%D \module
%D   [       file=typo-adj,
%D        version=2021.11.02,
%D          title=\CONTEXT\ Typesetting Macros,
%D       subtitle=Adjusters,
%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.

% This is preliminary (mostly test) code ... for it to be useful we also need to
% add some spacing options as well as penalty control. So far I never needed this
% but who knows.

\writestatus{loading}{ConTeXt Typesetting Macros / Adjusters}

\registerctxluafile{typo-adj}{autosuffix}

% \definesystemattribute[adjuster][public]

\unprotect

%D \starttyping
%D \start \showboxes
%D     \dorecurse{20}{test #1 }
%D     \insertlinebefore{BEFORE 1}
%D     \insertlineafter {AFTER  1}
%D     \dorecurse{20}{test #1 }
%D     \dorecurse{20}{test #1 }
%D     \insertlinebefore{BEFORE 2}
%D     \insertlineafter {AFTER  2}
%D     \dorecurse{20}{test #1 }
%D \stop
%D \stoptyping

\def\typo_adjusters_line#1% no need for speed
  {\begingroup
   \dowithnextbox
      {\ht\nextbox\strutht
       \dp\nextbox\strutdp
      %\boxattribute\nextbox \adjusterattribute \plusone
       \vadjust #1 index \plusone {\box\nextbox}%
       \endgroup}%
      \hbox}

\tolerant\def\typo_adjusters_blank#1[#2]% no need for speed
  {\begingroup
 % \setbox\scratchbox\vbox{\ifcstok{#2}\emptytoks\blank\else\blank[#2]\fi}%
   \setbox\scratchbox\vbox{\blank[#2]}%
   \vadjust #1 index \plustwo {\vskip\htdp\scratchbox}%
   \endgroup}

\permanent\protected\def\insertlinebefore{\typo_adjusters_line{pre}}
\permanent\protected\def\insertlineafter {\typo_adjusters_line{post}}

\permanent\protected\def\insertblankbefore{\typo_adjusters_blank{pre}}
\permanent\protected\def\insertblankafter {\typo_adjusters_blank{post}}

\protect \endinput