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%D \module
%D [ file=anch-loc,
%D version=2021.05.27,
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Local Positioning Support,
%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 Anchoring Macros / Local Positioning}
%D This is a typical \LMTX\ feature that could have been provided in \MKIV\ but I
%D never finished it there. In \LMTX\ we have already a bit better infrastructure
%D for it.
%D
%D When watching the brilliant positive yt videos of Yoyoka Soma (よよか) drum
%D performances one realizes that a covers can improve the original. Let's see if
%D this module can improve some of the position related mechanisms. (Btw, quite
%D often covers impress me more than originals I'd never list too anyway.)
% todo:
%
% - make box fit and inject glue
% - set height / depth or just insert something between
\registerctxluafile{anch-loc}{autosuffix}
\unprotect
\aliased\let\syncanchor \gobblethreearguments
\aliased\let\alignanchor\gobblefourarguments
\aliased\let\markanchor \gobblethreearguments
\permanent\protected\def\anch_local_withanchor_s #1#2#3{\leftboundary\setlocalsyncanchor {#1} #2 #3\rightboundary}
\permanent\protected\def\anch_local_withanchor_a#1#2#3#4{\leftboundary\setlocalalignanchor{#1} #2 #3{#4}\rightboundary}
\permanent\protected\def\anch_local_withanchor_n #1#2#3{\leftboundary\setlocalmarkanchor {#1} #2 #3\rightboundary}
\permanent\protected\def\anch_local_withanchor_t #1#2#3{\anch_local_withanchor_n{#1}{#2}{#3}\smash[whd]{\smallinfofont\number#2-\number#3}}
\permanent\protected\def\setlocalanchoring
{\enforced\let\syncanchor \anch_local_withanchor_s
\enforced\let\alignanchor\anch_local_withanchor_a
\enforced\let\markanchor \anch_local_withanchor_m}
\let\anch_local_withanchor_m\anch_local_withanchor_n
\installtextracker{localanchor}
{\let\anch_local_withanchor_m\anch_local_withanchor_t}
{\let\anch_local_withanchor_m\anch_local_withanchor_n}
\permanent\protected\lettonothing\stopanchoring
\permanent\protected\def\startanchoring#1\stopanchoring % todo: boundary
{\begingroup
\pushlocalanchors
\setlocalanchoring
\setbox\scratchbox\vbox{\settrialtypesetting#1}%
\analyzelocalanchors\scratchbox
\vbox{#1}%
\poplocalanchors
\endgroup}
\permanent\protected\lettonothing\stopsynchronizing
\permanent\protected\def\startsynchronizing#1\stopsynchronizing % todo: boundary
{\begingroup
\pushlocalanchors
\setlocalanchoring
\setbox\scratchbox\vbox{#1}%
\synchronizelocalanchors\scratchbox
\unvbox\scratchbox
\poplocalanchors
\endgroup}
% variant on \sync (defined at the lua end)
\permanent\protected\def\autosync#1#2{\leftboundary\sync{#1}{#2}\rightboundary}
% \startsynchronizing
% $a = a + a $\par
% $a \mathsnc{1}= a + a $\par
% $ \mordsnc{1}= a + a + a $\par
% $ \mordsnc{1}= a \mathsnc{2}+ a + a + a$\par
% $ \mordsnc{1} \mordsnc{2}+ a + a + a$
% \stopsynchronizing
\permanent\protected\def\mathsync#1{\sync{m}{#1}}
\permanent\protected\def\mordsync#1{\mathord{}\sync{m}{#1}}
\permanent\protected\def\mrelsync#1{\mathrel{}\sync{m}{#1}}
\permanent\protected\def\mbinsync#1{\mathbin{}\sync{m}{#1}}
\setlocalanchoring
%D These are defined at the \LUA\ end.
%D
%D \starttyping
%D \pushlocalanchors
%D \poplocalanchors
%D \analyzelocalanchors
%D \synchronizelocalanchors
%D \setlocalsyncanchor {name} x y | {name} {x} {y}
%D \setlocalmarkanchor {name} x y | {name} {x} {y}
%D \localanchorx {name} x y | {name} {x} {y}
%D \localanchory {name} x y | {name} {x} {y}
%D \sync {name} x | {name} {x}
%D \stoptyping
% \permanent\def\anchorxy#1#2#3{(\todimension\localanchorx{#1} #2 #3,\todimension\localanchory{#1} #2 #3)}
\protect \endinput
% Musical timestamp: Nightwish Decades bluray in loop mode.
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