On 9/3/2021 12:58 PM, Thierry Horsin via ntg-context wrote:

Hi everybody

Is there a way to have an automatic access to the current line number of a specific place inside a tex file ? To be more precise, here is what I would like to do.

I am currently trying to have some automatic external compilation by g++ of some portion of my tex file as in the following example below. \startC \stopC defines a framed part of text written between lines 538 and 549. Of course, if I add something before or inbetween my framed code, 538 and/or 549 will change. Thus I would like to get these two numbers automatically.

Thank you. Thierry

\startC #include <iostream>

using namespace std; int mysum(int,int); int a; int b; int main () { a=2; b=9; cout << mysum(a,b) << endl; return 0; } int mysum(int a, int b) { return a+b; } \stopC

\startluacode myout = io.open("test.cpp", "w") myin = io.open(tex.jobname..".tex", "r") local n=0 for line in myin:lines() do n=n+1 if n>539 and n<550 then myout:write(line.."\n") end end myout:close() myin:close() os.execute("g++ -o test test.cpp") os.execute("./test > tmp") local file=assert(io.open("tmp","r")) local t = file:read("*all") tex.print(t) \stopluacode in this case, thinking a bit different is easier ...

\starttext \startbuffer[MyBuffer] #include <iostream> using namespace std; int mysum(int,int); int a; int b; int main () { a=2; b=9; cout << mysum(a,b) << endl; return 0; } int mysum(int a, int b) { return a+b; } \stopbuffer We compile and run: \typebuffer[MyBuffer][option=C] \startluacode io.savedata("test.cpp",buffers.getcontent("MyBuffer")) --os.execute("g++ -o test test.cpp") --os.execute("./test > test.tmp") os.execute("echo done > test.tmp") buffers.assign("MyBuffer",io.loaddata("test.tmp")) \stopluacode And get: \typebuffer[MyBuffer] Or just: \typefile{test.tmp} \stoptext ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

On Fri, 3 Sep 2021, Thierry Horsin via ntg-context wrote:

Hi everybody

Is there a way to have an automatic access to the current line number of a specific place inside a tex file ? To be more precise, here is what I would like to do.

Also look at the filter module. https://github.com/adityam/filter Behind the scenes, it works by saving the content in an external file and then running it through any external program. It also allows for caching the result, and has many options for customizing the behavior. Aditya