refactor

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

diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index bed9cb777c6505195218d00d09842d29a85785bd..3ebb1a324d8a3118b54f0d7c6360587892917b65 100644 (file)
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -7,30 +7,41 @@ use strict;
 use IkiWiki;
 use Encode;
 
 use IkiWiki;
 use Encode;
 

-my %backlinks;
-my $backlinks_calculated=0;
+my (%backlinks, %rendered);
+our %brokenlinks;
+my $links_calculated=0;

 
 

-sub calculate_backlinks () {
-       return if $backlinks_calculated;
-       %backlinks=();
+sub calculate_links () {
+       return if $links_calculated;
+       %backlinks=%brokenlinks=();

        foreach my $page (keys %links) {
                foreach my $link (@{$links{$page}}) {
                        my $bestlink=bestlink($page, $link);
        foreach my $page (keys %links) {
                foreach my $link (@{$links{$page}}) {
                        my $bestlink=bestlink($page, $link);

-                       if (length $bestlink && $bestlink ne $page) {
-                               $backlinks{$bestlink}{$page}=1;
+                       if (length $bestlink) {
+                               $backlinks{$bestlink}{$page}=1
+                                       if $bestlink ne $page;
+                       }
+                       else {
+                               push @{$brokenlinks{$link}}, $page;

                        }
                }
        }
                        }
                }
        }

-       $backlinks_calculated=1;
+       $links_calculated=1;

 }
 
 }
 

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

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

-       calculate_backlinks();
+       calculate_links();
+
+       return keys %{$backlinks{$page}};
+}
+
+sub backlinks ($) {
+       my $page=shift;

 
        my @links;
 
        my @links;

-       foreach my $p (keys %{$backlinks{$page}}) {
+       foreach my $p (backlink_pages($page)) {

                my $href=urlto($p, $page);
                 
                # Trim common dir prefixes from both pages.
                my $href=urlto($p, $page);
                 
                # Trim common dir prefixes from both pages.


@@ -50,6 +61,10 @@ sub backlinks ($) {
 sub genpage ($$) {
        my $page=shift;
        my $content=shift;
 sub genpage ($$) {
        my $page=shift;
        my $content=shift;

+       
+       run_hooks(postscan => sub {
+               shift->(page => $page, content => $content);
+       });

 
        my $templatefile;
        run_hooks(templatefile => sub {
 
        my $templatefile;
        run_hooks(templatefile => sub {


@@ -63,11 +78,14 @@ sub genpage ($$) {
        my $actions=0;
 
        if (length $config{cgiurl}) {
        my $actions=0;
 
        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 (IkiWiki->can("cgi_editpage")) {
+                       $template->param(editurl => cgiurl(do => "edit", page => $page));
+                       $actions++;
+               }
+               if (exists $hooks{auth}) {
+                       $template->param(prefsurl => cgiurl(do => "prefs"));
+                       $actions++;
+               }

        }
                
        if (defined $config{historyurl} && length $config{historyurl}) {
        }
                
        if (defined $config{historyurl} && length $config{historyurl}) {


@@ -77,11 +95,10 @@ sub genpage ($$) {
                $actions++;
        }
        if ($config{discussion}) {
                $actions++;
        }
        if ($config{discussion}) {

-               my $discussionlink=lc(gettext("Discussion"));
-               if ($page !~ /.*\/\Q$discussionlink\E$/ &&
+               if ($page !~ /.*\/\Q$config{discussionpage}\E$/i &&

                   (length $config{cgiurl} ||
                   (length $config{cgiurl} ||

-                   exists $links{$page."/".$discussionlink})) {
-                       $template->param(discussionlink => htmllink($page, $page, gettext("Discussion"), noimageinline => 1, forcesubpage => 1));
+                   exists $links{$page."/".$config{discussionpage}})) {
+                       $template->param(discussionlink => htmllink($page, $page, $config{discussionpage}, noimageinline => 1, forcesubpage => 1));

                        $actions++;
                }
        }
                        $actions++;
                }
        }


@@ -120,10 +137,6 @@ sub genpage ($$) {
        
        $content=$template->output;
        
        
        $content=$template->output;
        

-       run_hooks(postscan => sub {
-               shift->(page => $page, content => $content);
-       });
-

        run_hooks(format => sub {
                $content=shift->(
                        page => $page,
        run_hooks(format => sub {
                $content=shift->(
                        page => $page,


@@ -137,6 +150,8 @@ sub genpage ($$) {
 sub scan ($) {
        my $file=shift;
 
 sub scan ($) {
        my $file=shift;
 

+       debug(sprintf(gettext("scanning %s"), $file));
+

        my $type=pagetype($file);
        if (defined $type) {
                my $srcfile=srcfile($file);
        my $type=pagetype($file);
        if (defined $type) {
                my $srcfile=srcfile($file);


@@ -147,7 +162,7 @@ sub scan ($) {
                if ($config{discussion}) {
                        # Discussion links are a special case since they're
                        # not in the text of the page, but on its template.
                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(gettext("Discussion")) ];
+                       $links{$page}=[ $page."/".lc($config{discussionpage}) ];

                }
                else {
                        $links{$page}=[];
                }
                else {
                        $links{$page}=[];


@@ -192,14 +207,18 @@ sub fast_file_copy (@) {
        }
 }
 
        }
 }
 

-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 $page=pagename($file);
                delete $depends{$page};
        
        my $type=pagetype($file);
        my $srcfile=srcfile($file);
        if (defined $type) {
                my $page=pagename($file);
                delete $depends{$page};

+               delete $depends_simple{$page};

                will_render($page, htmlpage($page), 1);
                return if $type=~/^_/;
                
                will_render($page, htmlpage($page), 1);
                return if $type=~/^_/;
                


@@ -214,6 +233,7 @@ sub render ($) {
        }
        else {
                delete $depends{$file};
        }
        else {
                delete $depends{$file};

+               delete $depends_simple{$file};

                will_render($file, $file, 1);
                
                if ($config{hardlink}) {
                will_render($file, $file, 1);
                
                if ($config{hardlink}) {


@@ -261,30 +281,33 @@ sub srcdir_check () {
 }
 
 sub find_src_files () {
 }
 
 sub find_src_files () {

-       my (@files, %pages);
+       my @files;
+       my %pages;

        eval q{use File::Find};
        error($@) if $@;
        find({
                no_chdir => 1,
                wanted => sub {
        eval q{use File::Find};
        error($@) if $@;
        find({
                no_chdir => 1,
                wanted => sub {

-                       $_=decode_utf8($_);
-                       if (file_pruned($_, $config{srcdir})) {
+                       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 (! -l $_ && ! -d _) {
-                               my ($f)=/$config{wiki_file_regexp}/; # untaint
-                               if (! defined $f) {
-                                       warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
-                               }
-                               else {
-                                       $f=~s/^\Q$config{srcdir}\E\/?//;
-                                       push @files, $f;
-                                       my $pagename = pagename($f);
-                                       if ($pages{$pagename}) {
-                                               debug(sprintf(gettext("%s has multiple possible source pages"), $pagename));
-                                       }
-                                       $pages{$pagename}=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});


@@ -292,46 +315,42 @@ sub find_src_files () {
                find({
                        no_chdir => 1,
                        wanted => sub {
                find({
                        no_chdir => 1,
                        wanted => sub {

-                               $_=decode_utf8($_);
-                               if (file_pruned($_, $dir)) {
+                               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;
                                        $File::Find::prune=1;

+                                       return;

                                }
                                }

-                               elsif (! -l $_ && ! -d _) {
-                                       my ($f)=/$config{wiki_file_regexp}/; # untaint
-                                       if (! defined $f) {
-                                               warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
-                                       }
-                                       else {
-                                               $f=~s/^\Q$dir\E\/?//;
-                                               # avoid underlaydir
-                                               # override attacks; see
-                                               # security.mdwn
-                                               if (! -l "$config{srcdir}/$f" && 
-                                                   ! -e _) {
-                                                       my $page=pagename($f);
-                                                       if (! $pages{$page}) {
-                                                               push @files, $f;
-                                                               $pages{$page}=1;
-                                                       }
+
+                               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);
        };
                                                }
                                        }
                                }
                        },
                }, $dir);
        };

-
-       # Returns a list of all source files found, and a hash of 
-       # the corresponding page names.

        return \@files, \%pages;
 }
 
        return \@files, \%pages;
 }
 

-sub refresh () {
-       srcdir_check();
-       run_hooks(refresh => sub { shift->() });
-       my ($files, $exists)=find_src_files();
+sub find_new_files ($) {
+       my $files=shift;
+       my @new;
+       my @internal_new;

 
 

-       my (%rendered, @add, @del, @internal);
-       # check for added or removed pages

        foreach my $file (@$files) {
                my $page=pagename($file);
                if (exists $pagesources{$page} && $pagesources{$page} ne $file) {
        foreach my $file (@$files) {
                my $page=pagename($file);
                if (exists $pagesources{$page} && $pagesources{$page} ne $file) {


@@ -341,10 +360,10 @@ sub refresh () {
                $pagesources{$page}=$file;
                if (! $pagemtime{$page}) {
                        if (isinternal($page)) {
                $pagesources{$page}=$file;
                if (! $pagemtime{$page}) {
                        if (isinternal($page)) {

-                               push @internal, $file;
+                               push @internal_new, $file;

                        }
                        else {
                        }
                        else {

-                               push @add, $file;
+                               push @new, $file;

                                if ($config{getctime} && -e "$config{srcdir}/$file") {
                                        eval {
                                                my $time=rcs_getctime("$config{srcdir}/$file");
                                if ($config{getctime} && -e "$config{srcdir}/$file") {
                                        eval {
                                                my $time=rcs_getctime("$config{srcdir}/$file");


@@ -361,31 +380,58 @@ sub refresh () {
                        }
                }
        }
                        }
                }
        }

+
+       return \@new, \@internal_new;
+}
+
+sub find_del_files ($) {
+       my $pages=shift;
+       my @del;
+       my @internal_del;
+

        foreach my $page (keys %pagemtime) {
        foreach my $page (keys %pagemtime) {

-               if (! $exists->{$page}) {
+               if (! $pages->{$page}) {

                        if (isinternal($page)) {
                        if (isinternal($page)) {

-                               push @internal, $pagesources{$page};
+                               push @internal_del, $pagesources{$page};

                        }
                        else {
                        }
                        else {

-                               debug(sprintf(gettext("removing old page %s"), $page));

                                push @del, $pagesources{$page};
                        }
                        $links{$page}=[];
                        $renderedfiles{$page}=[];
                        $pagemtime{$page}=0;
                                push @del, $pagesources{$page};
                        }
                        $links{$page}=[];
                        $renderedfiles{$page}=[];
                        $pagemtime{$page}=0;

-                       prune($config{destdir}."/".$_)
-                               foreach @{$oldrenderedfiles{$page}};
-                       delete $pagesources{$page};
-                       foreach (keys %destsources) {
-                               if ($destsources{$_} eq $page) {
-                                       delete $destsources{$_};
-                               }
+               }
+       }
+
+       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};

                        }
                }
                        }
                }

+       
+               delete $pagecase{lc $page};
+               delete $pagesources{$page};

        }
        }

+}

 
 

-       # find changed and new files
-       my @needsbuild;
+sub find_changed ($) {
+       my $files=shift;
+       my @changed;
+       my @internal_changed;

        foreach my $file (@$files) {
                my $page=pagename($file);
                my ($srcfile, @stat)=srcfile_stat($file);
        foreach my $file (@$files) {
                my $page=pagename($file);
                my ($srcfile, @stat)=srcfile_stat($file);


@@ -393,126 +439,244 @@ sub refresh () {
                    $stat[9] > $pagemtime{$page} ||
                    $forcerebuild{$page}) {
                        $pagemtime{$page}=$stat[9];
                    $stat[9] > $pagemtime{$page} ||
                    $forcerebuild{$page}) {
                        $pagemtime{$page}=$stat[9];

+

                        if (isinternal($page)) {
                        if (isinternal($page)) {

-                               push @internal, $file;

                                # Preprocess internal page in scan-only mode.
                                preprocess($page, $page, readfile($srcfile), 1);
                                # Preprocess internal page in scan-only mode.
                                preprocess($page, $page, readfile($srcfile), 1);

+                               push @internal_changed, $file;

                        }
                        else {
                        }
                        else {

-                               push @needsbuild, $file;
+                               push @changed, $file;

                        }
                }
        }
                        }
                }
        }

-       run_hooks(needsbuild => sub { shift->(\@needsbuild) });
+       return \@changed, \@internal_changed;
+}

 
 

-       # scan and render files
-       foreach my $file (@needsbuild) {
-               debug(sprintf(gettext("scanning %s"), $file));
-               scan($file);
-       }
-       calculate_backlinks();
-       foreach my $file (@needsbuild) {
-               debug(sprintf(gettext("building %s"), $file));
-               render($file);
-               $rendered{$file}=1;
-       }
-       foreach my $file (@internal) {
-               # internal pages are not rendered
+sub calculate_old_links ($$) {
+       my ($changed, $del)=@_;
+       my %oldlink_targets;
+       foreach my $file (@$changed, @$del) {

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

-               delete $depends{$page};
-               foreach my $old (@{$renderedfiles{$page}}) {
-                       delete $destsources{$old};
+               if (exists $oldlinks{$page}) {
+                       foreach my $l (@{$oldlinks{$page}}) {
+                               $oldlink_targets{$page}{$l}=bestlink($page, $l);
+                       }

                }
                }

-               $renderedfiles{$page}=[];

        }
        }

-       
-       # rebuild pages that link to added or removed pages
-       if (@add || @del) {
-               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;
+       return \%oldlink_targets;
+}
+
+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);

                        }
                }
        }
                        }
                }
        }

+}

 
 

-       if (%rendered || @del || @internal) {
-               my @changed=(keys %rendered, @del);
+sub calculate_changed_links ($$$) {
+       my ($changed, $del, $oldlink_targets)=@_;

 
 

-               # rebuild dependant pages
-               foreach my $f (@$files) {
-                       next if $rendered{$f};
-                       my $p=pagename($f);
-                       if (exists $depends{$p}) {
-                               # only consider internal files
-                               # if the page explicitly depends on such files
-                               foreach my $file (@changed, $depends{$p}=~/internal\(/ ? @internal : ()) {
-                                       next if $f eq $file;
-                                       my $page=pagename($file);
-                                       if (pagespec_match($page, $depends{$p}, location => $p)) {
-                                               debug(sprintf(gettext("building %s, which depends on %s"), $f, $page));
-                                               render($f);
-                                               $rendered{$f}=1;
-                                               last;
-                                       }
+       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};

                        }
                }
                        }
                }

-               
-               # handle backlinks; if a page has added/removed links,
-               # update the pages it links to
-               my %linkchanged;
-               foreach my $file (@changed) {
-                       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;

                        }
                        }

-                       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;
-                                       }
+                       $linkchangers{lc($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 $depends{$p} && ! defined $reason) {
+                       foreach my $dep (keys %{$depends{$p}}) {
+                               my $sub=pagespec_translate($dep);
+                               next if $@ || ! defined $sub;

 
 

-               foreach my $link (keys %linkchanged) {
-                       my $linkfile=$pagesources{$link};
-                       if (defined $linkfile) {
-                               next if $rendered{$linkfile};
-                               debug(sprintf(gettext("building %s, to update its backlinks"), $linkfile));
-                               render($linkfile);
-                               $rendered{$linkfile}=1;
+                               # 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));
+                               }

                        }
                }
                        }
                }

+       
+               if (defined $reason) {
+                       render($f, sprintf(gettext("building %s, which depends on %s"), $f, $reason));
+                       return 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}."/".$file);
-                       }
+       return 0;
+}
+
+sub render_backlinks ($) {
+       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));

                }
        }
                }
        }

+}
+
+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 (@$del) {
+               run_hooks(delete => sub { shift->(@$del) });

        }
        if (%rendered) {
                run_hooks(change => sub { shift->(keys %rendered) });
        }
        if (%rendered) {
                run_hooks(change => sub { shift->(keys %rendered) });