Optimize away most expensive file prune calls, when refreshing

Benchmarking refresh of a a wiki with 25 thousand pages showed
file_pruned() using most of the time. But, when refreshing, ikiwiki already
knows about nearly all the files. So we can skip calling file_pruned() for
those it knows about. While tricky to do, this sped up a refresh (that
otherwise does no work) by 10-50%.

3 files changed, 49 insertions, 41 deletions

diff --git a/IkiWiki.pm b/IkiWiki.pm
index 97d84c9de..d667e7e10 100644
--- a/IkiWiki.pm
+++ b/IkiWiki.pm
@@ -32,7 +32,6 @@ our $installdir='/usr'; # INSTALLDIR_AUTOREPLACE done by Makefile, DNE
 use Memoize;
 memoize("abs2rel");
 memoize("pagespec_translate");
-memoize("file_pruned");
 memoize("template_file");
 
 sub getsetup () {
@@ -1770,14 +1769,18 @@ sub add_depends ($$) {
 	return 1;
 }
 
-sub file_pruned ($$) {
-	require File::Spec;
-	my $file=File::Spec->canonpath(shift);
-	my $base=File::Spec->canonpath(shift);
-	$file =~ s#^\Q$base\E/+##;
+sub file_pruned ($;$) {
+	my $file=shift;
+	if (@_) {
+		require File::Spec;
+		$file=File::Spec->canonpath($file);
+		my $base=File::Spec->canonpath(shift);
+		return if $file eq $base;
+		$file =~ s#^\Q$base\E/+##;
+	}
 
 	my $regexp='('.join('|', @{$config{wiki_file_prune_regexps}}).')';
-	return $file =~ m/$regexp/ && $file ne $base;
+	return $file =~ m/$regexp/;
 }
 
 sub define_gettext () {
diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
index 246c2260d..a8236b954 100644
--- a/IkiWiki/Render.pm
+++ b/IkiWiki/Render.pm
@@ -279,24 +279,26 @@ sub find_src_files () {
 	find({
 		no_chdir => 1,
 		wanted => sub {
-			$_=decode_utf8($_);
-			if (file_pruned($_, $config{srcdir})) {
+			my $file=decode_utf8($_);
+			$file=~s/^\Q$config{srcdir}\E\/?//;
+			my $page = pagename($file);
+			if (! exists $pagesources{$page} &&
+			    file_pruned($file)) {
 				$File::Find::prune=1;
+				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;
+			return if -l $_ || -d _ || ! length $file;
+
+			my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
+			if (! defined $f) {
+				warn(sprintf(gettext("skipping bad filename %s"), $file)."\n");
+			}
+			else {
+				push @files, $f;
+				if ($pages{$page}) {
+					debug(sprintf(gettext("%s has multiple possible source pages"), $page));
 				}
+				$pages{$page}=1;
 			}
 		},
 	}, $config{srcdir});
@@ -304,27 +306,28 @@ sub find_src_files () {
 		find({
 			no_chdir => 1,
 			wanted => sub {
-				$_=decode_utf8($_);
-				if (file_pruned($_, $dir)) {
+				my $file=decode_utf8($_);
+				$file=~s/^\Q$dir\E\/?//;
+				my $page=pagename($file);
+				if (! exists $pagesources{$page} &&
+				    file_pruned($file)) {
 					$File::Find::prune=1;
+					return;
 				}
-				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;
-							}
+				return if -l $_ || -d _ || ! length $file;
+
+				my ($f) = $file =~ /$config{wiki_file_regexp}/; # untaint
+				if (! defined $f) {
+					warn(sprintf(gettext("skipping bad filename %s"), $file)."\n");
+				}
+				else {
+					# avoid underlaydir override
+					# attacks; see security.mdwn
+					if (! -l "$config{srcdir}/$f" && 
+					    ! -e _) {
+						if (! $pages{$page}) {
+							push @files, $f;
+							$pages{$page}=1;
 						}
 					}
 				}
diff --git a/debian/changelog b/debian/changelog
index ca5409af7..6c4353065 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -10,6 +10,8 @@ ikiwiki (3.14159266) UNRELEASED; urgency=low
   * mirrorlist: Display nothing if list is empty.
   * Fix a bug that could lead to duplicate links being recorded
     for tags.
+  * Optimize away most expensive file prune calls, when refreshing,
+    by only checking new files.
 
  -- Joey Hess <joeyh@debian.org>  Sun, 27 Sep 2009 17:40:03 -0400