Re: [NTG-context] check installed program using Lua

1 Nov 2021


      On 11/1/2021 2:26 PM, Pablo Rodriguez via ntg-context wrote:
...
Dear list,
is there a way if a program is installed on the computer using Lua.
I have the following sample:
\starttext
   \startluacode
   filename = tex.jobname .. ".pdf"
   os.exec("dir " .. filename)
   \stopluacode
   \stoptext
Is there a way to wrap os.exec() in the sample so that it only runs if
"dir" is available?
I know that os.name would be an option here, but not in my real world
document.
\starttext
   \startluacode
     if lfs.isfile(tex.jobname .. ".pdf") then
         context("YES")
     end
     if lfs.isfile(file.addsuffix(environment.outputfilename,"pdf")) then
         context("YES")
     end
     if #dir.glob(file.addsuffix(environment.outputfilename,"pdf")) > 0 then
         context("YES")
     end
   \stopluacode
\stoptext

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