First problem first including pseudo code:
\define macro(foo)
<!-- if $foo$ ; begin --><$reveal type="nomatch" state=" non existing
tiddlre " text="$foo$">
do this
<!-- end --></$reveal>
<!-- else ; begin --><$reveal type="match" state=" non existing tiddlre "
text="$foo$">
<!-- if <<foo>> ; begin --><$reveal type="nomatch" state=" non existing
tiddlre " text="$(foo)$">
do that
<!-- end --></$reveal>
<!-- else ; begin --><$reveal type="match" state=" non existing tiddlre
" text="$(foo)$">
otherwise this
<!-- end --></$reveal>
<!-- end --></$reveal>
\end
! No Param, No Var
<<macro>>
! Param, No Var
<<macro "foo param">>
<$set name="foo" value="foo var">
! No Param, Var
<<macro>>
! Param, Var
<<macro "foo param">>
Note: Despite the fact that I used blanks as first and las character in the
stet tiddler's name, this does not keep help the " non existing tiddler "
from being created as the state tiddler's name gets trimmed by tiddlywiki.
So the whole logic will fail as soon as you have a non-empty tiddler called
"non existing tiddler".
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