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l0ng-ai
f5b4a65ec4
An emoji written as base + U+FE0F rendered wrong twice over. Both halves came from the variation selector arriving as a zero-width combining mark after the column budget was already spent. Width, in the `alacritty_terminal` pin (bumped to the fork's b79e704): `input` reserves columns one `char` at a time, so a base whose East Asian Width is Neutral -- U+2764 in `❤️`, U+1F5C2 in `🗂️`, U+26A0 in `⚠️` -- kept the single column it was given, its glyph bled over the next cell, and every column after it on the line shifted left by one. The fork re-scores the sequence with `UnicodeWidthStr`, which is where UTS #51's width-2 rule lives, and widens the cell to match. Presentation, here: `snapshot_cell` copied only `cell.c` into `RenderCell`, so `cell.zerowidth()` was dropped before the shaper ever saw it. `❤` and `❤\u{FE0F}` reached gpui as the same string and picked the same text-presentation face -- a black heart where every other terminal shows a red one. `RenderCell` now carries the marks and a new `RowSeg::Cluster` shapes them with their base. That restores every combining mark, not just the selectors: `e` + U+0301 was being dropped the same way. A marked cell never joins a batched run. Marks add characters without adding columns, which is exactly the correspondence `force_width` uses to pin one glyph per column in a `Run` or `Wide` segment. Fixes #203.
tty7
A terminal workbench: shells, sessions, SSH, coding agents.
Pure Rust · GPU rendering on Zed's gpui · VT core from Alacritty
English · 简体中文
Why
- Fast — ~2× the throughput of Alacritty, Ghostty, or Kitty (benchmarks)
- Sessions persist — quit or reboot; your shells keep running, no tmux
- Editor-grade input — completion, syntax highlighting, history search built in; zero config for zsh, bash, fish, PowerShell
- Agent-aware — recognizes Claude Code & co. in a pane: status, notifications, session resume
Install
Native builds for each platform on Releases:
| macOS | …-macos-arm64.dmg · …-x86_64.dmg |
drag into Applications |
| Windows | …-setup.exe · portable ….zip |
|
| Linux | …-x86_64.AppImage |
chmod +x and run — x11/wayland libs bundled |
What's inside
| Input | ghost suggestions from history · explained tab completion · syntax highlighting · multi-line editing · click places the caret · ⌃ R fuzzy history |
| Window | tabs & splits · ⌘ P palette · ⌘ F scrollback search · eight themes · IME |
| Coding agents | per-pane agent detection (~17 CLIs): status dot, notifications, branch + diff, resume after reboot, tray icon that signals "needs your input" |
| SSH | native russh stack: profiles with keychain secrets, SFTP panel, port forwarding, jump hosts |
Details for every row: docs/features.md. Keybindings: ⌘ , opens Settings — browse and remap everything, tmux preset included (full list).
Benchmarks
Same machine, same day, same 155×40 grid — Apple M1 Pro, macOS 26.3.1, five-run averages (2026-07-04):
| tty7 | Alacritty | Ghostty | Kitty | |
|---|---|---|---|---|
Plaintext IO — 11 MB cat (lower = better) |
95 ms | 239 ms | 179 ms | 185 ms |
| DOOM-fire frame rate (higher = better) | 888 fps | 485 fps | 552 fps | 617 fps |
| Cold-launch memory | 116 MB¹ | 105 MB | 128 MB | 130 MB |
¹ GUI 105 MB + the persistent daemon 11 MB.
Methodology and one-command reproduction: scripts/bench/.
Built on gpui and alacritty_terminal · Apache-2.0 · Discord · Changelog