Loading lua file.

Loading lua file.

[Andre Caldas]

If I load a lua file from a module using
\registerctxluafile{file}{1.001}
or
\ctxloadluafile{file}
How can I be sure the file was in fact loaded? Can I make ConTeXt halt
and issue an error in this case?


Cheers,
André Caldas.
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Re: Loading lua file.

[Philipp Gesang]

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Hey André,

···<date: 2012-12-12, Wednesday>···<from: Andre Caldas>···

> If I load a lua file from a module using
> \registerctxluafile{file}{1.001}
> or
> \ctxloadluafile{file}
> How can I be sure the file was in fact loaded?

The related tracker output is quite comprehensive:

    \enabletrackers[resolvers.locating]
    \ctxloadluafile{sometest}

it does not make Context terminate on fail, though.

>                                                Can I make ConTeXt halt
> and issue an error in this case?

the macros you cite don’t offer this behavior but you can easily
write a wrapper for the file loader:

    % macros=mkvi
    \def\strictload[#fname]{%
      \directlua{
        local success = environment.loadluafile[[#fname]]
        if not success then
          print[[unrecoverable error: could not load file #fname]]
          os.exit(1)
        end
      }%
    }
    \starttext
    \strictload[unknown]
    \stoptext


Hth
Philipp


> Cheers,
> André Caldas.
> ___________________________________________________________________________________
> 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!

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___________________________________________________________________________________

Re: Loading lua file.

[Andre Caldas]

Hello, Philipp!

>> If I load a lua file from a module using
>> \registerctxluafile{file}{1.001}
>> or
>> \ctxloadluafile{file}
>> How can I be sure the file was in fact loaded?
>
> The related tracker output is quite comprehensive:
>
>     \enabletrackers[resolvers.locating]
>     \ctxloadluafile{sometest}

Nice! Thank you.
In my case, it was not being loaded because I had syntax errors in the
lua file. The file was found, but not loaded. I guess it is a very
good reason to halt!


Cheers,
André Caldas.
___________________________________________________________________________________
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
___________________________________________________________________________________

Re: Loading lua file.

[Procházka Lukáš Ing. - Pontex s. r. o.]

Hello,

I'm using this if loading failure is not fatal:

----
DoFile = function(fn)
   return pcall(function() return dofile(fn) end)
end

DoFile("MyFile.lua") -- instead of 'dofile("MyFile.lua")'
----

You can play with handling error code (http://www.lua.org/manual/5.1/manual.html#pdf-pcall):

----
DoFile = function(fn)
   local suc, res = pcall(function() return dofile(fn) end)

   if suc then return res
   else
     -- Your handling code to come here
   end
end
----

Best regards,

Lukas


On Thu, 13 Dec 2012 15:52:03 +0100, Andre Caldas <andre.em.caldas@gmail.com> wrote:

> Hello, Philipp!
>
>>> If I load a lua file from a module using
>>> \registerctxluafile{file}{1.001}
>>> or
>>> \ctxloadluafile{file}
>>> How can I be sure the file was in fact loaded?
>>
>> The related tracker output is quite comprehensive:
>>
>>     \enabletrackers[resolvers.locating]
>>     \ctxloadluafile{sometest}
>
> Nice! Thank you.
> In my case, it was not being loaded because I had syntax errors in the
> lua file. The file was found, but not loaded. I guess it is a very
> good reason to halt!
>
>
> Cheers,
> André Caldas.


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________