mirror of
https://github.com/l0ng-ai/tty7.git
synced 2026-09-22 00:02:23 +00:00
webdev
010457132f
A flag such as 🇨🇳 is two Regional Indicator symbols, U+1F1E8 U+1F1F3.
Each is width 1 to unicode-width, so the grid gives each its own column
and no spacer: the pair already sits in exactly the two columns a flag
occupies. But `segment_row` sent each one to `Solo`, and a `Solo` is its
own `shape_line` call. The shaper never saw the two together, so it had
no chance to form the flag ligature, and each half came out as the
letter-in-a-box glyph an emoji face draws for a lone indicator. A `Solo`
also clips to two cells so a fallback face's advance has room, and that
box is two cells wide, so each half spilled into the next column as well.
Join a Regional Indicator and the one after it into a single two-cell
`Cluster`, the move a7835a0 made for SARA AM: two width-1 codepoints
that own a column each but are not atomic to the shaper. The check sits
ahead of the marks branch so a stray mark on either half (a VS16 on the
first, say) rides along in the cluster text instead of splitting the
pair — split, the other half paints alone as a box again.
`wide_base` stays false. With the ligature there is one glyph at
position zero and the pinning is moot. Without it — a font that lacks
the flag — the shaper returns two glyphs, and `force_width = cell_width`
pins the second into the second column, where it stays visible — the
two legible halves such a setup shows today. `wide_base: true` would
pin it at `2 × cell_width`, past the cluster's two-cell clip, and
swallow half the pair.
The edges fall out of the scan. An indicator in the last column has no
partner on its row and stays `Solo`; two halves of a flag on different
rows cannot be joined, and drawing them apart is the honest answer.
Three in a row pair greedily left to right, which is UAX #29's rule for
them. A style change between the halves keeps the cluster under the
first cell's style, as for SARA AM: a recoloured flag beats two boxes.
Selection, copy, cursor placement and reflow read the alacritty grid,
not `RowSeg`, and are untouched.
A grid-level test feeds 🇨🇳x through the emulator, `snapshot_cell` and
`segment_row`, pinning the premise that each indicator lands in one
plain column. A unicode-width or alacritty bump that changes that fails
there rather than misdrawing quietly.
Out of scope: skin-tone modifiers and ZWJ sequences. Those are a
grid-width problem — alacritty reserves four or six columns for them —
and nothing here touches them.
tty7
A terminal workbench: persistent sessions, remote work, agents.
Pure Rust · GPU rendering on Zed's gpui · VT core from Alacritty
English · 简体中文
Why
- Performance — ~2× the throughput of Alacritty, Ghostty, or Kitty (benchmarks)
- Persistent sessions — quit or reboot; your shells and supported agent sessions keep running, no tmux
- Editor-grade input — suggestions, completion, highlighting, history search
- Remote development — files, repos, panes, and git data stay on the remote machine
- Native SSH — profiles, SFTP, port forwarding, and jump hosts
- Agent-aware — Claude Code, Codex & co.: status, notifications, git context
- CLI + Skills — agents create panes, run commands, and inspect output
Install
Native builds for macOS, Windows, and Linux 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 libraries bundled |
What's inside
| Editor-grade 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 · nine themes · IME |
| Agent-aware | per-pane detection (18 CLIs): status dot · notifications · branch + diff · resume after reboot · tray icon when input is needed |
| Remote workspaces | remote files, repos, changes, diffs, worktrees, tabs, and panes · reconnect from any client and continue where you left off |
| CLI + Skills | bundled tty7 CLI · agent skill · pane/workspace control · real PTY commands · output, process, port, and agent status |
| SSH | native russh stack: profiles with keychain secrets · SFTP panel · port forwarding · jump hosts · one-time, unprivileged tty7-server install |
Full documentation lives in docs/ —
keyboard shortcuts ·
config.json ·
CLI reference. The agent-facing CLI interface is also
documented in skills/tty7/SKILL.md.
Install the skill with:
npx skills add l0ng-ai/tty7 # install
npx skills update tty7 # update later
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 I/O — 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 server 11 MB.
Methodology and one-command reproduction: scripts/bench/.
Built on gpui and alacritty_terminal · Apache-2.0 · Discord · Changelog