feat: nested gitignore, extend-select, per-file-ignores, caching - #23
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Previously only the root .gitignore was honored during file discovery, so nested .gitignore files in subdirectories (e.g. vendored/generated code) were silently ignored, causing house-lint to scan files git itself would skip. Nested .gitignore patterns are now combined with the root .gitignore into a single root-anchored spec per directory, in root-to-leaf order, so GitIgnoreSpec's own last-matching-line-wins semantics reproduce git's actual precedence rules -- including a closer .gitignore's negation overriding a farther one's ignore. Directory names containing gitignore metacharacters (e.g. "sub[1]", "!important") are escaped before being embedded into the combined pattern, so they're matched as literal path segments rather than reinterpreted as pattern syntax. --no-gitignore continues to disable gitignore handling at every level. Closes #13
…tion CLI --select previously replaced the configured select list wholesale, so passing --select for one extra rule dropped every other configured rule. extend-select/extend-ignore -- in both TOML config and as CLI flags -- now layer additively on top of the base selection (configured select/ignore, or a --select override) regardless of its source. CLI --ignore still always wins as the final override. Also documents nested .gitignore support (shipped in the prior commit) in README.md and docs/configuration.md, which still described the old root-only behavior. Closes #14
[tool.house-lint.per-file-ignores] maps root-relative Git-ignore-style glob patterns to rule IDs to drop for matching files, without changing the global selection for everything else (e.g. silencing HSL002 for tests/** without disabling it project-wide). The dropped rule's detector never runs for a matching file -- it isn't just filtered from the findings afterward -- so a stale suppression pragma naming that rule in a per-file-ignored file is correctly flagged as an unused suppression via HSL900, the same as suppressing an already-disabled rule. HSL900 can never appear in a per-file-ignores value, matching the existing select/ignore/extend-select/extend-ignore constraint. Closes #15
check now caches each file's result under <root>/.house-lint-cache/<house-lint version>/ (gitignored by default), keyed by the file's content hash and its effective per-file config hash (resolved rule set plus HSL101/HSL102/HSL103 options). A cache hit skips tokenization, parsing, and rule execution entirely for that file; an upgrade to a new house-lint version starts from an empty cache automatically, since the version is part of the cache path. Cache entries are addressed by (content hash, config hash) rather than by file path, so two files with identical content and effective config can share an entry -- cached findings/errors are stored without their path field and re-attached to the actual file's path on read. Because HSL101's "filenames" scope makes output depend on the file's name (not just its content), the file's basename is folded into the config hash whenever an enabled HSL101 family scopes to filenames, so same-content differently-named files can't cross-contaminate each other's results. --no-cache disables reading from the cache but still writes to it, keeping it warm for the next run. --cache-dir overrides the base directory (still version-namespaced underneath the override). Cache read/write failures are silent by default (a broken cache must never fail a scan) but reported under --debug. Closes #16
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📝 WalkthroughWalkthroughThe linter now supports additive rule selection, per-file rule ignores, nested ChangesLint scan enhancements
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🔵 Low · up to The PR adds nested 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Python 3.11's dataclasses mutable-default check rejects MappingProxyType as a raw default even though 3.12+ special-cases it as safe.
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In `@src/house_lint/cache.py`:
- Around line 36-42: Update versioned_cache_dir to prevent unbounded
accumulation of cache data across releases by removing or pruning obsolete cache
entries/directories when establishing the current __version__ namespace.
Preserve the existing behavior of returning the version-specific cache path for
both default and user-supplied base directories.
- Around line 190-195: Update the cache-writing logic around the existing
path.write_text call to serialize the payload to a uniquely named temporary file
in cache_dir, then atomically replace path via os.replace. Ensure temporary
files are cleaned up on write or replacement failure, while preserving the
existing OSError/debug handling and cache_dir creation behavior.
In `@src/house_lint/cli.py`:
- Around line 207-235: Prevent stale cache entries in the scan loop around
_cache_keys, scan_file, and _write_cache_entry by ensuring the cache key matches
the bytes actually analyzed: preferably pass pre-read bytes through scan_file,
or re-hash after scanning and skip the cache write when the hash differs from
content_hash.
In `@src/house_lint/config.py`:
- Around line 245-253: Update _per_file_ignores to reject any non-empty key
beginning with “!” before calling _validate_git_ignore_patterns, raising
ConfigError consistent with the existing empty-key validation; preserve normal
Git-ignore-style pattern validation and ID handling for non-negated keys.
In `@src/house_lint/discovery.py`:
- Around line 316-361: Update _combined_gitignore_spec to reuse the parent
directory’s cached GitIgnoreSpec when the accumulated patterns are unchanged,
such as when _own_gitignore_lines returns no lines; alternatively memoize
GitIgnoreSpec instances by the accumulated line tuple. Preserve root-to-leaf
pattern ordering and ensure directories that add patterns still build and cache
their own spec.
In `@tests/integration/test_cli.py`:
- Around line 203-215: Update test_cache_is_populated_and_reused_across_runs to
remove the exact len(entries) == 2 assertion and instead assert that entries is
non-empty before selecting the finding-bearing cache entry with next(...).
- Around line 284-302: Update test_cache_hit_never_calls_scan_file so
fail_if_called records invocation in a mutable flag instead of raising
AssertionError; after the second cli.check call, assert the flag remains false,
while preserving the existing cache-hit output and exit-code assertions.
In `@tests/unit/test_discovery.py`:
- Around line 151-167: Extend the discovery tests with separate cases covering
_prefix_pattern’s anchored and trailing-slash branches: verify a nested
“/ignored.py” pattern matches only the directly containing directory’s file, not
the same filename beneath subdirectories, and verify a nested “build/” pattern
excludes files under both the containing directory’s build path and deeper
nested build directories. Assert the discovered files and skipped counts for
each case.
- Around line 238-247: Add an unignored control file alongside secret.py in
test_directory_name_starting_with_bang_is_not_read_as_negation, then assert
result.files contains that control file while excluding secret.py, so the test
verifies the directory is discovered and its .gitignore is honored.
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- include interpreter version in effective-config hash so cached results never replay across Python 3.11-3.14 syntax differences - write cache entries atomically via temp file + os.replace - self-ignore the cache base dir by writing a .gitignore marker - prune sibling version directories on write to bound cache growth
A directory excluded by an ancestor .gitignore is now pruned from traversal before its own nested .gitignore is ever read, matching git's real behavior. Previously, a negation in that nested file (e.g. '!foo.py') could resurrect files inside an otherwise-excluded directory, since the combined ignore spec folded in the child's patterns before the parent-level exclusion took effect. Also memoizes GitIgnoreSpec by accumulated line content (not just directory path) so sibling directories with no nested .gitignore of their own reuse one parsed spec instead of re-parsing identical patterns, and adds coverage for the leading-slash and trailing-slash directory branches of the nested-pattern rewrite.
scan_file() reads a file's bytes independently of the read that produced content_hash for the cache key, so if the file changed in between (e.g. an editor autosaving mid-scan), the cache write would persist findings under a hash that no longer describes the content that produced them. Re-hash after scanning and skip the cache write on mismatch; the scan result itself is still used for this run's findings/errors. Also fixes test_cache_hit_never_calls_scan_file, whose injected AssertionError was being silently swallowed by check()'s broad except Exception and reported as an unrelated exit-code mismatch.
A per-file-ignores key like "!tests/**" passed validation but compiled into a single-line GitIgnoreSpec that never matches anything, since negation only has meaning composed with a preceding positive pattern. The entry silently no-op'd with no error.
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- _prune_stale_version_dirs now only deletes sibling directories carrying a .house-lint-version marker, written when house-lint creates each version directory. Without this, a --cache-dir pointed at a shared pre-existing directory (e.g. ~/.cache) had every sibling directory rmtree'd on the first cache write. - read_cached_result now validates suppressed_count/files_scanned are ints before constructing CachedFileResult, so a corrupted-but-valid-JSON entry is treated as a graceful cache miss instead of crashing later when the caller accumulates the value.
- _prefix_pattern no longer strips the whole line before analyzing it, which discarded a significant leading space and escaped trailing whitespace in nested .gitignore patterns, and could misidentify a leading-whitespace- prefixed '#'/'!' as comment/negation syntax. Only .strip()'s result is now used to test for an all-whitespace line; the pattern body is built from the unstripped line, with only unescaped trailing whitespace removed via the new _strip_unescaped_trailing_whitespace helper. Verified against GitIgnoreSpec's actual parsing behavior for leading space, escaped trailing space, and leading-whitespace '#'/'!'. - _combined_gitignore_spec now checks each ancestor against the lines accumulated from its own ancestors before reading that ancestor's own .gitignore. An explicit file path (house-lint check src/ignored/foo.py) previously bypassed the walk-time directory pruning that already prevents this for normal tree walks, letting a nested negation resurrect a file real git keeps ignored. Extracted _spec_for_lines from the tail of _combined_gitignore_spec to share the cached-spec-build logic between the new ancestor check and the final combined-spec assembly.
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Discovery reimplements git's ignore rules on pathspec, and four cases diverged from git. All were reachable through ordinary `.gitignore` files, and all were invisible to the suite because nothing checked discovery against git itself. - `**` in a nested `.gitignore` expanded to `<prefix>/**/**`, which pathspec matches against the prefix directory and, in the `**/` form, against an immediate regular file that git leaves alone. Emit `<prefix>/**/*`. - `_ignored` probed each path in both file and directory form and OR'd the results. Git classifies a path once and then applies last-match-wins, so OR-ing let an ignore matching one form survive a negation matching only the other: `["cache", "!cache/"]` wrongly excluded `cache/`. Callers now pass `is_dir` and exactly one form is probed. This was a regression from the directory-pruning change earlier on this branch. - `_walk` starts inside a discovery root, so the root itself was the one directory never checked. `["src/", "!*.py"]` re-included every Python file under an ignored `src/`. - A trailing `/**` names a directory's contents, but pathspec matches the directory too, so house-lint pruned it before a negation underneath could be consulted. Normalise to `/**/*`. Cache fixes: - The self-ignore marker (a `.gitignore` containing `*`) was written into the cache base whatever it was, so `--cache-dir <project root>` hid the entire project from `git status`. It is now written only for house-lint's own default base. - Directory creation, markers and pruning ran on every cache write. They are per-run work, so they move to `prepare_cache_dir`, dropping four filesystem calls per cached file. Pruning stays gated on a write actually happening, so a run of pure cache hits cannot delete a concurrent process's namespace. - The cache namespace now carries a hash of house-lint's own sources, not just `__version__`. The version only moves at release, so editing a detector in a working checkout replayed the previous detector's findings. - A failed atomic replace now unlinks its per-PID temp file, which no later run could have recognised or cleaned up. Tests add `test_gitignore_parity.py`, which checks discovery against real `git check-ignore` over a scenario table: a case costs one entry and carries no expected-value literal, and one test proves the comparison fails when the two genuinely disagree. Randomised differential runs go from 19 mismatches in 250 pattern combinations to 7 in 4000, all of one documented pathspec divergence (negated directory-only patterns), and all erring toward linting a file git would ignore rather than skipping one. Also pins `files_skipped` semantics, since pruning made a skipped directory count once rather than once per contained file, and drops a redundant sort in `load_config`.
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…date cached text fields Two follow-ups from review of the previous commit. `_combined_gitignore_spec` detected an excluded ancestor and stopped loading deeper `.gitignore` files, but still returned the lines accumulated up to that point. Those lines can carry the resurrecting negation themselves, since git allows `src/generated/` and `!src/generated/foo.py` to sit in one file. An explicit `house-lint check src/generated/foo.py` was therefore selected, where git attributes the exclusion to the directory and reports it ignored. An excluded ancestor now yields a match-everything spec, so nothing beneath it can be re-included. `read_cached_result` validated its two count fields but passed everything else straight into `Finding`/`LintError`, which validate locations and accept any type elsewhere. A corrupted entry carrying a non-string `message` constructed fine and failed later, on `int < str`, while `ScanResult.to_dict()` sorted findings — during rendering, outside `check()`'s exception boundary, so the command exited with a traceback and no output instead of the documented cache miss. Text fields are now checked before construction. The parity table now also runs through explicit paths, which skip `_traversable_dirs` entirely and lean on `_combined_gitignore_spec` alone, so walk-time pruning cannot mask a wrong answer. That variant fails on four of the existing scenarios without this change — three more than the reported case.
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A scanned file was read three times: once to hash it for the cache key, once by the detectors, and once more to re-hash after the scan. Nothing tied those reads together, so an entry could describe content that was never scanned under that key. The file is now read exactly once, by SourceFile.load(), and both the cache key and the findings derive from that single buffer. Also in this pass: - Thread discovery's resolve() result through to SourceFile so a symlink is resolved once for the whole pipeline, closing a window where a retarget between the containment check and the read sent the read somewhere discovery never approved. - Add CacheReporter: the first cache failure of a run is always visible, the rest stay --debug-only. CI and pre-commit never pass --debug, so an unwritable cache directory used to make every scan silently pay full re-analysis with nothing to explain why. - Retry a cache write once when the directory vanished mid-run (a concurrent prune), but never for a permissions or out-of-space failure, which will not fix itself between two adjacent calls. - Split the cache write helper so its False return means only "the write failed". It previously also meant "this file isn't cacheable", which with the new circuit breaker would have let one unhashable file disable caching for the remainder of the run. - Add a randomized differential gitignore suite (marked slow) alongside the curated parity table, with the measured divergence rates documented and pinned under a ceiling.
The randomized suite is deselected locally so a bare `pytest` stays fast, which also meant its divergence ceilings were only ever checked when someone remembered to pass `-m slow`. A tripwire nobody walks into catches nothing, so CI now clears the marker filter and runs the full suite on all four Python versions — `re` and `pathspec` behaviour is what the ceilings measure, and that is exactly what can differ across them. Adds ~15s to each matrix leg.
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Selecting the slow suite through a marker meant two commands that had to stay in sync with it — `-m 'not slow'` in addopts and `-m ""` in the workflow — and getting the workflow half wrong fails silently green, because a deselected test looks exactly like a test that passed. The suite now skips unless `CI` is set, which every CI provider exports. Both `addopts` and the `markers` registration are gone, the workflow runs a bare `uv run pytest`, and there is nothing left to keep in sync. Locally the suite reports as skipped rather than vanishing from the count, so it is visible without being run; prefix with `CI=1` to run it by hand.
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Configured 'exclude' takes Git-ignore syntax, negations included, but was matched only against the path in hand. With exclude = ["src/generated/", "!src/generated/foo.py"] a walk prunes 'generated' at _traversable_dirs and never reaches the negation, while an explicit 'house-lint check src/generated/foo.py' goes straight to the file-level match where the negation is the last matching line and wins - so a full scan skipped the file and naming it linted it. _combined_gitignore_spec already carried this ancestor check for .gitignore; this gives builtin_spec/exclude_spec the same one, cached per directory so the walk pays O(depth) once per directory rather than once per file.
discovered.files keeps the spelling the user typed, so an explicit path containing '..' - src/../tests/a.py, with both directories present - reached pattern matching literally and a configured "tests/**" never matched it, running a rule the config had disabled for everything under tests/. Resolved rather than collapsed lexically: a lexical '..' collapse is only correct when no traversed component is a symlink. With link/ -> x/y/, the OS reads link/../foo.py as x/foo.py while the lexical form reads foo.py, so a pattern written for the file's real location silently stops matching. Resolving cannot drift from the file actually opened, and it is already the identity discovery uses - 'selected' is keyed by resolved path, which is what makes a symlink and its target deduplicate. Findings still report the path as typed.
…r checks _has_excluded_ancestor and _combined_gitignore_spec each rebuilt the same root-to-directory path sequence, with their own copy of the relative_to/ValueError guard. _ancestor_chain owns it once; both consume it.
…h matching Neither rule was stated where a user configuring exclude or per-file-ignores would look: that exclusion attaches to the directory (so a negation cannot resurrect a file beneath an excluded one, however the file is reached), and that per-file-ignores patterns match a file's resolved location rather than the spelling used to reach it.
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In `@src/house_lint/discovery.py`:
- Around line 124-136: The _strip_unescaped_trailing_whitespace function must
preserve trailing whitespace only when preceded by an odd number of consecutive
backslashes; count backward across all adjacent backslashes instead of checking
only the immediately preceding character. Add a regression test covering an even
backslash count, such as a.py\\ followed by a space, and verify that the space
is stripped.
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_strip_unescaped_trailing_whitespace treated any single preceding backslash as an escape, but backslashes quote each other pairwise, so it is the parity of the run that decides whether the space survives. Two backslashes plus a space is the separating case: git strips the space and ignores a directory whose name ends in one backslash, while house-lint kept the space and matched a different name - so a directory git ignores was walked and linted. The divergence direction was the safe one (over-linting, never hiding a finding), consistent with the guarantee documented in docs/configuration.md. Pinned by two parity scenarios covering both parities against real git check-ignore. That needed git_ignored to pass -z: without it git applies its C-style quoting to any path containing a backslash, and the comparison then fails on the encoding rather than on the ignore decision.
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Every body in CORNER_BODIES carried at most one `**`, so no trial ever reached _prefix_pattern's two-`**` path. Adding `**/**` and `**/**/` trips the safety assertion: house-lint skips immediate files git lints. Red on purpose; the fix follows.
git collapses a run of consecutive `**` segments into one, verified directly. Only the directory-only spellings fail: `**/**/` and `**/**/**/` swallow the immediate file their single-`**` counterparts spare. The non-slash forms already agreed. Red on purpose; the fix follows.
git reads a run of consecutive `**` segments as one, so `**/**/` means what `**/` means. _prefix_pattern only recognised the one-segment spelling; the repeated form fell through to the generic slash-containing branch and became <prefix>/**/**/, which GitIgnoreSpec matches against an immediate regular file git leaves alone. Collapsing the run before the branch chain makes the core == '**' case cover the whole family instead of one spelling. Parity suite green; adversarial fuzz divergence drops 6.80% -> 2.47%, back under its ceiling.
check src/../tests silently skips what check tests selects, because the ancestor walk uses the unresolved spelling and treats src as an ancestor of tests. Red on purpose; the fix follows.
Both ancestor walks key off relative_to(root), which keeps a '..' as a literal part — so check src/../tests enumerated src as an ancestor of tests and applied its .gitignore, skipping files check tests selects. Walking the resolved directory (already containment-checked) makes discovery follow the rule per-file-ignores already documents: match the resolved location, not the spelling used to reach it.
The claim that divergence 'always errs toward linting a file git would ignore, never toward silently skipping one' was the sole justification for the current design, and it is false. pathspec will not let a directory-only negation win for a directory path, so house-lint prunes a subtree git walks and hides every finding underneath. Records both known divergences and their shared root cause, replaces the invariant with a measured ceiling, regenerates the adversarial rate (1.47%/22 -> 2.47%/37), and adds a strict xfail pinning the new case. test_no_divergence_ever_skips_a_file_git_would_lint still fails on any under-linting outside the named class; a second test caps how much the named class may account for. Includes the prior-art survey that identifies the architectural fix: a per-directory matcher stack evaluated during traversal, as git, ripgrep's ignore crate, and fd all do.
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A repository controls the default cache path, and two ways in are open: the predictable <version>-<fingerprint> child can be a symlink even when the base is real, and the <entry>.<pid>.tmp path can be a symlink that write_text() follows before os.replace() runs. Also pins that a stale temp file from a crashed run must not permanently disable caching for that entry. Red on purpose; the fixes follow.
The version namespace is derived from house-lint's version and source fingerprint, so a repository can ship a real .house-lint-cache/ whose predictable <version>-<fingerprint> child is a symlink and have entries written outside the checkout. The guard now checks the whole default cache path, not just the base. Separately, the entry temp file (<content>-<config>.json.<pid>.tmp) was opened with write_text(), which follows a symlink and truncates its target before os.replace() runs. It now uses O_CREAT|O_EXCL, matching _write_marker_if_absent, with one unlink-and-retry so a stale temp file from a crashed run cannot permanently disable caching for that entry. Verified end-to-end: a check against a repo with a symlinked version child now reports 'caching disabled' and writes nothing outside.
git_env inherited GIT_DIR/GIT_WORK_TREE/GIT_INDEX_FILE, any of which overrides cwd — so a caller with one set would have had the parity suites compare against a different repository and still exit 0. These suites are what catch house-lint drifting from git; a harness that can silently measure the wrong tree defeats their only purpose. Also reaches the resolved_paths mapping through the symlink alone. Passing it alongside its target deduplicated it away, leaving every surviving entry with resolved == reported and the mapping untested.
The explicit-directory fix in 3909102 left the explicit-file branch walking the unresolved spelling, so check src/../tests/a.py still applies src/.gitignore to a file under tests. Separately, _prune_stale_version_dirs decides ownership with is_file(), which follows symlinks — an unrelated directory whose .house-lint-version is a link to any regular file is classified as house-lint's and passed to shutil.rmtree. Red on purpose; the fixes follow.
The explicit-directory fix left the file branch walking the unresolved spelling, so check src/../tests and check src/../tests/a.py disagreed with each other as well as with git. Both branches now decide ignore ancestry from where the path resolves to, reporting the spelling as typed. _prune_stale_version_dirs decided ownership with is_file(), which follows symlinks — an unrelated directory whose .house-lint-version links to any regular file was classified as house-lint's and recursively deleted. Verified: a sibling holding important.txt now survives the prune. The marker is written with O_EXCL and so can never be a symlink when house-lint wrote it, meaning this rejects nothing of ours.
The traceback is printed by scan_source, which a cache hit skips — so the first --debug run showed the exception type and offending source, and every identical run after it showed only the one-line structured error. Reaching for --debug to diagnose a parse failure gave less information the second time, with nothing on screen to explain why. Only files whose cached result carries errors are re-scanned; clean files still hit the cache, so the diagnostic mode stays fast.
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| """ | ||
| path = _entry_path(cache_dir, content_hash, config_hash) | ||
| try: | ||
| raw = path.read_text(encoding="utf-8") |
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When an untrusted checkout pre-creates the predictable default-cache entry as a symlink, this unbounded read_text() follows its target even though only the cache directory components were checked. A link to a FIFO can block a normal scan indefinitely, and a link to /dev/zero or another unbounded source can exhaust memory before corruption handling runs. Open entries with no-follow semantics and verify/bound the regular file before reading.
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| _CONTENTS_GLOB = re.compile(r"(?<!\*\*)/\*\*(/?)\Z") | ||
| # Two or more whole `**` segments in a row, which git reads as a single `**`. | ||
| _DOUBLE_STAR_RUN = re.compile(r"\*\*(?:/\*\*)+") |
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When a nested .gitignore contains [ab]**/**/ and src/abc/a.py exists, Git leaves that immediate file included, but these regexes treat the **/** substring inside the larger [ab]** segment as consecutive whole ** segments. The rewrite consequently becomes src/**/[ab]**/, which causes discovery to prune abc and silently hide a.py; both collapsing and trailing-contents normalization need to recognize slash-delimited, unescaped ** segments rather than adjacent asterisks inside another segment.
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Nested
.gitignoresupport.gitignore, so nested.gitignorefiles in subdirectories (e.g. vendored/generated code) were silently ignored and house-lint scanned files git itself would skip..gitignorepatterns are now combined with the root.gitignoreinto a single root-anchored spec per directory, in root-to-leaf order, soGitIgnoreSpec's last-matching-line-wins semantics reproduce git's actual precedence — including a closer.gitignore's negation overriding a farther one's ignore.sub[1],!important) are escaped before being embedded into the combined pattern, so they're matched as literal path segments instead of reinterpreted as pattern syntax.--no-gitignorecontinues to disable gitignore handling at every level.extend-select/extend-ignore--selectpreviously replaced the configured select list wholesale, so passing--selectfor one extra rule silently dropped every other configured rule.extend-select/extend-ignore— in both TOML config and as CLI flags — now layer additively on top of the base selection (configuredselect/ignore, or a--selectoverride) regardless of where the base came from. CLI--ignorestill always wins as the final override.docs/configuration.mdare updated to document nested-gitignore support (shipped in the prior commit) and the new selection precedence, since both still described the old root-only/wholesale-override behavior.per-file-ignores[tool.house-lint.per-file-ignores]maps root-relative Git-ignore-style glob patterns to rule IDs to drop for matching files, without changing the global selection for everything else (e.g. silencingHSL002fortests/**without disabling it project-wide).HSL900, the same as suppressing an already-disabled rule.HSL900can never appear in aper-file-ignoresvalue, matching the existingselect/ignore/extend-select/extend-ignoreconstraint.Per-file result caching
<root>/.house-lint-cache/<house-lint version>/(gitignored by default), keyed by the file's content hash and its effective per-file config hash (resolved rule set plusHSL101/HSL102/HSL103options). A cache hit skips tokenization, parsing, and rule execution entirely for that file.(content hash, config hash)rather than by file path, so two files with identical content and effective config can share an entry — cached findings/errors are stored without their path field and re-attached to the actual file's path on read. BecauseHSL101'sfilenamesscope makes output depend on the file's name (not just its content), the basename is folded into the config hash whenever an enabledHSL101family scopes to filenames, preventing same-content differently-named files from cross-contaminating each other's results.--no-cachedisables reading from the cache but still writes to it, keeping it warm for the next run.--cache-diroverrides the base directory (still version-namespaced underneath the override).Correctness hardening on the scan pipeline
An adversarial review of the above turned up 14 findings; these are the ones that needed code changes.
SourceFile.load(), and both the cache key and the findings derive from that single buffer.test_each_scanned_file_is_read_exactly_onceintercepts the sole file-reading entry point to keep it that way.resolve()result is threaded through toSourceFileinstead of being recomputed, so a symlink is resolved once for the whole pipeline.--debug-only, and CI and pre-commit never pass--debug— so an unwritable cache directory made every scan silently pay full re-analysis with nothing to explain why.CacheReporternow makes the first failure of a run always visible and keeps the rest--debug-only, since a broken cache directory fails once per scanned file. A failed cache write still never fails the scan.Falseboth for "the write failed" and for "this file isn't cacheable"; combined with the new circuit breaker, the second meaning would have latched the first. Those are now separate paths.Differential testing against real git
Because the gitignore support above is a reimplementation of git's semantics on
pathspecrather than a call out to git, it can drift.tests/integration/test_gitignore_parity.pyruns a curated table of pattern shapes against realgit check-ignore. A scenario needs no expected-value literal — git supplies it — so adding a regression case costs one table entry.tests/integration/test_gitignore_fuzz.pygenerates combinations nobody thought to write down. The hard guarantee is the direction of any divergence: house-lint may lint a file git would ignore, but must never skip a file git would lint. Over-linting is visible and fixable in oneexcludeline; under-linting is silent, and a linter that silently skips a file has failed at its only job. The divergence rate is a tripwire under a documented ceiling.CIis set and skips otherwise, rather than being selected by a pytest marker — one less thing to keep in sync, and a workflow that drifts out of sync with a marker flag fails silently green.docs/configuration.mdand surveyed in Decision record: keep pathspec and the known gitignore divergence #26.Closes #13
Closes #14
Closes #15
Closes #16
Follow-ups filed rather than fixed here: #25 (unbounded cache growth) and #26 (gitignore divergence survey).
Summary by CodeRabbit
.gitignorefiles with Git-compatible precedence..gitignoreprocessing.