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feat: use installed wheels offline, quieter clang-tidy output, repair split --checks - #302
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… split --checks - Use a clang-format/clang-tidy wheel that is already installed in the hook environment (e.g. from additional_dependencies) when it matches --version, or when no --version is given, without contacting PyPI. The hook now works offline and on pre-commit.ci, and an unpinned run no longer upgrades the installed wheel. - Pass -quiet to clang-tidy and drop status lines such as "522 warnings generated." and "[1/2] Processing file ..." unless --verbose is given. - Join --checks/--warnings-as-errors lists that YAML split at the commas, remove quotes inside the value, and explain that --checks=.clang-tidy has no effect. The notes are added to the hook output.
On macOS without a compilation database, clang-tidy cannot find stdio.h, so testing/main.c always reports "Error while processing".
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WalkthroughThe changes add matching installed-wheel reuse before PyPI resolution. They also update clang-tidy argument repair, quiet-mode behavior, status-line filtering, configuration notes, tests, and documentation. Changesclang-tidy argument and output handling
Installed-wheel version resolution
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
Docstring coverage is 40.35% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 4 files. (5 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly summarizes all three primary changes: offline reuse of installed wheels, quieter clang-tidy output, and repair of split --checks arguments. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 40.35% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 4 files. (5 skipped: 5 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @cpp_linter_hooks/util.py:
- Line 218: Update the clang-tidy execution flow in the serial and parallel
invocation paths to use the executable path returned by the resolver instead of
the bare “clang-tidy” name. Preserve the resolved-path behavior when reusing the
installed wheel, including environments where PATH ordering differs or the
scripts directory is absent.
- Line 218: Update run_clang_format to use the executable path returned by
_find_installed_wheel when constructing the subprocess command, rather than
resolving clang-format by name; preserve the existing behavior for cases where
no wheel path is found.
- Line 177: Update the executable resolution around shutil.which in the tool
resolver so a process-PATH fallback is not accepted solely with the wheel
metadata version. Verify the fallback executable’s actual version against the
requested version before assigning it that version; otherwise return None or
continue through normal resolution, while preserving reuse of the
wheel-installed executable when it is verified in the scripts directory.
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📒 Files selected for processing: 10
AGENTS.mdREADME.mdcpp_linter_hooks/clang_tidy.pycpp_linter_hooks/util.pytesting/pre-commit-config-parallel.yamltesting/pre-commit-config-style.yamltesting/pre-commit-config-version.yamltesting/pre-commit-config.yamltests/test_clang_tidy.pytests/test_util.py
💤 Files with no reviewable changes: 1
- testing/pre-commit-config.yaml
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- Accept an installed wheel only when its executable is in this environment's scripts directory; a tool elsewhere on PATH can be a different version. - After pip installs a wheel, prefer the executable in the scripts directory. - Both hooks run the resolved executable path instead of the bare name.
Merging this PR will improve performance by 37.15%2 warnings
Performance Changes
Tip Curious why performance improved? Comment Comparing 
Footnotes
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importlib.metadata.version() parses the wheel's whole METADATA file, which CodSpeed counted as a large regression on every hook run. Listing site-packages for <name>-<version>.dist-info is about ten times cheaper, and the environment paths are looked up once per process.
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #302 +/- ##
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Coverage 100.00% 100.00%
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Files 3 3
Lines 248 347 +99
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+ Hits 248 347 +99 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Three small fixes found while measuring how the clang-tidy hook behaves in real configurations.
1. Use the installed wheel, work offline
Before, every run asked pypi.org which version to use:
--versionset and no network, the hook failed even when the right wheel was already installed (pre-commit.ci runs hooks without network access).--version, each run installed the newest wheel. A run in an environment that hadclang-tidy==21.1.6fromadditional_dependenciesupgraded it to 23.1.3.Now the hook first looks for a wheel already installed in the hook environment. It finds the version from the
<name>-<version>.dist-infodirectory in site-packages, and it needs the wheel's executable in that environment's scripts directory. It uses that wheel without contacting PyPI when it matches--version(exact or prefix), or when no--versionis given. Otherwise nothing changes: the version is resolved on PyPI and installed.Both hooks now run the executable they resolved, instead of whatever
clang-formatorclang-tidycomes first onPATH.The README gets an "Offline and pre-commit.ci" section that installs the tool through
additional_dependencies.Behavior changes:
--version, the hook keeps the wheel it installed on the first run until pre-commit rebuilds the environment, for example after arevoradditional_dependencieschange, or afterpre-commit clean.--version=21keeps an installed 21.x wheel instead of moving to a newer 21.x patch.2. Quieter clang-tidy output
Unless
--verboseis given, the hook now does two things:-quietto clang-tidy, unless the user already set-quietor--quiet.N warnings generated.(clang-tidy 18 and older print it even with-quiet)Suppressed N warnings (...)Use -header-filter=...[1/N] Processing file ...Diagnostics,
Error while processing ...and the compile database messages stay. With--verbose, the output is unchanged.3. Repair the old README patterns
In a sample of 24 public configurations that use this clang-tidy hook, 13 still carry patterns from the README before #285:
[...]. YAML splits[--checks=-*,bugprone-*]at the commas. clang-tidy then treatsbugprone-*as a source file and fails on every commit withno such file or directory. The hook now joins the pieces again, for both--checks=and--warnings-as-errors=, and adds a note with the quoted form.--checks="boost-*", the quotes reach clang-tidy as part of the glob, so the glob matches nothing. The hook removes them and adds a note. Those checks now actually run, so affected users may see new warnings.--checks.--checks=.clang-tidy(and the.clang-ditytypo) has no effect, since clang-tidy reads.clang-tidyby itself. The hook leaves the option in place and adds a note.The notes are appended to the hook output, which pre-commit shows when the hook fails.
testing/*.yamlused--checks=.clang-tidytoo, so it is removed there.Tests
uv run pytest: 278 passed (211 before), with new unit tests for all three parts and one end-to-end test that runs the real tool with a split--checks.bash testing/run.sh: 5 passed, 0 failed.unshare -n, under both pre-commit and prek, using--version=21,additional_dependencies: [clang-format==21.1.8]/[clang-tidy==21.1.6], and an unquoted--checks=-*,readability-braces-around-statements:main(20a6884)Could not find any stable versions of clang-format on PyPICould not find any stable versions of clang-tidy on PyPIreadability-braces-around-statementswarning, plus a note about the split--checks