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Add support for configuring knot in pyproject.toml files (#15493)

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## Summary

This PR adds support for configuring Red Knot in the `tool.knot` section
of the project's
`pyproject.toml` section. Options specified on the CLI precede the
options in the configuration file.

This PR only supports the `environment` and the `src.root` options for
now.
Other options will be added as separate PRs.

There are also a few concerns that I intentionally ignored as part of
this PR:

* Handling of relative paths: We need to anchor paths relative to the
current working directory (CLI), or the project (`pyproject.toml` or
`knot.toml`)
* Tracking the source of a value. Diagnostics would benefit from knowing
from which configuration a value comes so that we can point the user to
the right configuration file (or CLI) if the configuration is invalid.
* Schema generation and there's a lot more; see
https://github.com/astral-sh/ruff/issues/15491

This PR changes the default for first party codes: Our existing default
was to only add the project root. Now, Red Knot adds the project root
and `src` (if such a directory exists).

Theoretically, we'd have to add a file watcher event that changes the
first-party search paths if a user later creates a `src` directory. I
think this is pretty uncommon, which is why I ignored the complexity for
now but I can be persuaded to handle it if it's considered important.

Part of https://github.com/astral-sh/ruff/issues/15491

## Test Plan

Existing tests, new file watching test demonstrating that changing the
python version and platform is correctly reflected.
This commit is contained in:
Micha Reiser 2025-01-17 09:41:06 +01:00 • committed by GitHub
parent 9ed67ba33e
commit eb47a6634d
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36 changed files with 820 additions and 413 deletions
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16
crates/ruff_graph/src/db.rs
View file

@ -30,22 +30,10 @@ pub struct ModuleDb {
impl ModuleDb {
/// Initialize a [`ModuleDb`] from the given source root.
pub fn from_src_roots(
mut src_roots: impl Iterator<Item = SystemPathBuf>,
src_roots: Vec<SystemPathBuf>,
python_version: PythonVersion,
) -> Result<Self> {
let search_paths = {
// Use the first source root.
let src_root = src_roots
.next()
.ok_or_else(|| anyhow::anyhow!("No source roots provided"))?;
let mut search_paths = SearchPathSettings::new(src_root);
// Add the remaining source roots as extra paths.
search_paths.extra_paths.extend(src_roots);
search_paths
};
let search_paths = SearchPathSettings::new(src_roots);
let db = Self::default();
Program::from_settings(