typescripts

[Michael Saunders <odradek5@gmail.com>]

I have been earnestly trying to understand how they work by attempting
a slightly more complex one.

So far, I have:

-------------------------------------------------------
\definefontfeature[default][mode=node,language=dflt,script=latn,kern=yes,liga=yes,tlig=yes,trep=yes]
\definefontfeature[body][onum=yes,pnum=yes,protrusion=quality,expansion=quality]%turn
hz on
%plus some I hope to use later
\definefontfeature[tabular][sans=yes,tnum=yes,onum=yes]%turn hz off
\definefontfeature[allcaps][cpsp=yes,case=yes,lnum=yes]
\definefontfeature[smallcaps][smcp, onum=yes]
\definefontfeature[swashes][swsh=yes]
\definefontfeature[inferior][sinf=yes]
\definefontfeature[superior][sups, ordn=yes]
\definefontfeature[numerator][numr=yes]
\definefontfeature[denominator][dnom=yes]
\definefontfeature[prop-os][pnum=yes,onum=yes]
\definefontfeature[prop-lin][pnum=yes,lnum=yes]
\definefontfeature[tab-os][tnum=yes,onum=yes]
\definefontfeature[tab-lin][tnum=yes,lnum=yes]
\definefontfeature[ornaments][ornm=yes]
\definefontfeature[lgc][script=latn,script=grek,script=cyrl]

\starttypescript [serif] [junicode]
   \definefontsynonym[Junicode][name:junicode][features=default,features=body,features=lgc]
   \definefontsynonym[Junicode-Bold][name:junicodebold][features=default,features=body,features=lgc]
   \definefontsynonym[Junicode-Italic][name:junicodeitalic][features=default,features=body,features=lgc]
   \definefontsynonym[Junicode-BoldItalic][name:junicodebolditalic][features=default,features=body,features=lgc]
\stoptypescript

\starttypescript [serif] [junicode]
   \definefontsynonym[Serif][Junicode][features=default,features=body,features=lgc]
   \definefontsynonym[SerifBold][Junicode-Bold][features=default,features=body,features=lgc]
   \definefontsynonym[SerifItalic][Junicode-Italic][features=default,features=body,features=lgc]
   \definefontsynonym[SerifBoldItalic][Junicode-BoldItalic][features=default,features=body,features=lgc]
\stoptypescript

\starttypescript [junicode]
   \definetypeface [junicode] [rm] [serif] [junicode] [default]
[features=default,features=body,features=lgc,features=hanging,features=hz]
\stoptypescript

\setupalign[hanging,hz]
\setupbodyfont[junicode,12pt]
-------------------------------------------------------------------------

but,

1. tlig and trep aren't working, so evidently, features=default isn't
getting through.  No hanging or hz is happening either---probably the
same problem.

2. As far as I can tell from trying to decode examples, there is some
hidden connection between the first arguments of the second typescript
block and the font switches.  So, for example, a secret connection
between SerifBoldItalic and \bi seems to connect Junicode-BoldItalic
to \bi.  Fine, but, in all the examples I've seen, there are no more
than two weights and no widths.  In some cases, I have five weights
(light, book, medium, semi-bold, bold).  How do I set up the
typescript for this and the switches in the text?  Must I learn more
pairs like (SerifBoldItalic, \bi)?
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