Fix Source Sans font compatibility with variable fonts and TeX Live fallback#624
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renaudguerin wants to merge 1 commit into
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Fix Source Sans font compatibility with variable fonts and TeX Live fallback#624renaudguerin wants to merge 1 commit into
renaudguerin wants to merge 1 commit into
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The current font configuration expects separate static font files for each weight (e.g. "Source Sans 3 Light", "Source Sans 3 Bold"), which are not found when only variable fonts are installed. Modern package managers (Homebrew, Google Fonts) ship Source Sans 3 exclusively as variable fonts, causing build failures on macOS and other platforms. Use fontspec RawFeature axis syntax to select weights from variable fonts, and fall back to "Source Sans Pro" (bundled with TeX Live) when "Source Sans 3" is not installed at all. This supports: - Variable fonts from Homebrew/Google Fonts - Static "Source Sans 3" from Adobe or Linux distro packages - Static "Source Sans Pro" from TeX Live (Overleaf, Docker, etc.) Fixes posquit0#606, fixes posquit0#610 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
RawFeature={+axis={wght=N}}syntax, fixing builds when only variable fonts are installed (e.g. via Homebrewfont-source-sans-3, or Google Fonts)texlive/texlive:latest), and vanilla TeX Live installsProblem
Since commits 852b042 and f05fc68, the template requires "Source Sans 3" as separate static font files per weight ("Source Sans 3 Light", "Source Sans 3 Bold", etc.). However:
.ttfwith awghtaxis) — named variants like "Source Sans 3 Light" don't exist as separate fonts, so the build also failsSolution
Uses
\IfFontExistsTF{Source Sans 3}to detect which font is available:RawFeature={+axis={wght=N}}to select weights from the variable font. This syntax is harmlessly ignored by static fonts, so it also works with static "Source Sans 3" installs (e.g.adobe-source-sans-fontson Arch Linux).Font=*-Light/Font=*-LightItalicsyntax that worked before.Tested with
SourceSans3[wght].ttf) ✅Note
Roboto is left unchanged — it is bundled as static OTFs in TeX Live and works everywhere with the existing configuration.
Fixes #606, fixes #610