Here's an approach which doesn't require assembling an intermediate list.
Like my last example, this is most easily demonstrated by creating a new
tiddler on TiddlyWiki.com and previewing it.
\define heirarchy_sub()
<$list filter="[tag{!!title}]">
<li> <$link>{{!!title}}</$link> </li>
<ul>
<$macrocall $name="heirarchy_sub">>
</ul>
</$list>
\end
\define heirarchy(ROOT)
<$tiddler tiddler="$ROOT$"><<heirarchy_sub>></$tiddler>
\end
<ul>
<<heirarchy "TableOfContents">>
</ul>
On Sunday, 13 September 2015 12:44:05 UTC-5, Evan Balster wrote:
>
> 2) The reason for this behavior is that macros do not set variables.
> They're a text replacement system, and widgets (like <$list> or <$set>)
> are not run until the macro has been applied. $(variable)$ is a
> substitution that happens within the macro, while <<variable>> happens
> after. These subtleties can make TiddlyWiki programming a bit of a
> headache at times.
>
> 3) A good way to debug filter generation is to use a <$text> widget,
> which will display the output of a macro without further parsing. IE, it
> will use the same rule to display the result of a macro as would be used if
> that macro was used as a filter.
>
> As a test, I made a few small modifications to your code and pasted the
> following into a new tiddler on TiddlyWiki.com:
>
> \define listDescendants(tag)
> [[$tag$]]
>
> <$list filter="[tag[$tag$]]">
> [[<$view field="title" />]]
> <$macrocall $name="listDescendants" tag=<<currentTiddler>> />
> </$list>
> \end
>
> \define myMacro()
>
> <$set name="myList" value=<<listDescendants "HelloThere">> >
> <$set name="finalFilter" value=<<assembleFilter>> >
>
> <<<
> <$text text=<<finalFilter>>/>
> <<<
>
> <<myMacro2>>
> </$set>
> </$set>
> \end
>
> \define assembleFilter()
> $(myList)$
> \end
>
> \define myMacro2()
> <$list filter=<<finalFilter>> >
> <<showListItem>>
> </$list>
> \end
>
> \define showListItem()
> » <$link to={{!!title}}><$view field="caption" ><$view field="title"
> /></$view></$link><br>
> \end
>
> <<myMacro>>
>
>
> The output of that includes a bunch of garbage information, and a listing
> of the tiddlers which are direct descendants of the "root concept". The
> reason is that the filter you're generating, as indicated by the Text
> widget, is this:
>
> [[HelloThere]] <$list filter="[tag[HelloThere]]">
> [[<$view field="title" />]] <$macrocall
> $name="listDescendants" tag=<<currentTiddler>> /> </$list>
>
> All of that goes into the filter parser, which interprets everything other
> than [tag[HelloThere]] as a tiddler to be included in the list. The
> <$list> widget is not executed beforehand. Because none of those junk
> tiddlers exist with a tag "concept", you don't see them when running your
> own code. The children of HelloThere show up as normal, however.
>
> See the attached screenshot, showing what the rendered page (with all junk
> tiddlers) looks like.
>
> The take-away from all this is that there is *no wikification* of text
> that gets fed into attributes such as filters -- TiddlyWiki would need
> additional
> functionality
> <https://groups.google.com/d/topic/tiddlywiki/E_JbL_5TGyY/discussion> for
> this to be possible. It's another conceptual headache with the relation
> between macros and widgets that took me a long time to understand.
>
> If you want to do what you're trying to do, you'll probably need to start
> over with a technique that doesn't involve generating a filter or list.
> Try just printing the name of each item in your heirarchy individually.
>
>
> On Sunday, 13 September 2015 03:49:13 UTC-5, Linus Johnsson wrote:
>>
>> Through your suggestions I have made at least some progress. Given the
>> code
>>
>> \define listDescendants(tag)
>> [[$tag$]]
>> <$list filter="[tag[$tag$]tag[concepts]]">
>> [[<$view field="title" />]]
>> <$macrocall $name="listDescendants" tag=<<currentTiddler>> />
>> </$list>
>> \end
>>
>> \define myMacro()
>> <$set name="myList" value=<<listDescendants "NameOfConceptTiddler">> >
>> <$set name="finalFilter" value=<<assembleFilter>> >
>> <<myMacro2>>
>> </$set>
>> </$set>
>> \end
>>
>> \define assembleFilter()
>> $(myList)$ +[tagging[]tag[memos]]
>> \end
>>
>> \define myMacro2()
>> <$list filter=<<finalFilter>> >
>> <<showListItem>>
>> </$list>
>> \end
>>
>> \define showListItem()
>> » <$link to={{!!title}}><$view field="caption" ><$view
>> field="title" /></$view></$link><br>
>> \end
>>
>> <<myMacro>>
>>
>> I do get a list of memos tagged with concepts in the tree that I am
>> traversing, but strangely enough it does not include those tagged only with
>> the ancestor. Any ideas?
>>
>> @Evan, some comments on your notes:
>>
>> 1) Check.
>>
>> 2) It appears that $(variable)$ does not always work inside macros
>> either. For instance, given that finalFilter is a variable defined in the
>> enclosing macro myMacro2,
>>
>> \define myMacro2()
>> <$list filter=<<finalFilter>> >
>> <<showListItem>>
>> </$list>
>> \end
>>
>> works, while
>>
>> \define myMacro2()
>> <$list filter=$(finalFilter)$ >
>> <<showListItem>>
>> </$list>
>> \end
>>
>> does not.
>>
>> 3) Using <$set> as in the above example appears to be a rather simple
>> workaround given the limitations of <$filter>.
>>
>>
>> Best regards,
>> Linus
>>
>>
>>
>> 2015-09-12 19:17 GMT+02:00 Evan Balster <balste...@gmail.com>:
>>
>>> A few notes:
>>>
>>> 1) Macros always have to be at the top of the file, before any WikiText.
>>>
>>> 2) The syntax $(variable)$ only applies inside macros. Outside macros,
>>> use <<variable>>.
>>>
>>> 3) Your trick isn't working because there's no way to *render* WikiText
>>> into a filter expression. Basically, the code inside <<myList>> doesn't
>>> get executed if it's passed to an attribute like <$list filter=<<mylist>>
>>> >. I've just opened a topic suggesting a feature which would make this
>>> possible: read here
>>> <https://groups.google.com/d/topic/tiddlywiki/E_JbL_5TGyY/discussion>.
>>> That said, it's likely there are other ways to solve your problem which
>>> don't involve composing an intermediate list.
>>>
>>>
>>> On Saturday, 12 September 2015 05:42:35 UTC-5, Linus Johnsson wrote:
>>>
>>>> Thank you for your kind replies. Both suggestions rendered brackets
>>>> just fine. As you seem to have anticipated, this immediately landed me in
>>>> a
>>>> different kind of problem. I defined the following macro:
>>>>
>>>> \define listDescendants(tag)
>>>> <$list filter="[tag[$tag$]tag[concepts]]">
>>>> [[<$view field="title" />]]
>>>> <$macrocall $name="listDescendants" tag=<<currentTiddler>> />
>>>> </$list>
>>>> \end
>>>>
>>>> The macro works as intended. I do not understand, however, why the
>>>> following (trivial) examples will not reproduce the list returned by the
>>>> macro. I need to get this to work in order before I add filter runs. First,
>>>>
>>>> <$set name="myList" value=<<listDescendants "NameOfConceptTiddler">> >
>>>> <$list filter=<<myList>> />
>>>> </$set>
>>>>
>>>> returns the macro code itself, with the spaces between the tokens
>>>> removed. As for my second attempt,
>>>>
>>>> <$set name="myList" value=<<listDescendants "NameOfConceptTiddler">> >
>>>> <$list filter="$(myList)$" />
>>>> </$set>
>>>>
>>>> it just returns "$(myList)$".
>>>>
>>>> Wrapping the calling code in a macro does not work either:
>>>>
>>>> \define myMacro
>>>> <$set name="myList" value=<<listDescendants "NameOfConceptTiddler">> >
>>>> <$list filter=$(myList)$ />
>>>> </$set>
>>>> \end
>>>>
>>>> <<myMacro>>
>>>>
>>>> All I get is "\define myMacro $(myList)$ \end".
>>>>
>>>> I am thoroughly confused. Obviously there is something about the syntax
>>>> that I have not yet grasped. Please enlighten me!
>>>>
>>>> Best regards,
>>>> Linus
>>>>
>>>>
>>>> 2015-09-11 4:02 GMT+02:00 'c pa' via TiddlyWiki <
>>>> tiddl...@googlegroups.com>:
>>>>
>>>>> Linus,
>>>>>
>>>>> Ahhh, the old create a list and then parse it trick. I have done that
>>>>> before. I think what I ended up doing is storing the list in a temporary
>>>>> tiddler's list and then parsing that list to get the results
>>>>>
>>>>> You can use [ and ] to create square brackets
>>>>>
>>>>> So something like [[<$view field="title"/>]] will
>>>>> create the title
>>>>>
>>>>>
>>>>>
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