477 lines
21 KiB
Markdown
477 lines
21 KiB
Markdown
I like the idea of [[tips/integrated_issue_tracking_with_ikiwiki]], and I do so on several wikis. However, as far as I can tell, ikiwiki has no functionality which can represent dependencies between bugs and allow pagespecs to select based on dependencies. For instance, I can't write a pagespec which selects all bugs with no dependencies on bugs not marked as done. --[[JoshTriplett]]
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> I started having a think about this. I'm going to start with the idea that expanding
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> the pagespec syntax is the way to attack this. It seems that any pagespec that is going
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> to represent "all bugs with no dependencies on bugs not marked as done" is going to
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> need some way to represent "bugs not marked as done" as a collection of pages, and
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> then represent "bugs which do not link to pages in the previous collection".
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>
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> One way to do this would be to introduce variables into the pagespec, along with
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> universal and/or existential [[!wikipedia Quantification]]. That looks quite complex.
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>
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>> I thought about this briefly, and got about that far.. glad you got
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>> further. :-) --[[Joey]]
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>> Or, one [[!taglink could also refer|pagespec_in_DL_style]] to the language of [[!wikipedia description logics]]: their formulas actually define classes of objects through quantified relations to other classes. --Ivan Z.
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>
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> Another option would be go with a more functional syntax. The concept here would
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> be to allow a pagespec to appear in a 'pagespec function' anywhere a page can. e.g.
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> I could pass a pagespec to `link()` and that would return true if there is a link to any
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> page matching the pagespec. This makes the variables and existential quantification
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> implicit. It would allow the example requested above:
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>
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>> `bugs/* and !*/Discussion and !link(bugs/* and !*/Discussion and !link(done))`
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>
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> Unfortunately, this is also going to make the pagespec parsing more complex because
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> we now need to parse nested sets of parentheses to know when the nested pagespec
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> ends, and that isn't a regular language (we can't use regular expression matching for
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> easy parsing).
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>
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>> Also, it may cause ambiguities with page names that contain parens
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>> (though some such ambigutities already exist with the pagespec syntax).
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>
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> One simplification of that would be to introduce some pagespec [[shortcuts]]. We could
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> then allow pagespec functions to take either pages, or named pagespec shortcuts. The
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> pagespec shortcuts would just be listed on a special page, like current [[shortcuts]].
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> (It would probably be a good idea to require that shortcuts on that page can only refer
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> to named pagespecs higher up that page than themselves. That would stop some
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> looping issues...) These shortcuts would be used as follows: when trying to match
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> a page (without globs) you look to see if the page exists. If it does then you have a
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> match. If it doesn't, then you look to see if a similarly named pagespec shortcut
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> exists. If it does, then you check that pagespec recursively to see if you have a match.
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> The ordering requirement on named pagespecs stops infinite recursion.
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>
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> Does that seem like a reasonable first approach?
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>
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> -- [[Will]]
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>> Having a separate page for the shortcuts feels unwieldly.. perhaps
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>> instead the shortcut could be defined earlier in the scope of the same
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>> pagespec that uses it?
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>>
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>> Example: `define(~bugs, bugs/* and !*/Discussion) and define(~openbugs, ~bugs and !link(done)) and ~openbugs and !link(~openbugs)`
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>>> That could work. parens are only ever nested 1 deep in that grammar so it is regular and the current parsing would be ok.
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>> Note that I made the "~" explicit, not implicit, so it could be left out. In the case of ambiguity between
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>> a definition and a page name, the definition would win.
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>>> That was my initial thought too :), but when implementing it I decided that requiring the ~ made things easier. I'll probably require the ~ for the first pass at least.
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>> So, equivilant example: `define(bugs, bugs/* and !*/Discussion) and define(openbugs, bugs and !link(done)) and openbugs and !link(openbugs)`
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>>
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>> Re recursion, it is avoided.. but building a pagespec that is O(N^X) where N is the
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>> number of pages in the wiki is not avoided. Probably need to add DOS prevention.
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>> --[[Joey]]
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>>> If you memoize the outcomes of the named pagespecs you can make in O(N.X), no?
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>>> -- [[Will]]
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>>>> Yeah, guess that'd work. :-)
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> <a id="another_kind_of_links" />One quick further thought. All the above discussion assumes that 'dependency' is the
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> same as 'links to', which is not really true. For example, you'd like to be able to say
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> "This bug does not depend upon [ [ link to other bug ] ]" and not have a dependency.
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> Without having different types of links, I don't see how this would be possible.
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>
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> -- [[Will]]
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>> I saw that this issue is targeted at by the work on [[structured page data#another_kind_of_links]]. --Ivan Z.
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Okie - I've had a quick attempt at this. Initial patch attached. This one doesn't quite work.
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And there is still a lot of debugging stuff in there.
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At the moment I've added a new preprocessor plugin, `definepagespec`, which is like
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shortcut for pagespecs. To reference a named pagespec, use `~` like this:
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[ [!definepagespec name="bugs" spec="bugs/* and !*/Discussion"]]
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[ [!definepagespec name="openbugs" spec="~bugs and !link(done)"]]
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[ [!definepagespec name="readybugs" spec="~openbugs and !link(~openbugs)"]]
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At the moment the problem is in `match_link()` when we're trying to find a sub-page that
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matches the appropriate page spec. There is no good list of pages available to iterate over.
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foreach my $nextpage (keys %IkiWiki::pagesources)
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does not give me a good list of pages. I found the same thing when I was working on
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this todo [[todo/Add_a_plugin_to_list_available_pre-processor_commands]].
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> I'm not sure why iterating over `%pagesources` wouldn't work here, it's the same method
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> used by anything that needs to match a pagespec against all pages..? --[[Joey]]
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>> My uchecked hypothesis is that %pagesources is created after the refresh hook.
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>> I've also been concerned about how globally defined pagespec shortcuts would interact with
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>> the page dependancy system. Your idea of internally defined shortcuts should fix that. -- [[Will]]
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>>> You're correct, the refresh hook is run very early, before pagesources
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>>> is populated. (It will be partially populated on a refresh, but will
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>>> not be updated to reflect new pages.) Agree that internally defined
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>>> seems the way to go. --[[Joey]]
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Immediately below is a patch which seems to basically work. Lots of debugging code is still there
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and it needs a cleanup, but I thought it worth posting at this point. (I was having problems
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with old style glob lists, so i just switched them off for the moment.)
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The following three inlines work for me with this patch:
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Bugs:
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[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and ~bugs" archive="yes"]]
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OpenBugs:
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[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and define(~openbugs,~bugs and !link(done)) and ~openbugs" archive="yes"]]
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ReadyBugs:
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[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and define(~openbugs,~bugs and !link(done)) and define(~readybugs,~openbugs and !link(~openbugs)) and ~readybugs" archive="yes"]]
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> Nice! Could the specfuncsref be passed in %params? I'd like to avoid
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> needing to change the prototype of every pagespec function, since several
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> plugins define them too. --[[Joey]]
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>> Maybe - it needs more thought. I also considered it when I was going though changing all those plugins :).
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>> My concern was that `%params` can contain other user-defined parameters,
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>> e.g. `link(target, otherparameter)`, and that means that the specFuncs could be clobbered by a user (or other
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>> weird security hole). I thought it better to separate it, but I didn't think about it too hard. I might move it to
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>> the first parameter rather than the second. Ikiwiki is my first real perl hacking and I'm still discovering
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>> good ways to write things in perl.
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>>
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>>>> `%params` contains the parameters passed to `pagespec_match`, not
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>>>> user-supplied parameters. The user-supplied parameter to a function
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>>>> like `match_glob()` or `match_link()` is passed in the second positional parameter. --[[Joey]]
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>>>>> OK. That seems reasonable then. The only problem is that my PERLfu is not strong enough to make it
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>>>>> work. I really have to wonder what substance was influencing the designers of PERL...
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>>>>> I can't figure out how to use the %params. And I'm pissed off enough with PERL that I'm not going
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>>>>> to try and figure it out any more. There are two patches below now. The first one uses an extra
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>>>>> argument and works. The second one tries to use %params and doesn't - take your pick :-). -- [[Will]]
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>> What do you think is best to do about `is_globlist()`? At the moment it requires that the 'second word', as
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>> delimited by a space and ignoring parens, is 'and' or 'or'. This doesn't hold in the above example pagespecs (so I just hard wired it to 0 to test my patch).
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>> My thought was just to search for 'and' or 'or' as words anywhere in the pagespec. Thoughts?
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>>> Dunno, we could just finish deprecating it. Or change the regexp to
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>>> skip over spaces in parens. (`/[^\s]+\s+([^)]+)/`) --[[Joey]]
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>>>> I think I have a working regexp now.
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>> Oh, one more thing. In pagespec_translate (now pagespec_makeperl), there is a part of the regular expression for `# any other text`.
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>> This contained `()`, which has no effect. I replaced that with `\(\)`, but that is a change in the definition of pagespecs unrelated to the
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>> rest of this patch. In a related change, commands were not able to contain `)` in their parameters. I've extended that so the cannot
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>> contain `(` or `)`. -- [[Will]]
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>>> `[^\s()]+` is a character class matching all characters not spaces or
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>>> parens. Since the pervious terminals in the regexp consume most
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>>> occurances of an open paren or close paren, it's unlikely for one to
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>>> get through to that part of the regexp. For example, "foo()" will be
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>>> matched by the command matcher; "(foo)" will be matched by the open
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>>> paren literal terminal. "foo(" and "foo)" can get through to the
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>>> end, and would be matched as a page name, if it didn't exclude parens.
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>>>
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>>> So why exclude them? Well, consider "foo and(bar and baz)". We don't
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>>> want it to match "and(" as a page name!
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>>>
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>>> Escaping the parens in the character class actually changes nothing; the
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>>> changed character class still matches all characters not spaces or
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>>> parens. (Try it!).
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>>>
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>>> Re commands containing '(', I don't really see any reason not to
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>>> allow that, unless it breaks something. --[[Joey]]
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>>>> Oh, I didn't realise you didn't need to escape parens inside []. All else I
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>>>> I understood. I have stopped commands from containing parens because
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>>>> once you allow that then you might have a extra level of depth in the parsing
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>>>> of define() statements. -- [[Will]]
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>>> Updated patch. Moved the specFuncsRef to the front of the arg list. Still haven't thought through the security implications of
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>>> having it in `%params`. I've also removed all the debugging `print` statements. And I've updated the `is_globlist()` function.
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>>> I think this is ready for people other than me to have a play. It is not well enough tested to commit just yet.
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>>> -- [[Will]]
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I've lost track of the indent level, so I'm going back to not indented - I think this is a working [[patch]] taking into
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account all comments above (which doesn't mean it is above reproach :) ). --[[Will]]
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> Very belated code review of last version of the patch:
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>
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> * `is_globlist` is no longer needed
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> * I don't understand why the pagespec match regexp is changed
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> from having flags `igx` to `ixgs`. Don't see why you
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> want `.` to match '\n` in it, and don't see any `.` in the regexp
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> anyway?
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> * Some changes of `@_` to `%params` in `pagespec_makeperl` do not
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> make sense to me. I don't see where \%params is defined and populated,
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> except with `\$params{specFunc}`.
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> * Seems that the only reason `match_glob` has to check for `~` is
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> because when a named spec appears in a pagespec, it is translated
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> to `match_glob("~foo")`. If, instead, `pagespec_makeperl` checked
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> for named specs, it could convert them into `check_named_spec("foo")`
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> and avoid that ugliness.
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> * The changes to `match_link` seem either unecessary, or incomplete.
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> Shouldn't it check for named specs and call
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> `check_named_spec_existential`?
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> * Generally, the need to modify `match_*` functions so that they
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> check for and handle named pagespecs seems suboptimal, if
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> only because there might be others people may want to use named
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> pagespecs with. It would be possible to move this check
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> to `pagespec_makeperl`, by having it check if the parameter
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> passed to a pagespec function looked like a named pagespec.
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> The only issue is that some pagespec functions take a parameter
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> that is not a page name at all, and it could be weird
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> if such a parameter were accidentially interpreted as a named
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> pagespec. (But, that seems unlikely to happen.)
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> * I need to check if your trick to avoid infinite recursion
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> works if there are two named specs that recursively
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> call one-another. I suspect it does, but will test this
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> myself..
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>
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> --[[Joey]]
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----
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diff --git a/IkiWiki.pm b/IkiWiki.pm
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index 4e4da11..8b3cdfe 100644
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--- a/IkiWiki.pm
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+++ b/IkiWiki.pm
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@@ -1550,7 +1550,16 @@ sub globlist_to_pagespec ($) {
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sub is_globlist ($) {
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my $s=shift;
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- return ( $s =~ /[^\s]+\s+([^\s]+)/ && $1 ne "and" && $1 ne "or" );
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+ return ! ($s =~ /
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+ (^\s*
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+ [^\s(]+ # single item
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+ (\( # possibly with parens after it
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+ ([^)]* # with stuff inside those parens
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+ (\([^)]*\))*)* # maybe even nested parens
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+ \))?\s*$
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+ ) |
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+ (\s and \s) | (\s or \s) # or we find 'and' or 'or' somewhere
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+ /xs);
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}
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sub safequote ($) {
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@@ -1631,7 +1640,7 @@ sub pagespec_merge ($$) {
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return "($a) or ($b)";
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}
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-sub pagespec_translate ($) {
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+sub pagespec_makeperl ($) {
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my $spec=shift;
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# Support for old-style GlobLists.
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@@ -1650,12 +1659,14 @@ sub pagespec_translate ($) {
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\) # )
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- \w+\([^\)]*\) # command(params)
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+ define\(\s*~\w+\s*,((\([^()]*\)) | ([^()]+))+\) # define(~specName, spec) - spec can contain parens 1 deep
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+ |
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+ \w+\([^()]*\) # command(params) - params cannot contain parens
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[^\s()]+ # any other text
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)
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\s* # ignore whitespace
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- }igx) {
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+ }igxs) {
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my $word=$1;
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if (lc $word eq 'and') {
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$code.=' &&';
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@@ -1666,16 +1677,23 @@ sub pagespec_translate ($) {
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elsif ($word eq "(" || $word eq ")" || $word eq "!") {
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$code.=' '.$word;
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}
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- elsif ($word =~ /^(\w+)\((.*)\)$/) {
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+ elsif ($word =~ /^define\(\s*~(\w+)\s*,(.*)\)$/s) {
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+ $code .= " (\$params{specFuncs}->{$1}="; # (exists \$params{specFuncs}) &&
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+ $code .= "memoize(";
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+ $code .= &pagespec_makeperl($2);
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+ $code .= ")";
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+ $code .= ") ";
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+ }
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+ elsif ($word =~ /^(\w+)\((.*)\)$/s) {
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if (exists $IkiWiki::PageSpec::{"match_$1"}) {
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- $code.="IkiWiki::PageSpec::match_$1(\$page, ".safequote($2).", \@_)";
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+ $code.="IkiWiki::PageSpec::match_$1(\$page, ".safequote($2).", \%params)";
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}
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else {
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$code.=' 0';
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}
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}
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else {
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- $code.=" IkiWiki::PageSpec::match_glob(\$page, ".safequote($word).", \@_)";
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+ $code.=" IkiWiki::PageSpec::match_glob(\$page, ".safequote($word).", \%params)";
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}
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}
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@@ -1683,8 +1701,18 @@ sub pagespec_translate ($) {
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$code=0;
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}
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+ return 'sub { my $page=shift; my %params = @_; '.$code.' }';
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+}
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+
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+sub pagespec_translate ($) {
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+ my $spec=shift;
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+
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+ my $code = pagespec_makeperl($spec);
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+
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+ # print STDERR "Spec '$spec' generated code '$code'\n";
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+
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no warnings;
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- return eval 'sub { my $page=shift; '.$code.' }';
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+ return eval $code;
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}
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sub pagespec_match ($$;@) {
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@@ -1699,7 +1727,7 @@ sub pagespec_match ($$;@) {
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my $sub=pagespec_translate($spec);
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return IkiWiki::FailReason->new("syntax error in pagespec \"$spec\"") if $@;
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- return $sub->($page, @params);
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+ return $sub->($page, @params, specFuncs => {});
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}
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sub pagespec_valid ($) {
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@@ -1748,11 +1776,78 @@ sub new {
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package IkiWiki::PageSpec;
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+sub check_named_spec($$;@) {
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+ my $page=shift;
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+ my $specName=shift;
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+ my %params=@_;
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+
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+ error("Unable to find specFuncs in params to check_named_spec()!") unless exists $params{specFuncs};
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+
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+ my $specFuncsRef=$params{specFuncs};
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+
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+ return IkiWiki::FailReason->new("Named page spec '$specName' is not valid")
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+ unless (substr($specName, 0, 1) eq '~');
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+
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+ $specName = substr($specName, 1);
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+
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+ if (exists $specFuncsRef->{$specName}) {
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+ # remove the named spec from the spec refs
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+ # when we recurse to avoid infinite recursion
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+ my $sub = $specFuncsRef->{$specName};
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+ delete $specFuncsRef->{$specName};
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+ my $result = $sub->($page, %params);
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+ $specFuncsRef->{$specName} = $sub;
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+ return $result;
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+ } else {
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+ return IkiWiki::FailReason->new("Page spec '$specName' does not exist");
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+ }
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+}
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+
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+sub check_named_spec_existential($$$;@) {
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+ my $page=shift;
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+ my $specName=shift;
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+ my $funcref=shift;
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+ my %params=@_;
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+
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+ error("Unable to find specFuncs in params to check_named_spec_existential()!") unless exists $params{specFuncs};
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+ my $specFuncsRef=$params{specFuncs};
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+
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+ return IkiWiki::FailReason->new("Named page spec '$specName' is not valid")
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+ unless (substr($specName, 0, 1) eq '~');
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+ $specName = substr($specName, 1);
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+
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+ if (exists $specFuncsRef->{$specName}) {
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+ # remove the named spec from the spec refs
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+ # when we recurse to avoid infinite recursion
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+ my $sub = $specFuncsRef->{$specName};
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+ delete $specFuncsRef->{$specName};
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+
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+ foreach my $nextpage (keys %IkiWiki::pagesources) {
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+ if ($sub->($nextpage, %params)) {
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+ my $tempResult = $funcref->($page, $nextpage, %params);
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+ if ($tempResult) {
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+ $specFuncsRef->{$specName} = $sub;
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+ return $tempResult;
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+ }
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+ }
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+ }
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+
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+ $specFuncsRef->{$specName} = $sub;
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+ return IkiWiki::FailReason->new("No page in spec '$specName' was successfully matched");
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+ } else {
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+ return IkiWiki::FailReason->new("Named page spec '$specName' does not exist");
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+ }
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+}
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+
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sub match_glob ($$;@) {
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my $page=shift;
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my $glob=shift;
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my %params=@_;
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+ if (substr($glob, 0, 1) eq '~') {
|
|
+ return check_named_spec($page, $glob, %params);
|
|
+ }
|
|
+
|
|
my $from=exists $params{location} ? $params{location} : '';
|
|
|
|
# relative matching
|
|
@@ -1782,11 +1877,12 @@ sub match_internal ($$;@) {
|
|
|
|
sub match_link ($$;@) {
|
|
my $page=shift;
|
|
- my $link=lc(shift);
|
|
+ my $fulllink=shift;
|
|
my %params=@_;
|
|
+ my $link=lc($fulllink);
|
|
|
|
my $from=exists $params{location} ? $params{location} : '';
|
|
-
|
|
+
|
|
# relative matching
|
|
if ($link =~ m!^\.! && defined $from) {
|
|
$from=~s#/?[^/]+$##;
|
|
@@ -1804,19 +1900,32 @@ sub match_link ($$;@) {
|
|
}
|
|
else {
|
|
return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
|
|
- if match_glob($p, $link, %params);
|
|
+ if match_glob($p, $fulllink, %params);
|
|
}
|
|
}
|
|
return IkiWiki::FailReason->new("$page does not link to $link");
|
|
}
|
|
|
|
sub match_backlink ($$;@) {
|
|
- return match_link($_[1], $_[0], @_);
|
|
+ my $page=shift;
|
|
+ my $backlink=shift;
|
|
+ my @params=@_;
|
|
+
|
|
+ if (substr($backlink, 0, 1) eq '~') {
|
|
+ return check_named_spec_existential($page, $backlink, \&match_backlink, @params);
|
|
+ }
|
|
+
|
|
+ return match_link($backlink, $page, @params);
|
|
}
|
|
|
|
sub match_created_before ($$;@) {
|
|
my $page=shift;
|
|
my $testpage=shift;
|
|
+ my @params=@_;
|
|
+
|
|
+ if (substr($testpage, 0, 1) eq '~') {
|
|
+ return check_named_spec_existential($page, $testpage, \&match_created_before, @params);
|
|
+ }
|
|
|
|
if (exists $IkiWiki::pagectime{$testpage}) {
|
|
if ($IkiWiki::pagectime{$page} < $IkiWiki::pagectime{$testpage}) {
|
|
@@ -1834,6 +1943,11 @@ sub match_created_before ($$;@) {
|
|
sub match_created_after ($$;@) {
|
|
my $page=shift;
|
|
my $testpage=shift;
|
|
+ my @params=@_;
|
|
+
|
|
+ if (substr($testpage, 0, 1) eq '~') {
|
|
+ return check_named_spec_existential($page, $testpage, \&match_created_after, @params);
|
|
+ }
|
|
|
|
if (exists $IkiWiki::pagectime{$testpage}) {
|
|
if ($IkiWiki::pagectime{$page} > $IkiWiki::pagectime{$testpage}) {
|