After some efforts I stumbled upon this solution for a macro which displays
a tiddler link if the contact tiddler exists and a button to create one if
it does not. Please have a look and let me know if this is actually a
proper way to do it or should i be doing in some other way:
\define contact(name)
<$list filter="[title[$name$]is[missing]]">
<$button>
<$action-createtiddler
$basetitle='$name$'
tags='contact'
address=''
phone=''
email=''
reference=''
birthday=''
$savetitle={{ContactMacro!!newContact}}
/>
<$action-sendmessage $message="tm-edit-tiddler" $param={{ContactMacro!!
newContact}}/>
create $name$
</$button>
</$list>
<$list filter="[title[$name$]is[tiddler]]">
[[$name$]]</$list>
\end
My concerns and confusion is:
1. It seems that list widget is being used for something other than what it
is supposed to be used for. It is meant for producing lists, whereas here
it is being used as a mode for implementing a check. Isn't this a hackish,
non-standard way?
2. I could not find any way to implement an if-then-else logic. Is this so,
that it is not possible using provided widgets?
3. Lastly how do I implement AND and OR filters in a list widget?
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