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Detect empty implicit namespace packages (#14236)

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## Summary

The implicit namespace package rule currently fails to detect cases like
the following:

```text
foo/
├── __init__.py
└── bar/
    └── baz/
        └── __init__.py
```

The problem is that we detect a root at `foo`, and then an independent
root at `baz`. We _would_ detect that `bar` is an implicit namespace
package, but it doesn't contain any files! So we never check it, and
have no place to raise the diagnostic.

This PR adds detection for these kinds of nested packages, and augments
the `INP` rule to flag the `__init__.py` file above with a specialized
message. As a side effect, I've introduced a dedicated `PackageRoot`
struct which we can pass around in lieu of Yet Another `Path`.

For now, I'm only enabling this in preview (and the approach doesn't
affect any other rules). It's a bug fix, but it may end up expanding the
rule.

Closes https://github.com/astral-sh/ruff/issues/13519.
This commit is contained in:
Charlie Marsh 2024-11-09 22:03:34 -05:00 • committed by GitHub
parent 94dee2a36d
commit c7d48e10e6
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26 changed files with 282 additions and 83 deletions
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17
crates/ruff_server/src/fix.rs
View file

@ -2,20 +2,20 @@ use std::borrow::Cow;
use rustc_hash::FxHashMap;
use ruff_linter::{
linter::{FixerResult, LinterResult},
packaging::detect_package_root,
settings::{flags, types::UnsafeFixes, LinterSettings},
};
use ruff_notebook::SourceValue;
use ruff_source_file::LineIndex;
use crate::{
edit::{Replacement, ToRangeExt},
resolve::is_document_excluded,
session::DocumentQuery,
PositionEncoding,
};
use ruff_linter::package::PackageRoot;
use ruff_linter::{
linter::{FixerResult, LinterResult},
packaging::detect_package_root,
settings::{flags, types::UnsafeFixes, LinterSettings},
};
use ruff_notebook::SourceValue;
use ruff_source_file::LineIndex;
/// A simultaneous fix made across a single text document or among an arbitrary
/// number of notebook cells.
@ -49,6 +49,7 @@ pub(crate) fn fix_all(
.expect("a path to a document should have a parent path"),
&linter_settings.namespace_packages,
)
.map(PackageRoot::root)
} else {
None
};