Re: beta (processaction & "|")

[Hans Hagen <pragma@wxs.nl>]

Peter Rolf wrote:
> Hans Hagen wrote:
>   
>> Peter Rolf wrote:
>>     
>>> Hans Hagen wrote:
>>>   
>>>       
>>>> Peter Rolf wrote:
>>>>     
>>>>         
>>>>> \processaction[\FOO][
>>>>>   |=>,
>>>>>   unknown=>]
>>>>>   
>>>>>       
>>>>>           
>>>> hm, | and ~ are always special, put \string in fron tof it, or use \letterbar and \lettertilde 
>>>>
>>>>     
>>>>         
>>> hm, same error if I use \string| or \letterbar
>>>   
>>>       
>> do you have a minimal tes file?
>>
>> a solution may be
>>
>> \let\savedbarcommand=|
>>
>> \unexpanded\def|{\savedbarcommand}
>>
>>     
> Yes, this works.
>
> I've tried to create a minimal example, but in the end all points to the
> fact, that "|" is a special character. So even the use of "|" as
> argument of some macro like
>
>  \FOO[data={||abcx}]{..}
>
> is not recommended (without prior catcode change). I use the symbols as
> an abbreviation for different MP graphics, and it wouldn't make sense to
> write \letterbar every time. Looks like I have to choose a different symbol.
>   
still experimental is that you can change the catcodetable (pseudo in 
mkii, native in mkiv) but i won't bring up it's dirty details here


\let\savedbarcommand=|
 
\unexpanded\def|{\savedbarcommand}

this makes them unexpandable but still using ~ and | for such purposes is kind of tricky 

Hans 

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