+\def\@setf{setf}
+
+%% \parse@dhd{NEXT}{CAT}[NAME]{SYNOPSIS}
+%% call NEXT{MOD}{CAT}{NAME}{SYNOPSIS}
+%% #1 #2 #3 #4
+\def\parse@dhd#1#2{% {NEXT}{CAT}
+ \@ifnextchar[{\parse@dhd@cc{#1}{#2}}{\parse@dhd@cd{#1}{#2}}}
+\def\parse@dhd@cc#1#2[#3]#4{% {NEXT}{CAT}[NAME]{SYNOPSIS}
+ #1{}{#2}{#3}{#4}}
+\def\parse@dhd@cd#1#2#3{% {NEXT}{CAT}{SYNOPSIS}
+ \parse@dhd@ce{#1}{#2}{#3}#3 \q@}
+\def\parse@dhd@ce#1#2#3#4 #5\q@{%
+ % {NEXT}{CAT}{SYNOPSIS}NAME [ARGS...]\q@
+ \def\temp@{#4}%
+ \ifx\temp@\@setf\def\next@{\parse@dhd@csetf{#1}{#2}{#3}#5 \q@}%
+ \else\def\next@{#1{}{#2}{#4}{#3}}\fi%
+ \next@%
+}
+\def\parse@dhd@csetf#1#2#3(#4 #5\q@{%
+ % {NEXT}{CAT}{SYNOPSIS}(NAME [ARGS...])\q@
+ #1{setf}{#2}{#4}{#3}}
+
+\newif\if@dheadfirst
+\def\dhead{\parse@dhd\dhead@}
+\def\dhead@#1#2#3#4{% {}{CAT}{NAME}{SYNOPSIS}
+ \if@dheadfirst\global\@dheadfirstfalse\else\relax\\[\smallskipamount]\fi%
+ {\let\protect\@empty\let\@uscore\relax%
+ \edef\temp@{#2:\@maybe@modlabel{#1}{#3}}%
+ \def\@uscore{_\@gobble}\message{\temp@}%
+ \def\@uscore{-\@gobble}\label{\temp@}}%
+ {\begingroup\lccode`\~=`\_\lowercase{\endgroup\def~{_}}%
+ \protected@edef\@tempa##1{%
+ \noexpand\index{%
+ #3@{\noexpand\code{#3}}!%
+ \protect\describecategoryname[#1]{#2}%
+ ##1%
+ }%
+ }%
+ \toks@\expandafter{\after@desc}%
+ \toks\tw@\expandafter{\@tempa{|)}}%
+ \xdef\after@desc{\the\toks@\the\toks\tw@}%
+ \@tempa{|(}}%
+ \rlap{\hb@xt@\linewidth{\hfil\normalfont\bfseries
+ [\describecategoryname[#1]{#2}]}}%
+ #4%
+}
+
+\def\desc@begin#1{%
+ \let\saved@after@desc\after@desc%
+ \gdef\after@desc{}%