Iosevka Charon

Iosevka Charon is a quasi-proportional font excellent for technical writing and dense UI. Iosevka Charon Mono is a true monospace font tuned for coding and terminal use. This repository builds each family from scratch and publishes TTFs with every release. Its unique contribution is that it takes the upstream Iosevka source code by Belleve Invis and builds it in a way that makes the resulting fonts Google Fonts compliant.

Building and testing

Clone via git clone --depth 10 --branch main https://github.com/jul-sh/iosevka-charon.git to avoid downloading the entire upstream history.

The Make targets rely on the Nix flake dev shell, which not only bootstraps the Python venv but also supplies the native toolchain required to build the fonts (e.g., Node, ttfautohint, and Git). If Nix is installed, make automatically enters the flake dev shell; when Nix is absent but Docker is available, the same flow runs inside the official nixos/nix container. With either tool installed, you can rely solely on the standard GNU Make entry points:

• make build – enter the Nix shell, build the fonts.
• make test – validate built fonts for Google Font compliance.
• see the Makefile for more details.

Tooling

• Nix flake in flake.nix (root) provisions Node, Python with all font processing packages, native build tools (like ttfautohint), and other supporting dependencies.
• sources/iosevka is a git subtree containing the upstream Iosevka sources and Iosveka Charon build plan.
• scripts/ contains scripts for building, and post processing to achieve Google Fonts compliance.

Repository layout

• sources/ – Iosevka subtree, build plans → unprocessed_fonts/
• scripts/ – build script and google fronts post-processing script that transform unprocessed_fonts/ → fonts/
• fonts/ – Google Fonts TTFs created by make build (gitignored)
• out/ – QA reports and proofs from make test / make proof (gitignored)
• documentation/ – specimen assets (from the Google Fonts template)
• flake.nix – Nix development environment configuration

License

Code, build tooling, and documentation are licensed under the MIT License (see LICENSE). The font files remain under the SIL Open Font License 1.1 (see OFL.txt).