[NTG-context] Can ConTeXt write its pdf to a different directory?

[Max Chernoff via ntg-context <ntg-context@ntg.nl>]

Hi Peter,

> My .tex file is in a directory within my working directory. I would like 
> ConTeXt to write its output in the same directory as my .tex file. But it 
> writes to the working directory.
> 
> This was asked 10 years ago:
> `tex.stackexchange.com/questions/67928/how-to-set-output-directory-in-context-command`
> 
> The answer given then was to use:
> `context filename --result=output-directory/filename`
> 
> But this doesn't work now. When I compile my .tex file, I get a message:
> `results are to be on the running path, not on 'output-directory', ignoring 
> --result`

This seems to work, although I'm not sure that I would call it a "good"
solution:

   \startluacode
       local function absolute(path)
           return file.collapsepath(dir.expandname(path))
       end
   
       local texfile = absolute(environment.filename)
       local pdffile = file.addsuffix(
           absolute(environment.inputfilebarename),
           "pdf"
       )
   
       luatex.wrapup(function()
           os.rename(pdffile, file.replacesuffix(texfile, "pdf"))
       end)
   \stopluacode
   
   \starttext
       Hello!
   \stoptext

-- Max
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