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[git.ikiwiki.info.git] / IkiWiki / Render.pm
diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index e5a1679f8fbf9df3e91c54cb5f973ac3dca2d414..308d60ed0f4931aad93bd23897ba86e8b92e49d0 100644 (file)
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -7,301 +7,253 @@ use strict;
 use IkiWiki;
 use Encode;
 
 use IkiWiki;
 use Encode;
 
-sub linkify ($$$) { #{{{
-       my $lpage=shift;
-       my $page=shift;
-       my $content=shift;
-
-       $content =~ s{(\\?)$config{wiki_link_regexp}}{
-               $2 ? ( $1 ? "[[$2|$3]]" : htmllink($lpage, $page, titlepage($3), 0, 0, pagetitle($2)))
-                  : ( $1 ? "[[$3]]" :    htmllink($lpage, $page, titlepage($3)))
-       }eg;
-       
-       return $content;
-} #}}}
-
-sub htmlize ($$) { #{{{
-       my $type=shift;
-       my $content=shift;
-       
-       if (exists $hooks{htmlize}{$type}) {
-               $content=$hooks{htmlize}{$type}{call}->($content);
-       }
-       else {
-               error("htmlization of $type not supported");
-       }
-
-       if (exists $hooks{sanitize}) {
-               foreach my $id (keys %{$hooks{sanitize}}) {
-                       $content=$hooks{sanitize}{$id}{call}->($content);
+my (%backlinks, %rendered);
+our %brokenlinks;
+my $links_calculated=0;
+
+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;
+                       }
                }
        }
                }
        }
-       
-       return $content;
-} #}}}
+       $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 $href=abs2rel(htmlpage($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;
-       return if $page eq 'index'; # toplevel
-       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 preprocess ($$;$) { #{{{
+sub genpage ($$) {
        my $page=shift;
        my $content=shift;
        my $page=shift;
        my $content=shift;
-       my $onlystrip=shift || 0; # strip directives without processing
-
-       my $handle=sub {
-               my $escape=shift;
-               my $command=shift;
-               my $params=shift;
-               if (length $escape) {
-                       return "[[$command $params]]";
-               }
-               elsif ($onlystrip) {
-                       return "";
-               }
-               elsif (exists $hooks{preprocess}{$command}) {
-                       # Note: preserve order of params, some plugins may
-                       # consider it significant.
-                       my @params;
-                       while ($params =~ /(\w+)=\"?([^"]+)"?(\s+|$)/g) {
-                               push @params, $1, $2;
-                       }
-                       return $hooks{preprocess}{$command}{call}->(@params, page => $page);
-               }
-               else {
-                       return "[[$command not processed]]";
-               }
-       };
        
        
-       $content =~ s{(\\?)$config{wiki_processor_regexp}}{$handle->($1, $2, $3)}eg;
-       return $content;
-} #}}}
-
-sub add_depends ($$) { #{{{
-       my $page=shift;
-       my $globlist=shift;
-       
-       if (! exists $depends{$page}) {
-               $depends{$page}=$globlist;
-       }
-       else {
-               $depends{$page}=globlist_merge($depends{$page}, $globlist);
-       }
-} # }}}
-
-sub globlist_merge ($$) { #{{{
-       my $a=shift;
-       my $b=shift;
-
-       my $ret="";
-       # Only add negated globs if they are not matched by the other globlist.
-       foreach my $i ((map { [ $a, $_ ] } split(" ", $b)), 
-                      (map { [ $b, $_ ] } split(" ", $a))) {
-               if ($i->[1]=~/^!(.*)/) {
-                       if (! globlist_match($1, $i->[0])) {
-                               $ret.=" ".$i->[1];
-                       }
+       run_hooks(postscan => sub {
+               shift->(page => $page, content => $content);
+       });
+
+       my $templatefile;
+       run_hooks(templatefile => sub {
+               return if defined $templatefile;
+               my $file=shift->(page => $page);
+               if (defined $file && defined template_file($file)) {
+                       $templatefile=$file;
                }
                }
-               else {
-                       $ret.=" ".$i->[1];
-               }
-       }
-       
-       return $ret;
-} #}}}
-
-sub genpage ($$$) { #{{{
-       my $page=shift;
-       my $content=shift;
-       my $mtime=shift;
-
-       my $template=template("page.tmpl", blind_cache => 1);
+       });
+       my $template=template(defined $templatefile ? $templatefile : 'page.tmpl', blind_cache => 1);
        my $actions=0;
 
        if (length $config{cgiurl}) {
        my $actions=0;
 
        if (length $config{cgiurl}) {
-               $template->param(editurl => cgiurl(do => "edit", page => $page));
-               $template->param(prefsurl => cgiurl(do => "prefs"));
-               if ($config{rcs}) {
-                       $template->param(recentchangesurl => cgiurl(do => "recentchanges"));
-               }
+               $template->param(editurl => cgiurl(do => "edit", page => $page))
+                       if IkiWiki->can("cgi_editpage");
+               $template->param(prefsurl => cgiurl(do => "prefs"))
+                       if exists $hooks{auth};
                $actions++;
        }
                $actions++;
        }
-
-       if (length $config{historyurl}) {
+               
+       if (defined $config{historyurl} && length $config{historyurl}) {
                my $u=$config{historyurl};
                $u=~s/\[\[file\]\]/$pagesources{$page}/g;
                $template->param(historyurl => $u);
                $actions++;
        }
        if ($config{discussion}) {
                my $u=$config{historyurl};
                $u=~s/\[\[file\]\]/$pagesources{$page}/g;
                $template->param(historyurl => $u);
                $actions++;
        }
        if ($config{discussion}) {
-               $template->param(discussionlink => htmllink($page, $page, "Discussion", 1, 1));
-               $actions++;
+               if ($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);
        }
 
        }
 
        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(
                title => $page eq 'index' 
                        ? $config{wikiname} 
                        : pagetitle(basename($page)),
                wikiname => $config{wikiname},
        $template->param(
                title => $page eq 'index' 
                        ? $config{wikiname} 
                        : pagetitle(basename($page)),
                wikiname => $config{wikiname},
-               parentlinks => [parentlinks($page)],
                content => $content,
                content => $content,
-               backlinks => [backlinks($page)],
-               mtime => displaytime($mtime),
-               styleurl => styleurl($page),
+               backlinks => $backlinks,
+               more_backlinks => $more_backlinks,
+               mtime => displaytime($pagemtime{$page}),
+               ctime => displaytime($pagectime{$page}),
+               baseurl => baseurl($page),
        );
 
        );
 
-       if (exists $hooks{pagetemplate}) {
-               foreach my $id (keys %{$hooks{pagetemplate}}) {
-                       $hooks{pagetemplate}{$id}{call}->($page, $template);
-               }
-       }
+       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 not rendered from $src before");
-       }
-} #}}}
+       run_hooks(format => sub {
+               $content=shift->(
+                       page => $page,
+                       content => $content,
+               );
+       });
 
 
-sub displaytime ($) { #{{{
-       my $time=shift;
-
-       eval q{use POSIX};
-       # strftime doesn't know about encodings, so make sure
-       # its output is properly treated as utf8
-       return decode_utf8(POSIX::strftime(
-                       $config{timeformat}, localtime($time)));
-} #}}}
+       return $content;
+}
 
 
-sub mtime ($) { #{{{
+sub scan ($) {
        my $file=shift;
        my $file=shift;
-       
-       return (stat($file))[9];
-} #}}}
 
 
-sub findlinks ($$) { #{{{
-       my $page=shift;
-       my $content=shift;
+       debug(sprintf(gettext("scanning %s"), $file));
 
 
-       my @links;
-       while ($content =~ /(?<!\\)$config{wiki_link_regexp}/g) {
-               push @links, titlepage($2);
-       }
-       if ($config{discussion}) {
-               # Discussion links are a special case since they're not in the
-               # text of the page, but on its template.
-               return @links, "$page/discussion";
-       }
-       else {
-               return @links;
-       }
-} #}}}
+       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);
 
 
-sub filter ($$) {
-       my $page=shift;
-       my $content=shift;
+               if ($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}=[];
+               }
 
 
-       if (exists $hooks{filter}) {
-               foreach my $id (keys %{$hooks{filter}}) {
-                       $content=$hooks{filter}{$id}{call}->(
+               run_hooks(scan => sub {
+                       shift->(
                                page => $page,
                                page => $page,
-                               content => $content
+                               content => $content,
                        );
                        );
-               }
+               });
+
+               # Preprocess in scan-only mode.
+               preprocess($page, $page, $content, 1);
+       }
+       else {
+               will_render($file, $file, 1);
        }
        }
+}
 
 
-       return $content;
+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 ($) { #{{{
+sub render ($$) {
        my $file=shift;
        my $file=shift;
+       return if $rendered{$file};
+       debug(shift);
+       $rendered{$file}=1;
        
        my $type=pagetype($file);
        my $srcfile=srcfile($file);
        if (defined $type) {
        
        my $type=pagetype($file);
        my $srcfile=srcfile($file);
        if (defined $type) {
-               my $content=readfile($srcfile);
                my $page=pagename($file);
                delete $depends{$page};
                my $page=pagename($file);
                delete $depends{$page};
+               delete $depends_simple{$page};
+               will_render($page, htmlpage($page), 1);
+               return if $type=~/^_/;
                
                
-               $content=filter($page, $content);
-               
-               $links{$page}=[findlinks($page, $content)];
+               my $content=htmlize($page, $page, $type,
+                       linkify($page, $page,
+                       preprocess($page, $page,
+                       filter($page, $page,
+                       readfile($srcfile)))));
                
                
-               $content=linkify($page, $page, $content);
-               $content=preprocess($page, $content);
-               $content=htmlize($type, $content);
-               
-               check_overwrite("$config{destdir}/".htmlpage($page), $page);
-               writefile(htmlpage($page), $config{destdir},
-                       genpage($page, $content, mtime($srcfile)));
-               $oldpagemtime{$page}=time;
-               $renderedfiles{$page}=htmlpage($page);
+               my $output=htmlpage($page);
+               writefile($output, $config{destdir}, genpage($page, $content));
        }
        else {
        }
        else {
-               my $content=readfile($srcfile, 1);
-               $links{$file}=[];
                delete $depends{$file};
                delete $depends{$file};
-               check_overwrite("$config{destdir}/$file", $file);
-               writefile($file, $config{destdir}, $content, 1);
-               $oldpagemtime{$file}=time;
-               $renderedfiles{$file}=$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($file);
@@ -309,189 +261,448 @@ sub prune ($) { #{{{
        while (rmdir($dir)) {
                $dir=dirname($dir);
        }
        while (rmdir($dir)) {
                $dir=dirname($dir);
        }
-} #}}}
+}
+
+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 refresh () { #{{{
-       # find existing pages
-       my %exists;
+sub find_src_files () {
        my @files;
        my @files;
+       my %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 {
-                       $_=decode_utf8($_);
-                       if (/$config{wiki_file_prune_regexp}/) {
+                       my $file=decode_utf8($_);
+                       $file=~s/^\Q$config{srcdir}\E\/?//;
+                       return if -l $_ || -d _ || ! length $file;
+                       my $page = pagename($file);
+                       if (! exists $pagesources{$page} &&
+                           file_pruned($file)) {
                                $File::Find::prune=1;
                                $File::Find::prune=1;
+                               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;
+
+                       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});
-       find({
-               no_chdir => 1,
-               wanted => sub {
-                       $_=decode_utf8($_);
-                       if (/$config{wiki_file_prune_regexp}/) {
-                               $File::Find::prune=1;
-                       }
-                       elsif (! -d $_ && ! -l $_) {
-                               my ($f)=/$config{wiki_file_regexp}/; # untaint
+       foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
+               find({
+                       no_chdir => 1,
+                       wanted => sub {
+                               my $file=decode_utf8($_);
+                               $file=~s/^\Q$dir\E\/?//;
+                               return if -l $_ || -d _ || ! length $file;
+                               my $page=pagename($file);
+                               if (! exists $pagesources{$page} &&
+                                   file_pruned($file)) {
+                                       $File::Find::prune=1;
+                                       return;
+                               }
+
+                               my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
                                if (! defined $f) {
                                if (! defined $f) {
-                                       warn("skipping bad filename $_\n");
+                                       warn(sprintf(gettext("skipping bad filename %s"), $file)."\n");
                                }
                                else {
                                }
                                else {
-                                       # Don't add files that are in the
-                                       # srcdir.
-                                       $f=~s/^\Q$config{underlaydir}\E\/?//;
-                                       if (! -e "$config{srcdir}/$f" && 
-                                           ! -l "$config{srcdir}/$f") {
-                                               push @files, $f;
-                                               $exists{pagename($f)}=1;
+                                       # avoid underlaydir override
+                                       # attacks; see security.mdwn
+                                       if (! -l "$config{srcdir}/$f" && 
+                                           ! -e _) {
+                                               if (! $pages{$page}) {
+                                                       push @files, $f;
+                                                       $pages{$page}=1;
+                                               }
                                        }
                                }
                                        }
                                }
-                       }
-               },
-       }, $config{underlaydir});
+                       },
+               }, $dir);
+       };
+       return \@files, \%pages;
+}
 
 
-       my %rendered;
+sub find_new_files ($) {
+       my $files=shift;
+       my @new;
+       my @internal_new;
 
 
-       # 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") unless exists $pagectime{$page};
-                       push @add, $file;
-                       $links{$page}=[];
-                       $pagesources{$page}=$file;
-                       if ($config{getctime} && -e "$config{srcdir}/$file") {
-                               $pagectime{$page}=rcs_getctime("$config{srcdir}/$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_new, $file;
+                       }
+                       else {
+                               push @new, $file;
+                               if ($config{getctime} && -e "$config{srcdir}/$file") {
+                                       eval {
+                                               my $time=rcs_getctime("$config{srcdir}/$file");
+                                               $pagectime{$page}=$time;
+                                       };
+                                       if ($@) {
+                                               print STDERR $@;
+                                       }
+                               }
                        }
                        }
-                       elsif (! exists $pagectime{$page}) {
-                               $pagectime{$page}=mtime(srcfile($file));
+                       $pagecase{lc $page}=$page;
+                       if (! exists $pagectime{$page}) {
+                               $pagectime{$page}=(srcfile_stat($file))[10];
                        }
                }
        }
                        }
                }
        }
+
+       return \@new, \@internal_new;
+}
+
+sub find_del_files ($) {
+       my $pages=shift;
        my @del;
        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;
-                       delete $pagesources{$page};
+       my @internal_del;
+
+       foreach my $page (keys %pagemtime) {
+               if (! $pages->{$page}) {
+                       if (isinternal($page)) {
+                               push @internal_del, $pagesources{$page};
+                       }
+                       else {
+                               push @del, $pagesources{$page};
+                       }
+                       $links{$page}=[];
+                       $renderedfiles{$page}=[];
+                       $pagemtime{$page}=0;
                }
        }
                }
        }
+
+       return \@del, \@internal_del;
+}
+
+sub remove_del (@) {
+       foreach my $file (@_) {
+               my $page=pagename($file);
+               if (! isinternal($page)) {
+                       debug(sprintf(gettext("removing old page %s"), $page));
+               }
+       
+               foreach my $old (@{$oldrenderedfiles{$page}}) {
+                       prune($config{destdir}."/".$old);
+               }
+
+               foreach my $source (keys %destsources) {
+                       if ($destsources{$source} eq $page) {
+                               delete $destsources{$source};
+                       }
+               }
        
        
-       # render any updated files
-       foreach my $file (@files) {
+               delete $pagecase{lc $page};
+               delete $pagesources{$page};
+       }
+}
+
+sub find_changed ($) {
+       my $files=shift;
+       my @changed;
+       my @internal_changed;
+       foreach my $file (@$files) {
                my $page=pagename($file);
                my $page=pagename($file);
-               
-               if (! exists $oldpagemtime{$page} ||
-                   mtime(srcfile($file)) > $oldpagemtime{$page}) {
-                       debug("rendering $file");
-                       render($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)) {
+                               # Preprocess internal page in scan-only mode.
+                               preprocess($page, $page, readfile($srcfile), 1);
+                               push @internal_changed, $file;
+                       }
+                       else {
+                               push @changed, $file;
+                       }
                }
        }
                }
        }
-       
-       # if any files were added or removed, check to see if each page
-       # needs an update due to linking to them or inlining 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
-       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;
-                                       }
-                               }
+       return \@changed, \@internal_changed;
+}
+
+sub calculate_old_links ($$) {
+       my ($changed, $del)=@_;
+       my %oldlink_targets;
+       foreach my $file (@$changed, @$del) {
+               my $page=pagename($file);
+               if (exists $oldlinks{$page}) {
+                       foreach my $l (@{$oldlinks{$page}}) {
+                               $oldlink_targets{$page}{$l}=bestlink($page, $l);
                        }
                }
        }
                        }
                }
        }
+       return \%oldlink_targets;
+}
 
 
-       # Handle backlinks; if a page has added/removed links, update the
-       # pages it links to. Also handles rebuilding dependant pages.
-       # 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 || @del) {
-               foreach my $f (@files) {
-                       my $p=pagename($f);
-                       if (exists $depends{$p}) {
-                               foreach my $file (keys %rendered, @del) {
-                                       next if $f eq $file;
-                                       my $page=pagename($file);
-                                       if (globlist_match($page, $depends{$p})) {
-                                               debug("rendering $f, which depends on $page");
-                                               render($f);
-                                               $rendered{$f}=1;
-                                               last;
-                                       }
+sub derender_internal ($) {
+       my $file=shift;
+       my $page=pagename($file);
+       delete $depends{$page};
+       delete $depends_simple{$page};
+       foreach my $old (@{$renderedfiles{$page}}) {
+               delete $destsources{$old};
+       }
+       $renderedfiles{$page}=[];
+}
+
+sub render_linkers ($) {
+       my $f=shift;
+       my $p=pagename($f);
+       foreach my $page (keys %{$backlinks{$p}}) {
+               my $file=$pagesources{$page};
+               render($file, sprintf(gettext("building %s, which links to %s"), $file, $p));
+       }
+}
+
+sub remove_unrendered () {
+       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);
+                       }
+               }
+       }
+}
+
+sub calculate_changed_links ($$$) {
+       my ($changed, $del, $oldlink_targets)=@_;
+
+       my (%backlinkchanged, %linkchangers);
+
+       foreach my $file (@$changed, @$del) {
+               my $page=pagename($file);
+
+               if (exists $links{$page}) {
+                       foreach my $l (@{$links{$page}}) {
+                               my $target=bestlink($page, $l);
+                               if (! exists $oldlink_targets->{$page}{$l} ||
+                                   $target ne $oldlink_targets->{$page}{$l}) {
+                                       $backlinkchanged{$target}=1;
+                                       $linkchangers{lc($page)}=1;
                                }
                                }
+                               delete $oldlink_targets->{$page}{$l};
                        }
                }
                        }
                }
-               
-               my %linkchanged;
-               foreach my $file (keys %rendered, @del) {
-                       my $page=pagename($file);
-                       
-                       if (exists $links{$page}) {
-                               foreach my $link (map { bestlink($page, $_) } @{$links{$page}}) {
-                                       if (length $link &&
-                                           (! exists $oldlinks{$page} ||
-                                            ! grep { bestlink($page, $_) eq $link } @{$oldlinks{$page}})) {
-                                               $linkchanged{$link}=1;
-                                       }
+               if (exists $oldlink_targets->{$page} &&
+                   %{$oldlink_targets->{$page}}) {
+                       foreach my $target (values %{$oldlink_targets->{$page}}) {
+                               $backlinkchanged{$target}=1;
+                       }
+                       $linkchangers{lc($page)}=1;
+               }
+       }
+
+       return \%backlinkchanged, \%linkchangers;
+}
+
+sub render_dependent ($$$$$$$) {
+       my ($files, $new, $internal_new, $del, $internal_del,
+               $internal_changed, $linkchangers)=@_;
+
+       my @changed=(keys %rendered, @$del);
+       my @exists_changed=(@$new, @$del);
+       
+       my %lc_changed = map { lc(pagename($_)) => 1 } @changed;
+       my %lc_exists_changed = map { lc(pagename($_)) => 1 } @exists_changed;
+        
+       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{$p}}) {
+                               if (($depends_simple{$p}{$d} & $IkiWiki::DEPEND_CONTENT &&
+                                    $lc_changed{$d})
+                                   ||
+                                   ($depends_simple{$p}{$d} & $IkiWiki::DEPEND_PRESENCE &&
+                                    $lc_exists_changed{$d})
+                                   ||
+                                   ($depends_simple{$p}{$d} & $IkiWiki::DEPEND_LINKS &&
+                                    $linkchangers->{$d})
+                               ) {
+                                       $reason = $d;
+                                       last;
                                }
                        }
                                }
                        }
-                       if (exists $oldlinks{$page}) {
-                               foreach my $link (map { bestlink($page, $_) } @{$oldlinks{$page}}) {
-                                       if (length $link &&
-                                           (! exists $links{$page} || 
-                                            ! grep { bestlink($page, $_) eq $link } @{$links{$page}})) {
-                                               $linkchanged{$link}=1;
+               }
+       
+               if (exists $depends{$p} && ! defined $reason) {
+                       foreach my $dep (keys %{$depends{$p}}) {
+                               my $sub=pagespec_translate($dep);
+                               next if $@ || ! defined $sub;
+
+                               # only consider internal files
+                               # if the page explicitly depends
+                               # on such files
+                               my $internal_dep=$dep =~ /internal\(/;
+
+                               my $in=sub {
+                                       my $list=shift;
+                                       my $type=shift;
+                                       foreach my $file (@$list) {
+                                               next if $file eq $f;
+                                               my $page=pagename($file);
+                                               if ($sub->($page, location => $p)) {
+                                                       if ($type == $IkiWiki::DEPEND_LINKS) {
+                                                               next unless $linkchangers->{lc($page)};
+                                                       }
+                                                       return $page;
+                                               }
                                        }
                                        }
+                                       return undef;
+                               };
+
+                               if ($depends{$p}{$dep} & $IkiWiki::DEPEND_CONTENT) {
+                                       last if $reason =
+                                               $in->(\@changed, $IkiWiki::DEPEND_CONTENT);
+                                       last if $internal_dep && ($reason =
+                                               $in->($internal_new, $IkiWiki::DEPEND_CONTENT) ||
+                                               $in->($internal_del, $IkiWiki::DEPEND_CONTENT) ||
+                                               $in->($internal_changed, $IkiWiki::DEPEND_CONTENT));
+                               }
+                               if ($depends{$p}{$dep} & $IkiWiki::DEPEND_PRESENCE) {
+                                       last if $reason = 
+                                               $in->(\@exists_changed, $IkiWiki::DEPEND_PRESENCE);
+                                       last if $internal_dep && ($reason =
+                                               $in->($internal_new, $IkiWiki::DEPEND_PRESENCE) ||
+                                               $in->($internal_del, $IkiWiki::DEPEND_PRESENCE));
+                               }
+                               if ($depends{$p}{$dep} & $IkiWiki::DEPEND_LINKS) {
+                                       last if $reason =
+                                               $in->(\@changed, $IkiWiki::DEPEND_LINKS);
+                                       last if $internal_dep && ($reason =
+                                               $in->($internal_new, $IkiWiki::DEPEND_LINKS) ||
+                                               $in->($internal_del, $IkiWiki::DEPEND_LINKS) ||
+                                               $in->($internal_changed, $IkiWiki::DEPEND_LINKS));
                                }
                        }
                }
                                }
                        }
                }
-               foreach my $link (keys %linkchanged) {
-                       my $linkfile=$pagesources{$link};
-                       if (defined $linkfile) {
-                               debug("rendering $linkfile, to update its backlinks");
-                               render($linkfile);
-                               $rendered{$linkfile}=1;
-                       }
+       
+               if (defined $reason) {
+                       render($f, sprintf(gettext("building %s, which depends on %s"), $f, $reason));
+                       return 1;
                }
        }
 
                }
        }
 
-       if (@del && exists $hooks{delete}) {
-               foreach my $id (keys %{$hooks{delete}}) {
-                       $hooks{delete}{$id}{call}->(@del);
+       return 0;
+}
+
+sub render_backlinks ($) {
+       my $backlinkchanged=shift;
+       foreach my $link (keys %$backlinkchanged) {
+               my $linkfile=$pagesources{$link};
+               if (defined $linkfile) {
+                       render($linkfile, sprintf(gettext("building %s, to update its backlinks"), $linkfile));
                }
        }
                }
        }
-       if (%rendered && exists $hooks{change}) {
-               foreach my $id (keys %{$hooks{change}}) {
-                       $hooks{change}{$id}{call}->(keys %rendered);
-               }
+}
+
+sub refresh () {
+       srcdir_check();
+       run_hooks(refresh => sub { shift->() });
+       my ($files, $pages)=find_src_files();
+       my ($new, $internal_new)=find_new_files($files);
+       my ($del, $internal_del)=find_del_files($pages);
+       my ($changed, $internal_changed)=find_changed($files);
+       run_hooks(needsbuild => sub { shift->($changed) });
+       my $oldlink_targets=calculate_old_links($changed, $del);
+
+       foreach my $file (@$changed) {
+               scan($file);
        }
        }
-} #}}}
+
+       calculate_links();
+       
+       remove_del(@$del, @$internal_del);
+
+       foreach my $file (@$changed) {
+               render($file, sprintf(gettext("building %s"), $file));
+       }
+       foreach my $file (@$internal_new, @$internal_del, @$internal_changed) {
+               derender_internal($file);
+       }
+
+       my ($backlinkchanged, $linkchangers)=calculate_changed_links($changed,
+               $del, $oldlink_targets);
+
+       foreach my $file (@$new, @$del) {
+               render_linkers($file);
+       }
+       
+       if (@$changed || @$internal_changed ||
+           @$del || @$internal_del || @$internal_new) {
+               1 while render_dependent($files, $new, $internal_new,
+                       $del, $internal_del, $internal_changed,
+                       $linkchangers);
+       }
+
+       render_backlinks($backlinkchanged);
+       remove_unrendered();
+
+       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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Unnamed repository; edit this file 'description' to name the repository.