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%D \module
%D [ file=page-inj,
%D version=2013.02.10,
%D title=\CONTEXT\ Page Module,
%D subtitle=Injections,
%D author=Wolfgang Schuster \& Hans Hagen,
%D date=\currentdate,
%D copyright=Wolfgang Schuster \& Hans Hagen,
%D license=see context related readme files (gpl)]
%D This module is based on an idea and prototype by Wolfgang but instead of
%D injectioning into a page constructor we injection it into the regular shipout
%D handler because that way we get page numbering. It's a sort of variation
%D on postponing but the content does not end up in the regular page flow, so
%D it's closer to page figures but without the usual page builder.
%D
%D This module is following the mkvi way of rendering setups and configuration
%D and is somewhat experimental. Probably more alternatives will be added. This
%D could become a delayed loaded module at some point (no real consequences).
\unprotect
\registerctxluafile{page-inj}{}
\installcorenamespace {pageinjection}
\installcorenamespace {pageinjectionalternative}
\installcorenamespace {pageinjectionrenderings}
\installframedcommandhandler \??pageinjection {pageinjection} \??pageinjection
\installcommandhandler \??pageinjectionalternative {pageinjectionalternative} \??pageinjectionalternative
\let\page_boxes_flush_before\clf_flushpageinjectionsbefore
\let\page_boxes_flush_after \clf_flushpageinjectionsafter
\def\page_injections_flush_saved#name#parameters%
{\begingroup
\edef\currentpageinjection{#name}%
\getdummyparameters[#parameters]%
\edef\currentpageinjectionalternative {\pageinjectionparameter \c!alternative }%
\edef\p_page_injectionalternative_rederingsetup{\pageinjectionalternativeparameter\c!renderingsetup}%
\page_injections_nextpage
\invokepagehandler\v!normal{\inheritedpageinjectionframed{\texsetup\p_page_injectionalternative_rederingsetup}}%
\endgroup}
\unexpanded\def\pageinjection
{\begingroup
\dodoubleempty\page_injections_direct}
\def\page_injections_direct[#1][#2]% name parameters | settings parameters | name | parameters
{\doifelseassignment{#1}
{\doifelseassignment{#2}
{\page_injections_direct_settings_parameters{#1}{#2}}
{\page_injections_direct_parameters {#1}}}
{\doifelseassignment{#2}
{\page_injections_direct_name_parameters {#1}{#2}}
{\page_injections_direct_name {#1}}}}
\def\page_injections_direct_settings_parameters#settings% #parameters%
{\let\currentpageinjection\empty
\checkpageinjectionparent
\setupcurrentpageinjection[#settings]%
\page_injections_direct_indeed}
\def\page_injections_direct_parameters% #parameters%
{\let\currentpageinjection\empty
\checkpageinjectionparent
\page_injections_direct_indeed}
\def\page_injections_direct_name_parameters#name% #parameters%
{\edef\currentpageinjection{#name}%
\checkpageinjectionparent
\page_injections_direct_indeed}
\def\page_injections_direct_name#name%
{\edef\currentpageinjection{#name}%
\checkpageinjectionparent
\page_injections_direct_indeed{}}
\def\page_injections_direct_indeed% #parameters%
{\edef\p_page_injections_state{\pageinjectionparameter\c!state}%
\edef\p_page_injections_delay{\pageinjectionparameter\c!delay}%
\edef\p_page_injections_page {\pageinjectionparameter\c!page }%
\ifx\p_page_injections_delay\v!yes
\expandafter\page_injections_direct_indeed_yes
\else
\expandafter\page_injections_direct_indeed_nop
\fi}
\def\page_injections_direct_indeed_yes#parameters%
{\clf_savepageinjections
name {\currentpageinjection}%
state {\p_page_injections_state}%
userdata {\normalunexpanded{#parameters}}%
\relax
\endgroup}
\def\page_injections_direct_indeed_nop#parameters%
{\ifx\p_page_injections_page\empty
\page
\else
\page[\p_page_injections_page]%
\fi
\getdummyparameters[#parameters]%
\page_injections_place
\endgroup}
\def\page_injections_place
{\edef\currentpageinjectionalternative {\pageinjectionparameter \c!alternative }%
\edef\p_page_injectionalternative_rederingsetup{\pageinjectionalternativeparameter\c!renderingsetup}%
\page_injections_nextpage
\ifx\currentpageinjectionalternative\v!none \else % increment counter but don’t generate output
\invokepagehandler\v!normal{\inheritedpageinjectionframed{\texsetup\p_page_injectionalternative_rederingsetup}}%
\fi}
\def\page_injections_nextpage
{\edef\p_page_injections_pagestate{\pageinjectionparameter\c!pagestate}%
\ifx\p_page_injections_pagestate\v!stop \else
\edef\p_page_injections_n{\pageinjectionparameter\c!n}%
\ifx\p_page_injections_n\empty
\let\p_page_injections_n\plusone
\fi
\dorecurse\p_page_injections_n
{\incrementcounter[\s!realpage]%
\incrementcounter[\s!userpage]}%
\fi}
\definepageinjectionalternative[\v!figure][\c!renderingsetup=\??pageinjectionrenderings:\v!figure]
\definepageinjectionalternative[\v!buffer][\c!renderingsetup=\??pageinjectionrenderings:\v!buffer]
\definepageinjectionalternative[\v!setups][\c!renderingsetup=\??pageinjectionrenderings:\s!setup ]
\startsetups[\??pageinjectionrenderings:\v!figure]
\dontleavehmode\externalfigure[\dummyparameter\c!name][\c!factor=\v!max]
\stopsetups
\startsetups[\??pageinjectionrenderings:\s!setup]
\setups[\dummyparameter\c!setup]% kind of redundant but fits in
\stopsetups
\startsetups[\??pageinjectionrenderings:\v!buffer]
\getbuffer[\dummyparameter\c!name]%
\stopsetups
% \setuppaper
% [\c!method=\v!pageinjection]
\setuppageinjection
[ \c!width=\paperwidth,
\c!height=\paperheight,
\c!frame=\v!off,
\c!offset=\v!overlay,
\c!delay=\v!no,
\c!state=\v!next,
\c!alternative=\v!figure]
\definepageinjection[\v!previouspage][\c!delay=\v!yes,\c!state=\v!previous]
\definepageinjection[\v!nextpage] [\c!delay=\v!yes,\c!state=\v!next]
\definepageinjection[\v!here] % direct
\definepageinjection[\v!empty] [\c!alternative=\v!none]
%definepageinjection[\v!chapter] [\v!previouspage][\c!pagestate=\v!stop]
\protect \endinput
% \enabletrackers[pagebuilder.injections]
%
% \setuppageinjection[offset=2em]
%
% \definepageinjection[chapter][previouspage][pagestate=stop]
% \definepageinjection[later] [delay=yes,state=+2]
%
% \useMPlibrary[dum]
%
% \starttext
%
% \startchapter[title={Insert pages before/after the current page}]
%
% \dorecurse{10}{one: \input ward\par}
%
% \pageinjection[previouspage][name=dummy-1]
%
% \dorecurse{20}{two: \input ward\par} \page
%
% \pageinjection[nextpage][name=dummy-2]
% \pageinjection[later] [name=dummy-4]
% \pageinjection[delay=yes,state=+2][name=dummy-5]
%
% \dorecurse{100}{three: \input ward\par}
%
% \stopchapter
%
% \startbuffer[whatever]
% \dorecurse{10}{whatever #1 }
% \stopbuffer
%
% \startchapter[title={Insert pages at the current location}]
%
% \dorecurse{10}{\input ward\par}
%
% \pageinjection[direct][name=dummy-3]
% \pageinjection[direct][alternative=buffer,name=whatever]
%
% \dorecurse{10}{\input ward\par}
%
% \stopchapter
%
% \setuphead
% [chapter]
% [beforesection={\pageinjection[empty]},
% insidesection={\pageinjection[chapter][name=\structureuservariable{image}]}]
%
% \startchapter[title={Combine both mechanism}][name=dummy-4]
%
% \dorecurse{10}{\input ward\par}
%
% \stopchapter
%
% \stoptext
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