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fix(tui): improve color contrast for light-background terminals (#40345)

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* fix(tui): improve colour contrast for light-background terminals (#38636)

Detect light terminal backgrounds via COLORFGBG and apply a WCAG
AA-compliant light palette. Adds OPENCLAW_THEME=light|dark env var
override for terminals without auto-detection.

Uses proper sRGB linearisation and WCAG 2.1 contrast ratios to pick
whichever text palette (dark or light) has higher contrast against
the detected background colour.

Co-authored-by: ademczuk <ademczuk@users.noreply.github.com>

* Update CHANGELOG.md

---------

Co-authored-by: ademczuk <andrew.demczuk@gmail.com>
Co-authored-by: ademczuk <ademczuk@users.noreply.github.com>
This commit is contained in:
Vincent Koc
2026-03-08 16:17:28 -07:00
committed by GitHub
parent 211f68f8ad
commit a3dc4b5a57
6 changed files with 381 additions and 5 deletions
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6
docs/help/environment.md
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@@ -68,6 +68,12 @@ OpenClaw also injects context markers into spawned child processes:
These are runtime markers (not required user config). They can be used in shell/profile logic
to apply context-specific rules.
## UI env vars
- `OPENCLAW_THEME=light`: force the light TUI palette when your terminal has a light background.
- `OPENCLAW_THEME=dark`: force the dark TUI palette.
- `COLORFGBG`: if your terminal exports it, OpenClaw uses the background color hint to auto-pick the TUI palette.
## Env var substitution in config
You can reference env vars directly in config string values using `${VAR_NAME}` syntax: