Unusedtitle Macro and Text Substitution

[Mohammad]

I have a procedure called create-item. It is used to create new tiddler with specific fields, etc.

\whitespace trim
\procedure full-path() $:/state
\function base-title() [<full-path>] [<type>] [<title>] :and[join[/]]

\procedure create-item(btncaption:"new item", type, title, tags)
<$button> <<btncaption>>
	<$action-sendmessage $message="tm-new-tiddler" title=`${[<unusedtitle $(base-title)$>]}$` tags=<<tags>> />
</$button>
\end


<<create-item "My New Test" type:"macros" title:"mac" tags:"$:/tags/Macro">>

But the unusedtitle does not work correctly and does not increment the title. It always create a new tiddler with

$:/state/macros/mac

Is this a bug?

[saqimtiaz]

From the docs:

Filter expression placeholders are substituted before variable placeholders, allowing for further variable substitution in their returned value.

Your code assumes that the variable will be substituted before the filter expression is evaluated.

[Mohammad]

Thank you Saq,
So do I have to go through $wikify? I try to not use macro!

[Mohammad]

I think @pmario has given a good example here:

Use Unusedtitle-, Now-macro to Dynamically Define a Unique Name to use With ActionCreateTiddlerWidget

It’s a bit tricky since we do have a core <<unusedtitlemacro which has 3 parameters and the first one should be a <<now macro call. Nesting macros is tricky. So in this case the $wikify-widget is a possibility to create some readable code. We use the new text substitution option for widget parameters, to create the unusedtitle-macro-string, that can be wikified by the wikify-widget We start with a function: \function utNow() [<now "YYYY0MM0DD">] to get the <<now macro out fo the way. It w…

[Mohammad]

In the above answer, @pmario used $wikify. I tried to avoid them (macro and $wikify) and I arrived to this ugly but working solution:

\whitespace trim
\procedure full-path() $:/state


\procedure create-item(btncaption:"new item", type, title, tags)
<$let base-title= {{{ [<full-path>] [<type>] [<title>] :and[join[/]]      }}}
      new-title=  {{{ "[<unusedtitle $(base-title)$>]" :and[substitute[]] }}} >
<$button> <<btncaption>>
	<$action-sendmessage $message="tm-new-tiddler" title={{{ [subfilter<new-title>] }}}  tags=<<tags>> />
</$button>
</$let>
\end


<<create-item "My New Test" type:"macros" title:"mac" tags:"$:/tags/Macro">>

Any simpler, shorter solution not using $wikify?