On Tue, 13 Oct 2020, Pablo Rodriguez wrote:
> Dear list,
>
> I have the following sample:
>
> \starttext
> \def\numbersfname
> {\cldcontext{string.match([[\env{fname}]], "\letterpercent d+")}}
> \ctxlua{ c = context.getvariable("environment", "fname") or "a" }
> \ctxlua{ d = [[\env{fname}]] }
>
> tex: \numbersfname\\
> \doifelse{}
> {123}{yes}{no}\\
> c: \cldcontext{c}\\
> \doifelse{\cldcontext{c:match("\letterpercent d+")}}
> {123}{yes}{no}\\
> d: \cldcontext{d}\\
> \doifelse{\cldcontext{d:match("\letterpercent d+")}}
> {123}{yes}{no}
> \stoptext
>
> For compilation, I run the command:
>
> context --purgeall --arguments=fname={abc123} test-file.tex
>
> These things are failing:
>
> 1. I don’t know how to get \numbersfname equal to "123". I don’t know
> what I’m doing wrong.
>
> 2. Is there no Lua version of \getvariable{...}{...}?
>
> 3. I’m trying this on a Linux box, but on Windows I would say that Lua
> variable "d" is empty.
>
> I need to get the number from \env{fname} and I don’t know what I’m
> missing. \doif is the way to test whether it’s right.
>
> Could anyone explain me what I’m missing here?
I find it simpler to write macros where there is clean communicating between
tex and lua. For example:
\startluacode
userdata = userdata or {}
function userdata.numbersfname(name)
return string.match(name, "%d+")
end
\stopluacode
\define[1]\numbersfname
{\cldcontext{userdata.numbersfname([==[#1]==])}}
\starttext
\numbersfname{abc123}
\numbersfname{\env{fname}}
\stoptext
Aditya___________________________________________________________________________________
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