Hi Alex,
No idea how to do it with the core but
you can use tobibeer/make <http://tobibeer.github.io/tw5-plugins/#make>
with tobibeer/setvars <http://tobibeer.github.io/tw5-plugins/#setvars> to
achieve the desired result:
<$setvars
_make="[[]make[{{!!customer}}, {{!!period-name}}]]"
new-title="[make[1][][]]">
<$button message="tm-new-tiddler" param=<<new-title>>>New Invoice</$button>
</$setvars>
Demystified:
- [make[1][][]]
- evaluate the attribute _make and...
- retrieve the first item
- not specifying any empty value (because it's never going to be
empty)
- joining all items to a string without any separator
- [[]make[{{!!customer}}, {{!!period-name}}]]
- create a unique title based on the *customer* and *period-name* fields
of the current tiddler
You can also use the *make* filter to create a unique, zero-padded invoice
number that is unique among all invoices.
Best wishes,
Tobias.
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