[texhax] Detection of start of source line

[Philip Taylor]

But now that the cat has got off and I am wearing the right glasses, I can confirm that my suggestion does not work as-is; even when \futurelet has changed \nexttoken into the character '*', the \ifx fails, for reasons that temporarily escape me ...

> {changing \nextoken=the letter a}
>
> {into \nextoken=the character *}
>
> \treatasteriskspecially -> \ifx *\nexttoken \item \else \char `\* \fi
>
> {blank space }
>
> {\ifx: (level 1) entered on line 7}
>
> {false}
>
> {\else: \ifx (level 1) entered on line 7}
>
> {\char}
>
> {\fi:
>


Philip Taylor wrote:
>     \def \treatasteriskspecially { \ifx *\nexttoken \item \else \char `\* \fi}
>     \catcode `\^^M = \active \def ^^M{\futurelet \nextoken \treatasteriskspecially}

-- 

Philip Taylor
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