ikiwiki/IkiWiki/Render.pm

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Perl
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#!/usr/bin/perl
package IkiWiki;
use warnings;
use strict;
use IkiWiki;
use Encode;
my %backlinks;
my $backlinks_calculated=0;
sub calculate_backlinks () { #{{{
return if $backlinks_calculated;
%backlinks=();
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;
}
}
}
$backlinks_calculated=1;
} #}}}
sub backlinks ($) { #{{{
my $page=shift;
calculate_backlinks();
my @links;
foreach my $p (keys %{$backlinks{$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) };
}
return @links;
} #}}}
sub parentlinks ($) { #{{{
my $page=shift;
my @ret;
my $pagelink="";
my $path="";
my $title=$config{wikiname};
foreach my $dir (split("/", $page)) {
next if $dir eq 'index';
push @ret, { url => urlto($path, $page), page => $title };
$path.="/".$dir;
$title=pagetitle($dir);
}
return @ret;
} #}}}
sub genpage ($$) { #{{{
my $page=shift;
my $content=shift;
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{cgiurl}) {
$template->param(editurl => cgiurl(do => "edit", page => $page));
$template->param(prefsurl => cgiurl(do => "prefs"));
$actions++;
}
if (length $config{historyurl}) {
my $u=$config{historyurl};
$u=~s/\[\[file\]\]/$pagesources{$page}/g;
$template->param(historyurl => $u);
$actions++;
}
if ($config{discussion}) {
my $discussionlink=gettext("discussion");
if ($page !~ /.*\/\Q$discussionlink\E$/ &&
(length $config{cgiurl} ||
exists $links{$page."/".$discussionlink})) {
$template->param(discussionlink => htmllink($page, $page, gettext("Discussion"), 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(
title => $page eq 'index'
? $config{wikiname}
: pagetitle(basename($page)),
wikiname => $config{wikiname},
parentlinks => [parentlinks($page)],
content => $content,
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);
});
$content=$template->output;
run_hooks(format => sub {
$content=shift->(
page => $page,
content => $content,
);
});
return $content;
} #}}}
sub scan ($) { #{{{
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}) {
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# Discussion links are a special case since they're
# not in the text of the page, but on its template.
$links{$page}=[ $page."/".gettext("discussion") ];
}
else {
$links{$page}=[];
}
run_hooks(scan => sub {
shift->(
page => $page,
content => $content,
);
});
# Preprocess in scan-only mode.
preprocess($page, $page, $content, 1);
}
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else {
will_render($file, $file, 1);
}
} #}}}
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sub fast_file_copy (@) { #{{{
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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 $srcfile=srcfile($file);
if (defined $type) {
my $page=pagename($file);
delete $depends{$page};
will_render($page, htmlpage($page), 1);
return if $type=~/^_/;
my $content=htmlize($page, $page, $type,
linkify($page, $page,
preprocess($page, $page,
filter($page, $page,
readfile($srcfile)))));
my $output=htmlpage($page);
writefile($output, $config{destdir}, genpage($page, $content));
}
else {
delete $depends{$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, $config{destdir}, undef, 1, sub {
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fast_file_copy($srcfile, $file, $srcfd, @_);
});
}
} #}}}
sub prune ($) { #{{{
my $file=shift;
unlink($file);
my $dir=dirname($file);
while (rmdir($dir)) {
$dir=dirname($dir);
}
} #}}}
sub refresh () { #{{{
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# security check, avoid following symlinks in the srcdir path
my $test=$config{srcdir};
while (length $test) {
if (-l $test) {
error("symlink found in srcdir path ($test)");
}
unless ($test=~s/\/+$//) {
$test=dirname($test);
}
}
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run_hooks(refresh => sub { shift->() });
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# find existing pages
my %exists;
my @files;
eval q{use File::Find};
error($@) if $@;
find({
no_chdir => 1,
wanted => sub {
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$_=decode_utf8($_);
if (file_pruned($_, $config{srcdir})) {
$File::Find::prune=1;
}
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;
$exists{pagename($f)}=1;
}
}
},
}, $config{srcdir});
foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
find({
no_chdir => 1,
wanted => sub {
$_=decode_utf8($_);
if (file_pruned($_, $dir)) {
$File::Find::prune=1;
}
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 (! $exists{$page}) {
push @files, $f;
$exists{$page}=1;
}
}
}
}
},
}, $dir);
};
my (%rendered, @add, @del, @internal);
# check for added or removed pages
foreach my $file (@files) {
my $page=pagename($file);
$pagesources{$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 $@;
}
}
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}
$pagecase{lc $page}=$page;
if (! exists $pagectime{$page}) {
$pagectime{$page}=(srcfile_stat($file))[10];
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}
}
}
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;
prune($config{destdir}."/".$_)
foreach @{$oldrenderedfiles{$page}};
delete $pagesources{$page};
foreach (keys %destsources) {
if ($destsources{$_} eq $page) {
delete $destsources{$_};
}
}
}
}
# find changed and new files
my @needsbuild;
foreach my $file (@files) {
my $page=pagename($file);
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) });
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# 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("rendering %s"), $file));
render($file);
$rendered{$file}=1;
}
foreach my $file (@internal) {
# internal pages are not rendered
my $page=pagename($file);
delete $depends{$page};
foreach my $old (@{$renderedfiles{$page}}) {
delete $destsources{$old};
}
$renderedfiles{$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("rendering %s, which links to %s"), $file, $p));
render($file);
$rendered{$file}=1;
}
}
}
if (%rendered || @del || @internal) {
my @changed=(keys %rendered, @del);
# rebuild dependant pages
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foreach my $f (@files) {
next if $rendered{$f};
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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;
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my $page=pagename($file);
if (pagespec_match($page, $depends{$p}, location => $p)) {
debug(sprintf(gettext("rendering %s, which depends on %s"), $f, $page));
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render($f);
$rendered{$f}=1;
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last;
}
}
}
}
# 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);
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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 $oldlinks{$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;
}
}
}
}
foreach my $link (keys %linkchanged) {
my $linkfile=$pagesources{$link};
if (defined $linkfile) {
next if $rendered{$linkfile};
debug(sprintf(gettext("rendering %s, to update its backlinks"), $linkfile));
render($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 rendered 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 render %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($srcfile))[9];
print genpage($page, $content);
exit 0;
} #}}}
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