Hello there,

I had mentioned this on a thread some (long) time ago, finally got 
around to finishing a first version of a typescript with the Adobe 
Source font family, in all its weight alternatives and design sizes (the 
latter being available in the Serif style only).

Comments welcome. If it looks good I can upload it to the wiki, on the 
Typescripts_examples page I guess.

(I have Questions For the Experts further down...)


About Adobe Source
==================

The fonts are available on GitHub [1]. They are the descendants of the 
Source {Serif,Sans,Code} Pro fonts described in the type-imp-source.mkiv 
typescript available in the ConTeXt distribution. Due to major changes, 
Serif Pro was renamed into Serif 4 in, well, its version 4 [2] (that’s 
the version that introduces design sizes, a.k.a. optical sizes), and 
Sans Pro was renamed into Sans 3 [3].

[1] https://github.com/adobe-fonts/
[2] https://github.com/adobe-fonts/source-serif/releases/tag/4.004R
[3] https://github.com/adobe-fonts/source-sans/issues/192


Usage
=====

Short version: store the attached typescript and its helper Lua files 
somewhere on your file system where ConTeXt will find them ($HOME/texmf 
for example), then use in your document:

     \setupbodyfont[adobesource]

Long version: The default typescript name is adobesource (also available 
as adobesource-regular) and has design sizes enabled.

Each weight is also available: adobesource-extralight, 
adobesource-light, etc., all the way to adobesource-black. There is also 
a medium weight, that selects the regular versions of Serif and Sans, 
but the medium version of Mono (just slightly bolder than the regular 
one, presumably for better on-screen rendering in terminals).

Design sizes can be disabled by adding -nodesignsize- to the typescript 
name: adobesource-nodesignsize-extralight, etc.

Finally, I thought it would be cool to over-engineer the typescript a 
little bit and provide direct access to the design sizes (in case one 
would want a narrower version for body text, or a bolder and more 
expanded version for titles, etc.). Here they are, again in all their 
weights: adobesource-caption-extralight, adobesource-smtext-light, 
adobesource-subhead, adobesource-display-bold, etc. The ‘regular’ design 
size is accessed by simply using adobesource-nodesignsize.


Questions For the Experts
=========================

To avoid a gigantic typescript file with a lot of duplication, I 
offloaded the font filename calculation to a Lua function (see attached 
adobesource.lua). I initially wanted to put the Lua code inside the 
typescript, but then I had all sorts of weird Lua compilation errors. 
The very same code works fine when included in a normal document though. 
Could it be that typescripts are processed in some special mode that 
doesn’t like Lua syntax? As a workaround, I put the code in an external 
file and require it from inside the typescript.

In the goodies file, I use what I believe is the largest possible font 
size that can be used in ConTeXt (16,383pt) to select the Display design 
size. Otherwise, text above that size will fall back to the default, 
regular design size.

Now, since I use the goodies file only when design sizes are enabled, I 
thought I could make it more robust by using AdobeSource4Display as a 
default, that is, for any size above 16.5pt. However, if I mix design 
sizes enabled and disabled in a document, the disabled one seems to be 
using the goodies file even though it’s not mentioned in the typescript. 
Any idea of why? For example:

\usetypescriptfile[adobesource]
\usebodyfont[adobesource]
\setupbodyfont[adobesource-nodesignsize]
\starttext
This text is typeset in Display when Regular should be used.

\switchtobodyfont[adobesource]
This text is typeset in Regular with design sizes enabled.
\stoptext


What’s Next
===========

* A harmonious-looking companion math font.
* A harmonious-looking companion math font that uses glyphs from Adobe 
Serif 4 when available.


Thanks,
Vincent