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| -rw-r--r-- | doc/todo/dependency_types.mdwn | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/doc/todo/dependency_types.mdwn b/doc/todo/dependency_types.mdwn index f13f1448e..59ccc7591 100644 --- a/doc/todo/dependency_types.mdwn +++ b/doc/todo/dependency_types.mdwn @@ -158,7 +158,7 @@ pagecounts much more efficient. ---- -Link dependencies: +### Link dependencies * `add_depends($page, $spec, links => 1, presence => 1)` adds a links + presence dependency. @@ -173,3 +173,33 @@ Link dependencies: TODO: How to determine if a pagespec is valid to be used with a links dependency? Use the same simple pagespecs that are valid for presence dependencies? + +---- + +### the removal problem + +So far I have not addressed fixing the removal problem (which Will +discusses above). + +Summary of problem: A has a dependency on a pagespec such as +"bugs/* and !link(done)". B currently matches. Then B is updated, +in a way that makes A's dependency not match it (ie, it links to done). +Now A is not updated, because ikiwiki does not realize that it +depended on B before. + +This was worked around to fix [[bugs/inline_page_not_updated_on_removal]] +by inline and map adding explicit dependencies on each page that appears +on them. Then a change to B triggers the explicit dep. While this works, +it's 1) ugly 2) probably not implemented by all plugins that could +be affected by this problem (ie, linkmap) and 3) is most of the reason why +we grew the complication of `depends_simple`. + +One way to fix this is to include with each dependency, a list of pages +that currently match it. If the list changes, the dependency is triggered. + +Should be doable, but seems to involve a more work than +currently. Consider that a dependency on "bugs/*" currently +is triggered by just checking until *one* page is found to match it. +But to store the list, *every* page would have to be tried against it. +Unless the list can somehow be intelligently updated, looking at only the +changed pages. |