fix: support the NO_COLOR convention for disabling color - #552
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Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to 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
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #552 +/- ##
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Coverage 98.14% 98.14%
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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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- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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commit_check/__init__.pytests/util_test.py
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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.
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Merging this PR will not alter performance
Performance Changes
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Footnotes
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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=1on a terminal still produced colored output.Precedence
FORCE_COLOR=1(even withNO_COLOR=1, even piped)FORCE_COLOR=0NO_COLOR=1(any non-empty value)TERMdetection from #551, unchangedAn explicit force outranks the global opt-out, matching how the wider ecosystem resolves the pair. An empty
NO_COLORcounts 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. Arestored_modulefixture 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.utilbinds its own copies of the constants at import (from commit_check import RED), so reloadingcommit_checkchangescommit_check.REDwithout touchingutil'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=1must color it,NO_COLOR=1must not. They are deliberately not benchmark-marked — their cost is the interpreter spawn, not the code under test.Testing
(+5 over main; the one failure,
test_load_config_file_permission_error, is the known root-environment flake and reproduces onmain.)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
NO_COLORenvironment setting.FORCE_COLORcontinues to take precedence when explicitly enabled.