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trail: Converted all dependencies to presence dependencies.

smcv please note this introduces another bug, which I've opened
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commit 86519b047e6fb96e4c5c5b22cb9619d120bf566e 1 parent dc05125
@joeyh authored
6 IkiWiki/Plugin/
@@ -318,7 +318,7 @@ sub prerender {
$prev = $members->[$i - 1] if $i > 0;
my $next = $members->[$i + 1];
- add_depends($member, $trail);
+ add_depends($member, $trail, deptype("presence"));
$member_to_trails{$member}{$trail} = [$prev, $next];
@@ -406,13 +406,13 @@ sub pagetemplate (@) {
my ($prevurl, $nexturl, $prevtitle, $nexttitle);
if (defined $prev) {
- add_depends($params{destpage}, $prev);
+ add_depends($params{destpage}, $prev, deptype("presence"));
$prevurl = urlto($prev, $page);
$prevtitle = title_of($prev);
if (defined $next) {
- add_depends($params{destpage}, $next);
+ add_depends($params{destpage}, $next, deptype("presence"));
$nexturl = urlto($next, $page);
$nexttitle = title_of($next);
1  debian/changelog
@@ -3,6 +3,7 @@ ikiwiki (3.20121213) UNRELEASED; urgency=low
* htmlscrubber: Allow the bitcoin URI scheme.
* aggregate: When run with --aggregate, if an aggregation is already
running, don't go on and --refresh.
+ * trail: Converted all dependencies to presence dependencies.
-- Joey Hess <> Sat, 22 Dec 2012 16:15:24 -0400
26 doc/bugs/trail_excess_dependencies.mdwn
@@ -0,0 +1,26 @@
+I've just modified the trail plugin to use only presence, and not
+content dependencies. Using content dependencies, particularly to the page
+that defines the trail, meant that every time that page changed, *every*
+page in the trail gets rebuilt. This leads to users setting up sites that
+have horrible performance, if the trail is defined in, for example, the top
+page of a blog.
+Unfortunatly, this change to presence dependencies has
+introduced a bug. Now when an existing trail is removed, the pages in the
+trail don't get rebuilt to remove the trail (both html display and state).
+I think that to fix this bug, the plugin should use a hook to
+force rebuilding of all the pages that were in the trail, when
+the trail is removed (or changed).
+There's a difficulty in doing that: The needsbuild hook runs before the scan
+hook, so before it has a chance to see if the trail directive is still there.
+It'd need some changes to ikiwiki's hooks.
+(An improvement in this area would probably simplify other plugins, which
+currently abuse the needsbuild hook to unset state, to handle the case
+where the directive that resulted in that state is removed.)
+I apologise for introducing a known bug, but the dependency mess was too
+bad to leave as-is. And I have very little time (and regrettably, even less
+power) to deal with it right now. :( --[[Joey]]

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