From c7bf305c81e01f9a49e110a33665cc692cfe0859 Mon Sep 17 00:00:00 2001
From: Simon McVittie <smcv@debian.org>
Date: Sat, 27 Nov 2010 13:40:11 +0000
Subject: [PATCH] GC unused pages in the transient underlay

---
 IkiWiki/Plugin/transient.pm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/IkiWiki/Plugin/transient.pm b/IkiWiki/Plugin/transient.pm
index 5764467ab..2784164f6 100644
--- a/IkiWiki/Plugin/transient.pm
+++ b/IkiWiki/Plugin/transient.pm
@@ -8,6 +8,7 @@ use IkiWiki 3.00;
 sub import {
 	hook(type => "getsetup", id => "transient",  call => \&getsetup);
 	hook(type => "checkconfig", id => "transient", call => \&checkconfig);
+	hook(type => "change", id => "transient", call => \&change);
 }
 
 sub getsetup () {
@@ -30,4 +31,17 @@ sub checkconfig () {
 	add_underlay($transientdir);
 }
 
+sub change (@) {
+	foreach my $file (@_) {
+		# if the corresponding file exists in the transient underlay
+		# and isn't actually being used, we can get rid of it
+		my $page = pagename($file);
+		my $casualty = "$transientdir/$page.$config{default_pageext}";
+		if (srcfile($file) ne $casualty && -e $casualty) {
+			debug(sprintf(gettext("removing transient version of %s"), $page));
+			IkiWiki::prune($casualty);
+		}
+	}
+}
+
 1;
-- 
2.39.5