Give the page the fonts gpui stopped bundling - #65
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The last revision bump (#63) took `gpui_web`'s bundled fonts out: it used to embed IBM Plex Sans and Lilex and add them as it built the platform, and now it builds `CosmicTextSystem::new_without_system_fonts` with the note that applications must add their own before opening a window. A browser hands wasm no font files, so the published page's font database was empty. `TextSystem::resolve_font` panics when neither the family nor a fallback resolves, so the first frame trapped on `.SystemUIFont` — and a wasm trap unwinds nothing, so every `RefCell` gpui held across that frame stayed borrowed for the life of the page. What production reported is one panic naming a font followed by hundreds naming a cell, from a window that never drew, while the session behind it connected, hydrated and synced perfectly. So the eight faces are vendored here, from the revision that bundled them, and `platform::fonts` adds them before the window opens — a no-op on the desktop, where font-kit reads the system's own families. Which two families is decided upstream rather than by taste: `font_name_with_fallbacks` maps `.ZedSans` to IBM Plex Sans and `.ZedMono` to Lilex, and the web platform passes IBM Plex Sans as what `.SystemUIFont` resolves to. It is held by `cargo test` rather than by a browser, and honestly: the tests build a `gpui::TextSystem` over the same `new_without_system_fonts` with the same system-font name, so a family a page cannot resolve is one they cannot resolve either. One of them is the failure itself — with nothing added, `.SystemUIFont` panics — and one covers the fallback, since gpui-component's default mono family here is "DejaVu Sans Mono" and no page has that either. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SnMdYywNCEWxxNaEFzmuJp
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📝 WalkthroughWalkthroughThe GUI now initializes platform fonts and bundles IBM Plex Sans and Lilex for wasm. Tests validate font loading and fallback resolution without system fonts. License files document the bundled fonts. ChangesWeb Font Bundling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The dependency update requires Rust 1.95 while the repository still declares and tests against Rust 1.94, so the project cannot build under its published MSRV. Merge readiness requires updating that support promise and CI or pinning a compatible revision. Poem
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✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 3 files. (4 skipped: 4 unsupported.)
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In `@crates/gui/Cargo.toml`:
- Line 162: Resolve the Rust toolchain mismatch for the gpui_wgpu dependency:
either raise the project’s declared MSRV and matching CI toolchain to Rust 1.95
or newer, or pin gpui_wgpu to a Zed revision compatible with Rust 1.94. Keep the
dependency and toolchain declarations consistent.
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⛔ Files ignored due to path filters (9)
Cargo.lockis excluded by!**/*.lockcrates/gui/assets/fonts/ibm-plex-sans/IBMPlexSans-Italic.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/ibm-plex-sans/IBMPlexSans-Regular.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/ibm-plex-sans/IBMPlexSans-SemiBold.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/ibm-plex-sans/IBMPlexSans-SemiBoldItalic.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/lilex/Lilex-Bold.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/lilex/Lilex-BoldItalic.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/lilex/Lilex-Italic.ttfis excluded by!**/*.ttfcrates/gui/assets/fonts/lilex/Lilex-Regular.ttfis excluded by!**/*.ttf
📒 Files selected for processing (7)
AGENTS.mdcrates/gui/Cargo.tomlcrates/gui/assets/fonts/ibm-plex-sans/license.txtcrates/gui/assets/fonts/lilex/OFL.txtcrates/gui/src/main.rscrates/gui/src/platform/fonts.rscrates/gui/src/platform/mod.rs
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main gained #65, #67 and #68 while this branch was open. Only AGENTS.md conflicted, in one hunk: #68 added twenty lines to the shared-memory gotcha, describing Web Audio as the third crossing to hit the rule and the `clippy.toml` ban that now enforces it. Resolved by putting that prose where the entry now lives -- appended to the shared-memory gotcha in docs/gotchas.md, verbatim, all twenty lines checked present -- and keeping this branch's restructured AGENTS.md for the file itself. The `clippy.toml` ban did not stay only in the reference, though. "Do not write this spelling, and CI's `Test (web)` job fails you if you do" is a decision that changes what an agent may type, which is what the always-loaded file is for, so the shared-memory rule in AGENTS.md now names it and says where the rule runs. Everything else merged clean. main's own files are byte-identical to origin/main in the tree apart from two comment retargets this branch had already made (Cargo.toml's cache measurement now names docs/ci.md, its profile note docs/web.md). Worth recording: #67 raised the MSRV to 1.95 and nothing in these documents had to change, because none of them pins a toolchain version any more. That is the split doing its job on its first contact with a moving base. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KxsJVCeKUx3xFiGM92sPn6
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The published page has not drawn a pixel since #63. A production log from
https://oxidezap.github.io/client/ is one panic naming a font followed by
hundreds naming a cell, over a session that connects, hydrates 95 chats and
syncs perfectly underneath it.
Where it entered
#63 moves only
Cargo.lock, gpui399258f→76b1096. In that rangegpui_webstopped bundling fonts. It used to embed IBM Plex Sans and Lilexand add them as it built the platform; now it builds
CosmicTextSystem::new_without_system_fonts("IBM Plex Sans")under a newdoc comment: "The platform starts with an empty font database. Applications
must add fonts through
gpui::App::text_systembefore opening a window."A browser hands wasm no font files, so nothing else was going to fill it.
Why the log looks like two failures
It is one.
TextSystem::resolve_fontpanics when neither the family norany fallback resolves — that is the first entry,
text_system.rs:158,.SystemUIFont. A wasm trap unwinds nothing, so everyRefCellgpui heldacross that frame stayed borrowed for the life of the page: the
RefCell already borrowedflood fromasync_context.rs:65/:167andgpui::windowis the consequence, not a second bug.The fix
The eight faces, vendored from the revision that bundled them, and
platform::fontsadding them before the window opens — a no-op on thedesktop, where font-kit reads the system's own families. Which two families
is decided upstream rather than by taste:
font_name_with_fallbacksmaps.ZedSansto IBM Plex Sans and.ZedMonoto Lilex, and the web platformpasses IBM Plex Sans as what
.SystemUIFontresolves to. About 1.6 MB ofassets, which is what the module carried before #63 rather than a new cost.
What holds it
cargo test, and honestly rather than by proxy: the tests build agpui::TextSystemover the samenew_without_system_fontswith the samesystem-font name, so a family a page cannot resolve is one they cannot
resolve either.
a_page_that_adds_no_fonts_cannot_draw_at_all—#[should_panic], theproduction failure itself.
the_families_a_page_asks_for_all_resolve—.SystemUIFont,.ZedSans,.ZedMono, and "DejaVu Sans Mono", which is gpui-component's default monofamily here and which no page has, so it is the one that proves the
fallback chain still lands somewhere.
every_bundled_face_is_a_font_on_its_own— each file loads alone, so atruncated asset is not hidden by the other seven.
Verified locally: those three pass, the crate's other 250 tests pass,
cargo +nightly check -p oxidezap-gui --target wasm32-unknown-unknown -Z build-stdcompiles, and clippy gains no finding from this diff.One thing left alone
The same bump takes the tree past its stated MSRV: gpui at
76b1096usesstd::hint::cold_path, stable since Rust 1.95, whilerust-versionis1.94and themsrvCI job pins "1.94". Reproduced with a 1.94 toolchain,which cannot compile
gpuiat all. Raising a published MSRV is a promise tochange deliberately, so it is not in this diff.
Generated by Claude Code
Summary by cubic
Fixes the published page drawing nothing since #63, when
gpui_webstopped bundling the page's fonts. Vendors the eight IBM Plex Sans and Lilex facesgpui_webused to embed and loads them before the window opens, so the text system can resolve fonts again.A browser gives wasm no font files, so the old behavior was a panic on the first frame leaving the page wedged with "RefCell already borrowed" even while the session behind it kept syncing.
Bug Fixes
platform::fontscall that is a no-op on desktop, where the system's own families are used.gpui_webcarried before Move the library, gpui and gpui-component to their latest revisions #63..ZedSansmaps to IBM Plex Sans,.ZedMonoto Lilex, and the web backend passes IBM Plex Sans as.SystemUIFont.cargo test, not a browser: the tests build agpui::TextSystemover the samenew_without_system_fonts, so a family a page cannot resolve is one the tests cannot resolve either.Written for commit e9ad72d. Summary will update on new commits.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation