%D \module
%D   [      file=s-braille-basic,
%D        version=2021.11.17,
%D          title=\CONTEXT\ Style File,
%D       subtitle=Playground for spacing,
%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 This style is triggered by the 2021 blog by Murray Sargent (from Microsoft)
%D about nemeth sequences:
%D
%D \starttyping
%D https://devblogs.microsoft.com/math-in-office/unicode-math-braille-sequences/
%D \stoptyping
%D
%D I ran into it when Mikael Sundqvist and I were working on an upgrade of the lfg
%D (goodie) files for math. Being sort of monospaces a braille font is a good
%D candidate for exploring al these math spacing parameters.
%D
%D More settings might show up and existing ones might change so it's mostly an
%D example style. Fell free to contribute. We use color so that we can see what
%D we're dealing with. Braille looks kind of interesting anyway although it was
%D never meant to be seen but felt.
%D
%D Musical timestamp: Nothing but the truth (PT with GH drum cam 5.1 bluray) ...
%D ... I'm always amazed of the power of music and wonder how that evolved with
%D and in humans.

\startmodule[braille-basic]

\unprotect

\definemeasure [braille:margin]  [\paperheight/15]

\definelayout
  [braille]
  [\c!topspace=\measure{braille:margin},
   \c!bottomspace=\measure{braille:margin},
   \c!backspace=\measure{braille:margin},
   \c!header=\measure{braille:margin},
   \c!footer=\zeropoint,
   \c!width=\v!middle,
   \c!height=\v!middle]

\setuplayout
  [braille]

\enableexperiments[fonts.compact]

\setupbodyfont
  [braille,11pt]

\setupwhitespace
  [\v!big]

\setuphead
  [\v!chapter]
  [\c!style=\bfd,
   \c!color=darkblue,
   \c!headerstate=\v!high,
   \c!interaction=\v!all]

\setuphead
  [\v!section]
  [\c!style=\bfc,
   \c!color=darkblue]

\setuphead
  [\v!subsection]
  [\c!style=\bfb]

\setuphead
  [\v!subsubsection]
  [\c!style=\bfa,
   \c!after=]

\setuplist
  [\c!interaction=\v!all]

\setupdocument
  [\c!before=\directsetup{document:titlepage}]

\setupalign
  [\v!verytolerant,\v!flushleft]

\setupitemgroup[\v!itemize][1][\c!width=4em,\c!style=\s!bold,\c!color=darkred]
\setupitemgroup[\v!itemize][2][\c!width=5em,\c!style=\s!bold,\c!color=darkred]
\setupitemgroup[\v!itemize][3][\c!width=6em,\c!style=\s!bold,\c!color=darkred]

\setuptyping
  [\c!color=darkyellow]

\setuptype
  [\c!color=darkyellow]

\setupformulas
  [\c!color=darkgreen]

\protect

\stopmodule

\continueifinputfile{s-braille-basic.mkxl}

\starttext

\showframe \showglyphs \showboxes \dontcomplain

\startchapter[title=The first]

\startsection[title=Tufte] {\tf \samplefile{tufte}\par} \stopsection
\startsection[title=Ward]  {\bf \samplefile{ward} \par} \stopsection
\startsection[title=Davis] {\bi \samplefile{davis}\par} \stopsection

\startsection[title=Four]

    Here is some simple inline math: \formula {x_2 = 10 \neq \alpha} and here is
    some (quick and dirty) display:

    \startformula
        y = \sqrt[2]{\frac{1+x^2}{2x+x^2+4}}
    \stopformula

    but there are rules for that. So we need to look into those so that:

    \startformula
        y = \frac{1+x^2}{2x+x^2+4}
    \stopformula

    and

    \startformula
        y = \overline{2x+x^2+4} + \underline{2x+x^2+4}
      % y = \overbar{2x+x^2+4}
    \stopformula

    come out right.

\stopsection

\stopchapter

\startchapter[title=The second]

The monospaced font has no braille but actually all is kind of monospace apart
from spacing:

\starttyping
Let's show some {\bf fancy tex} code,
assuming that mono has gotten the
braille glyphs.
\stoptyping

And some itemize:

\startitemize[n]
    \startitem first one \stopitem
    \startitem second one \stopitem
\stopitemize

\startitemize
    \startitem first one \stopitem
    \startitem second one \stopitem
\stopitemize

\startitemize[a]
    \startitem first one \stopitem
    \startitem second one \stopitem
\stopitemize

\stopchapter

\stoptext