Scan hidden files by default, never walk .git - #16
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The README's "what gets scanned" section has always promised "everything git would track", but the walker skipped hidden entries unless --hidden was passed. Git tracks .github/workflows, so a tag on a pinned action version or a step commented out until a fix lands was silently never checked. That is the failure this tool exists to prevent. The hidden-by-default rule came from ripgrep, whose walker this uses, but ripgrep is an interactive search tool where dotdirs are noise. This is a CI gate over tracked content, and .gitignore already expresses exactly that filter. .git is now excluded unconditionally instead. It held 97% of the files a --hidden scan read, and .git/COMMIT_EDITMSG and .git/logs hold commit messages, so a commit that merely discussed a tag was reported as one. The match is on the entry name, so a submodule's or nested checkout's .git goes too, as does the .git file a worktree gets in place of a directory. Roots named on the command line are exempt, since the walker never applies the filter at depth 0, which keeps the existing promise that a file named explicitly is always scanned. --hidden now asks for what always happens. It stays accepted and stays silent so an existing CI invocation keeps working, and it leaves --help because there is nothing left to choose. Both walks are built by one function now. --files exists to answer "what will be scanned", so the two had to stop being separate builders that a filter could be added to one of. Closes #15
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📝 WalkthroughWalkthroughThe scanner includes hidden files and directories by default. It excludes ChangesScanning behavior
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR changes scanning defaults but currently warns on the still-supported --hidden option, which can disrupt existing CI expectations, and the changelog does not yet confirm the required minor release version. This is a bounded low-risk follow-up or owner-acceptance item. Sequence Diagram(s)sequenceDiagram
participant CLI
participant Walker
participant Scanner
participant stderr
CLI->>Walker: build shared metadata-aware walker
Walker-->>Scanner: hidden files excluding metadata paths
Scanner-->>CLI: findings
CLI->>stderr: print deduplicated --hidden notice before findings
🚥 Pre-merge checks | ✅ 2 | ❌ 3❌ Failed checks (3 warnings)
✅ Passed checks (2 passed)
Full details: Linked Issues checkExplanation The PR implements the main scanning changes from issue Full details: Out of Scope Changes checkExplanation The deprecation-notice mechanism adds behavior outside issue Full details: Docstring CoverageExplanation Docstring coverage is 77.78% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 1 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Bencher Report| Project | todo-by |
| Branch | fix/scan-hidden-skip-git |
| Testbed | ubuntu-latest |
Click to view all benchmark results
| Benchmark | Latency | Benchmark Result milliseconds (ms) (Result Δ%) | Upper Boundary milliseconds (ms) (Limit %) |
|---|---|---|---|
| scan angular/angular | 📈 view plot 🚷 view threshold | 130.88 ms(+7.26%)Baseline: 122.02 ms | 152.53 ms (85.81%) |
The flag is kept only so an existing CI invocation keeps working. A version trigger is what stops that from becoming permanent: it fires the moment the project reaches v1.0, which is the first release where dropping an accepted flag is not a surprise. Dogfoods the version trigger on this repository's own scan.
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Inline comments:
In `@src/main.rs`:
- Around line 588-592: Filter any scan root whose final path component is .git
before passing it to ignore::WalkBuilder::new or WalkBuilder::add, since
filter_entry does not protect depth-0 roots. Preserve filtering for nested .git
paths and add direct-root coverage for both scan and --files behavior.
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Review follow-up. `ignore` applies `filter_entry` only from depth 1 down, so the .git exclusion covered directories the walk discovered but not one named as an argument: `todo-by . .git` still read 958 files of repository metadata, and with them the phantom findings that come out of .git/COMMIT_EDITMSG and .git/logs. Roots are now filtered separately, on the resolved path, so running from inside .git is caught as well as naming it. The walker tests were passing against mutants they should have caught. Dropping the overrides, dropping every root past the first, and flipping require_git all left the suite green: the two new tests each used one root, passed no overrides, and ran against a fixture with a real .git that made require_git irrelevant. Each of those is now pinned, along with the empty-root guard and the absence of --hidden from --help. The parity test also earned its name: it compared findings against a hardcoded path, so the two walks could diverge on any file without a tag and nothing would notice. Every fixture file carries a tag now and the assertion is set equality against the file list. Docs: the walker doc comment no longer restates what the README owns, and no longer claims --files reports exactly what the scan reads, since the scan drops binary files after the walk yields them. The changelog no longer calls .gitignore the only filter, which ignored .ignore files, global excludes and the exclude config key.
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In `@CHANGELOG.md`:
- Around line 12-17: Update the package version declaration in Cargo.toml from
0.4.0 to 0.5.0, and add a 0.5.0 heading and corresponding comparison link in
CHANGELOG.md for the documented changes.
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Scanning hidden entries by default exposed the same defect #15 reported for .git, in the layouts git is not the only one to have. Verified on a fixture holding one real tag: the scan reported four findings. .hg stores the last commit message verbatim, so it produces the phantom the .git fix was for, and .svn/pristine and .jj/repo/store hold whole copies of tracked files, so every real finding came back a second time at a path nobody can edit. None of these are covered by .gitignore in an hg or svn checkout, and the ignore crate does not skip them on its own; it looks for .git only to locate a repository root. Until this change they were skipped for being hidden, which is the protection this branch removed. The four names now sit in one list used by both the entry filter and the root filter, so the two cannot drift. Tests: the fixture carries a tag in every file the walk must not reach, so a leak names itself rather than moving a count, and it grew a hidden gitignored file, since being hidden and being ignored stopped being the same thing. New cases cover each metadata directory named as a root, a symlink pointing into one (the only test that fails if the root filter stops resolving the path first), and a gitignored file named directly, which must still be scanned. Docs: the README sentence about explicitly named files was over-promising now that metadata paths are exempt from it, and the 97% figure is stated as the repository-specific measurement it is.
--hidden was accepted and inert, with removal scheduled for 1.0 by a version tag on the arm itself. That plan was silent until the day it breaks: the first signal a user ever got would be an unknown-option error in the 1.0 upgrade. Parsing a retired flag now records a notice, and main prints the notices once, on stderr, before anything that can fail or find something. stderr rather than stdout so a notice never lands in --files output or a JSON stream, and before the scan so it is not buried under findings. Repeats of the same flag collapse into one line, and a run that passes no retired flag prints nothing. The mechanism is a list rather than a single case because more flags are expected to retire before 1.0; the next one is a `deprecate` call and a sentence saying what it does now and when it goes.
`todo-by .git/hooks` printed nothing and exited 0, which is exactly what a clean scan looks like, so a path that could not be scanned was indistinguishable from a path with nothing in it. The check fifteen lines above already speaks up about a path that does not exist; this one stayed quiet about a path it refused. .git/hooks is the case that makes it matter: the scripts there are written by the user, and 0.4.0 with --hidden did scan them. The notice only describes the decision. Whether a root is walked stays `walk_builder`'s call, so the two cannot disagree about what was skipped. Exit code is unchanged: refusing to read repository metadata is not an error, it is the guarantee.
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Inline comments:
In `@src/main.rs`:
- Around line 181-185: Update the argument handling for "--hidden" in the CLI
parser to accept it as a silent no-op: remove the deprecate call and any routine
stderr warning while preserving compatibility acceptance. Update the
corresponding CHANGELOG entry to describe the silent behavior.
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Context
Closes #15.
todo-bydocuments what it scans as "everything git would track", but the walker skipped hidden entries unless--hiddenwas passed. Git tracks.github/workflows, so a tag on a pinned action version, or on a step commented out until a fix lands, was silently never checked. A tag that is never checked is the exact failure this tool exists to prevent.Passing
--hiddentraded that for a worse problem: the walk then descended into.git, which on a real repository was 97% of the files read..git/COMMIT_EDITMSGand.git/logshold commit messages, and a commit message discussing atodo-bytag reads to the scanner exactly like the tag itself, so the flag produced phantom findings. Scanning hidden entries by default turns that into the default for every other VCS layout too:.hgstores the last commit message, and.svn/pristineand.jj/repo/storestore whole copies of tracked files, so a tree with one tag reported four findings.Solution
Hidden files are walked unconditionally, so the ignore files and the
excludeconfig key decide alone, which is what the docs already claimed..git,.hg,.svnand.jjare excluded unconditionally in exchange, by entry name rather than by path, so a submodule's or nested checkout's metadata is skipped too, as is the.gitfile a worktree gets in place of a directory.The exclusion rides on
ignore'sfilter_entry, which the crate does not apply at depth 0, so roots are filtered separately and on the resolved path:todo-by .git,todo-by . .gitand running from inside.gitall miss it. Roots are the only place the walker would otherwise honor a path blindly, and that is exactly the promise about explicitly named files, which still holds for everything outside those four directories.--hiddennow asks for what always happens. It is still accepted and still silent, so a CI job already passing it keeps working, and it is gone from--helpbecause there is nothing left to choose.scan_rootsandlist_file_pathswere two copies of the same builder. They share one now:--filesexists to answer "what will be scanned", and a filter added to one copy but not the other makes that answer a lie. The tests assert set equality between the two walks over a fixture where every file carries a tag, so a leak from a metadata directory names itself instead of moving a count. Each walker setting is pinned by a case that fails when it is reverted, which is how three surviving mutants in the first round of these tests were found.This warrants a minor bump rather than a patch. Repositories that keep tags in dotfiles or
.github/will see findings they did not see before, which is the point, but it is new behavior arriving in a scan people gate CI on. The changelog entries sit under[Unreleased].Summary by CodeRabbit
.git,.hg,.svn, and.jjmetadata directories, including nested checkouts and worktrees.--hiddenoption.--hiddenoption remains accepted temporarily and now displays a notice that it will be removed in version 1.0.