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Add modal editing to the agent TUI. (#2)

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Adds a status line indicating which mode the user is in.
Adds a "normal" mode with keyboard shortcuts (including a chorded shortcut 'gg').
Adds a command mode with several basic commands that can be entered into an overlay.

Chores:
- Cleans up design/claude/plan.md to avoid confusing claude.
- Adds some TODOs based on claude feedback.`

Reviewed-on: #2
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>
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Drew 2026-02-25 01:16:16 +00:00 • committed by Drew
parent 5d213b43d3
commit 3fd448d431
9 changed files with 725 additions and 101 deletions
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4
TODO.md
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@ -2,3 +2,7 @@
- Move keyboard/event reads in the TUI to a separate thread or async/io loop
- Keep UI and orchestrator in sync (i.e. messages display out of order if you queue up many.)
- `update_scroll` auto-follows in Insert mode, yanking viewport to bottom on mode switch. Only auto-follow when new content arrives (in `drain_ui_events`), not every frame.
- `G` sets scroll to `u16::MAX` and relies on `update_scroll` clamping. Compute actual max_scroll inline, or document the contract that `update_scroll` must always run before render.
- `:clear` clears TUI state immediately but sends `ClearHistory` to orchestrator async. A mid-stream response can ghost back in after clear. Need synchronization (e.g. clear on `TurnComplete`, or have orchestrator ack the clear).
- Command overlay width: `(out.width / 2).max(80)` makes overlay full-bleed on 80-col terminals. Consider `.max(40)` or a different minimum.