Pablo Rodriguez schrieb am 09.10.2020 um 15:58:
Dear list,
I have the following sample:
\starttext
\startluacode
function document.starts_with(str, start)
if str:sub(1, #start) == start then
context(start)
end
end
\stopluacode
\unexpanded\def\startswith[#1][#2]
{\cldcontext{document.starts_with("#1", "#2")}}
You need a % at the end of the definition, otherwise TeX expects a space
after the second argument to end the command.
\unexpanded\def\startswith[#1][#2]%
{...}
To improve your command and allow a space between both arguments you can use
\unexpanded\def\startswith
{\dodoubleargument\dostartswith}
\def\dostartswith[#1][#2]%
{...}
or just add a dummy parameter and use #1 and #3 to pass the arguments
\unexpanded\def\startswith[#1]#2[#3]%
{...}
Wolfgang
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