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did a scratch implementation of dependancy types, but found it more complex

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Joey Hess 2009-10-03 17:38:47 -04:00
parent c7bdd17087
commit bd958f91a2
1 changed files with 32 additions and 5 deletions
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doc/todo/dependency_types.mdwn
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@ -12,7 +12,7 @@ unnecessary page rebuilds:
* meta only cares if the pages are added or removed. Content change does
not matter (unless show=title is used).
* brokenlinks, orphans, pagecount, ditto
* brokenlinks, orphans, pagecount, ditto (generally)
* inline in archive mode cares about page title, author changing, but
not content. (Ditto for meta with show=title.)
* Causes extra work when solving the [[bugs/transitive_dependencies]]
@ -109,9 +109,6 @@ I propose the following. --[[Joey]]
* `add_depends` defaults to adding a regular ("full") dependency, as
before. (So nothing breaks.)
* `add_depends($page, $spec, content => 0)` adds an contentless dependency.
* Contentless dependencies are stored in `%depends_contentless` and
`%depends_contentless_simple`, which are stored in the index similarly
to the existing hashes.
* `refresh` only looks at added/removed pages when resolving contentless
dependencies.
@ -121,5 +118,35 @@ to the two types he talks about above, but I hope are close enough that
they can be used.
This doesn't deal with the stuff that only depend on the metadata of a
page, as collected in the scan pass, changing. But it does leave a window
page, as collected in the scan pass, changing. But it does leave a window
open for adding such a dependency type later.
----
I implemented the above in a branch.
[[!template id=gitbranch branch=origin/dependency-types author="[[joey]]"]]
Then I found some problems:
* pagestats is often used with a pagespec that uses `tagged()`.
A pure contentless dependency does not work for that, it needs to look
at link info.
* orphans and brokenlinks cannot use contentless dependencies because they
need to update when links change.
* Something simple like pagecount, that seems like it could use a
contentless dependency, can have a pagespec that uses metadata, like
`author()` or `copyright()`.
Now I'm thinking about having a contentless dependency look at page
metadata, and fire if the metadata changes. And it seems links should
either be included in that, or there should be a way to make a dependency
that fires when a page's links change. (And what about backlinks?)
It's easy to see when a page's links change, since there is `%oldlinks`.
To see when metadata is changed is harder, since it's stored in the
pagestate by the meta plugin.
(Alternative: Make add_depends look at the pagespec. Ie, if it is a simple
page name, or a glob, we know a contentless dependency can be valid.
If's more complex, convert the dependency from contentless to full. Finding
a non-ad-hoc, non-sucky way to do that could be hard.)