[texhax] Equating conditionals

[VAFA KHALIGHI]

I found my answer:

 \documentclass{article}

\makeatletter

\def\eqnewif#1#2{%

\count@\escapechar \escapechar\m at ne

\let#1\iffalse

\let#2\iffalse

\eq at if#1#2\iftrue

\eq at if#1#2\iffalse

\escapechar\count@}

\def\eq at if#1#2#3{%

\expandafter\def\csname\expandafter\@gobbletwo\string#1%

\expandafter\@gobbletwo\string#3\endcsname

{\let#1#3

\let#2#3}

\expandafter\def\csname\expandafter\@gobbletwo\string#2%

\expandafter\@gobbletwo\string#3\endcsname

{\let#2#3

\let#1#3}

}

\eqnewif{\if at RTL}{\if at rl}

\@RTLtrue

\def\test{\if at rl RTL\else LTR\fi}

\makeatother

\begin{document}

\test

\end{document}


On Sat, Sep 17, 2011 at 12:47 PM, VAFA KHALIGHI <vafaklg at gmail.com> wrote:

> I want to have a macro \eqnewif{#1}{#2} that if \if#1 is already defined by
> \newif, then \if#1 and \if#2 is the same thing such that \#1true is the same
> as \#2true and \#1false is the same as \#2false. This is what I have done:
>
> \documentclass{article}
>
> \makeatletter
>
> \newcommand*{\eq at newif}[2]{%
>
> \expandafter\let\csname if#2\expandafter\endcsname\csname if#1\endcsname}
>
> \def\eqnewif#1#2{\expandafter\newif\csname if#2\endcsname\eq at newif
> {#1}{#2}}
>
> \newif\if at RTL
>
> \eqnewif{@RTL}{@rl}
>
> \@RTLtrue
>
> \def\test{\if at rl RTL\else LTR\fi}
>
> \makeatother
>
> \begin{document}
>
> \test
>
> \end{document}
>
>
> but it returns LTR instead RTL however if I move \def\test.. before
> \@RTLtrue , then it behaves as I expect. How should I fix this?
>
>
> Thanks
>
>
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