {
-                       my $page=pagename($file);
-                       foreach my $f (@add, @del) {
-                               my $p=pagename($f);
-                               foreach my $link (@{$links{$page}}) {
-                                       if (bestlink($page, $link) eq $p) {
-                                               debug("rendering $file, which links to $p");
-                                               render($file);
-                                               $rendered{$file}=1;
-                                               next FILE;
-                                       }
-                               }
+               foreach my $f (@add, @del) {
+                       my $p=pagename($f);
+                       foreach my $page (keys %{$backlinks{$p}}) {
+                               my $file=$pagesources{$page};
+                               next if $rendered{$file};
+                               debug(sprintf(gettext("building %s, which links to %s"), $file, $p));
+                               render($file);
+                               $rendered{$file}=1;

                        }
                }
        }
 
                        }
                }
        }
 

-       # handle backlinks; if a page has added/removed links, update the
-       # pages it links to
-       # TODO: inefficient; pages may get rendered above and again here;
-       # problem is the backlinks could be wrong in the first pass render
-       # above
-       if (%rendered) {
+       if (%rendered || @del || @internal) {
+               my @changed=(keys %rendered, @del);
+
+               my %lcchanged = map { lc(pagename($_)) => 1 } @changed;
+ 
+               # rebuild dependant pages
+               foreach my $f (@$files) {
+                       next if $rendered{$f};
+                       my $p=pagename($f);
+                       my $reason = undef;
+
+                       if (exists $depends_simple{$p}) {
+                               foreach my $d (keys %{$depends_simple{$p}}) {
+                                       if (exists $lcchanged{$d}) {
+                                               $reason = $d;
+                                               last;
+                                       }
+                               }
+                       }
+
+                       if (exists $depends{$p} && ! defined $reason) {
+                               D: foreach my $d (keys %{$depends{$p}}) {
+                                       my $sub=pagespec_translate($d);
+                                       next if $@ || ! defined $sub;
+
+                                       # only consider internal files
+                                       # if the page explicitly depends
+                                       # on such files
+                                       foreach my $file (@changed, $d =~ /internal\(/ ? @internal : ()) {
+                                               next if $file eq $f;
+                                               my $page=pagename($file);
+                                               if ($sub->($page, location => $p)) {
+                                                       $reason = $page;
+                                                       last D;
+                                               }
+                                       }
+                               }
+                       }
+
+                       if (defined $reason) {
+                               debug(sprintf(gettext("building %s, which depends on %s"), $f, $reason));
+                               render($f);
+                               $rendered{$f}=1;
+                       }
+               }
+               
+               # handle backlinks; if a page has added/removed links,
+               # update the pages it links to

                my %linkchanged;
                my %linkchanged;

-               foreach my $file (keys %rendered, @del) {
+               foreach my $file (@changed) {

                        my $page=pagename($file);
                        my $page=pagename($file);

+                       

                        if (exists $links{$page}) {
                                foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
                                        if (length $link &&
                        if (exists $links{$page}) {
                                foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
                                        if (length $link &&

-                                           ! exists $oldlinks{$page} ||
-                                           ! grep { $_ eq $link } @{$oldlinks{$page}}) {
+                                           (! exists $oldlinks{$page} ||
+                                            ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {

                                                $linkchanged{$link}=1;
                                        }
                                }
                                                $linkchanged{$link}=1;
                                        }
                                }


@@ -296,21 +521,67 @@ FILE:             foreach my $file (@files) {
                        if (exists $oldlinks{$page}) {
                                foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
                                        if (length $link &&
                        if (exists $oldlinks{$page}) {
                                foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
                                        if (length $link &&

-                                           ! exists $links{$page} ||
-                                           ! grep { $_ eq $link } @{$links{$page}}) {
+                                           (! exists $links{$page} || 
+                                            ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {

                                                $linkchanged{$link}=1;
                                        }
                                }
                        }
                }
                                                $linkchanged{$link}=1;
                                        }
                                }
                        }
                }

+

                foreach my $link (keys %linkchanged) {
                        my $linkfile=$pagesources{$link};
                        if (defined $linkfile) {
                foreach my $link (keys %linkchanged) {
                        my $linkfile=$pagesources{$link};
                        if (defined $linkfile) {

-                               debug("rendering $linkfile, to update its backlinks");
+                               next if $rendered{$linkfile};
+                               debug(sprintf(gettext("building %s, to update its backlinks"), $linkfile));

                                render($linkfile);
                                render($linkfile);

+                               $rendered{$linkfile}=1;
+                       }
+               }
+       }
+
+       # remove no longer rendered files
+       foreach my $src (keys %rendered) {
+               my $page=pagename($src);
+               foreach my $file (@{$oldrenderedfiles{$page}}) {
+                       if (! grep { $_ eq $file } @{$renderedfiles{$page}}) {
+                               debug(sprintf(gettext("removing %s, no longer built by %s"), $file, $page));
+                               prune($config{destdir}."/".$file);

                        }
                }
        }
                        }
                }
        }

-} #}}}
+
+       if (@del) {
+               run_hooks(delete => sub { shift->(@del) });
+       }
+       if (%rendered) {
+               run_hooks(change => sub { shift->(keys %rendered) });
+       }
+}
+
+sub commandline_render () {
+       lockwiki();
+       loadindex();
+       unlockwiki();
+
+       my $srcfile=possibly_foolish_untaint($config{render});
+       my $file=$srcfile;
+       $file=~s/\Q$config{srcdir}\E\/?//;
+
+       my $type=pagetype($file);
+       die sprintf(gettext("ikiwiki: cannot build %s"), $srcfile)."\n" unless defined $type;
+       my $content=readfile($srcfile);
+       my $page=pagename($file);
+       $pagesources{$page}=$file;
+       $content=filter($page, $page, $content);
+       $content=preprocess($page, $page, $content);
+       $content=linkify($page, $page, $content);
+       $content=htmlize($page, $page, $type, $content);
+       $pagemtime{$page}=(stat($srcfile))[9];
+       $pagectime{$page}=$pagemtime{$page} if ! exists $pagectime{$page};
+
+       print genpage($page, $content);
+       exit 0;
+}

 
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