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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Module: ZzTeX Division Facilities
%
% Synopsis: This module contains the macros to support divisions, which
% allow a book to be processed in pieces.
%
% Author: Paul C. Anagnostopoulos
% Created: 24 September 1990
%
% Copyright 1989--2020 by Paul C. Anagnostopoulos
% under The MIT License (opensource.org/licenses/MIT)
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Divisions
% ---------
\def \zdivext {tex}
\definetoks{\divisionname} % Name of current division.
\definetoks{\zdivreq} % Divisions requested with \setdivisions.
\zdivreq = {\all}
\definetoks{\zdivset} % Divisions set.
\setlist \zdivset = {}
%~ This command is used in the book's root file to specify
%~ the list of divisions that should be processed by ZzTeX.
%~ All other divisions are not processed. If the command
%~ does not appear in the root file, all divisions are processed.
\def \setdivisions #1{% {division,...}
\if \emptyargp{#1}%
\warning{nodivs}{The \noexpand\setdivisions command does not specify any divisions}
\else
\global\zdivreq = {#1}%
\fi}
%~ This command is used in the book's root file to specify the
%~ name of a book division file (e.g., |chap01|, |appa|). The order
%~ of these commands determines the order of the divisions.
\def \division #1{% {division}
\global\divisionname = {#1}%
\edef \znext {\noexpand\inclusionlist\noexpand\zset{#1}{\the\zdivreq}}%
\znext
\if \zset
\remark{Starting division `\the\divisionname'.}%
\push{#1}{\zdivset}%
\freshpage{\short\floats\any}%
\setcolumnnumber{1}%
\zxdivinit{#1}{\true}%
\zindexdivinit{#1}%
\zmndivinit
\zpndivinit
\zframedivinit
\zmrdivinit
\zfltdivinit
\include{#1.\zdivext}%
\endgraf
\freshpage{\short\floats\any}%
\zortahdivfinal
\zindexdivfinal
\zxdivfinal{#1}%
\else
\zxdivinit{#1}{\false}%
{\globaldefs = 1 \name{\=zS:#1}}% % Invoke snapshot.
\fi
\global\divisionname = \expandafter{\jobname}}
% This macro is invoked at the end of the document.
\def \zdivmsg {%
\edef \znext {\the\zdivreq}%
\edef \znextfirst {\expandafter\zdivmsga \znext\zmark}%
\if \tokeqlp{\znext}{\zallname}%
\remark{The entire book was processed.}%
\else\if \tokeqlp{\znextfirst}{\zallbutname}%
\relax
\else
\commalist{\zreqlist}{\the\zdivreq}%
\maplist{\zdivmsgb{##1}}{\zreqlist}%
\fi\fi}
\def \zdivmsga #1#2\zmark{#1}
\def \zdivmsgb #1{%
\member{\zexists}{#1}{\zdivset}%
\if \notp{\zexists}%
\warning{divnotexist}{The requested division `#1' does not exist}%
\fi}
% Division Snapshots
% -------- ---------
\setlist \zsnaplist = {} % List of registers to be snapshot.
\def \declaresnapitem #1{% {\name}
\append{#1}{\zsnaplist}}
\def \ztakesnap {%
\let \zmodesave = \xrefmode
\let \xrefmode = \xrefsnapmode
\def \znext {}%
\maplist{\zsnapone{##1}}{\zsnaplist}%
\ztoksa = \expandafter{\znext}%
\edef \znext {\noexpand\xref{snap}{\noexpand\folio}{}%
{\the\ztoksa}{\the\divisionname}}%
\znext
\let \xrefmode = \zmodesave}
\def \zsnapone #1{% {\register}
\ztoksa = \expandafter{\znext}%
\edef \znext {\the\ztoksa \noexpand#1\the#1}}
% Store division snapshot information in a special name in the tag namespace.
\def \xrefsnap #1#2#3#4{% {}{}{code}{division}
\ifnum \xrefmode=\xrefloadtagmode
\if \undefinedp{\=zS:#4}\withname{\gdef}{\=zS:#4}{}\fi
\withname\xdef{\=zS:#4}{\name{\=zS:#4}#3}%
\fi}
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