Optimize the dependencies list

On a large wiki you can spend a lot of time reading through large lists
of dependencies to see whether files need to be rebuilt (album, with its
one-page-per-photo arrangement, suffers particularly badly from this).

The dependency list is currently a single pagespec, but it's not used like
a normal pagespec - in practice, it's a list of pagespecs joined with the
"or" operator.

Accordingly, change it to be stored as a list of pagespecs. On a wiki
with many tagged photo albums, this reduces the time to refresh after
`touch tags/*.mdwn` from about 31 to 25 seconds.

Getting the benefit of this change on an existing wiki requires a rebuild.

1 files changed, 6 insertions, 6 deletions

diff --git a/t/index.t b/t/index.t
index e79609902..107dac9d0 100755
--- a/t/index.t
+++ b/t/index.t
@@ -32,9 +32,9 @@ $renderedfiles{"bar.png"}=["bar.png"];
 $links{"Foo"}=["bar.png"];
 $links{"bar"}=["Foo", "new-page"];
 $links{"bar.png"}=[];
-$depends{"Foo"}="";
-$depends{"bar"}="foo*";
-$depends{"bar.png"}="";
+$depends{"Foo"}=[];
+$depends{"bar"}=["foo*"];
+$depends{"bar.png"}=[];
 $pagestate{"bar"}{meta}{title}="a page about bar";
 $pagestate{"bar"}{meta}{moo}="mooooo";
 # only loaded plugins save state, so this should not be saved out
@@ -80,9 +80,9 @@ is_deeply(\%links, {
 	"bar.png" => [],
 }, "%links loaded correctly");
 is_deeply(\%depends, {
-	Foo => "",
-	bar => "foo*",
-	"bar.png" => "",
+	Foo => [],
+	bar => ["foo*"],
+	"bar.png" => [],
 }, "%depends loaded correctly");
 is_deeply(\%pagestate, {
 	bar => {