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\def\newoptargcommand#1{%
\@ifnextchar({\@xoptargcmd{#1}}%
{\newcommand{#1}}%
}
\def\@xoptargcmd#1(#2){%
% \@ifdefinable#1%
% {
\expandafter\def\expandafter#1\expandafter{%
\expandafter
\@ifnextchar
\expandafter
[%
\csname\string#1\expandafter\endcsname
\expandafter
{\csname\string#1\endcsname[#2]}}%
\expandafter\@zoptargcmd
\csname\string#1\endcsname
}
\def\@zoptargcmd#1{%
\@ifnextchar[{\@zzoptargcmd#1}%
{\def#1[####1]}%
}
\catcode`\?=11\relax
\long\def\@zzoptargcmd#1[#2]#3{%
\@tempcnta#2\relax
\let#1\relax
\let\@?@\relax
\edef\@tempa{\long\def#1[\@?@1]}%
\@tempcntb \tw@
\@whilenum\@tempcnta>\z@
\do{%
\edef\@tempa{\@tempa\@?@\the\@tempcntb}%
\advance\@tempcntb \@ne
\advance\@tempcnta \m@ne}%
\let\@?@##%
\@tempa{#3}%
}
\catcode`\?=12\relax
\endinput
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