doc/sod.sty: Forbid page breaks between description header entries.

[sod] / doc / sod.sty

%%% -*-latex-*-
%%%
%%% Styles and other hacking for the Sod manual
%%%
%%% (c) 2015 Straylight/Edgeware
%%%

%%%----- Licensing notice ---------------------------------------------------
%%%
%%% This file is part of the Sensible Object Design, an object system for C.
%%%
%%% SOD is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% SOD is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%%% GNU General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with SOD; if not, write to the Free Software Foundation,
%%% Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

\ProvidesPackage{sod}

%% More reference types.
\defxref{p}{part}

%% Other languages with special typesetting.
\def\Cplusplus{C\kern-\p@++}
\def\Csharp{C\#}

%% Special maths notation.
\def\chain#1#2{\mathsf{ch}_{#1}(#2)}
\def\chainhead#1#2{\mathsf{hd}_{#1}(#2)}
\def\chaintail#1#2{\mathsf{tl}_{#1}(#2)}

%% Other mathematical tweaks.
\let\implies\Rightarrow
\let\epsilon\varepsilon

%% A table heading cell.  Clone and hack \multicolumn.
\def\thd{\omit\@ifnextchar[\thd@{\thd@[l]}}
\def\thd@[#1]#2{%
  \begingroup
    \tab@multicol \tab@initread \let\tab@looped\tab@err@multi
    \tab@preamble{}\def\tab@midtext{\bfseries#2}\tab@readpreamble{#1}%
    \the\tab@preamble
  \endgroup \ignorespaces
}

%% Unix manpage references.
\def\man#1#2{\textbf{#1}(#2)}

%% Listings don't need to be small.
\let\listingsize\relax

%% Notes for later.
\def\fixme#1{\leavevmode\marginpar{FIXME}\index{FIXME}[FIXME: #1]}

%% Diagram settings.
\tikzset{
  every picture/.style={>=stealth, thick},
  lit/.style={font=\sffamily}
}

%% Metavariables are italics without decoration.
\def\syntleft{\normalfont\itshape}
\let\syntright\empty

%% Literal code is in sans face.
\def\codeface{\upshape\sffamily}
\DeclareRobustCommand\code[1]{%
  \ifmmode\hbox\else\leavevmode\fi%
  {\normalfont\codeface\/#1\/}%
}
\def\ulitleft{\normalfont\codeface}
\let\ulitright\empty
\def\lit@i#1#2#3{\ifmmode\leavevmode\hbox\fi{#1{#3\/}#2}}

%% Conditionally enter maths mode.  Can't use \ensuremath here because we
%% aren't necessarily sure where the maths will actually end.
\let\m@maybe@end\relax
\def\m@maybe{\ifmmode\else$\let\m@maybe@end$\fi}

%% Standard syntax shortcuts.
\atdef <#1>{\synt{#1}\@scripts}
\atdef "#1"{\lit*{#1}\@scripts}
\atdef `#1'{\lit{#1}\@scripts}
\atdef |#1|{\lit*{#1}\@scripts}

%% A handy abbreviation; `\\' itself is too good to steal.
\atdef \\{\textbackslash}

%% Intercept grammar typesetting and replace the vertical bar with the
%% maths-font version.
\let\@@grammar\grammar
\def\grammar{\def\textbar{\hbox{$|$}}\@@grammar}

%% Collect super- and subscripts.  (Note that underscores are active for the
%% most part.)  When we're done, end maths mode if we entered it
%% conditionally.
\def\@scripts{\futurelet\@ch\@scripts@i}
\begingroup\lccode`\~=`\_\lowercase{\endgroup
\def\@scripts@i{\if1\ifx\@ch~1\else\ifx\@ch^1\else0\fi\fi%
  \expandafter\@scripts@ii\else\expandafter\m@maybe@end\fi}}
\def\@scripts@ii#1#2{\m@maybe#1{#2}\@scripts}

%% Doubling characters, maybe.  Either way, chain onto \@scripts.
\def\dbl@maybe#1{\let\@tempa#1\futurelet\@ch\dbl@maybe@i}
\def\dbl@maybe@i{\m@maybe\ifx\@ch\@tempa\@tempa\!\@tempa%
  \expandafter\@firstoftwo\expandafter\@scripts%
  \else\@tempa\expandafter\@scripts\fi}

%% Extra syntax for Lisp templates.  These produce the maths-font versions of
%% characters, which should contrast well against the sans face used for
%% literals.
\atdef [{\dbl@maybe[}
\atdef ]{\dbl@maybe]}
\atdef {{\m@maybe\{\@scripts}
\atdef }{\m@maybe\}\@scripts}
\atdef ({\m@maybe(\@scripts}
\atdef ){\m@maybe)\@scripts}
\atdef !{\m@maybe|\@scripts}
\def\returns{\m@maybe\longrightarrow\m@maybe@end\hspace{0.5em}\ignorespaces}
\atdef >{\leavevmode\unskip\hspace{0.5em}\returns}
\atdef -#1{\if>#1\hbox{--\raisebox{.4pt}{>}}\penalty200\relax\fi}

%% Comment setting.
\def\comment#1{\mbox{\normalfont\itshape\/#1\/}}
\atdef /*#1*/{/*\comment{#1}*/}
\def\@semis{\@ifnextchar;{;\@semis}\@semicomment}
\def\@semicomment#1\\{\comment{#1}\\}
\atdef ;#1\\{;\@semis}

%% Environment for setting programs.  Newlines are explicit, because
%% otherwise I need comments in weird places to make the vertical spacing
%% come out properly.  You can write `\obeylines' if you really want to.
\def\@prog{\let\prog@@cr\@tabcr\let\@tabcr\@progcr\codeface\tabbing}
\def\prog{\quote\@prog}
\def\endprog{\endtabbing\endquote}
\let\nprog\@prog
\let\endnprog\endtabbing
\def\ind{\quad\=\+\kill}
\def\@progcr{\futurelet\@tempa\@progcr@i}
{\def\:{\gdef\@progcr@sp}\: {\@progcr}}
\atdef~{\textasciitilde}
\def\@progcr@i{%
  \ifx\@tempa\@sptoken\let\next@\@progcr@sp\else
  \if1\ifx\@tempa[1\else
      \ifx\@tempa*1\else
      0\fi\fi
    \let\next@\prog@@cr\else
  \if1\ifx\@tempa+1\else
      \ifx\@tempa-1\else
      0\fi\fi
    \let\next@\@progcr@ii\else
  \let\next@\@progcr@a\fi\fi\fi
  \next@}
\def\@progcr@a{\prog@@cr*{}\ignorespaces}
\def\@progcr@ii#1{\csname @progcr@#1\endcsname\ignorespaces}
\@namedef{@progcr@+}{\prog@@cr[\medskipamount]}
\@namedef{@progcr@-}{\prog@@cr*[\jot]}
\def\macsl{\`\textbackslash\hskip\leftmargin}

%% Put a chunk of text in a box.
\newenvironment{boxy}[1][\q@]{%
  \savenotes
  \dimen@\linewidth\advance\dimen@-1.2pt\advance\dimen@-2ex%
  \medskip%
  \vbox\bgroup\hrule\hbox\bgroup\vrule%
  \vbox\bgroup\vskip1ex\hbox\bgroup\hskip1ex\minipage\dimen@%
  \def\@temp{#1}\ifx\@temp\q@\else\leavevmode{\headfam\bfseries#1\quad}\fi%
}{%
  \endminipage\hskip1ex\egroup\vskip1ex\egroup%
  \vrule\egroup\hrule\egroup%
  \medskip%
  \spewnotes%
}

%% Lisp documentation machinery.
\def\definedescribecategory#1{%
  \@ifnextchar[{\def@desc{#1}}{\def@desc{#1}[plain]}}
\def\def@desc#1[#2]#3{\@namedef{cat!#1}##1{#3}\@namedef{catsw!#1}{#2}}
\def\describecategoryname{\@ifnextchar[\@descname@i{\@descname@i[]}}
\def\@descname@i[#1]#2{%
  \expandafter\let\expandafter\@tempa\csname cat!#2\endcsname%
  \expandafter\let\expandafter\@tempb\csname descmod/#1\endcsname%
  \ifx\@tempa\relax\@tempb{#2}\else\@tempa\@tempb\fi}
\def\@maybe@modlabel#1#2{\if!#1!\else#1/\fi#2}

\definedescribecategory{sym}{symbol}
\definedescribecategory{fun}{#1{function}}
\definedescribecategory{gf}{generic #1{function}}
\definedescribecategory{msg}{message}
\definedescribecategory{var}{variable}
\definedescribecategory{modvar}{module variable}
\definedescribecategory{const}{constant}
\definedescribecategory{meth}[method]{primary #1{method}}
\definedescribecategory{ar-meth}[method]{\code{:around} #1{method}}
\definedescribecategory{be-meth}[method]{\code{:before} #1{method}}
\definedescribecategory{af-meth}[method]{\code{:after} #1{method}}
\definedescribecategory{cls}{class}
\definedescribecategory{rst}{restart}
\definedescribecategory{ty}{type}
\definedescribecategory{type}{type}
\definedescribecategory{mac}{#1{macro}}
\definedescribecategory{lmac}{local #1{macro}}
\definedescribecategory{parse}{parser spec}
\definedescribecategory{parseform}{parser form}
\definedescribecategory{opt}{option handler}
\definedescribecategory{optmac}{option macro}
\definedescribecategory{plug}{pluggable parser}
\def\nlret{\\\hspace{4em}\returns}

\@namedef{descmod/}#1{#1}

\@namedef{descmod/setf}#1{\code{setf}-#1}

\@namedef{descargs/plain}#1{#1{}}
\@namedef{desclabel/plain}#1#2#3{#1:\@maybe@modlabel{#2}{#3}}
\@namedef{descindex/plain}#1#2#3{%
  #3@\noexpand\code{#3}!%
  \protect\describecategoryname[#2]{#1}%
}

\@namedef{descargs/method}#1#2{#1{{#2}}}
\@namedef{desclabel/method}#1#2#3#4{#1:\@maybe@modlabel{#2}{#3}(#4)}
\@namedef{descindex/method}#1#2#3#4{%
  #3@\noexpand\code{#3}!%
  \protect\describecategoryname[#2]{#1}%
  \protect\fmtspecs{ specialized at }{#4}%
}

\def\@desc@dispatch#1#2{%
  \csname #1/%
  \expandafter\ifx\csname catsw!#2\endcsname\relax plain%
  \else \csname catsw!#2\endcsname \fi%
  \endcsname%
}

\def\q@{\q@}
\def\@setf{setf}

\def\fmtspecs#1#2{%
  \if!#2!\else\count@\z@\toks@{}#1\@fmtspecs@i#2,\q@,\fi}
\def\@fmtspecs@i#1,{%
  \def\@tempa{#1}%
  \ifx\@tempa\q@%
    \ifcase\count@(no args?!)%
    \or% nothin' doin
    \or \space and %
    \else, and %
    \fi%
    \the\toks@%
  \else%
    \ifnum\count@>\@ne, \fi%
    \the\toks@%
    \toks@{\code{#1}}\advance\count@\@ne%
    \expandafter\@fmtspecs@i%
  \fi%
}

%% \parse@dhd{NEXT}[MOD]{CAT}{...}...[NAME]{SYNOPSIS}
%% call NEXT{MOD}{CAT}{{...}...}{NAME}{SYNOPSIS}
%%            #1   #2      #3     #4      #5
\def\@setf{setf}
\def\parse@dhd#1{%  {NEXT}
  \@ifnextchar[{\parse@dhd@a{#1}}{\parse@dhd@c{#1}}}
\def\parse@dhd@a#1[#2]#3{%  {NEXT}[MOD]{CAT}
  \@desc@dispatch{descargs}{#3}{\parse@dhd@ab{#1}{#2}{#3}}}
\def\parse@dhd@ab#1#2#3#4{%  {NEXT}{MOD}{CAT}{{...}...}
  \@ifnextchar[{\parse@dhd@ac{#1}{#2}{#3}{#4}}{\parse@dhd@ad{#1}{#2}{#3}{#4}}}
\def\parse@dhd@ac#1#2#3#4[#5]#6{%  {NEXT}{MOD}{CAT}{{...}...}[NAME]{SYNOPSIS}
  #1{#2}{#3}{#4}{#5}{#6}}
\def\parse@dhd@ad#1#2#3#4#5{%  {NEXT}{MOD}{CAT}{{...}...}{NAME [ARGS...]}
  \parse@dhd@ae{#1}{#2}{#3}{#4}{#5}#5 \q@}
\def\parse@dhd@ae#1#2#3#4#5#6 #7\q@{%
  % {NEXT}{MOD}{CAT}{{...}...}{SYNSOPSIS}NAME [ARGS...]\q@
  #1{#2}{#3}{#4}{#6}{#5}}

\def\parse@dhd@c#1#2{%  {NEXT}{CAT}
  \@desc@dispatch{descargs}{#2}{\parse@dhd@cb{#1}{#2}}}
\def\parse@dhd@cb#1#2#3{%  {NEXT}{CAT}{{...}...}
  \@ifnextchar[{\parse@dhd@cc{#1}{#2}{#3}}{\parse@dhd@cd{#1}{#2}{#3}}}
\def\parse@dhd@cc#1#2#3[#4]#5{%  {NEXT}{CAT}{{...}...}[NAME]{SYNOPSIS}
  #1{}{#2}{#3}{#4}{#5}}
\def\parse@dhd@cd#1#2#3#4{%  {NEXT}{CAT}{{...}...}{SYNOPSIS}
  \parse@dhd@ce{#1}{#2}{#3}{#4}#4 \q@}
\def\parse@dhd@ce#1#2#3#4#5 #6\q@{%
  % {NEXT}{CAT}{{...}...}{SYNOPSIS}NAME [ARGS...]\q@
  \def\temp@{#5}%
  \ifx\@setf\temp@\def\next@{\parse@dhd@csetf{#1}{#2}{#3}{#4}#6 \q@}%
  \else\def\next@{#1{}{#2}{#3}{#5}{#4}}\fi%
  \next@%
}
\def\parse@dhd@csetf#1#2#3#4(#5 #6\q@{%
  % {NEXT}{CAT}{{...}...}{SYNOPSIS}(NAME [ARGS...])\q@
  #1{setf}{#2}{#3}{#5}{#4}}

\newif\if@dheadfirst
\def\dhead{\parse@dhd\dhead@}
\def\dhead@#1#2#3#4#5{%  {MOD}{CAT}{{...}...}{NAME}{SYNOPSIS}
  \if@dheadfirst\global\@dheadfirstfalse\else\relax\\*[\smallskipamount]\fi%
  \phantomsection%
  {\let\protect\@empty\let\@uscore\relax%
   \edef\temp@{\@desc@dispatch{desclabel}{#2}{#2}{#1}{#4}#3}%
   \def\@uscore{_\@gobble}\expandafter\message\expandafter{\temp@}%
   \def\@uscore{-\@gobble}\expandafter\label\expandafter{\temp@}}%
  {\begingroup\lccode`\~=`\_\lowercase{\endgroup\def~{_}}%
   \protected@edef\@tempa##1{%
     \noexpand\index{\@desc@dispatch{descindex}{#2}{#2}{#1}{#4}#3##1}}%
   \toks@\expandafter{\@tempa{|)}}%
   \toks\tw@\expandafter{\after@desc}%
   \xdef\after@desc{\the\toks\tw@\the\toks@}%
   \@tempa{|(}}%
  \rlap{\hb@xt@\linewidth{\hfil\normalfont\bfseries
      [\describecategoryname[#1]{#2}]}}%
  #5%
}

\def\desc@begin#1{%
  \let\saved@after@desc\after@desc%
  \gdef\after@desc{}%
  \normalfont%
  \if@nobreak\else\par\goodbreak\fi%
  \global\@dheadfirsttrue%
  \begingroup%
    \let\@endparenv\relax%
    \clubpenalty\@M \widowpenalty\@M \interlinepenalty50%
    \@prog#1\endtabbing%
  \endgroup%
  \penalty\@M\@afterheading%
  \list{}{\rightmargin\z@\topsep\z@}\item%
}
\def\desc@end{\endlist\after@desc\global\let\after@desc\saved@after@desc}

\@namedef{describe*}#1{\desc@begin{#1}}
\expandafter\let\csname enddescribe*\endcsname\desc@end
\def\describe{\parse@dhd\desc@}
\def\desc@#1#2#3#4#5{\desc@begin{\dhead@{#1}{#2}{#3}{#4}{#5}}}
\let\enddescribe\desc@end

\def\descref#1{\@ifnextchar[{\descref@i{#1}}{\descref@ii{#1}{}}}
\def\descref@i#1[#2]{\descref@ii{#1}{ #2}}
\def\descref@ii#1#2#3{%
  \code{#1}#2 (page~%
  {\let\protect\@empty%
   \def\@uscore{-\@gobble}\edef\@tempa{\noexpand\pageref{#3:#1}}\@tempa}%
  )%
}

%%%----- That's all, folks --------------------------------------------------
\endinput