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| -rw-r--r-- | doc/todo/tracking_bugs_with_dependencies.mdwn | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/doc/todo/tracking_bugs_with_dependencies.mdwn b/doc/todo/tracking_bugs_with_dependencies.mdwn index b63c73916..3a761731b 100644 --- a/doc/todo/tracking_bugs_with_dependencies.mdwn +++ b/doc/todo/tracking_bugs_with_dependencies.mdwn @@ -337,6 +337,14 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W >>>>> (It will make pagespec_merge even harder tho.. see below.) >>>>> --[[Joey]] +>>>>>> I've already used multi-argument pagespec match functions in +>>>>>> my data plugin. It is used for having different types of links. If +>>>>>> you want to have multiple types of links, then the match function +>>>>>> for them needs to take both the link name and the link type. +>>>>>> I'm trying to think of a way we could have both - automatically +>>>>>> handle the existential case unless the function indicates somehow +>>>>>> that it'll do it itself. Any ideas? -- [[Will]] + > * 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 @@ -373,6 +381,33 @@ account all comments above (which doesn't mean it is above reproach :) ). --[[W >>>> `B` uses it to refer to a literal page. >>>> --[[Joey]] +>>>>> I don't think this will work with the new patch, and I don't think it was needed with the old one. +>>>>> Under the old patch, pagespec_makeperl() generated a string of unevaluated, self-contained, perl +>>>>> code. When a new named pagespec was defined, a recursive call was made to get the perl code +>>>>> for the pagespec, and then that code was used to add something like `$params{specFuncs}->{name} = sub {recursive code} and ` +>>>>> to the result of the calling function. This means that at pagespec testing time, when this code is executed, the +>>>>> specFuncs hash is built up as the pagespec is checked. In the case of the 'or' used above, later redefinitions of +>>>>> a named pagespec would have redefined the specFunc at the right time. It should have just worked. However... + +>>>>> Since my original patch, you started using closures for security reasons (and I can see the case for that). Unfortunately this +>>>>> means that the generated perl code is no longer self-contained - it needs to be evaluated in the same closure it was generated +>>>>> so that it has access to the data array. To make this work with the recursive call I had two options: a) make the data array a +>>>>> reference that I pass around through the pagespec_makeperl() functions and have available when the code is finally evaluated +>>>>> in pagespec_translate(), or b) make sure that each pagespec is evaluated in its correct closure and a perl function is returned, not a +>>>>> string containing unevaluated perl code. + +>>>>> I went with option b). I did it in such a way that the hash of specfuncs is built up at translation time, not at execution time. This +>>>>> means that with the new code you can call specfuncs that get defined out of order: + + ~test and define(~test, blah) + +>>>>> but it also means that using a simple 'or' to join two pagespecs wont work. If you do something like this: + + ~test and define(~test, foo) and define(~test, baz) + +>>>>> then the last definition (baz) takes precedence. +>>>>> In the process of writing this I think I've come up with a way to change this back the way it was, still using closures. -- [[Will]] + >> 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. @@ -460,10 +495,18 @@ 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! + +>> It complained (warning, not error) when I didn't use the forward declaration. :( + > * I have doubts about memoizing the anonymous sub created by > `pagespec_translate`. + +>> This is there explicitly to make sure that runtime is polynomial and not exponential. + > * Think where you wrote `+{}` you can just write `{}` +>> Possibly :) -- [[Will]] + ---- diff --git a/IkiWiki.pm b/IkiWiki.pm |