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%D \module
%D [ file=page-otr,
%D version=2012.01.25,
%D title=\CONTEXT\ Page Macros,
%D subtitle=Output Routines,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Page Macros / Output Routines}
%D This module will get some of the code from other modules. At the
%D same time we provide a bit more control.
% When issuing two \par\penalty-\plustenthousand's, only the first
% triggers the otr. Is this an obscure feature or an optimization?
\unprotect
\def\m!otr{otr} % todo
\installcorenamespace{outputroutine}
\installswitchcommandhandler \??outputroutine {outputroutine} \??outputroutine
\newtoks\t_page_otr_commands
\newtoks\t_page_otr_tracers
\unexpanded\def\defineoutputroutinecommand[#name]% doing multiple on one go saves syncing
{\processcommalist[#name]\page_otr_commands_define}
\unexpanded\def\page_otr_commands_define#name%
{\ifcsname#name\endcsname \else
\expandafter\let\csname#name\endcsname\relax
\normalexpanded{\t_page_otr_commands{\the\t_page_otr_commands\noexpand\page_otr_commands_process{#name}}}%
\fi}
\let\page_otr_commands_process\gobbleoneargument
\appendtoks
\let\page_otr_commands_process\page_otr_specifics_preset
\the\t_page_otr_commands
\let\page_otr_commands_process\gobbleoneargument
\to \everyswitchoutputroutine
\unexpanded\def\page_otr_specifics_preset#1%
{\edef\page_otr_specifics_command{\strictoutputroutineparameter{#1}}% no inheritance of commands
\ifx\page_otr_specifics_command\empty
\writestatus{\currentoutputroutine}{- \expandafter\strippedcsname\csname#1\endcsname}%
\expandafter\let\csname#1\endcsname\relax
\else
\writestatus{\currentoutputroutine}{+ \expandafter\strippedcsname\csname#1\endcsname}%
\expandafter\let\csname#1\expandafter\endcsname\page_otr_specifics_command
\fi}
\unexpanded\def\page_otr_specifics_preset_normal#1%
{\edef\page_otr_specifics_command{\strictoutputroutineparameter{#1}}% no inheritance of commands
\ifx\page_otr_specifics_command\empty
\expandafter\let\csname#1\endcsname\relax
\else
\expandafter\let\csname#1\expandafter\endcsname\page_otr_specifics_command
\fi}
\unexpanded\def\page_otr_specifics_preset_traced#1%
{\edef\page_otr_specifics_command{\strictoutputroutineparameter{#1}}% no inheritance of commands
\ifx\page_otr_specifics_command\empty
\writestatus{\currentoutputroutine}{preset: - \expandafter\strippedcsname\csname#1\endcsname}%
\expandafter\let\csname#1\endcsname\relax
\else
\writestatus{\currentoutputroutine}{preset: + \expandafter\strippedcsname\csname#1\endcsname}%
\expandafter\let\csname#1\expandafter\endcsname\page_otr_specifics_command
\fi}
\let\page_otr_specifics_preset\page_otr_specifics_preset_normal
\unexpanded\def\traceoutputroutines
{\the\t_page_otr_tracers}
\appendtoks
\let\page_otr_specifics_preset\page_otr_specifics_preset_traced
\to \t_page_otr_tracers
%D We have a couple of output routines and the default one is
%D the single column routine. Then there is a multicolumn variant
%D that can be used mixed, and a columnset variant that is more
%D exclusive.
\installcorenamespace{otrtriggers}
\newconstant\c_page_otr_eject_penalty \c_page_otr_eject_penalty -\plustenthousand
\newconstant\c_page_otr_super_penalty \c_page_otr_super_penalty -\plustwentythousand
\newcount \c_page_otf_trigger_penalty \c_page_otf_trigger_penalty -100010
\newif \ifinotr % we keep this (name) for old times sake
\unexpanded\def\page_otr_message_b{\page_otr_message_s+}
\unexpanded\def\page_otr_message_e{\page_otr_message_s-}
\unexpanded\def\page_otr_message_s#1#2%
{\writestatus
\currentoutputroutine
{#1\space \space
#2\space \space
p:\the\outputpenalty,\space
r:\the\realpageno ,\space
c:\number\mofcolumns,\space
v:\the\vsize ,\space
g:\the\pagegoal ,\space
t:\the\pagetotal ,\space
\ifdim\pagetotal>\pagegoal
d:\the\dimexpr\pagetotal-\pagegoal\relax
\fi}}
\unexpanded\def\page_otr_trigger#1%
{\begingroup
\par
\penalty#1%
\endgroup}
\unexpanded\def\installoutputroutine#1#2% \invoke \action
{\global\advance\c_page_otf_trigger_penalty\minusone
\edef#1{\page_otr_trigger{\number\c_page_otf_trigger_penalty}}%
\setvalue{\??otrtriggers\number\c_page_otf_trigger_penalty}{#2}}
\unexpanded\def\page_otr_triggered_output_routine_traced
{\ifcsname\??otrtriggers\the\outputpenalty\endcsname
\page_otr_message_b{special}%
\csname\??otrtriggers\the\outputpenalty\endcsname
\page_otr_message_e{special}%
\else
\page_otr_message_b{normal}%
\page_otr_command_routine
\page_otr_message_e{normal}%
\fi}
\unexpanded\def\page_otr_triggered_output_routine_normal
{\ifcsname\??otrtriggers\the\outputpenalty\endcsname
\csname\??otrtriggers\the\outputpenalty\endcsname
\else
\page_otr_command_routine
\fi}
\let\page_otr_triggered_output_routine\page_otr_triggered_output_routine_normal
\appendtoks
\let\page_otr_triggered_output_routine\page_otr_triggered_output_routine_traced
\to \t_page_otr_tracers
%D The real routine handler:
\ifdefined\everybeforeoutput \else \newtoks\everybeforeoutput \fi
\ifdefined\everyafteroutput \else \newtoks\everyafteroutput \fi
\def\page_otf_set_engine_output_routine#1%
{\global\output
{\inotrtrue
\the\everybeforeoutput
#1\relax
\the\everyafteroutput}}
\page_otf_set_engine_output_routine\page_otr_triggered_output_routine
\installoutputroutine\synchronizeoutput
{\ifvoid\normalpagebox\else
\unvbox\normalpagebox
\pagediscards
\fi}
\installoutputroutine\discardpage
{\setbox\scratchbox\box\normalpagebox}
% todo: \resetpagebreak -> everyejectpage
\def\page_otr_trigger_output_routine
{\par
\ifvmode
\penalty\c_page_otr_eject_penalty
\fi
\resetpagebreak}
\def\page_otr_fill_and_eject_page
{\par
\ifvmode
\vfill
\penalty\c_page_otr_eject_penalty
\fi
\resetpagebreak}
\def\page_otr_eject_page
{\par
\ifvmode
\ifdim\pagetotal>\pagegoal \else
\normalvfil
\fi
\penalty\c_page_otr_eject_penalty
\fi
\resetpagebreak}
\def\page_otr_eject_page_and_flush_inserts % can be an installed one
{\par
\ifvmode
\ifdim\pagetotal>\pagegoal \else
\normalvfil
\fi
\penalty\c_page_otr_super_penalty
\fi
\resetpagebreak}
\def\page_otr_check_for_pending_inserts
{\ifnum\outputpenalty>\c_page_otr_super_penalty \else
\ifnum\insertpenalties>\zerocount
% something is being held over so we force a new page
\page_otr_force_another_page
\fi
\fi}
\def\page_otr_force_another_page
{% we should actually remove the dummy line in the otr
\hbox to \hsize{}%
\kern-\topskip
\nobreak
\vfill
\penalty\c_page_otr_super_penalty
\resetpagebreak}
%D For those who've read the plain \TEX\ book, we provide the next
%D macro:
\unexpanded\def\bye
{\writestatus\m!system{Sorry, you're not done yet, so no goodbye!}}
%D We define a few constants because that (1) provides some checking
%D and (2) is handier when aligning definitions (checks nicer).
\definesystemconstant{page_otr_command_routine}
\definesystemconstant{page_otr_command_package_contents}
\definesystemconstant{page_otr_command_set_vsize}
\definesystemconstant{page_otr_command_set_hsize}
\definesystemconstant{page_otr_command_synchronize_hsize}
\definesystemconstant{page_otr_command_next_page}
\definesystemconstant{page_otr_command_next_page_and_inserts}
\definesystemconstant{page_otr_command_set_top_insertions}
\definesystemconstant{page_otr_command_set_bottom_insertions}
\definesystemconstant{page_otr_command_flush_top_insertions}
\definesystemconstant{page_otr_command_flush_bottom_insertions}
\definesystemconstant{page_otr_command_check_if_float_fits}
\definesystemconstant{page_otr_command_set_float_hsize}
\definesystemconstant{page_otr_command_flush_float_box}
\definesystemconstant{page_otr_command_side_float_output}
\definesystemconstant{page_otr_command_synchronize_side_floats}
\definesystemconstant{page_otr_command_flush_floats}
\definesystemconstant{page_otr_command_flush_side_floats}
\definesystemconstant{page_otr_command_flush_saved_floats}
\definesystemconstant{page_otr_command_flush_margin_blocks}
\definesystemconstant{singlecolumn}
\definesystemconstant{multicolumn}
\definesystemconstant{columnset}
\defineoutputroutinecommand
[\s!page_otr_command_routine,
\s!page_otr_command_package_contents,
\s!page_otr_command_set_vsize,
\s!page_otr_command_set_hsize,
\s!page_otr_command_synchronize_hsize, % for columns of different width
\s!page_otr_command_next_page,
\s!page_otr_command_next_page_and_inserts,
\s!page_otr_command_set_top_insertions,
\s!page_otr_command_set_bottom_insertions,
\s!page_otr_command_flush_top_insertions,
\s!page_otr_command_flush_bottom_insertions,
\s!page_otr_command_check_if_float_fits,
\s!page_otr_command_set_float_hsize,
\s!page_otr_command_flush_float_box,
\s!page_otr_command_side_float_output, % name will change as will hooks
\s!page_otr_command_synchronize_side_floats,
\s!page_otr_command_flush_floats,
\s!page_otr_command_flush_side_floats,
\s!page_otr_command_flush_saved_floats,
\s!page_otr_command_flush_margin_blocks]
\appendtoks
\setupoutputroutine[\s!singlecolumn]%
\to \everydump
\protect \endinput
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