Hello,
I have solved a problem that I had. But it seems to be to be an inelegant
solution where maybe I am missing something.
I wanted to take a field from a tiddler and use it as a part of a filter
expression within the same tiddler. I tried a ton of different method to
find a solution but it seemed that no matter what I tried (quotes, no
quotes, <$set>$(variables)$, <<macros>>, <$transculsions>,
{{!!transclusions}}, etc.), it all seemed to break the parsing of the
filter expression (resulting in a table of gibberish) or didn't match the
expression I wanted since it didn't evaluate the variable (leading to a
table of nothing).
So in the end, I took the brute force method of building up a filter
expression using a custom concatenation macro of a boiler-plate filter
prefix, the field that I wanted to slip in and a boiler-plate filter
suffix. The resulting simplified, generalized code is:
\define filtertransclude(t1,t2,t3)
$t1$$t2$$t3$
\end
<table>
<tr>
<th>Table Header</th>
</tr>
<$set name="field_variable" value={{!!field_of_interest}}>
<$list filter=<<filtertransclude "[!has[draft.of]tag[tag_of_interest]field:
field_of_interest[" "$(field_variable)$" "]sort[]]">>>
<tr><td><$link to={{!!title}}><$view field="name"/></$link></td></tr>
</$list>
</$set>
</table>
This builds a table in a tiddler (assuming there are matching tiddlers with
the tag "tag_of_interest" and the field "field_of_interest" containing the
same value as that in the current tiddler) using a filter controlled by a
field value in the tiddler rather than having to hand-edit the filter
expression.
My reasoning for posting this is two-fold. To help anyone who has come
across this issue. Also, to see if I am missing something fundamental about
using variables and macros in filter expressions from those who are
TiddlyWiki gurus. I learn a lot every time I post a solution to someone's
problem so I hope that I can do so again by posing the solution to my own :]
/Mike
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