Pablo Rodriguez via ntg-context schrieb am 28.02.2024 um 19:02:
On 2/28/24 12:24, Pablo Rodriguez via ntg-context wrote:
[...]
This is why beforequadruple would make sense. I guess some Lua magic
could do that, computing x to the follwing page that "x % 4 = 3" (and
then \page[x]).
I will try to find a trick for that, but not now.
Replying to myself, this is a command to compute next numbers before and
after quadruples (with application to \realpageno):
\starttext
\def\beforequadruplenumber#1%
{\ifnum\modulonumber{4}{#1} = 1
\the\numexpr #1 + 2
\orelse\ifnum\modulonumber{4}{#1} = 2
\the\numexpr #1 + 1
\orelse\ifnum\modulonumber{4}{#1} = 3
\the\numexpr #1 + 4
\else
\the\numexpr #1 + 3
\fi}
\def\beforequadruplenumber#1%
{\ifcase\numexpr#1+1;4\relax
\number\numexpr#1+4\relax
\else
\number\numexpr#1+3-#1;4\relax
\fi}
\def\afterquadruplenumber#1%
{\ifnum\modulonumber{4}{#1} = 1
\the\numexpr #1 + 4
\orelse\ifnum\modulonumber{4}{#1} = 2
\the\numexpr #1 + 3
\orelse\ifnum\modulonumber{4}{#1} = 3
\the\numexpr #1 + 2
\else
\the\numexpr #1 +1
\fi}
\def\afterquadruplenumber#1%
{\ifcase\numexpr#1;4\relax
\number\numexpr#1+1\relax
\else
\number\numexpr#1+5-#1;4\relax
\fi}
Wolfgang
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