Re: [bug-gawk] built-in variables in extensions

[Assaf Gordon]

Andrew J. Schorr wrote, On 12/17/2012 04:41 PM:
> On Mon, Dec 17, 2012 at 04:38:06PM -0500, Assaf Gordon wrote:
> 
> Yes, but what about my proposal at the bottom of my email:
> 
> On Mon, Dec 17, 2012 at 04:34:38PM -0500, Andrew J. Schorr wrote:
>> But suppose this is not a stable feature.  Here is another approach:
>>
>> bash-4.1$ cat /tmp/header.awk
>> @load "create_variable"
>>
>> NR == 1 {
>>         for (i = 1; i <= NF; i++)
>>                 create_variable($i, i)
>>         next
>> }
>>
>> where "create_variable" is a shared library extension that exports the 
>> function
>> create_variable that creates a variable whose name is given in the first
>> argument and value in the second.  I believe it should be pretty trivial to
>> implement this extension using the current gawk api.  While neither an
>> include file nor a shared library can do this without help, the combination
>> should do it quite easily, unless I'm hallucinating.
> 
> Can you try that?
> 

That's exactly what I'm working on now (which is how I discovered an extension 
can't access "NF" and "NR" if they are not defined in the AWK source.

Combining an AWK include and a C extension is a nice idea. Will keep you posted 
on progress.

-gordon