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authorJoey Hess <joey@gnu.kitenet.net>2009-05-22 18:08:50 -0400
committerJoey Hess <joey@gnu.kitenet.net>2009-05-22 18:08:50 -0400
commit4008106c66869b8285680e90c501a91debb1652b (patch)
treea8ab98c02b3d51798491fefb71b3572c5fdf4051 /doc/todo
parent6ae08d3272355d21591d83a87d4e89c016eb5dc8 (diff)
response
Diffstat (limited to 'doc/todo')
-rw-r--r--doc/todo/tracking_bugs_with_dependencies.mdwn55
1 files changed, 54 insertions, 1 deletions
diff --git a/doc/todo/tracking_bugs_with_dependencies.mdwn b/doc/todo/tracking_bugs_with_dependencies.mdwn
index 6e55e46af..b63c73916 100644
--- a/doc/todo/tracking_bugs_with_dependencies.mdwn
+++ b/doc/todo/tracking_bugs_with_dependencies.mdwn
@@ -257,6 +257,9 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
>>>> To fix that I'll need to pass a reference to that array into pagespec_makeperl.
>>>> I think I can then do the same thing to $params{specFuncs}. -- [[Will]]
+>>>>> You're right -- I did not think the recursive case through.
+>>>>> --[[Joey]]
+
> * Seems that the only reason `match_glob` has to check for `~` is
> because when a named spec appears in a pagespec, it is translated
> to `match_glob("~foo")`. If, instead, `pagespec_makeperl` checked
@@ -283,13 +286,18 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
>>>> and
- define(aStar, a*) and link(aStar)
+ define(aStar, a*) and link(~aStar)
>>>> In the first case, we want the pagespec to match any page that links to a page matching the glob.
>>>> In the second case, we want the pagespec to match any page that links to a page matching the named spec.
>>>> match_link() was already doing existential part. The patches to this code were simply to remove the `lc()`
>>>> call from the named pagespec name. Can that `lc` be removed entirely? -- [[Will]]
+>>>>> I think we could get rid of it. `bestlink` will lc it itself
+>>>>> if the uppercase version does not exist; `match_glob` matches
+>>>>> insensitively.
+>>>>> --[[Joey]]
+
> * Generally, the need to modify `match_*` functions so that they
> check for and handle named pagespecs seems suboptimal, if
> only because there might be others people may want to use named
@@ -310,6 +318,25 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
>>>> Yes, and it can do that in just three lines of code. But if we automatically check for named pagespecs all the time we
>>>> potentially break any matching function that doesn't accept pages, or wants to use multiple arguments.
+>>>>> 3 lines of code, plus the functions called become part of the API,
+>>>>> don't forget about that..
+>>>>>
+>>>>> Yes, I think that is the tradeoff, the question is whether to export
+>>>>> the additional complexity needed for that flexability.
+>>>>>
+>>>>> I'd be suprised if multiple argument pagespecs become necessary..
+>>>>> with the exception of this patch there has been no need for them yet.
+>>>>>
+>>>>> There are lots of pagespecs that take data other than pages,
+>>>>> indeed, that's really the common case. So far, none of them
+>>>>> seem likely to take data that starts with a `~`. Perhaps
+>>>>> the thing to do would be to check if `~foo` is a known,
+>>>>> named pagespec, and if not, just pass it through unchanged.
+>>>>> Then there's little room for ambiguity, and this also allows
+>>>>> pagespecs like `glob(~foo*)` to match the literal page `~foo`.
+>>>>> (It will make pagespec_merge even harder tho.. see below.)
+>>>>> --[[Joey]]
+
> * I need to check if your trick to avoid infinite recursion
> works if there are two named specs that recursively
> call one-another. I suspect it does, but will test this
@@ -339,6 +366,13 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
>>>>> Looks like its bracketed in the code anyway... -- [[Will]]
+>>>> Perhaps the thing to do is to have a `clear_defines()`
+>>>> function, then merging `A` and `B` yields `(A) or (clear_defines() and (B))`
+>>>> That would deal with both the cases where `A` and `B` differently
+>>>> define `~foo` as well as with the case where `A` defines `~foo` while
+>>>> `B` uses it to refer to a literal page.
+>>>> --[[Joey]]
+
>> Secondly, it seems that there are two types of dependency, and ikiwiki
>> currently only handles one of them. The first type is "Rebuild this
>> page when any of these other pages changes" - ikiwiki handles this.
@@ -385,11 +419,25 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
>>>>> are inlined, the previous type handles a change in the content of any of those pages. Shortcut does not need this type of
>>>>> dependency. Most of the places that use `add_depends()` seem to need this type of dependency rather than the first type.
+>>>>>> Note that inline and map currently achieve the second type of dependency by
+>>>>>> explicitly calling `add_depends` for each page the displayed.
+>>>>>> If any of those pages are removed, the regular pagespec would not
+>>>>>> match them -- since they're gone. However, the explicit dependency
+>>>>>> on them does cause them to match. It's an ugly corner I'd like to
+>>>>>> get rid of. --[[Joey]]
+
>>>>> Implementation Details: The first type of dependency can be handled very similarly to the current
>>>>> dependency system. You just need to keep a list of pages that the content depends upon. You could
>>>>> keep that list as a pagespec, but if you do this you might want to check that the pagespec doesn't change,
>>>>> possibly by adding a dependency of the second type along with the dependency of the first type.
+>>>>>> An example of the current system not tracking enough data is
+>>>>>> where A inlines B which inlines C. A change to C will cause B to
+>>>>>> rebuild, but A will not "notice" that B has implicitly changed.
+>>>>>> That example suggests it might be fixable without explicitly storing
+>>>>>> data, by causing a rebuild of B to be treated as a change to B.
+>>>>>> --[[Joey]]
+
>>>>> The second type of dependency is a little more tricky. For each page, we'd need a list of pagespecs that
>>>>> the page depended on, and for each pagespec you'd want to store the list of pages that currently match it.
>>>>> On refresh, you'd need to check each pagespec to see if the set of pages that match it has changed, and if
@@ -411,6 +459,11 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W
Patch updated to use closures rather than inline generated code for named pagespecs. Also includes some new use of ErrorReason where appropriate. -- [[Will]]
+> * Perl really doesn't need forward declarations, honest!
+> * I have doubts about memoizing the anonymous sub created by
+> `pagespec_translate`.
+> * Think where you wrote `+{}` you can just write `{}`
+
----
diff --git a/IkiWiki.pm b/IkiWiki.pm