[tex-hyphen] String preparation

[Arthur Reutenauer]

> \fr
> 
> \hsize 1mm
> 
> \hjcode`x=`o
> 
> foobar % foo-bar
> 
> fxxbar % fxx-bar
> 
> \lefthyphenmin3
> 
> œdipus % œdi-pus
> 
> \lefthyphenmin4
> 
> œdipus % œdipus
> 
> \hjcode`œ=2    % < 32 then it's the length and code is char code
> 
> œdipus % œdi-pus

  That looks really nice :-)

>> Also, will this work with 0? For instance can we say
>> 
>>    \hjcode`^^^^0301=0
> 
> hjcode accepts a number (as any code primitive), the ` just turn a character
> into a number

  And the caret notation turns a number into a character ;-)  But I
don’t think that’s what Élie meant, he probably meant to ask what
happened if we set the \hjcode to zero.

	Best,

		Arthur