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%D \module
%D [ file=typo-drp, % was typo-par
%D version=2011.10.27,
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Initials,
%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 Typesetting Macros / Initials}
%D This will change ... par specific attribute set and such.
\unprotect
\registerctxluafile{typo-drp}{autosuffix}
\definesystemattribute[initial][public]
\appendtoks
\c_attr_initial\attributeunsetvalue
\to \everyforgetall
%D For the moment here: dropped caps redone. In addition to the parameters shown in
%D the example you can use the \type {style} and more low level \type {font} keys to
%D set up the font where the first one wins. If you don't like the behaviour you can
%D always roll out your own command.
%D
%D \starttyping
%D \placeinitial \input ward \par \input ward \par \placeinitial \input tufte
%D
%D \setupinitial
%D [location=text,
%D n=2,
%D color=darkred,
%D distance=-1em,
%D hoffset=1em,
%D voffset=-3ex,
%D before=\blank]
%D
%D \placeinitial \input ward \par \input ward \placeinitial \input tufte
%D \stoptyping
% todo: angle (once we can set parshape at the Lua end)
\installcorenamespace{initial}
\installcommandhandler \??initial {initial} \??initial
\definemeasure[initial:n][\lineheight*\initialparameter\c!n - \strutdp]
\setupinitial
[\c!location=\v!text,
\c!n=3,
\c!m=1,
\c!method=\v!none,
% \c!font=Bold sa 4,
% \c!font=Bold ht \measure{initial:n},
\c!font=Bold cp \measure{initial:n},
\c!distance=.125\emwidth,
\c!hoffset=\zeropoint,
\c!voffset=\v!line, % \dimexp\lineheight*\initialparameter\c!n-\lineheight\relax]
\c!style=,
\c!color=,
\c!before=\blank]
\permanent\tolerant\protected\def\placeinitial[#1]% old command
{\par
\namedinitialparameter{#1}\c!before
\enforced\edef\typo_initial_handle{\typo_initial_handle_indeed{#1}{}}}
\permanent\tolerant\protected\def\setinitial[#1]#*[#2]%
{\enforced\edef\typo_initial_handle{\typo_initial_handle_indeed{#1}{#2}}}
\permanent\tolerant\protected\def\flushinitial % when used inside a mechanism that forgets
{\typo_initial_handle}
\newconstant \c_initial_lines
\newconditional\c_initial_synchronize
% First experiment:
%
% \startluacode
% function nodes.handlers.forgetinitial(mode,indented,context)
% token.expandmacro("forgetinitial")
% return indented
% end
% utilities.sequencers.prependaction("paragraph","system","nodes.handlers.forgetinitial")
% utilities.sequencers.enableaction("paragraph","nodes.handlers.forgetinitial")
% \stopluacode
%
% Second experiment:
%
% \appendtoks
% \forgetinitial
% \to \everybeforepar
\protected\def\typo_initial_handle_indeed#1#2%
{\dontleavehmode
\begingroup
\cdef\currentinitial{#1}%
\setupcurrentinitial[#2]%
\resetfontfeature % might be needed in more places
\doifelsenothing{\initialparameter\c!style}
{\definedfont[\initialparameter\c!font]}
{\useinitialstyleparameter\c!style}%
\useinitialcolorparameter\c!color
\edef\p_voffset{\initialparameter\c!voffset}%
\scratchcounter \initialparameter\c!n\relax
\scratchvoffset\dimexpr\ifx\p_voffset\v!line\scratchcounter\lineheight-\lineheight\else\p_voffset\fi\relax
\clf_setinitial
location {\initialparameter\c!location}%
enabled true\space
n \scratchcounter
m \numexpr\initialparameter\c!m\relax
method {\initialparameter\c!method}%
distance \dimexpr\initialparameter\c!distance\relax
hoffset \dimexpr\initialparameter\c!hoffset\relax
voffset \scratchvoffset
ma \c_attr_colormodel
ca \c_attr_color
ta \c_attr_transparency
font \fontid\font
glyphscale \glyphscale
dynamic \font_dynamic_value % it's a bit over the top to support this here
\relax
\c_attr_initial\plusone
\initialparameter\c!text
\normalexpanded{\endgroup\c_initial_lines\the\scratchcounter}%
\enforced\glettonothing\typo_initial_handle
\ifconditional\c_initial_synchronize
\appendtoks \forgetinitial \to \everybeforepar
\fi}
\lettonothing\typo_initial_handle % hook into everypar
\permanent\protected\def\forgetinitial
{\ifcase\c_initial_lines\else
\begingroup
\advanceby\c_initial_lines-\prevgraf\relax
\ifcase\c_initial_lines\else
\obeydepth
\forgetall
\testpage[\the\c_initial_lines]%
\dorecurse\c_initial_lines{\nointerlineskip\hpack to \hsize{\strut}\par}%
\fi
\endgroup
\c_initial_lines\zerocount
\ifconditional\c_initial_synchronize
\removetoks \forgetinitial \from \everybeforepar
\fi
\fi}
%D \starttyping
%D \setupinitial[n=2,style=\tfd,location=text]
%D \setuphead[chapter][after=\placeinitial]
%D \enableexperiments[autoforgetinitials]
%D
%D \starttext
%D \chapter{Test me} Hello world!
%D %\forgetinitial \input tufte
%D \input tufte
%D \stoptext
%D \stoptyping
% \enableexperiments[autoforgetinitials]
\installtexexperiment
{autoforgetinitials}
{\settrue \c_initial_synchronize}
{\setfalse\c_initial_synchronize}
% \setupbodyfont[dejavu,9pt]
%
% \startbuffer
% \setinitial[two] D. E. Knuth \ignorespaces\input knuth \par
% \setinitial[two] Knuth \ignorespaces\input knuth \par
% \setinitial[two] \quotation{D. E. Knuth} \ignorespaces\input knuth \par
% \setinitial[two] \quotation {Knuth} \ignorespaces\input knuth \par
% \setinitial[two] [text={D.E. Knuth}] \ignorespaces\input knuth \par
% \setinitial[two] [m=4] D. E. Knuth \ignorespaces\input knuth \par
% \stopbuffer
%
% \type{m=2} \start \defineinitial[two][m=2,method=none] \getbuffer \page \stop
% \type{m=1,method=auto} \start \defineinitial[two][m=1,method=auto] \getbuffer \page \stop
% \type{m=1,method={auto,first,last}} \start \defineinitial[two][m=1,method={first,auto,last}] \getbuffer \page \stop
\protect \endinput
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