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%D \module
%D [ file=typo-shp,
%D version=2021.02.27, % was meta-txt / meta-imp-txt / 2000.07.06
%D title=\CONTEXT\ Typesetting Macros,
%D subtitle=Paragraph Shapes,
%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.
%D I finally decided to move some of the code written in 2000 for the
%D \METAFUN\ manual to its own core module. Of course it got adapted
%D to the way \LMTX\ does things.
\writestatus{loading}{ConTeXt Spacing Macros / Paragraph Shapes}
\registerctxluafile{typo-shp}{autosuffix}
\unprotect
%D Something new (experimental and evolving):
%D
%D \starttyping
%D \parshape
%D 3
%D options 1 % repeat
%D 0cm 10cm 2cm 8cm 4cm 6cm
%D lots of text
%D \stoptyping
%D
%D \starttyping
%D \parshape 4 5mm 125mm 0mm 120mm 5mm 125mm 0mm 120mm
%D \pushparagraphtweak {repeat}
%D verse line 1\crlf
%D verse line 2\crlf
%D verse line 3\crlf
%D verse line 4\par
%D etc
%D \popparagraphtweak
%D \stoptyping
%D But we wrap this in a more abstract interface:
\installcorenamespace {parshapes}
\installcorenamespace {shapedparagraph}
\installbasicnativeautosetuphandler \??shapedparagraph {shapedparagraph}
\setupshapedparagraph
[\c!method=,
\c!list=,
\c!lines=\zerocount,
\c!mp=,
\c!repeat=,
\c!hoffset=\zeropoint,
\c!voffset=\zeropoint,
\c!distance=\zeropoint]
\permanent\protected\lettonothing\stopparagraphshape
\permanent\protected\def\startparagraphshape[#1]#2\stopparagraphshape
{\gdefcsname\??parshapes#1\endcsname{#2}} % global
\permanent\protected\def\rawparagraphshape#1%
{\begincsname\??parshapes#1\endcsname}
\permanent\protected\def\setparagraphshape[#1]%
{\ifcsname\??parshapes#1\endcsname
\expandafter\clf_setparagraphshape\lastnamedcs done\relax
\fi}
\def\spac_shapes_calculate#1% called locally in \LUA
{\startMPcalculation \includeMPgraphic{#1} \stopMPcalculation}
% \permanent\protected\tolerant\def\startshapedparagraph[#1]% no grouping
% {\begingroup
% \lettonothing\currentshapedparagraph
% \setupshapedparagraph[#1]%
% \edef\p_mp {\shapedparagraphparameter\c!mp}%
% \edef\p_repeat{\shapedparagraphparameter\c!repeat}%
% \setlocalhsize
% \normalexpanded
% {\endgroup
% \ifempty\p_mp
% \setparagraphshape[\shapedparagraphparameter\c!list]%
% \else
% \setparagraphmetashape[\shapedparagraphparameter\c!mp][\ifx\p_repeat\v!yes repeat\fi]%
% \fi
% \pushparagraphtweak{\shapedparagraphparameter\c!method}\relax}}
\newbox\b_spac_shapes
\def\spac_shapes_list
{\edef\p_mp {\shapedparagraphparameter\c!mp}%
\edef\p_repeat{\shapedparagraphparameter\c!repeat}%
\normalexpanded
{\endgroup
\ifempty\p_mp
\setparagraphshape[\shapedparagraphparameter\c!list]%
\else
\setparagraphmetashape[\p_mp][\ifx\p_repeat\v!yes repeat\fi]%
\fi
\pushparagraphtweak{\shapedparagraphparameter\c!method}\relax}}
\def\spac_shapes_text
{\getnoflines{\dimexpr\htdp\b_spac_shapes+\shapedparagraphparameter\c!voffset}%
\normalexpanded
{\endgroup
\clf_setparagraphshape
left \the\dimexpr
\wd\b_spac_shapes+\shapedparagraphparameter\c!distance
+\shapedparagraphparameter\c!hoffset
\relax
right \zeropoint
copy \the\numexpr
\noflines
+\shapedparagraphparameter\c!lines
\relax
left \zeropoint
right \zeropoint
% inspect
done
\relax
\pushparagraphtweak{shift}%
\dontleavehmode
\vtop
xoffset \the\dimexpr
-\shapedparagraphparameter\c!distance
-\wd\b_spac_shapes
\relax
yoffset \the\dimexpr
\shapedparagraphparameter\c!voffset
+\strutht
\relax
{\smashbox\b_spac_shapes
\box\b_spac_shapes}}}
\def\spac_shapes_lines
{\normalexpanded
{\endgroup
\clf_setparagraphshape
left \shapedparagraphparameter\c!width
right \zeropoint
copy \shapedparagraphparameter\c!lines
left \zeropoint
right \zeropoint
% inspect
done
\relax
\pushparagraphtweak{shift}}}
\permanent\protected\tolerant\def\startshapedparagraph[#1]% no grouping
{\begingroup
\lettonothing\currentshapedparagraph
\setupshapedparagraph[#1]%
\setlocalhsize
\doifsomething{\shapedparagraphparameter\c!text}
{\global\setbox\b_spac_shapes\vpack\bgroup
\forgetall
\shapedparagraphparameter\c!text
\egroup}%
\ifvoid\b_spac_shapes
\ifnum\shapedparagraphparameter\c!lines>\zerocount
\spac_shapes_lines
\else
\spac_shapes_list
\fi
\else
\spac_shapes_text
\fi
\ignorespaces}
\permanent\protected\def\stopshapedparagraph
{\popparagraphtweak}
%D As it is not much code we now put it here:
\newbox \shapetextbox
\newinteger\shapetextindex
\permanent\protected\def\startshapetext[#1]%
{\begingroup
\global\shapetextindex\zerocount
\global\setbox\shapetextbox\vbox\bgroup
\setparagraphmetashape[#1]%
\forgetall
\dontcomplain
\setuptolerance[\v!verytolerant,\v!stretch]% default
% \setuplayout[\c!grid=\v!yes]% goes wrong, we need a local one
\pushparagraphtweak{shift}}
\permanent\protected\def\stopshapetext
{\popparagraphtweak
\egroup
\endgroup}
% \permanent\protected\def\getshapetext
% {\vbox\bgroup
% \forgetall
% \dontcomplain
% \global\advanceby\shapetextindex\plusone
% \scratchcounter\getshapeparameter{lines}\relax
% \ifnum\scratchcounter>\zerocount
% \scratchwidth \getshapeparameter{width}\scaledpoint\relax
% \scratchheight \getshapeparameter{height}\scaledpoint\relax
% \setbox\scratchbox\vpack to \scratchheight
% {\splittopskip\strutheight
% \vskip\dimexpr\getshapeparameter{voffset}\scaledpoint\relax
% \ifcase\numexpr\getshapeparameter{first}\relax\else
% \vskip\lineheight
% \fi
% \hskip\dimexpr\getshapeparameter{hoffset}\scaledpoint\relax
% \hpack{\vsplit\shapetextbox to \scratchcounter\lineheight}}%
% \wd\scratchbox\scratchwidth
% \ht\scratchbox\scratchheight
% \dp\scratchbox\zeropoint
% \box\scratchbox
% \else
% % what now
% \fi
% \egroup}
\permanent\protected\def\getshapetext
{\vbox\bgroup
\forgetall
\dontcomplain
\global\advanceby\shapetextindex\plusone
\scratchcounter\getshapeparameter{lines}\relax
\ifnum\scratchcounter>\zerocount
\scratchwidth \getshapeparameter{width}\scaledpoint\relax
\scratchheight \getshapeparameter{height}\scaledpoint\relax
\scratchhoffset\dimexpr\getshapeparameter{hoffset}\scaledpoint\relax
\scratchvoffset\dimexpr\getshapeparameter{voffset}\scaledpoint\relax
\setbox\scratchbox\vpack to \scratchheight
{\splittopskip\strutheight
\vskip\scratchvoffset
\ifcase\numexpr\getshapeparameter{first}\relax\else
\vskip\lineheight
\fi
\hskip\scratchhoffset
\hpack{\vsplit\shapetextbox to \scratchcounter\lineheight}}%
\wd\scratchbox\dimexpr\scratchwidth +\scratchhoffset\relax
\ht\scratchbox\dimexpr\scratchheight+\scratchvoffset\relax
\dp\scratchbox\strutdp % zeropoint
\box\scratchbox
\else
% what now
\fi
\egroup}
\protect
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