`/model` with no argument now opens a two-pane modal: model on the left
(deepseek-v4-pro flagship vs deepseek-v4-flash fast-and-cheap, with the
current id appearing as a "current (custom)" row when it isn't one of
the listed defaults), and thinking effort on the right (Off, High,
Max). Tab/←/→ swaps panes, ↑/↓ moves within the focused pane, Enter
applies both, Esc cancels.
Effort exposes only the three rows DeepSeek behaviorally distinguishes
per the Thinking Mode docs — `low`/`medium` are mapped server-side to
`high`, and `xhigh` to `max`, so listing them as separate choices would
mislead. The legacy variants stay valid in `~/.deepseek/settings.toml`
for back-compat (the existing `cycle_next` already only visits
Off→High→Max), the picker just doesn't surface them.
Apply path:
* mutates app.model and app.reasoning_effort
* resets last_*_tokens / cache / replay-token gauges so the next-turn
footer numbers reflect the new model rather than stale ones
* persists `default_model` and `reasoning_effort` to settings via the
existing Settings::set/save flow so the choice survives restart
* forwards Op::SetModel + Op::SetCompaction to the engine so the
running session picks up the new compaction budget
* surfaces a one-line summary describing what changed
* if persistence fails, the in-memory change still applies and a
"(not persisted: ...)" suffix is appended to the status line
`/model <id>` keeps working unchanged for power users; only the
no-argument branch was redirected to the new modal.
Files:
* tui/model_picker.rs — new ModelPickerView struct + ModalView impl,
plus eight unit tests (initial state, low/medium normalisation,
custom model preservation, arrow navigation, focus toggle, Enter
emits ModelPickerApplied with the right values, Esc closes silently,
and a guard that the picker exposes exactly off/high/max).
* tui/views/mod.rs — adds ModalKind::ModelPicker and
ViewEvent::ModelPickerApplied carrying both new and previous
model+effort so the handler can describe the diff.
* tui/app.rs — adds AppAction::OpenModelPicker.
* commands/core.rs — `/model` no-arg branch now returns
AppAction::OpenModelPicker; `/model <id>` shortcut is unchanged.
* tui/ui.rs — pushes ModelPickerView on the action and adds
apply_model_picker_choice() that handles persistence + engine sync
when ViewEvent::ModelPickerApplied fires.
* tui/mod.rs — registers the new submodule.
Closes#39 (against v0.5.2).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Hunter Bown
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