[NTG-context] Using lua to define a macro with one optional parameter in brackets

[Taco Hoekwater]

> On 08 Jul 2015, at 13:04, Jaroslav Hajtmar <hajtmar at gyza.cz> wrote:
> 
> Hi Taco.
> full deployment is unfortunately not working.
> 
> Unfortunately I need to cycle create different macros whose names are variable. At this moment I can not deal with this:
> 
>       --- context.doxlsname() --- ?????

context[‘do’..xlsname]()


> Thanx Jaroslav Hajtmar
> 
> here is another minimal example:
> 
> 
> 
> \starttext
> 
> 
> \def\linepointer{5}
> 
> \def\csvcell[#1,#2]{cell #1,#2}
> 
> 
> \directlua{
> xlsname='A'
> interfaces.definecommand ('do'..xlsname, {
>    arguments = { { "option", "string" }  },
>    macro = function (opt_1)
>          if #opt_1>0 then context('\\csvcell["'..xlsname..'",'..opt_1..']') else context('\\csvcell["'..xlsname..'",\\linepointer]') end
>    end
> })
> interfaces.definecommand (xlsname, {
>    macro = function ()
>       context.dosingleempty()
>       --- context.doxlsname() --- ?????
>    end
> })
> }
> 
> 
> \csvcell['Firstname',\linepointer]
> 
> 
> \A
> 
> \A[5]
> 
> 
> 
> 
> \stoptext
> 
> 
> 
> Dne 8. 7. 2015 v 12:07 Taco Hoekwater napsal(a):
>> \startluacode
>> interfaces.definecommand ('dolastname', {
>>     arguments = { { "option", "string" }  },
>>     macro = function (opt_1)
>>        if #opt_1>0 then context(opt_1) else context('nothing') end
>>     end
>> })
>> interfaces.definecommand ('lastname', {
>>     macro = function ()
>>        context.dosingleempty()
>>        context.dolastname()
>>     end
>> })
>> \stopluacode
>