feat(expose): render agent previews in their real colors

[TraderSamwise]

Summary

Exposé tiles previously rendered all captured agent output in a uniform dim grey because the capture stripped every escape sequence. This makes the previews show the agents' real colors.

Changes (src/tmux/expose.ts)

• Capture with color — pass includeEscapes: true to captureTarget so tmux emits SGR via -e.
• Color-preserving sanitizer — sanitizeLine now keeps SGR sequences (\x1b[…m) and strips everything else dangerous (non-SGR CSI/cursor moves, OSC, stray escapes, control bytes). Security posture is unchanged: a rogue pane still can't inject cursor moves or break tile borders.
• ANSI-aware tile body — body lines truncate via truncateAnsi and pad by visible width via stripAnsi, so colored lines don't bleed into borders. Removed the old uniform-grey BODY_STYLE.

Covers both per-project Exposé (Ctrl-A g) and cross-project Exposé from the meta dashboard, since they share tilePreview/drawTile.

Verification

yarn typecheck, yarn lint, yarn test (1180 passed), yarn build all green.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved tmux preview rendering to preserve color and text styling while maintaining safe, properly-aligned display.
  • Fixed text truncation and padding calculation in previews for accurate content visualization.

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Project	Deployment	Actions	Updated (UTC)
app	Ready	Preview, Comment	Jun 15, 2026 7:43am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 25f1684e-ec71-408e-a579-7e8939d30c86

📥 Commits

Reviewing files that changed from the base of the PR and between 780dd66 and c129a86.

📒 Files selected for processing (2)

• src/tmux/expose.ts
• src/tui/render/text.ts

📝 Walkthrough

Walkthrough

src/tmux/expose.ts is updated to preserve SGR color/style escape sequences in tile previews. sanitizeLine now retains only ESC[...m sequences while stripping other control bytes. Preview rendering switches to truncateAnsi with visible-length padding via stripAnsi. Tmux capture calls now pass includeEscapes: true.

Changes

ANSI Color Preservation in Tile Previews

Layer / File(s)	Summary
SGR-preserving sanitizeLine and ANSI-aware preview rendering src/tmux/expose.ts	Adds stripAnsi import; rewrites sanitizeLine to keep only SGR m sequences and strip all other escape/control sequences; updates tile preview line rendering to use truncateAnsi for truncation and stripAnsi for visible-length right-padding.
Enable includeEscapes in tmux capture src/tmux/expose.ts	Changes the tmux capture call for each target window to pass includeEscapes: true, supplying raw SGR sequences to the updated sanitizer and renderer.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• TraderSamwise/aimux#118: Both PRs modify ANSI truncation and padding behavior in preview rendering to correctly handle SGR escape/reset sequences at padding boundaries.
• TraderSamwise/aimux#122: Introduced the Exposé tile/capture preview UI in src/tmux/expose.ts that this PR refines with SGR-preserving sanitization and ANSI-aware rendering.

Poem

🐇 A rabbit peeked at colors bright,
Escaped sequences hidden from sight.
"Keep the m!" the bunny said,
Strip the rest, but spare the red.
Now tiles glow with ANSI flair,
Padded right — with visible care! 🎨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(expose): render agent previews in their real colors' directly and clearly summarizes the main change: displaying agent previews with original colors instead of uniform styling.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/expose-color

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/tmux/expose.ts`:
- Around line 44-53: The regex patterns in the `stripAnsi` and `truncateAnsi`
functions use `[0-9;]*` for ANSI parameter bytes, but `sanitizeLine` uses
`[0-9;:?]*` to preserve colon-separated SGR sequences like `\x1b[38:2:255:0:0m`,
causing a mismatch that leads to incorrect sequence counting during truncation
and padding. Update the regex patterns in `stripAnsi` and `truncateAnsi` to
include `:` and `?` in the parameter byte character class (changing `[0-9;]*` to
`[0-9;:?]*`) to align with the `sanitizeLine` implementation and correctly
handle all valid SGR syntax.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 06887b5f-6064-47f3-86e9-9621569218de

📥 Commits

Reviewing files that changed from the base of the PR and between e549358 and 780dd66.

📒 Files selected for processing (1)

• src/tmux/expose.ts

[TraderSamwise]

Sub-agent review — additional findings (handled in c129a86)

Two issues beyond the CodeRabbit thread, both fixed:

1. sanitizeLine keep-predicate too loose (src/tmux/expose.ts) — the old predicate m.endsWith("m") retained any matched CSI ending in m, including non-SGR forms with ? params or intermediate bytes. Tightened to /^\x1b\[[0-9;:]*m$/, so only pure SGR color/style sequences survive; everything else is stripped.

2. Truncated CSI at the capture boundary (src/tmux/expose.ts) — a pane capture can cut a color sequence mid-write, leaving a trailing \x1b[… with no final byte that none of the existing passes removed. Added a \x1b\[[0-9;:?]*[ -/]*$ pass to strip a trailing incomplete CSI. (Note: the sub-agent's suggested blanket \x1b strip was rejected — it would have destroyed the ESC inside the SGR sequences we intentionally keep.)

yarn typecheck, yarn lint, yarn test (1226 passed), yarn build all green.