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feat(coding-agent): add FooterDataProvider for git branch and extension statuses

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Expose data that extensions cannot otherwise access: git branch and
extension statuses from setStatus(). Token stats, model info, etc.
remain computable via ctx.sessionManager and ctx.model.
This commit is contained in:
Nico Bailon 2026-01-08 23:52:34 -08:00
parent b4351040a7
commit 7b902612e9
8 changed files with 227 additions and 230 deletions
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21
packages/coding-agent/docs/tui.md
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@ -624,23 +624,24 @@ ctx.ui.setWidget("my-widget", undefined);
### Pattern 6: Custom Footer
Replace the entire footer with custom content.
Replace the footer. `footerData` exposes data not otherwise accessible to extensions.
```typescript
ctx.ui.setFooter((_tui, theme) => ({
render(width: number): string[] {
const left = theme.fg("dim", "custom footer");
const right = theme.fg("accent", "status");
const padding = " ".repeat(Math.max(1, width - visibleWidth(left) - visibleWidth(right)));
return [truncateToWidth(left + padding + right, width)];
},
ctx.ui.setFooter((tui, theme, footerData) => ({
invalidate() {},
render(width: number): string[] {
// footerData.getGitBranch(): string | null
// footerData.getExtensionStatuses(): ReadonlyMap<string, string>
return [`${ctx.model?.id} (${footerData.getGitBranch() || "no git"})`];
},
dispose: footerData.onBranchChange(() => tui.requestRender()), // reactive
}));
// Restore default
ctx.ui.setFooter(undefined);
ctx.ui.setFooter(undefined); // restore default
```
Token stats available via `ctx.sessionManager.getBranch()` and `ctx.model`.
**Examples:** [custom-footer.ts](../examples/extensions/custom-footer.ts)
### Pattern 7: Custom Editor (vim mode, etc.)