lua args or how to identify the interpreter

lua args or how to identify the interpreter

[Philipp Gesang]

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Hi all,

what would be an elegant way to make out the current interpreter from inside
lua?

For now I'm branching things at the top of the script like this:

···8<··········································································
if arg[-1] == "texlua" then
    utf=unicode.utf8
else
    require "lpeg"
    utf=string
end
···8<··········································································

because I have neither slnunicode nor a built-in lpeg on my system's lua
installation. The problem is that luatex has arg[-1] == nil but arg[0]
== "luatex", and context sets all args to nil, so my crude way of
determining the interpreter by cl args fails with both.

I tried something like "local string = utf or string" as well, but this works
only in context which has utf==unicode.utf8 or something.

Thanks for your help

Philipp

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___________________________________________________________________________________
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Re: lua args or how to identify the interpreter

[Hans Hagen]

On 22-7-2010 11:51, Philipp Gesang wrote:
> Hi all,
>
> what would be an elegant way to make out the current interpreter from inside
> lua?
>
> For now I'm branching things at the top of the script like this:
>
> ···8<··········································································
> if arg[-1] == "texlua" then
>      utf=unicode.utf8
> else
>      require "lpeg"
>      utf=string
> end
> ···8<··········································································

if you run your script with mtxrun then you can ask for arguments using

environment.argument
environment.files



-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: lua args or how to identify the interpreter

[Philipp Gesang]

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On 2010-07-22 <11:55:38>, Hans Hagen wrote:
> On 22-7-2010 11:51, Philipp Gesang wrote:
> >Hi all,
> >
> >what would be an elegant way to make out the current interpreter from inside
> >lua?
> >
> >For now I'm branching things at the top of the script like this:
> >
> >···8<··········································································
> >if arg[-1] == "texlua" then
> >     utf=unicode.utf8
> >else
> >     require "lpeg"
> >     utf=string
> >end
> >···8<··········································································
> 
> if you run your script with mtxrun then you can ask for arguments using
> 
> environment.argument
> environment.files

Hi Hans,

thank you, I was rather looking for some unified way of identifying the
lua interpreter that would work with the 4 machines I mentioned. Nevermind,
individually testing, while it does not really look good, works fine:

···8<··········································································
if context then
  interp = "context"
elseif arg[0] == "luatex" then
  interp = "luatex"
elseif arg[-1] == "texlua" then
  interp = "texlua"
else
  interp = "plainlua"
end
···8<··········································································


> 
> 
> 
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
> -----------------------------------------------------------------
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________