Respect --force-exclude for files passed via stdin

resources/test/project/README.md

@@ -9,29 +9,29 @@ Running from the repo root should pick up and enforce the appropriate settings f
 
 ```
 ∴ cargo run resources/test/project/
-Found 7 error(s).
 resources/test/project/examples/.dotfiles/script.py:1:1: I001 Import block is un-sorted or un-formatted
 resources/test/project/examples/.dotfiles/script.py:1:8: F401 `numpy` imported but unused
 resources/test/project/examples/.dotfiles/script.py:2:17: F401 `app.app_file` imported but unused
 resources/test/project/examples/docs/docs/file.py:1:1: I001 Import block is un-sorted or un-formatted
 resources/test/project/examples/docs/docs/file.py:8:5: F841 Local variable `x` is assigned to but never used
-resources/test/project/src/file.py:1:8: F401 `os` imported but unused
-resources/test/project/src/import_file.py:1:1: I001 Import block is un-sorted or un-formatted
+resources/test/project/project/file.py:1:8: F401 `os` imported but unused
+resources/test/project/project/import_file.py:1:1: I001 Import block is un-sorted or un-formatted
+Found 7 error(s).
 6 potentially fixable with the --fix option.
 ```
 
 Running from the project directory itself should exhibit the same behavior:
 
 ```
 ∴ (cd resources/test/project/ && cargo run .)
-Found 7 error(s).
 examples/.dotfiles/script.py:1:1: I001 Import block is un-sorted or un-formatted
 examples/.dotfiles/script.py:1:8: F401 `numpy` imported but unused
 examples/.dotfiles/script.py:2:17: F401 `app.app_file` imported but unused
 examples/docs/docs/file.py:1:1: I001 Import block is un-sorted or un-formatted
 examples/docs/docs/file.py:8:5: F841 Local variable `x` is assigned to but never used
-src/file.py:1:8: F401 `os` imported but unused
-src/import_file.py:1:1: I001 Import block is un-sorted or un-formatted
+project/file.py:1:8: F401 `os` imported but unused
+project/import_file.py:1:1: I001 Import block is un-sorted or un-formatted
+Found 7 error(s).
 6 potentially fixable with the --fix option.
 ```
 
@@ -40,9 +40,9 @@ files:
 
 ```
 ∴ (cd resources/test/project/examples/docs && cargo run .)
-Found 2 error(s).
 docs/file.py:1:1: I001 Import block is un-sorted or un-formatted
 docs/file.py:8:5: F841 Local variable `x` is assigned to but never used
+Found 2 error(s).
 1 potentially fixable with the --fix option.
 ```
 
@@ -51,8 +51,6 @@ file paths from the current working directory:
 
 ```
 ∴ (cargo run -- --config=resources/test/project/pyproject.toml resources/test/project/)
-Found 11 error(s).
-resources/test/project/examples/.dotfiles/script.py:1:1: I001 Import block is un-sorted or un-formatted
 resources/test/project/examples/.dotfiles/script.py:1:8: F401 `numpy` imported but unused
 resources/test/project/examples/.dotfiles/script.py:2:17: F401 `app.app_file` imported but unused
 resources/test/project/examples/docs/docs/concepts/file.py:1:8: F401 `os` imported but unused
@@ -61,29 +59,36 @@ resources/test/project/examples/docs/docs/file.py:1:8: F401 `os` imported but un
 resources/test/project/examples/docs/docs/file.py:3:8: F401 `numpy` imported but unused
 resources/test/project/examples/docs/docs/file.py:4:27: F401 `docs.concepts.file` imported but unused
 resources/test/project/examples/excluded/script.py:1:8: F401 `os` imported but unused
-resources/test/project/src/file.py:1:8: F401 `os` imported but unused
-resources/test/project/src/import_file.py:1:1: I001 Import block is un-sorted or un-formatted
-11 potentially fixable with the --fix option.
+resources/test/project/project/file.py:1:8: F401 `os` imported but unused
+Found 9 error(s).
+9 potentially fixable with the --fix option.
 ```
 
 Running from a parent directory should this "ignore" the `exclude` (hence, `concepts/file.py` gets
 included in the output):
 
 ```
 ∴ (cd resources/test/project/examples && cargo run -- --config=docs/pyproject.toml .)
-Found 4 error(s).
 docs/docs/concepts/file.py:5:5: F841 Local variable `x` is assigned to but never used
 docs/docs/file.py:1:1: I001 Import block is un-sorted or un-formatted
 docs/docs/file.py:8:5: F841 Local variable `x` is assigned to but never used
 excluded/script.py:5:5: F841 Local variable `x` is assigned to but never used
+Found 4 error(s).
 1 potentially fixable with the --fix option.
 ```
 
 Passing an excluded directory directly should report errors in the contained files:
 
 ```
 ∴ cargo run resources/test/project/examples/excluded/
-Found 1 error(s).
 resources/test/project/examples/excluded/script.py:1:8: F401 `os` imported but unused
+Found 1 error(s).
 1 potentially fixable with the --fix option.
 ```
+
+Unless we `--force-exclude`:
+
+```
+∴ cargo run resources/test/project/examples/excluded/ --force-exclude
+∴ cargo run resources/test/project/examples/excluded/script.py --force-exclude
+```

src/commands.rs

@@ -115,17 +115,24 @@ fn read_from_stdin() -> Result<String> {
 /// Run the linter over a single file, read from `stdin`.
 pub fn run_stdin(
     filename: Option<&Path>,
-    strategy: &PyprojectDiscovery,
+    pyproject_strategy: &PyprojectDiscovery,
+    file_strategy: &FileDiscovery,
+    overrides: &Overrides,
     autofix: fixer::Mode,
 ) -> Result<Diagnostics> {
-    let package_root = filename
-        .and_then(std::path::Path::parent)
-        .and_then(packages::detect_package_root);
-    let stdin = read_from_stdin()?;
-    let settings = match strategy {
+    if let Some(filename) = filename {
+        if !resolver::python_file_at_path(filename, pyproject_strategy, file_strategy, overrides)? {
+            return Ok(Diagnostics::default());
+        }
+    }
+    let settings = match pyproject_strategy {
         PyprojectDiscovery::Fixed(settings) => settings,
         PyprojectDiscovery::Hierarchical(settings) => settings,
     };
+    let package_root = filename
+        .and_then(Path::parent)
+        .and_then(packages::detect_package_root);
+    let stdin = read_from_stdin()?;
     let mut diagnostics = lint_stdin(filename, package_root, &stdin, settings, autofix)?;
     diagnostics.messages.sort_unstable();
     Ok(diagnostics)

src/main.rs

@@ -224,7 +224,13 @@ fn inner_main() -> Result<ExitCode> {
 
         // Generate lint violations.
         let diagnostics = if is_stdin {
-            commands::run_stdin(cli.stdin_filename.as_deref(), &pyproject_strategy, autofix)?
+            commands::run_stdin(
+                cli.stdin_filename.as_deref(),
+                &pyproject_strategy,
+                &file_strategy,
+                &overrides,
+                autofix,
+            )?
         } else {
             commands::run(
                 &cli.files,

src/resolver.rs

@@ -164,8 +164,8 @@ pub fn resolve_settings(
 
 /// Return `true` if the given file should be ignored based on the exclusion
 /// criteria.
-fn is_excluded(file_path: &str, file_basename: &str, exclude: &globset::GlobSet) -> bool {
-    exclude.is_match(file_path) || exclude.is_match(file_basename)
+fn match_exclusion(file_path: &str, file_basename: &str, exclusion: &globset::GlobSet) -> bool {
+    exclusion.is_match(file_path) || exclusion.is_match(file_basename)
 }
 
 /// Return `true` if the `Path` appears to be that of a Python file.
@@ -207,35 +207,9 @@ pub fn python_files_in_path(
         }
     }
 
-    // Omit any paths that are nested within excluded ancestors. This ensures that
-    // if we pass `subdir/file.py`, and `subdir` is excluded, then we don't
-    // "miss" that exclusion when walking from `subdir/file.py` below.
+    // Check if the paths themselves are excluded.
     if file_strategy.force_exclude {
-        paths.retain(|path| {
-            for path in path.ancestors() {
-                let settings = resolver.resolve(path, pyproject_strategy);
-                match fs::extract_path_names(path) {
-                    Ok((file_path, file_basename)) => {
-                        if !settings.exclude.is_empty()
-                            && is_excluded(file_path, file_basename, &settings.exclude)
-                        {
-                            debug!("Ignored path via `exclude`: {:?}", path);
-                            return false;
-                        } else if !settings.extend_exclude.is_empty()
-                            && is_excluded(file_path, file_basename, &settings.extend_exclude)
-                        {
-                            debug!("Ignored path via `extend-exclude`: {:?}", path);
-                            return false;
-                        }
-                    }
-                    Err(err) => {
-                        debug!("Ignored path due to error in parsing: {:?}: {}", path, err);
-                        return false;
-                    }
-                }
-            }
-            true
-        });
+        paths.retain(|path| !is_file_excluded(path, &resolver, pyproject_strategy));
         if paths.is_empty() {
             return Ok((vec![], resolver));
         }
@@ -298,19 +272,23 @@ pub fn python_files_in_path(
 
             // Respect our own exclusion behavior.
             if let Ok(entry) = &result {
-                if file_strategy.force_exclude || entry.depth() > 0 {
+                if entry.depth() > 0 {
                     let path = entry.path();
                     let resolver = resolver.read().unwrap();
                     let settings = resolver.resolve(path, pyproject_strategy);
                     match fs::extract_path_names(path) {
                         Ok((file_path, file_basename)) => {
                             if !settings.exclude.is_empty()
-                                && is_excluded(file_path, file_basename, &settings.exclude)
+                                && match_exclusion(file_path, file_basename, &settings.exclude)
                             {
                                 debug!("Ignored path via `exclude`: {:?}", path);
                                 return WalkState::Skip;
                             } else if !settings.extend_exclude.is_empty()
-                                && is_excluded(file_path, file_basename, &settings.extend_exclude)
+                                && match_exclusion(
+                                    file_path,
+                                    file_basename,
+                                    &settings.extend_exclude,
+                                )
                             {
                                 debug!("Ignored path via `extend-exclude`: {:?}", path);
                                 return WalkState::Skip;
@@ -337,6 +315,72 @@ pub fn python_files_in_path(
     Ok((files.into_inner().unwrap(), resolver.into_inner().unwrap()))
 }
 
+/// Return `true` if the Python file at `Path` is _not_ excluded.
+pub fn python_file_at_path(
+    path: &Path,
+    pyproject_strategy: &PyprojectDiscovery,
+    file_strategy: &FileDiscovery,
+    overrides: &Overrides,
+) -> Result<bool> {
+    if !file_strategy.force_exclude {
+        return Ok(true);
+    }
+
+    // Normalize the path (e.g., convert from relative to absolute).
+    let path = fs::normalize_path(path);
+
+    // Search for `pyproject.toml` files in all parent directories.
+    let mut resolver = Resolver::default();
+    for ancestor in path.ancestors() {
+        let pyproject = ancestor.join("pyproject.toml");
+        if pyproject.is_file() {
+            if has_ruff_section(&pyproject)? {
+                let (root, settings) =
+                    resolve_scoped_settings(&pyproject, &Relativity::Parent, Some(overrides))?;
+                resolver.add(root, settings);
+            }
+        }
+    }
+
+    // Check exclusions.
+    Ok(!is_file_excluded(&path, &resolver, pyproject_strategy))
+}
+
+/// Return `true` if the given top-level `Path` should be excluded.
+fn is_file_excluded(
+    path: &Path,
+    resolver: &Resolver,
+    pyproject_strategy: &PyprojectDiscovery,
+) -> bool {
+    // TODO(charlie): Respect gitignore.
+    for path in path.ancestors() {
+        if path.file_name().is_none() {
+            break;
+        }
+        let settings = resolver.resolve(path, pyproject_strategy);
+        match fs::extract_path_names(path) {
+            Ok((file_path, file_basename)) => {
+                if !settings.exclude.is_empty()
+                    && match_exclusion(file_path, file_basename, &settings.exclude)
+                {
+                    debug!("Ignored path via `exclude`: {:?}", path);
+                    return true;
+                } else if !settings.extend_exclude.is_empty()
+                    && match_exclusion(file_path, file_basename, &settings.extend_exclude)
+                {
+                    debug!("Ignored path via `extend-exclude`: {:?}", path);
+                    return true;
+                }
+            }
+            Err(err) => {
+                debug!("Ignored path due to error in parsing: {:?}: {}", path, err);
+                return true;
+            }
+        }
+    }
+    false
+}
+
 #[cfg(test)]
 mod tests {
     use std::path::Path;
@@ -346,7 +390,7 @@ mod tests {
     use path_absolutize::Absolutize;
 
     use crate::fs;
-    use crate::resolver::{is_excluded, is_python_path};
+    use crate::resolver::{is_python_path, match_exclusion};
     use crate::settings::types::FilePattern;
 
     #[test]
@@ -383,7 +427,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -398,7 +442,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -415,7 +459,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -430,7 +474,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -447,7 +491,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -464,7 +508,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(is_excluded(
+        assert!(match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)
@@ -481,7 +525,7 @@ mod tests {
                 .to_path_buf(),
         );
         let (file_path, file_basename) = fs::extract_path_names(&path)?;
-        assert!(!is_excluded(
+        assert!(!match_exclusion(
             file_path,
             file_basename,
             &make_exclusion(exclude,)