fix: support the NO_COLOR convention for disabling color by shenxianpeng · Pull Request #552 · commit-check/commit-check · GitHub

Follow-up to #551, which made color TTY-aware but did not answer NO_COLOR — the variable users actually export globally to opt out of color (no-color.org). Before this change, NO_COLOR=1 on a terminal still produced colored output.

Precedence

Environment	Result
FORCE_COLOR=1 (even with NO_COLOR=1, even piped)	color
FORCE_COLOR=0	no color
NO_COLOR=1 (any non-empty value)	no color
otherwise	TTY + TERM detection from #551, unchanged

An explicit force outranks the global opt-out, matching how the wider ecosystem resolves the pair. An empty NO_COLOR counts as unset, per the convention's own wording.

All four rows verified end to end against the built CLI on a real pty, not just unit-tested.

Two test gaps from #551 closed alongside

The reload tests leaked state. importlib.reload(commit_check) recomputed the constants under the test's patched environment, and nothing put them back — the last reload's values persisted for every test that ran afterwards. Nothing breaks today (verified by reordering), but it was a landmine. A restored_module fixture now re-derives the constants on teardown, sequenced so it runs after the environment patches are undone.

Nothing exercised what the print path actually reads. commit_check.util binds its own copies of the constants at import (from commit_check import RED), so reloading commit_check changes commit_check.RED without touching util's copy — the reload tests were asserting on constants the print functions never look at. Two subprocess tests now run the real import path in a fresh interpreter and assert on the printed output itself: FORCE_COLOR=1 must color it, NO_COLOR=1 must not. They are deliberately not benchmark-marked — their cost is the interpreter spawn, not the code under test.

Testing

$ pytest tests/ -q
595 passed

(+5 over main; the one failure, test_load_config_file_permission_error, is the known root-environment flake and reproduces on main.)

Worth landing before v2.13.0

So the first release with color detection follows the convention from day one, rather than shipping an intermediate state that ignores NO_COLOR.

Summary by CodeRabbit

Bug Fixes
- Color output can now be disabled using the standard NO_COLOR environment setting.
- FORCE_COLOR continues to take precedence when explicitly enabled.
- Color decisions are now applied consistently to printed output.

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Review details ⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 563f404e-2780-4e9d-9441-9514796298d0

📥 Commits

Reviewing files that changed from the base of the PR and between ab8f375 and 595a27d.

📒 Files selected for processing (1)

tests/util_test.py

📝 Walkthrough

Walkthrough

The color detection logic now honors non-empty NO_COLOR, preserves earlier FORCE_COLOR precedence, and caches the result used by ANSI constants. Tests cover environment handling, module reloads, and printed output.

Changes

Color support behavior

Layer / File(s)	Summary
Color decision and cached constants commit_check/__init__.py	supports_color() documents and applies NO_COLOR handling. ANSI constants use one cached color decision.
Color behavior validation tests/util_test.py	Tests cover NO_COLOR, empty values, FORCE_COLOR precedence, module restoration, constants, and subprocess output.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to ab8f3

The change correctly targets NO_COLOR precedence, but one subprocess test does not emulate a terminal and may miss a regression in terminal-specific suppression. The PR is mergeable with owner awareness or a follow-up to make that test exercise TTY output.

Possibly related PRs

commit-check/commit-check#551: Directly introduced the related supports_color() behavior and cached ANSI constants.

Suggested reviewers: larsch

🚥 Pre-merge checks | ✅ 5 ✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding support for the NO_COLOR convention to disable color.

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Commit unit tests in branch fix/honor-no-color

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (b446cb8) to head (595a27d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #552   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files          12       12           
  Lines        1348     1351    +3     
=======================================
+ Hits         1323     1326    +3     
  Misses         25       25

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Actionable comments posted: 1

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Inline comments:
In `@tests/util_test.py`:
- Around line 897-913: Update test_no_color_reaches_printed_output so the child
process uses a forwarding stdout stream whose isatty() returns True, and
establish it before importing commit_check.util. Keep capturing the child output
for assertions, then retain the check that NO_COLOR suppresses ANSI escape
sequences.

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Create a new PR with the fixes

ℹ️ Review info ⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 61f5fa2e-e769-4491-95b9-04184594da34

📥 Commits

Reviewing files that changed from the base of the PR and between b446cb8 and ab8f375.

📒 Files selected for processing (2)

commit_check/__init__.py
tests/util_test.py

Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review.

supports_color() from #551 answered FORCE_COLOR, the TTY and TERM, but not NO_COLOR — the variable users actually export globally to opt out of color (https://no-color.org). Any non-empty value now disables color, outranking detection and yielding only to an explicit FORCE_COLOR. Two gaps in the #551 tests are closed alongside. The reload-based tests recomputed the module constants under a patched environment and left the last reload's values in place for every test that ran afterwards; a fixture now re-derives them on teardown. And nothing exercised the copies commit_check.util binds at import — the ones the print functions actually read — so two subprocess tests now run the real import path end to end and assert on what gets printed.

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

Merging this PR will not alter performance

✅ 499 untouched benchmarks
🆕 3 new benchmarks
⏩ 121 skipped benchmarks1

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
🆕	test_force_color_outranks_no_color	N/A	2.8 ms	N/A
🆕	test_no_color_empty_falls_through_to_detection	N/A	2.9 ms	N/A
🆕	test_no_color_turns_color_off_on_a_tty	N/A	2.8 ms	N/A

Comparing fix/honor-no-color (595a27d) with main (b446cb8)

121 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

shenxianpeng requested a review from a team as a code owner August 16, 2026 12:04

github-actions Bot added the bug Something isn't working label Aug 16, 2026

coderabbitai Bot reviewed Aug 16, 2026

View reviewed changes

Comment thread tests/util_test.py Outdated

shenxianpeng force-pushed the fix/honor-no-color branch from ab8f375 to 595a27d Compare August 16, 2026 12:09

shenxianpeng merged commit 3e4b218 into main Aug 16, 2026
28 checks passed

shenxianpeng deleted the fix/honor-no-color branch August 16, 2026 12:18

fix: support the NO_COLOR convention for disabling color by shenxianpeng · Pull Request #552 · commit-check/commit-check · GitHub

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fix: support the NO_COLOR convention for disabling color - #552

fix: support the NO_COLOR convention for disabling color#552
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fix: support the NO_COLOR convention for disabling color by shenxianpeng · Pull Request #552 · commit-check/commit-check · GitHub

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fix: support the NO_COLOR convention for disabling color - #552

fix: support the NO_COLOR convention for disabling color#552shenxianpeng merged 1 commit intomaincommit-check/commit-check:mainfrom fix/honor-no-colorcommit-check/commit-check:fix/honor-no-colorCopy head branch name to clipboard

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shenxianpeng commented Aug 16, 2026 • edited by coderabbitai Bot Loading Uh oh! There was an error while loading. Please reload this page.

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Precedence

Two test gaps from #551 closed alongside

Testing

Worth landing before v2.13.0

Summary by CodeRabbit

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Merging this PR will not alter performance

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fix: support the NO_COLOR convention for disabling color#552
shenxianpeng merged 1 commit into
mainfrom
fix/honor-no-color

shenxianpeng commented Aug 16, 2026 •
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