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%D \module
%D [ file=spac-lin,
%D version=2012.01.08, % 2009.10.16 (core-ver) 1997.03.31 (core-spa)
%D title=\CONTEXT\ Spacing Macros,
%D subtitle=Vertical,
%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 Spacing Macros / Lines}
\unprotect
%D When spacing is active we need to handle commands in
%D a special way:
%D
%D \starttyping
%D \setuplines[space=on]
%D
%D \startlines
%D Let's talk about this{\ttsl\gobbleoneargument or}that.
%D \stoplines
%D
%D \startlines
%D Let's talk about this{\getvalue{ttsl}or}that.
%D \stoplines
%D \stoptyping
%D
%D One can indent in several ways:
%D
%D \starttyping
%D \setupindenting[medium] \setuplines[indenting=odd] % no yes odd even
%D
%D \startlines
%D first
%D second
%D third
%D fourth
%D \stoplines
%D \stoptyping
%D Contrary to \MKII\ we can now define classes of lines (generalized by
%D Wolfgang). I will probably rewrite bits in \LUA.
\installcorenamespace{lines}
\installcommandhandler \??lines {lines} \??lines
\setuplines
[\c!option=,
\c!command=,
\c!before=\blank,
\c!after=\blank,
\c!inbetween=\blank,
\c!indenting=\v!no,
\c!space=\v!default]
\appendtoks
\setuevalue{\e!start\currentlines}{\spac_lines_start[\currentlines]}%
\letvalue {\e!stop \currentlines }\spac_lines_stop
\to \everydefinelines
\unexpanded\def\spac_lines_start[#1]%
{\bgroup
\edef\currentlines{#1}%
\obeylines
\dosingleempty\spac_lines_start_indeed}
\let\p_lines_option\empty
\let\spac_lines_break \relax
\let\spac_after_first_obeyed_line\relax
\let\spac_lines_indent \relax
%D See \type {indentation-005.tex}:
%D
%D \starttyping
%D \setuplines[indentnext={0pt,10pt,15pt,20pt}]
%D
%D \setupindenting[yes,1em]
%D \setuplines[indentnext={0pt,*,*}]
%D
%D \setuplines[indentnext={0pt,1em,*}]
%D \starttyping
\newcount\c_spac_lines_indent_cnt
\newcount\c_spac_lines_indent_max
\newdimen\d_spac_lines_indent
\def\spac_lines_indent_indeed
{\ifnum\c_spac_lines_indent_cnt=\c_spac_lines_indent_max
\c_spac_lines_indent_cnt\plusone
\else
\advance\c_spac_lines_indent_cnt\plusone
\fi
\getfromcommacommand[\m_spac_lines_indentnext][\c_spac_lines_indent_cnt]%
\ifx\commalistelement\wildcardsymbol
\hskip\d_spac_lines_indent
\else
\scratchdimen\dimexpr\commalistelement\relax
\hskip\ifdim\scratchdimen=\zeropoint
\zeropoint
\else
\scratchdimen
\d_spac_lines_indent\scratchdimen
\fi
\fi
\relax}
\def\spac_lines_start_indeed[#1]% new: optional second argument (WS)
{\iffirstargument
\setupcurrentlines[#1]%
\fi
\edef\p_lines_option{\linesparameter\c!option}%
\ifx\p_lines_option\v!packed
\let\spac_lines_break\nobreak
\else
\let\spac_lines_break\relax
\fi
\linesparameter\c!before
\push_macro_checkindentation
\whitespace
\dostarttaggedchained\t!lines\currentlines\??lines
\begingroup
\uselinesstyleandcolor\c!style\c!color
\useindentingparameter\linesparameter
\usealignparameter\linesparameter
\typesettinglinestrue
\setupwhitespace[\v!none]% todo use fast variant
%\obeylines % move upwards to keep spaces in the first line due to optional argument
%
\edef\m_spac_lines_indentnext{\linesparameter\c!indentnext}%
\getcommacommandsize[\m_spac_lines_indentnext]%
\c_spac_lines_indent_max\commalistsize
\c_spac_lines_indent_cnt\zerocount
\ifnum\c_spac_lines_indent_max>\plusone
\letlinesparameter\c!indentnext\empty
\let\spac_lines_indent\spac_lines_indent_indeed
\d_spac_lines_indent\d_spac_indentation_par
\else
\let\spac_lines_indent\relax
\fi
%
\ignorespaces
\glet\spac_after_first_obeyed_line\spac_lines_after_first_obeyed_line_a
\let\obeyedline\spac_lines_obeyed_line
\activatespacehandler{\linesparameter\c!space}%
\dostarttagged\t!line\empty
\ignorepars}
% we could have states instead and handle option in there
\def\spac_lines_after_first_obeyed_line_a % tzt two pass, like itemize
{\linesparameter\c!command
\spac_lines_indent
\linesparameter\c!left
\glet\spac_after_first_obeyed_line\spac_lines_after_first_obeyed_line_b}
\def\spac_lines_after_first_obeyed_line_b
{\spac_lines_break
\linesparameter\c!command
\spac_lines_indent
\linesparameter\c!left}
\def\spac_lines_obeyed_line
{\ifdone\linesparameter\c!right\fi
\dostoptagged % can be a dummy one as we don't look ahead
\par
\dostarttagged\t!line\empty
\futurelet\next\spac_lines_between}
\unexpanded\def\spac_lines_stop
{\dostoptagged
\endgroup
\dostoptagged
\pop_macro_checkindentation
\linesparameter\c!after
\egroup}
\def\spac_lines_between
{\ifx\next\spac_lines_stop
\donefalse
\else
\doifelsemeaning\next\obeyedline % brrr
{\donefalse\linesparameter\c!inbetween}
{\donetrue\spac_after_first_obeyed_line}%
\fi}
\definelines[\v!lines]
\unexpanded\def\emptylines
{\dosingleempty\spac_lines_empty}
% \def\spac_lines_empty[#1]%
% {\endgraf
% \dorecurse{\iffirstargument#1\else3\fi}\crlf}
\def\spac_lines_empty[#1]%
{\endgraf
\begingroup
%\forgetall % debatable
\ifhmode
\crlf % finish the current line
\fi
\dorecurse{\iffirstargument#1\else3\fi}{\strut\crlf}%
\endgroup}
\ifdefined\startlines \else
\expandafter\let\expandafter\startlines\csname\e!start\v!lines\endcsname
\expandafter\let\expandafter\stoplines \csname\e!stop \v!lines\endcsname
\fi
\protect \endinput
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