tonsky / tonsky/FiraCode

Add human readable names for cvXX and ssXX font features

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Description

In my application (kitty) I am creating UI that allows users to specify what font features they want to enable, for a given face. The stylistic set and character variation font features can have optional human readable names associated with them that make much more sense than cv01 ss01 etc. See the OpenType spec FeatureParam tables for details:
https://learn.microsoft.com/en-ca/typography/opentype/spec/features_ae#tag-cv01--cv99

For ssXX features just a single name is needed. For cvXX features a name for each parameter value is also needed.

You can see Adobe Source Code Pro as an example of a font that actually names at least ssXX features.

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the OpenType FeatureParam tables linked in the issue, then compare the named Adobe Source Code Pro example. Determine how Fira Code’s font sources represent cvXX and ssXX features; done means ssXX features have human-readable names and cvXX features have names for each parameter value.

Written by the indexing model from the issue text.

Assessment

Domain
design
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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