Is there a way for a macro to check the previous value of #1, the last time
that same macro was called?
Here is a minimum working example, pretending that `\previousvalue` is equal to
#1 from the last time the same macro was called:
\define[1]\mymacro{
\if\previousvalue=#1
same as last time
\else
it is different from last time
\fi
}
\starttext
\mymacro{cat}
\mymacro{cat}
\mymacro{mouse}
\mymacro{mouse}
\mymacro{cat}
\stoptext
This would print:
it is different from last time <--it was never called previously
same as last time
it is different from last time
same as last time
it is different from last time
--Joel
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