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