I put in a pull request to update the variables in wikitext tiddler that
adds examples of when $(name)$ <<name>> and <name> are used.
>From what I understand you use $(var)$ when you set a variable outside of a
macro and then use that variable in the macro and <<var>> is for setting a
variable and using it outside a macro. In both of these cases adding quotes
returns the variable value surrounded by quotes. so
<$set name='var' value='someValue'>
<<var>> "<<var>>"
</$set>
gives: someValue "someValue". <<var>> acts the same inside a macro as
outside, and if the value is set as a filter it can be used as a filter.
<var> in wikitext it parsed as an html tag from what I can tell, so it
breaks things and doesn't display as anything. Adding quotes ("<var>") is
the same as putting quotes around any tag where it displays quotes.
Variable names called by $var$ and "$var$" are just strings so they are
displayed like any other string without any substitution, inside or outside
a macro.
In [[<var>]], <var> is treated as a string, so that would create a link to
a tiddler with the title <var>
The times when <var> DOES work is in a situation like this:
<$set name='var' value='someTag'>
<$list filter='[tag<var>]'/>
</$set>
which lists tiddlers tagged with someTag. This should work inside or
outside a macro. Using '[tag[$(var)$]]' as a filter anywhere gives the
tiddlers that are tagged with $(var)$ without any substitution.
As for parameters passed to a macro the only options you have that are not
treated as strings (so no substitution, and [[<param>]] links to the
tiddler with title <param>) are $param$ and "$param$" in both cases the
input is substituted for $param$ without any weirdness.
So
\define macroThing(param)
[[$param$]]
\end
<<macroThing HelloThere>>
displays a link to the tiddler HelloThere.
I think that a significant amount of weirdness comes in when you have
things like this:
<$set name='someVar' value={{!!title}}>
Where "<<someVar>>" gives "HelloThere" if you are in the HelloThere
tiddler, but calling a macro with <<macroName "<<someVar>>">> gets parsed
as calling macroName with the input "<<someVar treated as a string. This is
why you use $(someVar)$ inside the macro to reference the variable.
Passing something like {{!!title}} as the input to a macro can be strange
because in that case it isn't evaluated, it is straight text substitution.
So this code:
\define someMacro(input)
<$list filter='[tag[$input$]]'/>
\end
<<someMacro {{!!title}}>>
returns a list of tiddlers tagged {{!!title}} with no substitution, but if
you use this
\define someMacro()
<$list filter='[tag[$(input)$]]'/>
\end
<$set name='input' value={{!!title}}>
<<someMacro>>
</$set>
you get a list of all tiddlers tagged with the current tiddler.
I am not sure if any of that made sense, but I am pretty sure it is all
correct.
On Tuesday, November 18, 2014 12:32:02 PM UTC-7, Tobias Beer wrote:
>
> Is there any way on how to achieve something like this...
>
> <$link to="*$:/language/Docs/Fields/{{!!title}}*">{{!!title}}</$link>
>
> ?
>
> Best wishes, Tobias.
>
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