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From: Joel via ntg-context <ntg-context@ntg.nl>
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Subject: How to let a macro check the previous value of #1 the
 last time the same macro was called?
Date: Sun, 9 Jan 2022 14:16:37 +0000 (UTC)
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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 equa=
l to #1 from the last time the same macro was called:

=C2=A0=C2=A0=C2=A0 \define[1]\mymacro{
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \if\previousvalue=3D#1
=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0same as last time
=C2=A0=C2=A0 =C2=A0\else
=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0it is different from last time
=C2=A0=C2=A0 =C2=A0\fi
=C2=A0=C2=A0=C2=A0 }

\starttext

=C2=A0=C2=A0=C2=A0 \mymacro{cat}
=C2=A0=C2=A0=C2=A0 \mymacro{cat}
=C2=A0=C2=A0=C2=A0 \mymacro{mouse}
=C2=A0=C2=A0=C2=A0 \mymacro{mouse}
=C2=A0=C2=A0=C2=A0 \mymacro{cat}

\stoptext

This would print:

=C2=A0=C2=A0=C2=A0 it is different from last time <--it was never called pr=
eviously
=C2=A0=C2=A0=C2=A0 same as last time
=C2=A0=C2=A0=C2=A0 it is different from last time
=C2=A0=C2=A0=C2=A0 same as last time
=C2=A0=C2=A0=C2=A0 it is different from last time

--Joel

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<html><head></head><body><div class=3D"yahoo-style-wrap" style=3D"font-fami=
ly:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:10px;"><div><div>=
Is there a way for a macro to check the previous value of #1, the last time=
 that same macro was called?<br><br>Here is a minimum working example, pret=
ending that `\previousvalue` is equal to #1 from the last time the same mac=
ro was called:<br><br>&nbsp;&nbsp;&nbsp; \define[1]\mymacro{<br>&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \if\previousvalue=3D#1<br>&nbsp;&nbsp; &nbs=
p;&nbsp;&nbsp; &nbsp;same as last time<br>&nbsp;&nbsp; &nbsp;\else<br>&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;it is different from last time<br>&nbsp;&n=
bsp; &nbsp;\fi<br>&nbsp;&nbsp;&nbsp; }<br><br>\starttext<br><br>&nbsp;&nbsp=
;&nbsp; \mymacro{cat}<br>&nbsp;&nbsp;&nbsp; \mymacro{cat}<br>&nbsp;&nbsp;&n=
bsp; \mymacro{mouse}<br>&nbsp;&nbsp;&nbsp; \mymacro{mouse}<br>&nbsp;&nbsp;&=
nbsp; \mymacro{cat}<br><br>\stoptext<br><br>This would print:<br><br>&nbsp;=
&nbsp;&nbsp; it is different from last time &lt;--it was never called previ=
ously<br>&nbsp;&nbsp;&nbsp; same as last time<br>&nbsp;&nbsp;&nbsp; it is d=
ifferent from last time<br>&nbsp;&nbsp;&nbsp; same as last time<br>&nbsp;&n=
bsp;&nbsp; it is different from last time<br><br>--Joel</div><br></div></di=
v></body></html>
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