feat(web): replace xterm.js with ghostty-web

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

Important

Review skipped

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Use the checkbox below for a quick retry:

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---

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❤️ Share

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_{Comment @coderabbitai help to get the list of available commands.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

Important

Review skipped

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⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: 501ceddd-9005-49f5-9097-690d09e7a356

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
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_{Comment @coderabbitai help to get the list of available commands.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

Important

Review skipped

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🧪 Generate unit tests (beta)

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---

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 501ceddd-9005-49f5-9097-690d09e7a356

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
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_{Comment @coderabbitai help to get the list of available commands.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up

[PixPMusic]

Working on #1310.

Swaps the thread terminal drawer from @xterm/xterm to ghostty-web, the libghostty-vt based drop-in mentioned in the issue. The server terminal protocol is a raw byte stream, so the change is contained to the client renderer — no server terminal changes.

Renderer swap

ghostty-web is close to API-compatible with xterm.js, but a few behaviors differ and are adapted here:

• WASM init: terminal creation waits on init(); a session buffer that arrives first is replayed once the terminal mounts.
• Custom key handler semantics are inverted: ghostty-web treats a true return as "consumed, skip terminal input" — the opposite of xterm.js. Without this, all typing is swallowed.
• Link providers: rows/ranges are converted between the app's 1-based link helpers and ghostty-web's 0-based coordinates. The built-in OSC8/URL providers are removed since their activate() calls window.open directly, bypassing the app's preview/editor flow.
• Zero-length write crash: ghostty-web 0.4.0's alloc(0) returns an out-of-bounds pointer, so write("") throws a RangeError deep in WASM. Status-only session updates produced exactly that and took the app down; writes are now guarded. (Worth an upstream report.)
• viewportY semantics are inverted (0 = bottom), so the at-bottom checks used for resize scroll restoration are adapted.
• Scrollbar/selection: ghostty-web renders its own canvas scrollbar and selection; the xterm-specific scrollbar theme keys and CSS import are gone, and @xterm/* dependencies are removed.

Ghostty config passthrough

Since the terminal engine is now Ghostty's, the drawer can match the user's actual Ghostty setup: the server parses ~/.config/ghostty/config (font-family, font-size, theme — including light:/dark: variants, resolved from the user themes dir or the Ghostty.app bundle) into an optional ServerConfig.terminalStyle field. The drawer overlays those colors on the app-derived theme and prepends the configured fonts. Everything is best-effort: no Ghostty config means the previous defaults exactly.

Nerd Font families are appended to the font fallback stack so powerline/devicon glyphs resolve from locally installed patched fonts (Ghostty embeds its own symbols fallback; browser canvas only walks the CSS font list), and the terminal container is painted with the theme background so partial-cell fringes match the canvas during drawer resizing.

I like this approach, but I'll remove it if asked--I could also split it out into a separate PR.

Known limitations

• Runtime theme switching only updates default fg/bg/cursor — cell colors are baked in WASM at write time (ghostty-web limitation).
• Ghostty config changes are picked up on client reload, not watched live.

---

Note

Medium Risk
Large client renderer swap with WASM/CSP changes and new server file reads; terminal I/O protocol unchanged, but regressions in input, links, scrollback, or focus are plausible in a critical UI surface.

Overview
Replaces @xterm/xterm with ghostty-web in the thread terminal drawer. The renderer waits on WASM init and bundled Symbols Nerd Font Mono before mounting; session output that arrives early is replayed once the terminal exists.

Electron CSP adds wasm-unsafe-eval and data: in connect-src for ghostty-web’s WASM and embedded payload.

The drawer adapts ghostty-web vs xterm: inverted custom key-handler semantics, 0-based link row/range conversion, clearing built-in link providers so URLs go through preview/editor, guarding zero-length writes, inverted viewportY for scroll-at-bottom, and writePreservingScrollback so scrolled-back history stays anchored on writes.

Server best-effort reads local Ghostty config (ghosttyStyle.ts) and exposes optional ServerConfig.terminalStyle (fonts, size, light/dark colors). The client overlays that on the app theme and prepends configured font families. Link detection expands to more URI schemes and git+ transport URLs; non-http(s) links open externally.

Focus on style-driven remounts uses shouldFocusTerminalAfterSetup so split views and the composer don’t lose focus.

^{Reviewed by Cursor Bugbot for commit c405032. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Replace xterm.js with ghostty-web in the web terminal

• Swaps the terminal renderer from xterm.js to ghostty-web, initializing a WASM module before terminal creation in ThreadTerminalDrawer.tsx.
• Adds server-side Ghostty config parsing in ghosttyStyle.ts to read fonts, theme colors, and palette entries from the user's local Ghostty config; the result is forwarded to the client via a new terminalStyle field in ServerConfig.
• Bundles Symbols Nerd Font Mono as a WOFF2 fallback font for icon/glyph rendering in the terminal.
• Routes http(s) links through the in-app preview while delegating other schemes (e.g. git+ssh://) to the OS; strips leading git+ transport prefixes before activation.
• Adds wasm-unsafe-eval to script-src and data: to connect-src in the desktop Content Security Policy to support the WASM-based renderer.
• Risk: ghostty-web snaps the viewport to the bottom on every write; a writePreservingScrollback wrapper restores the previous scroll position, but this is new behavior that may surface edge cases.

^{Macroscope summarized c405032.}

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on this repository. Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 501ceddd-9005-49f5-9097-690d09e7a356

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR replaces the terminal emulator library (xterm.js → ghostty-web) and adds new server-side Ghostty config parsing for user terminal theming. The scope includes CSP security policy changes, new contracts, and complex WebAssembly initialization — substantial new functionality warranting human review.

^{You can customize Macroscope's approvability policy. Learn more.}

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit ca084e1. Configure here.}

[juliusmarminge]

#4860. ghosttty-web felt kinda unmaintained and we dont "gained" anything from the added xterm compatibility.

we'll keep the bundled fonts lean and aim to add configurable fonts in a follow up