On Sat, Nov 13, 2021 at 12:19:09PM -0500, Peter Schaffter wrote:
> On Sat, Nov 13, 2021, Ulrich Lauther wrote:
> > Is there a trick to make a macro or string return a value?
> <snip>
> > The only solution I found looks like this:
> >
> > .de Pos END
> > .nr foo (\\n[.d]u-\\[.v]u)*254+1)/72000
> > \\n[foo] mm/10
> > .END
> >
> > .fi
> > position: \n[.d] units,
> > .Pos
>
> .nr foo has an error -- s/b \\n[.v] -- and the u scaling indicators
> are superfluous. Fixed, the macro could be written
>
> .de Pos
> \R'foo (\\n[.d]-\\n[.v]*254+1)/72000'\\n[foo]mm/10
> ..
>
> which allows you to enter
>
> position: \n[.d] units, \*[Pos].
>
Wow! Works nicely.
But why is "R" escaped only once? \\R works too.
And I had to add a line ".sp -1v" at the end of the macro; otherwise I get a
blank line after position: ...
ulrich
