Settings: Font card with live preview, font gallery, and line height

[teamleaderleo]

Changing the terminal font meant picking a name from a plain-text menu in the middle of the Ghostty options card, with no way to see a font before applying it. This PR puts fonts first.

Settings > Terminal now opens with a Font card:

• Live preview of a shell prompt and some code in the chosen font, size and line height. It includes the glyphs people compare fonts by: 0O 1lI |! => != -> {}[]().
• Font gallery. The Font button opens a searchable list of installed monospaced fonts, each drawn in its own face with a sample line.
  • Hovering a font previews it in the card. Clicking applies it to open terminals.
  • "Default (JetBrains Mono)" returns to Ghostty's built-in font.
• Font Size, which moved here from the options card.
• Line Height (adjust-cell-height), a percentage stepper. A pixel value set in a config file is shown as +N px.
• Thicker Strokes (font-thicken).

Every row still writes one key to cmux's Ghostty config and names a later-loading file that overrides it. The Font card and the Ghostty options card now share one TerminalGhosttyOptionsModel, so an edit in one isn't undone when the other refreshes. Settings search finds the new rows ("line height", "thicken", "change font").

Screenshots

Recorded in the app by SettingsTerminalBehaviorUITests.testFontCardShowsPreviewAndFontGallery on a CI Mac at b005102 (run https://github.com/manaflow-ai/cmux/actions/runs/36442773211): open the gallery, hover Courier New and Menlo (the preview follows), search "men", pick Menlo, step Line Height to +10%, then restore the defaults.

Hovering a font previews it	Menlo with +10% line height

ui-lab renders of the preview and gallery (scripts/ui-lab/ui-lab.py scripts/ui-lab/harnesses/terminal-font-card.swift):

Font gallery (dark)	Font gallery (light)

Preview, default font (JetBrains Mono, 13 pt):

Preview, Menlo 14 pt with +10% line height:

Preview, Courier New 16 pt:

Changelog

Added: Settings > Terminal has a Font card with a live preview, a searchable font gallery that shows each font in its own face, and Line Height and Thicker Strokes settings.

🤖 Generated with Claude Code

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Summary by cubic

Settings > Terminal now opens with a Font card that shows a live preview of shell and code in the chosen font, size, and line height, plus a searchable gallery of installed monospaced fonts drawn in their own faces.

• Hovering a font in the gallery previews it in the card; clicking applies it to open terminals, and "Default (JetBrains Mono)" restores the built-in font.
• Font Family and Font Size move out of the Ghostty options card into the new card, which also adds Line Height (adjust-cell-height) and Thicker Strokes (font-thicken) rows.
• Line-height parsing matches Ghostty: percentages (8%) or device pixels (2), with a pixel value from a config file shown as +N px; invalid spellings like 15 % are rejected.
• The Font card and the Ghostty options card share one TerminalGhosttyOptionsModel, so an edit in one isn't undone by the other's refresh.
• Rows report save failures and name the config file that overrides a written value; settings search finds the new rows.
• Adds a UI test that walks the card and restores defaults so the runner's Ghostty config is untouched.

^{Written for commit d1a7642. Summary will update on new commits.}

Summary by CodeRabbit

• New Features
  • Added terminal font settings with a live preview, a searchable monospaced font picker, and controls for font family, size, line height, and stroke thickness.
  • Added percentage- and pixel-based line-height adjustments, plus an option to thicken font strokes.
  • Terminal settings now display save failures and identify when another configuration overrides a saved value. Controls remain disabled until settings finish loading.

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📒 Files selected for processing (6)

• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyCellHeightAdjustment.swift
• Packages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/GhosttyTerminalOptionsTests.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontCard.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontFamilyPicker.swift
• Resources/Localizable.xcstrings
• cmuxUITests/SettingsTerminalBehaviorUITests.swift

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• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontCard.swift

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📝 Walkthrough

Walkthrough

The change adds Ghostty cell-height and font-thickening options, a shared model for terminal settings, and a font settings card with a live preview, searchable family picker, and controls for font family, size, line height, and stroke thickness.

Changes

Terminal font settings

Layer / File(s)	Summary
Ghostty font option contracts Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/*, Packages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/GhosttyTerminalOptionsTests.swift	Ghostty options now parse, serialize, and apply cell-height and font-thickening values. Tests cover defaults, parsing, stepping, and round trips.
Shared options model and existing controls Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Models/TerminalGhosttyOptionsModel.swift, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalGhosttyOptionsCard.swift, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalGhosttyOptionRow.swift, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalSection.swift	A shared model loads and updates Ghostty options. The existing options card uses it for its controls, and TerminalSection shares it with the font card.
Font preview, picker, and settings controls Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Models/NSFont+TerminalFamily.swift, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFont*, Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+TerminalGhosttyOptions.swift, Packages/macOS/CmuxSettingsUI/Tests/CmuxSettingsUITests/*, cmuxUITests/SettingsTerminalBehaviorUITests.swift, Resources/Localizable.xcstrings, scripts/ui-lab/harnesses/terminal-font-card.swift, scripts/ui-lab/shims/CmuxFont.swift	The font settings UI adds a preview, searchable family picker, and controls for font family, size, line height, and stroke thickness. Search entries, localizations, UI Lab harnesses, and UI tests support the settings.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant TerminalSection
  participant TerminalGhosttyOptionsModel
  participant TerminalFontCard
  participant HostActions
  TerminalSection->>TerminalGhosttyOptionsModel: Initialize and load options
  TerminalSection->>TerminalFontCard: Provide shared model
  TerminalFontCard->>TerminalGhosttyOptionsModel: Apply font option edit
  TerminalGhosttyOptionsModel->>HostActions: Save debounced option change
  TerminalGhosttyOptionsModel->>HostActions: Reload effective options

Loading

Merge Risk: 🔵 Low · up to 9a3a5

A terminal config with an extremely large percentage can crash the app when Terminal settings displays line height. This is a narrow configuration edge case with a manual config-edit workaround, so the merge risk is low but not minimal.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 9a3a5

The new font controls use the existing local settings write and reload path, and no new security boundary or verified security finding was identified. Concurrent-edit and recovery behavior is not fully established.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The observed write path affects the local user's Ghostty configuration and running terminal appearance. The inspected call chain shows no new remote or cross-tenant entrypoint.

Trust Boundaries and Controls

• observed — The new card retains the settings-to-host persistence boundary: it sends a typed option change to the shared model, and the host writes configuration and reloads Ghostty. The prior options card used the same family-change route.

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Important

Pre-merge checks failed

Please resolve all errors before merging. Addressing warnings is optional.

❌ Failed checks (3 errors, 1 warning)

Check name	Status	Explanation	Resolution
Cmux Swift Blocking Runtime	❌ Error	The PR adds Task.sleep(for: Self.writeDelay) at line 66 of the new production TerminalGhosttyOptionsModel.swift. The task runs after every option edit to delay the config write by 250 ms and coale…	Remove the production Task.sleep debounce. Persist the edit immediately, or implement coalescing with an approved cancellation-aware scheduler/timer abstraction or callback whose fire event starts the write. Do not use Task.sleep, delay…
Cmux Algorithmic Complexity	❌ Error	The PR adds an unbounded font search filter in Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontFamilyPicker.swift:23. Each query update rebuilds filteredFamilies with `fa…	Cache the filtered font list for the current trimmed query and reuse that snapshot for both the ForEach and empty-state check. Cache or precompute fontFamilyChoices when the loaded families or current selection changes instead of sortin…
Cmux Full Internationalization	❌ Error	The production Swift UI adds localization keys, but the new catalog entries are incomplete. Resources/Localizable.xcstrings already supports 20 locales (ar, bs, da, de, en, es, fr, `it…	Add translated entries for all 20 existing locales to each new key in Resources/Localizable.xcstrings. Route the user-visible font-gallery sample, terminal-preview sample, and pixel-unit label through stable localization keys using `Strin…
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 19 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (21 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cmux Cloud Persistent Session And Early Input	✅ Passed	PASS: The PR changes macOS Terminal settings, Ghostty option parsing, font preview/gallery UI, localization, and related tests. The authoritative changed-file list contains no Cloud terminal, cmux-tui…
Cmux Swift Actor Isolation	✅ Passed	The production changes do not introduce a matching actor-isolation failure. The new mutable TerminalGhosttyOptionsModel is explicitly @MainActor and is used by TerminalSection and SwiftUI cards …
Cmux Browser Automation Off-Main	✅ Passed	PASS: The PR does not change browser socket automation. The rule’s source files, Sources/TerminalController.swift and `Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Wire/ControlCommandE…
Cmux Expensive Synchronous Load	✅ Passed	The diff does not add or move an agent-history load. TerminalGhosttyOptionsModel.load() is @MainActor, but it runs font enumeration in Task.detached and awaits terminalGhosttyOptions(). The pr…
Cmux Cache Substitution Correctness	✅ Passed	PASS: The PR does not introduce a cache substitution in a history, undo, or snapshot path. TerminalGhosttyOptionsModel reads authoritative Ghostty config through `hostActions.terminalGhosttyOptions(…
Cmux No Hacky Sleeps	✅ Passed	PASS: The pull request changes only Swift source/tests, a localization catalog, and Swift UI Lab files. It introduces no TypeScript, JavaScript, shell, or non-Swift build/runtime changes covered by `r…
Cmux Swift Concurrency	✅ Passed	The diff does not introduce Dispatch queues, DispatchGroup, Combine app state, or completion-handler APIs. The new asynchronous work uses Swift concurrency: SwiftUI .task loads the model, `Task.deta…
Cmux Swift @Concurrent	✅ Passed	PASS. The PR adds no nonisolated async or @concurrent declarations. TerminalGhosttyOptionsModel and TerminalSection are explicitly @MainActor, which is appropriate for UI state. The new font…
Cmux Swift Package Boundaries	✅ Passed	The reviewed production Swift changes are inside existing SwiftPM targets: Ghostty option parsing and value logic are in Packages/macOS/CmuxFoundation/Sources/CmuxFoundation, which exposes the `Cmux…
Cmux Swiftpm Lockfiles	✅ Passed	PASS. The PR changes only Swift source, tests, localization, and UI harness files. It does not change any Package.swift, Package.resolved, .gitignore, workflow, or Xcode project file. The `CmuxF…
Cmux Swift Logging	✅ Passed	The pull request adds no production Swift logging. The authoritative Swift diff contains no print, debugPrint, dump, NSLog, ad hoc file/stdout logging, or Logger declarations. The changed co…
Cmux User-Facing Error Privacy	✅ Passed	PASS. The changed production path reaches users through TerminalSection in Settings > Terminal, but the PR adds no prohibited user-facing error or recovery text. The new picker message is the generi…
Cmux Swiftui State Layout	✅ Passed	The SwiftUI changes use the modern Observation shape: TerminalGhosttyOptionsModel is @Observable and is owned with @State in TerminalSection. The new picker’s LazyVStack rows receive immutab…
Cmux Architecture Rethink	✅ Passed	PASS. The PR creates one @MainActor @Observable TerminalGhosttyOptionsModel in TerminalSection and passes that instance to both cards. This removes the previous duplicate option state and save p…
Cmux Swift Auxiliary Window Close Shortcuts	✅ Passed	The PR does not add or materially change a standalone cmux-owned window. The new production code embeds TerminalFontCard, TerminalFontFamilyPicker, and TerminalFontPreview in the existing `Termi…
Cmux Source Artifacts	✅ Passed	All 20 changed paths are hand-written product source, tests, a localization catalog, or UI Lab harness/shim source. The diff contains no screenshot, recording, log, cache, build output, DerivedData, d…
Cmux No Test Or Debug Seam In Production Source	✅ Passed	PASS. The changed Swift files under production Sources/ add no #if DEBUG or test-build guard, no debug/test seam-named member, and no production accessor that exposes private state only for tests.…
Title check	✅ Passed	The title clearly summarizes the main change: a Terminal settings font card with live preview, font gallery, and line-height controls.
Description check	✅ Passed	The description clearly explains the user problem, resulting behavior, UI details, testing evidence, screenshots, and changelog entry. It omits explicit Testing, Demo Video, and Checklist headings, bu…

Full details: Cmux Swift Blocking Runtime

Explanation

The PR adds Task.sleep(for: Self.writeDelay) at line 66 of the new production TerminalGhosttyOptionsModel.swift. The task runs after every option edit to delay the config write by 250 ms and coalesce changes. The repository rule explicitly fails Task.sleep in production code, including inside async tasks. The changed file is part of the CmuxSettingsUI application target, not a test target. The UI-test polling is test-only and does not cause this failure.

Resolution

Remove the production Task.sleep debounce. Persist the edit immediately, or implement coalescing with an approved cancellation-aware scheduler/timer abstraction or callback whose fire event starts the write. Do not use Task.sleep, delayed dispatch, polling, or another blocking timing primitive.

Full details: Cmux Algorithmic Complexity

Explanation

The PR adds an unbounded font search filter in Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontFamilyPicker.swift:23. Each query update rebuilds filteredFamilies with families.filter, and the computed result is evaluated separately for ForEach at line 41 and the empty-state check at line 44. This gives two O(F) scans per SwiftUI body update and per typed search event, where F is the number of installed monospaced font families. The collection has no explicit size bound, cache, or benchmark. The PR also sorts the unbounded family list on access in TerminalGhosttyOptionsModel.swift:53.

Resolution

Cache the filtered font list for the current trimmed query and reuse that snapshot for both the ForEach and empty-state check. Cache or precompute fontFamilyChoices when the loaded families or current selection changes instead of sorting during view evaluation. If the collection is intentionally bounded, state the bound and attach a measurement showing that the search path meets its UI budget.

Full details: Cmux Full Internationalization

Explanation

The production Swift UI adds localization keys, but the new catalog entries are incomplete. Resources/Localizable.xcstrings already supports 20 locales (ar, bs, da, de, en, es, fr, it, ja, km, ko, nb, pl, pt-BR, ru, th, tr, uk, zh-Hans, zh-Hant); each of the six new keys (settings.terminal.font.builtIn, font.noMatches, font.preview.accessibility, font.search, ghostty.fontThicken, and ghostty.lineHeight) contains only nine locales and is missing bs, da, it, km, nb, pl, pt-BR, ru, th, tr, and uk. The new production font gallery and preview also render user-facing sample text with Text(verbatim:) and hard-coded preview strings in TerminalFontFamilyPicker.swift and TerminalFontPreview.swift, rather than a localized API. The line-height pixel label in TerminalFontCard.swift also appends the user-visible literal " px" directly.

Resolution

Add translated entries for all 20 existing locales to each new key in Resources/Localizable.xcstrings. Route the user-visible font-gallery sample, terminal-preview sample, and pixel-unit label through stable localization keys using String(localized:defaultValue:) or an equivalent API, and add matching translations for every supported locale. Keep only genuine protocol, config, command, or accessibility identifier tokens literal.

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[github-actions]

Dogfood build of b0051020914d4b2c1e9ffcefd52963527c14cd36

cmux DEV pr-15210-b0051020.app

The link opens this exact commit in the cmux dev menu bar app. The build starts on each push and the page waits until it is ready; a newer push replaces it. It signs in against production, so Cloud or backend changes still need a tagged build with a development backend.

Dogfood tours of b0051020

sidebar-and-chrome-tour at b0051020: not run

skipped: CI built this head on a runner pool whose products the UI test Macs cannot load, and media never compiles one; gh workflow run pr-media.yml -f pr=<n> -f allow_compile=true does

_{Tours are picked by the paths globs in dogfood/scenarios/*.json; a Dogfood-tours: a, b line in the description picks them instead (none turns this off). Look at every frame before merging: a green tour only means no step failed.}

[github-actions]

CI failure attribution

CI failed on b005102091 (run 36702410566 attempt 2): 1 unknown.

Job	Verdict	Why
ui-tests	unknown	no known signature; failed step: Wait for the UI test run

Not re-run automatically: ui-tests is not a machine failure.

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Inline comments:
Review comments at @Resources/Localizable.xcstrings:
- Around line 561088-561089: Add translations for all eight newly added
localization keys in the bs, da, it, km, nb, pl, pt-BR, ru, th, tr, and uk
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📒 Files selected for processing (17)

• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyCellHeightAdjustment.swift
• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyTerminalOptionChange.swift
• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyTerminalOptionKey.swift
• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyTerminalOptions.swift
• Packages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/GhosttyTerminalOptionsTests.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Models/NSFont+TerminalFamily.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Models/TerminalGhosttyOptionsModel.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Navigation/CuratedSettingEntry+TerminalGhosttyOptions.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontCard.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontFamilyPicker.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontPreview.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalGhosttyOptionRow.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalGhosttyOptionsCard.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalSection.swift
• Resources/Localizable.xcstrings
• scripts/ui-lab/harnesses/terminal-font-card.swift
• scripts/ui-lab/shims/CmuxFont.swift

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@Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyCellHeightAdjustment.swift:
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representable range; otherwise serialize the Double directly. Add a round-trip
test for a finite percentage outside the Int range.
- Around line 27-34: Update the pixel case in
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📒 Files selected for processing (9)

• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyCellHeightAdjustment.swift
• Packages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/GhosttyTerminalOptionsTests.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontCard.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontFamilyPicker.swift
• Packages/macOS/CmuxSettingsUI/Sources/CmuxSettingsUI/Sections/TerminalFontPreview.swift
• Packages/macOS/CmuxSettingsUI/Tests/CmuxSettingsUITests/SettingsRowAnchorResolutionTests.swift
• Packages/macOS/CmuxSettingsUI/Tests/CmuxSettingsUITests/SettingsSearchIndexTests.swift
• Resources/Localizable.xcstrings
• cmuxUITests/SettingsTerminalBehaviorUITests.swift

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• Resources/Localizable.xcstrings

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Cross-model review (Codex gpt-5.6-sol)

• Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/GhosttyTerminalOptions/GhosttyCellHeightAdjustment.swift:15-19,38-44 — parsing accepts every finite percentage, but configValue converts integral-valued Doubles to Int. A config such as adjust-cell-height = 100000000000000000000% parses successfully, then Settings calls this serializer from TerminalFontCard and traps because the value exceeds Int.max (reproduced on the installed Swift runtime). Bound percentages to Ghostty's supported/safely renderable range, or enter the integer-format branch only after an explicit Int range check and otherwise format the Double; add oversized positive/negative coverage for parsing, serialization, stepping, and the Settings label.

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CI fast guards passes on d1a764220c (https://github.com/manaflow-ai/cmux/actions/runs/36760632118).

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