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Diffstat (limited to 'doc/todo/tracking_bugs_with_dependencies.mdwn')
| -rw-r--r-- | doc/todo/tracking_bugs_with_dependencies.mdwn | 55 |
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 |