[refurb] Add fixes for FURB101, FURB103 (#20520)

## Summary

Part of `PTH-*` fixes:
https://github.com/astral-sh/ruff/pull/19404#issuecomment-3089639686

## Test Plan
`cargo nextest run furb`

crates/ruff_linter/src/preview.rs

@@ -259,3 +259,13 @@ pub(crate) const fn is_b006_unsafe_fix_preserve_assignment_expr_enabled(
 ) -> bool {
     settings.preview.is_enabled()
 }
+
+// https://github.com/astral-sh/ruff/pull/20520
+pub(crate) const fn is_fix_read_whole_file_enabled(settings: &LinterSettings) -> bool {
+    settings.preview.is_enabled()
+}
+
+// https://github.com/astral-sh/ruff/pull/20520
+pub(crate) const fn is_fix_write_whole_file_enabled(settings: &LinterSettings) -> bool {
+    settings.preview.is_enabled()
+}

crates/ruff_linter/src/rules/refurb/helpers.rs

@@ -1,14 +1,13 @@
 use std::borrow::Cow;
 
-use ruff_python_ast::name::Name;
-use ruff_python_ast::{self as ast, Expr, parenthesize::parenthesized_range};
+use ruff_python_ast::PythonVersion;
+use ruff_python_ast::{self as ast, Expr, name::Name, parenthesize::parenthesized_range};
 use ruff_python_codegen::Generator;
 use ruff_python_semantic::{BindingId, ResolvedReference, SemanticModel};
 use ruff_text_size::{Ranged, TextRange};
 
 use crate::checkers::ast::Checker;
 use crate::{Applicability, Edit, Fix};
-use ruff_python_ast::PythonVersion;
 
 /// Format a code snippet to call `name.method()`.
 pub(super) fn generate_method_call(name: Name, method: &str, generator: Generator) -> String {
@@ -345,12 +344,8 @@ pub(super) fn parenthesize_loop_iter_if_necessary<'a>(
     let iter_in_source = locator.slice(iter);
 
     match iter {
-        ast::Expr::Tuple(tuple) if !tuple.parenthesized => {
-            Cow::Owned(format!("({iter_in_source})"))
-        }
-        ast::Expr::Lambda(_) | ast::Expr::If(_)
-            if matches!(location, IterLocation::Comprehension) =>
-        {
+        Expr::Tuple(tuple) if !tuple.parenthesized => Cow::Owned(format!("({iter_in_source})")),
+        Expr::Lambda(_) | Expr::If(_) if matches!(location, IterLocation::Comprehension) => {
             Cow::Owned(format!("({iter_in_source})"))
         }
         _ => Cow::Borrowed(iter_in_source),

crates/ruff_linter/src/rules/refurb/mod.rs

@@ -12,6 +12,7 @@ mod tests {
     use test_case::test_case;
 
     use crate::registry::Rule;
+    use crate::settings::types::PreviewMode;
     use crate::test::test_path;
     use crate::{assert_diagnostics, settings};
 
@@ -62,6 +63,25 @@ mod tests {
         Ok(())
     }
 
+    #[test_case(Rule::ReadWholeFile, Path::new("FURB101.py"))]
+    #[test_case(Rule::WriteWholeFile, Path::new("FURB103.py"))]
+    fn preview_rules(rule_code: Rule, path: &Path) -> Result<()> {
+        let snapshot = format!(
+            "preview_{}_{}",
+            rule_code.noqa_code(),
+            path.to_string_lossy()
+        );
+        let diagnostics = test_path(
+            Path::new("refurb").join(path).as_path(),
+            &settings::LinterSettings {
+                preview: PreviewMode::Enabled,
+                ..settings::LinterSettings::for_rule(rule_code)
+            },
+        )?;
+        assert_diagnostics!(snapshot, diagnostics);
+        Ok(())
+    }
+
     #[test]
     fn write_whole_file_python_39() -> Result<()> {
         let diagnostics = test_path(

crates/ruff_linter/src/rules/refurb/rules/read_whole_file.rs

@@ -1,14 +1,17 @@
+use ruff_diagnostics::{Applicability, Edit, Fix};
 use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::visitor::{self, Visitor};
-use ruff_python_ast::{self as ast, Expr};
+use ruff_python_ast::{
+    self as ast, Expr, Stmt,
+    visitor::{self, Visitor},
+};
 use ruff_python_codegen::Generator;
 use ruff_text_size::{Ranged, TextRange};
 
-use crate::Violation;
 use crate::checkers::ast::Checker;
 use crate::fix::snippet::SourceCodeSnippet;
-
+use crate::importer::ImportRequest;
 use crate::rules::refurb::helpers::{FileOpen, find_file_opens};
+use crate::{FixAvailability, Violation};
 
 /// ## What it does
 /// Checks for uses of `open` and `read` that can be replaced by `pathlib`
@@ -31,6 +34,8 @@ use crate::rules::refurb::helpers::{FileOpen, find_file_opens};
 ///
 /// contents = Path(filename).read_text()
 /// ```
+/// ## Fix Safety
+/// This rule's fix is marked as unsafe if the replacement would remove comments attached to the original expression.
 ///
 /// ## References
 /// - [Python documentation: `Path.read_bytes`](https://docs.python.org/3/library/pathlib.html#pathlib.Path.read_bytes)
@@ -42,12 +47,22 @@ pub(crate) struct ReadWholeFile {
 }
 
 impl Violation for ReadWholeFile {
+    const FIX_AVAILABILITY: FixAvailability = FixAvailability::Sometimes;
+
     #[derive_message_formats]
     fn message(&self) -> String {
         let filename = self.filename.truncated_display();
         let suggestion = self.suggestion.truncated_display();
         format!("`open` and `read` should be replaced by `Path({filename}).{suggestion}`")
     }
+
+    fn fix_title(&self) -> Option<String> {
+        Some(format!(
+            "Replace with `Path({}).{}`",
+            self.filename.truncated_display(),
+            self.suggestion.truncated_display(),
+        ))
+    }
 }
 
 /// FURB101
@@ -64,7 +79,7 @@ pub(crate) fn read_whole_file(checker: &Checker, with: &ast::StmtWith) {
     }
 
     // Then we need to match each `open` operation with exactly one `read` call.
-    let mut matcher = ReadMatcher::new(checker, candidates);
+    let mut matcher = ReadMatcher::new(checker, candidates, with);
     visitor::walk_body(&mut matcher, &with.body);
 }
 
@@ -72,13 +87,19 @@ pub(crate) fn read_whole_file(checker: &Checker, with: &ast::StmtWith) {
 struct ReadMatcher<'a, 'b> {
     checker: &'a Checker<'b>,
     candidates: Vec<FileOpen<'a>>,
+    with_stmt: &'a ast::StmtWith,
 }
 
 impl<'a, 'b> ReadMatcher<'a, 'b> {
-    fn new(checker: &'a Checker<'b>, candidates: Vec<FileOpen<'a>>) -> Self {
+    fn new(
+        checker: &'a Checker<'b>,
+        candidates: Vec<FileOpen<'a>>,
+        with_stmt: &'a ast::StmtWith,
+    ) -> Self {
         Self {
             checker,
             candidates,
+            with_stmt,
         }
     }
 }
@@ -92,15 +113,38 @@ impl<'a> Visitor<'a> for ReadMatcher<'a, '_> {
                 .position(|open| open.is_ref(read_from))
             {
                 let open = self.candidates.remove(open);
-                self.checker.report_diagnostic(
+                let suggestion = make_suggestion(&open, self.checker.generator());
+                let mut diagnostic = self.checker.report_diagnostic(
                     ReadWholeFile {
                         filename: SourceCodeSnippet::from_str(
                             &self.checker.generator().expr(open.filename),
                         ),
-                        suggestion: make_suggestion(&open, self.checker.generator()),
+                        suggestion: SourceCodeSnippet::from_str(&suggestion),
                     },
                     open.item.range(),
                 );
+
+                if !crate::preview::is_fix_read_whole_file_enabled(self.checker.settings()) {
+                    return;
+                }
+
+                let target = match self.with_stmt.body.first() {
+                    Some(Stmt::Assign(assign))
+                        if assign.value.range().contains_range(expr.range()) =>
+                    {
+                        match assign.targets.first() {
+                            Some(Expr::Name(name)) => Some(name.id.as_str()),
+                            _ => None,
+                        }
+                    }
+                    _ => None,
+                };
+
+                if let Some(fix) =
+                    generate_fix(self.checker, &open, target, self.with_stmt, &suggestion)
+                {
+                    diagnostic.set_fix(fix);
+                }
             }
             return;
         }
@@ -125,7 +169,7 @@ fn match_read_call(expr: &Expr) -> Option<&Expr> {
     Some(&*attr.value)
 }
 
-fn make_suggestion(open: &FileOpen<'_>, generator: Generator) -> SourceCodeSnippet {
+fn make_suggestion(open: &FileOpen<'_>, generator: Generator) -> String {
     let name = ast::ExprName {
         id: open.mode.pathlib_method(),
         ctx: ast::ExprContext::Load,
@@ -143,5 +187,46 @@ fn make_suggestion(open: &FileOpen<'_>, generator: Generator) -> SourceCodeSnipp
         range: TextRange::default(),
         node_index: ruff_python_ast::AtomicNodeIndex::NONE,
     };
-    SourceCodeSnippet::from_str(&generator.expr(&call.into()))
+    generator.expr(&call.into())
+}
+
+fn generate_fix(
+    checker: &Checker,
+    open: &FileOpen,
+    target: Option<&str>,
+    with_stmt: &ast::StmtWith,
+    suggestion: &str,
+) -> Option<Fix> {
+    if !(with_stmt.items.len() == 1 && matches!(with_stmt.body.as_slice(), [Stmt::Assign(_)])) {
+        return None;
+    }
+
+    let locator = checker.locator();
+    let filename_code = locator.slice(open.filename.range());
+
+    let (import_edit, binding) = checker
+        .importer()
+        .get_or_import_symbol(
+            &ImportRequest::import("pathlib", "Path"),
+            with_stmt.start(),
+            checker.semantic(),
+        )
+        .ok()?;
+
+    let replacement = match target {
+        Some(var) => format!("{var} = {binding}({filename_code}).{suggestion}"),
+        None => format!("{binding}({filename_code}).{suggestion}"),
+    };
+
+    let applicability = if checker.comment_ranges().intersects(with_stmt.range()) {
+        Applicability::Unsafe
+    } else {
+        Applicability::Safe
+    };
+
+    Some(Fix::applicable_edits(
+        Edit::range_replacement(replacement, with_stmt.range()),
+        [import_edit],
+        applicability,
+    ))
 }

crates/ruff_linter/src/rules/refurb/rules/write_whole_file.rs

@@ -1,15 +1,19 @@
+use ruff_diagnostics::{Applicability, Edit, Fix};
 use ruff_macros::{ViolationMetadata, derive_message_formats};
-use ruff_python_ast::relocate::relocate_expr;
-use ruff_python_ast::visitor::{self, Visitor};
-use ruff_python_ast::{self as ast, Expr, Stmt};
+use ruff_python_ast::{
+    self as ast, Expr, Stmt,
+    relocate::relocate_expr,
+    visitor::{self, Visitor},
+};
+
 use ruff_python_codegen::Generator;
 use ruff_text_size::{Ranged, TextRange};
 
-use crate::Violation;
 use crate::checkers::ast::Checker;
 use crate::fix::snippet::SourceCodeSnippet;
-
+use crate::importer::ImportRequest;
 use crate::rules::refurb::helpers::{FileOpen, find_file_opens};
+use crate::{FixAvailability, Violation};
 
 /// ## What it does
 /// Checks for uses of `open` and `write` that can be replaced by `pathlib`
@@ -33,6 +37,9 @@ use crate::rules::refurb::helpers::{FileOpen, find_file_opens};
 /// Path(filename).write_text(contents)
 /// ```
 ///
+/// ## Fix Safety
+/// This rule's fix is marked as unsafe if the replacement would remove comments attached to the original expression.
+///
 /// ## References
 /// - [Python documentation: `Path.write_bytes`](https://docs.python.org/3/library/pathlib.html#pathlib.Path.write_bytes)
 /// - [Python documentation: `Path.write_text`](https://docs.python.org/3/library/pathlib.html#pathlib.Path.write_text)
@@ -43,12 +50,21 @@ pub(crate) struct WriteWholeFile {
 }
 
 impl Violation for WriteWholeFile {
+    const FIX_AVAILABILITY: FixAvailability = FixAvailability::Sometimes;
+
     #[derive_message_formats]
     fn message(&self) -> String {
         let filename = self.filename.truncated_display();
         let suggestion = self.suggestion.truncated_display();
         format!("`open` and `write` should be replaced by `Path({filename}).{suggestion}`")
     }
+    fn fix_title(&self) -> Option<String> {
+        Some(format!(
+            "Replace with `Path({}).{}`",
+            self.filename.truncated_display(),
+            self.suggestion.truncated_display(),
+        ))
+    }
 }
 
 /// FURB103
@@ -65,7 +81,7 @@ pub(crate) fn write_whole_file(checker: &Checker, with: &ast::StmtWith) {
     }
 
     // Then we need to match each `open` operation with exactly one `write` call.
-    let mut matcher = WriteMatcher::new(checker, candidates);
+    let mut matcher = WriteMatcher::new(checker, candidates, with);
     visitor::walk_body(&mut matcher, &with.body);
 }
 
@@ -74,21 +90,27 @@ struct WriteMatcher<'a, 'b> {
     checker: &'a Checker<'b>,
     candidates: Vec<FileOpen<'a>>,
     loop_counter: u32,
+    with_stmt: &'a ast::StmtWith,
 }
 
 impl<'a, 'b> WriteMatcher<'a, 'b> {
-    fn new(checker: &'a Checker<'b>, candidates: Vec<FileOpen<'a>>) -> Self {
+    fn new(
+        checker: &'a Checker<'b>,
+        candidates: Vec<FileOpen<'a>>,
+        with_stmt: &'a ast::StmtWith,
+    ) -> Self {
         Self {
             checker,
             candidates,
             loop_counter: 0,
+            with_stmt,
         }
     }
 }
 
 impl<'a> Visitor<'a> for WriteMatcher<'a, '_> {
     fn visit_stmt(&mut self, stmt: &'a Stmt) {
-        if matches!(stmt, ast::Stmt::While(_) | ast::Stmt::For(_)) {
+        if matches!(stmt, Stmt::While(_) | Stmt::For(_)) {
             self.loop_counter += 1;
             visitor::walk_stmt(self, stmt);
             self.loop_counter -= 1;
@@ -104,19 +126,30 @@ impl<'a> Visitor<'a> for WriteMatcher<'a, '_> {
                 .iter()
                 .position(|open| open.is_ref(write_to))
             {
+                let open = self.candidates.remove(open);
+
                 if self.loop_counter == 0 {
-                    let open = self.candidates.remove(open);
-                    self.checker.report_diagnostic(
+                    let suggestion = make_suggestion(&open, content, self.checker.generator());
+
+                    let mut diagnostic = self.checker.report_diagnostic(
                         WriteWholeFile {
                             filename: SourceCodeSnippet::from_str(
                                 &self.checker.generator().expr(open.filename),
                             ),
-                            suggestion: make_suggestion(&open, content, self.checker.generator()),
+                            suggestion: SourceCodeSnippet::from_str(&suggestion),
                         },
                         open.item.range(),
                     );
-                } else {
-                    self.candidates.remove(open);
+
+                    if !crate::preview::is_fix_write_whole_file_enabled(self.checker.settings()) {
+                        return;
+                    }
+
+                    if let Some(fix) =
+                        generate_fix(self.checker, &open, self.with_stmt, &suggestion)
+                    {
+                        diagnostic.set_fix(fix);
+                    }
                 }
             }
             return;
@@ -143,7 +176,7 @@ fn match_write_call(expr: &Expr) -> Option<(&Expr, &Expr)> {
     Some((&*attr.value, call.arguments.args.first()?))
 }
 
-fn make_suggestion(open: &FileOpen<'_>, arg: &Expr, generator: Generator) -> SourceCodeSnippet {
+fn make_suggestion(open: &FileOpen<'_>, arg: &Expr, generator: Generator) -> String {
     let name = ast::ExprName {
         id: open.mode.pathlib_method(),
         ctx: ast::ExprContext::Load,
@@ -163,5 +196,42 @@ fn make_suggestion(open: &FileOpen<'_>, arg: &Expr, generator: Generator) -> Sou
         range: TextRange::default(),
         node_index: ruff_python_ast::AtomicNodeIndex::NONE,
     };
-    SourceCodeSnippet::from_str(&generator.expr(&call.into()))
+    generator.expr(&call.into())
+}
+
+fn generate_fix(
+    checker: &Checker,
+    open: &FileOpen,
+    with_stmt: &ast::StmtWith,
+    suggestion: &str,
+) -> Option<Fix> {
+    if !(with_stmt.items.len() == 1 && matches!(with_stmt.body.as_slice(), [Stmt::Expr(_)])) {
+        return None;
+    }
+
+    let locator = checker.locator();
+    let filename_code = locator.slice(open.filename.range());
+
+    let (import_edit, binding) = checker
+        .importer()
+        .get_or_import_symbol(
+            &ImportRequest::import("pathlib", "Path"),
+            with_stmt.start(),
+            checker.semantic(),
+        )
+        .ok()?;
+
+    let replacement = format!("{binding}({filename_code}).{suggestion}");
+
+    let applicability = if checker.comment_ranges().intersects(with_stmt.range()) {
+        Applicability::Unsafe
+    } else {
+        Applicability::Safe
+    };
+
+    Some(Fix::applicable_edits(
+        Edit::range_replacement(replacement, with_stmt.range()),
+        [import_edit],
+        applicability,
+    ))
 }

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__FURB101_FURB101.py.snap

@@ -9,6 +9,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
    |      ^^^^^^^^^^^^^^^^^^^^^
 13 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_text()`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
   --> FURB101.py:16:6
@@ -18,6 +19,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 17 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_bytes()`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
   --> FURB101.py:20:6
@@ -27,6 +29,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 21 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_bytes()`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text(encoding="utf8")`
   --> FURB101.py:24:6
@@ -36,6 +39,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text(enco
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 25 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_text(encoding="utf8")`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text(errors="ignore")`
   --> FURB101.py:28:6
@@ -45,6 +49,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text(erro
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 29 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_text(errors="ignore")`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
   --> FURB101.py:32:6
@@ -54,6 +59,7 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 33 |     x = f.read()
    |
+help: Replace with `Path("file.txt").read_text()`
 
 FURB101 `open` and `read` should be replaced by `Path(foo()).read_bytes()`
   --> FURB101.py:36:6
@@ -64,6 +70,7 @@ FURB101 `open` and `read` should be replaced by `Path(foo()).read_bytes()`
 37 |     # The body of `with` is non-trivial, but the recommendation holds.
 38 |     bar("pre")
    |
+help: Replace with `Path(foo()).read_bytes()`
 
 FURB101 `open` and `read` should be replaced by `Path("a.txt").read_text()`
   --> FURB101.py:44:6
@@ -74,6 +81,7 @@ FURB101 `open` and `read` should be replaced by `Path("a.txt").read_text()`
 45 |     x = a.read()
 46 |     y = b.read()
    |
+help: Replace with `Path("a.txt").read_text()`
 
 FURB101 `open` and `read` should be replaced by `Path("b.txt").read_bytes()`
   --> FURB101.py:44:26
@@ -84,6 +92,7 @@ FURB101 `open` and `read` should be replaced by `Path("b.txt").read_bytes()`
 45 |     x = a.read()
 46 |     y = b.read()
    |
+help: Replace with `Path("b.txt").read_bytes()`
 
 FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
   --> FURB101.py:49:18
@@ -94,3 +103,4 @@ FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
 50 |     # We have other things in here, multiple with items, but
 51 |     # the user reads the whole file and that bit they can replace.
    |
+help: Replace with `Path("file.txt").read_text()`

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__FURB103_FURB103.py.snap

@@ -9,6 +9,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text("t
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^
 13 |     f.write("test")
    |
+help: Replace with `Path("file.txt").write_text("test")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(foobar)`
   --> FURB103.py:16:6
@@ -18,6 +19,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(f
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 17 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_bytes(foobar)`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(b"abc")`
   --> FURB103.py:20:6
@@ -27,6 +29,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(b
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 21 |     f.write(b"abc")
    |
+help: Replace with `Path("file.txt").write_bytes(b"abc")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, encoding="utf8")`
   --> FURB103.py:24:6
@@ -36,6 +39,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 25 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, encoding="utf8")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, errors="ignore")`
   --> FURB103.py:28:6
@@ -45,6 +49,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 29 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, errors="ignore")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar)`
   --> FURB103.py:32:6
@@ -54,6 +59,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 33 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar)`
 
 FURB103 `open` and `write` should be replaced by `Path(foo()).write_bytes(bar())`
   --> FURB103.py:36:6
@@ -64,6 +70,7 @@ FURB103 `open` and `write` should be replaced by `Path(foo()).write_bytes(bar())
 37 |     # The body of `with` is non-trivial, but the recommendation holds.
 38 |     bar("pre")
    |
+help: Replace with `Path(foo()).write_bytes(bar())`
 
 FURB103 `open` and `write` should be replaced by `Path("a.txt").write_text(x)`
   --> FURB103.py:44:6
@@ -74,6 +81,7 @@ FURB103 `open` and `write` should be replaced by `Path("a.txt").write_text(x)`
 45 |     a.write(x)
 46 |     b.write(y)
    |
+help: Replace with `Path("a.txt").write_text(x)`
 
 FURB103 `open` and `write` should be replaced by `Path("b.txt").write_bytes(y)`
   --> FURB103.py:44:31
@@ -84,6 +92,7 @@ FURB103 `open` and `write` should be replaced by `Path("b.txt").write_bytes(y)`
 45 |     a.write(x)
 46 |     b.write(y)
    |
+help: Replace with `Path("b.txt").write_bytes(y)`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(bar(bar(a + x)))`
   --> FURB103.py:49:18
@@ -94,6 +103,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(ba
 50 |     # We have other things in here, multiple with items, but the user
 51 |     # writes a single time to file and that bit they can replace.
    |
+help: Replace with `Path("file.txt").write_text(bar(bar(a + x)))`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
   --> FURB103.py:58:6
@@ -103,6 +113,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 59 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
   --> FURB103.py:66:6
@@ -112,6 +123,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 67 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
   --> FURB103.py:74:6
@@ -121,3 +133,4 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 75 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__preview_FURB101_FURB101.py.snap

@@ -0,0 +1,191 @@
+---
+source: crates/ruff_linter/src/rules/refurb/mod.rs
+---
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_text()`
+  --> FURB101.py:12:6
+   |
+11 | # FURB101
+12 | with open("file.txt") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^
+13 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_text()`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+10 | # Errors.
+11 | 
+12 | # FURB101
+   - with open("file.txt") as f:
+   -     x = f.read()
+13 + x = pathlib.Path("file.txt").read_text()
+14 | 
+15 | # FURB101
+16 | with open("file.txt", "rb") as f:
+
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
+  --> FURB101.py:16:6
+   |
+15 | # FURB101
+16 | with open("file.txt", "rb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+17 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_bytes()`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+14 |     x = f.read()
+15 | 
+16 | # FURB101
+   - with open("file.txt", "rb") as f:
+   -     x = f.read()
+17 + x = pathlib.Path("file.txt").read_bytes()
+18 | 
+19 | # FURB101
+20 | with open("file.txt", mode="rb") as f:
+
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_bytes()`
+  --> FURB101.py:20:6
+   |
+19 | # FURB101
+20 | with open("file.txt", mode="rb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+21 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_bytes()`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+18 |     x = f.read()
+19 | 
+20 | # FURB101
+   - with open("file.txt", mode="rb") as f:
+   -     x = f.read()
+21 + x = pathlib.Path("file.txt").read_bytes()
+22 | 
+23 | # FURB101
+24 | with open("file.txt", encoding="utf8") as f:
+
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_text(encoding="utf8")`
+  --> FURB101.py:24:6
+   |
+23 | # FURB101
+24 | with open("file.txt", encoding="utf8") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+25 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_text(encoding="utf8")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+22 |     x = f.read()
+23 | 
+24 | # FURB101
+   - with open("file.txt", encoding="utf8") as f:
+   -     x = f.read()
+25 + x = pathlib.Path("file.txt").read_text(encoding="utf8")
+26 | 
+27 | # FURB101
+28 | with open("file.txt", errors="ignore") as f:
+
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_text(errors="ignore")`
+  --> FURB101.py:28:6
+   |
+27 | # FURB101
+28 | with open("file.txt", errors="ignore") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+29 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_text(errors="ignore")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+26 |     x = f.read()
+27 | 
+28 | # FURB101
+   - with open("file.txt", errors="ignore") as f:
+   -     x = f.read()
+29 + x = pathlib.Path("file.txt").read_text(errors="ignore")
+30 | 
+31 | # FURB101
+32 | with open("file.txt", mode="r") as f:  # noqa: FURB120
+
+FURB101 [*] `open` and `read` should be replaced by `Path("file.txt").read_text()`
+  --> FURB101.py:32:6
+   |
+31 | # FURB101
+32 | with open("file.txt", mode="r") as f:  # noqa: FURB120
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+33 |     x = f.read()
+   |
+help: Replace with `Path("file.txt").read_text()`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+30 |     x = f.read()
+31 | 
+32 | # FURB101
+   - with open("file.txt", mode="r") as f:  # noqa: FURB120
+   -     x = f.read()
+33 + x = pathlib.Path("file.txt").read_text()
+34 | 
+35 | # FURB101
+36 | with open(foo(), "rb") as f:
+note: This is an unsafe fix and may change runtime behavior
+
+FURB101 `open` and `read` should be replaced by `Path(foo()).read_bytes()`
+  --> FURB101.py:36:6
+   |
+35 | # FURB101
+36 | with open(foo(), "rb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^
+37 |     # The body of `with` is non-trivial, but the recommendation holds.
+38 |     bar("pre")
+   |
+help: Replace with `Path(foo()).read_bytes()`
+
+FURB101 `open` and `read` should be replaced by `Path("a.txt").read_text()`
+  --> FURB101.py:44:6
+   |
+43 | # FURB101
+44 | with open("a.txt") as a, open("b.txt", "rb") as b:
+   |      ^^^^^^^^^^^^^^^^^^
+45 |     x = a.read()
+46 |     y = b.read()
+   |
+help: Replace with `Path("a.txt").read_text()`
+
+FURB101 `open` and `read` should be replaced by `Path("b.txt").read_bytes()`
+  --> FURB101.py:44:26
+   |
+43 | # FURB101
+44 | with open("a.txt") as a, open("b.txt", "rb") as b:
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^
+45 |     x = a.read()
+46 |     y = b.read()
+   |
+help: Replace with `Path("b.txt").read_bytes()`
+
+FURB101 `open` and `read` should be replaced by `Path("file.txt").read_text()`
+  --> FURB101.py:49:18
+   |
+48 | # FURB101
+49 | with foo() as a, open("file.txt") as b, foo() as c:
+   |                  ^^^^^^^^^^^^^^^^^^^^^
+50 |     # We have other things in here, multiple with items, but
+51 |     # the user reads the whole file and that bit they can replace.
+   |
+help: Replace with `Path("file.txt").read_text()`

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__preview_FURB103_FURB103.py.snap

@@ -0,0 +1,260 @@
+---
+source: crates/ruff_linter/src/rules/refurb/mod.rs
+---
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text("test")`
+  --> FURB103.py:12:6
+   |
+11 | # FURB103
+12 | with open("file.txt", "w") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+13 |     f.write("test")
+   |
+help: Replace with `Path("file.txt").write_text("test")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+10 | # Errors.
+11 | 
+12 | # FURB103
+   - with open("file.txt", "w") as f:
+   -     f.write("test")
+13 + pathlib.Path("file.txt").write_text("test")
+14 | 
+15 | # FURB103
+16 | with open("file.txt", "wb") as f:
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_bytes(foobar)`
+  --> FURB103.py:16:6
+   |
+15 | # FURB103
+16 | with open("file.txt", "wb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+17 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_bytes(foobar)`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+14 |     f.write("test")
+15 | 
+16 | # FURB103
+   - with open("file.txt", "wb") as f:
+   -     f.write(foobar)
+17 + pathlib.Path("file.txt").write_bytes(foobar)
+18 | 
+19 | # FURB103
+20 | with open("file.txt", mode="wb") as f:
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_bytes(b"abc")`
+  --> FURB103.py:20:6
+   |
+19 | # FURB103
+20 | with open("file.txt", mode="wb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+21 |     f.write(b"abc")
+   |
+help: Replace with `Path("file.txt").write_bytes(b"abc")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+18 |     f.write(foobar)
+19 | 
+20 | # FURB103
+   - with open("file.txt", mode="wb") as f:
+   -     f.write(b"abc")
+21 + pathlib.Path("file.txt").write_bytes(b"abc")
+22 | 
+23 | # FURB103
+24 | with open("file.txt", "w", encoding="utf8") as f:
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, encoding="utf8")`
+  --> FURB103.py:24:6
+   |
+23 | # FURB103
+24 | with open("file.txt", "w", encoding="utf8") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+25 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar, encoding="utf8")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+22 |     f.write(b"abc")
+23 | 
+24 | # FURB103
+   - with open("file.txt", "w", encoding="utf8") as f:
+   -     f.write(foobar)
+25 + pathlib.Path("file.txt").write_text(foobar, encoding="utf8")
+26 | 
+27 | # FURB103
+28 | with open("file.txt", "w", errors="ignore") as f:
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, errors="ignore")`
+  --> FURB103.py:28:6
+   |
+27 | # FURB103
+28 | with open("file.txt", "w", errors="ignore") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+29 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar, errors="ignore")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+26 |     f.write(foobar)
+27 | 
+28 | # FURB103
+   - with open("file.txt", "w", errors="ignore") as f:
+   -     f.write(foobar)
+29 + pathlib.Path("file.txt").write_text(foobar, errors="ignore")
+30 | 
+31 | # FURB103
+32 | with open("file.txt", mode="w") as f:
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar)`
+  --> FURB103.py:32:6
+   |
+31 | # FURB103
+32 | with open("file.txt", mode="w") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+33 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar)`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+30 |     f.write(foobar)
+31 | 
+32 | # FURB103
+   - with open("file.txt", mode="w") as f:
+   -     f.write(foobar)
+33 + pathlib.Path("file.txt").write_text(foobar)
+34 | 
+35 | # FURB103
+36 | with open(foo(), "wb") as f:
+
+FURB103 `open` and `write` should be replaced by `Path(foo()).write_bytes(bar())`
+  --> FURB103.py:36:6
+   |
+35 | # FURB103
+36 | with open(foo(), "wb") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^
+37 |     # The body of `with` is non-trivial, but the recommendation holds.
+38 |     bar("pre")
+   |
+help: Replace with `Path(foo()).write_bytes(bar())`
+
+FURB103 `open` and `write` should be replaced by `Path("a.txt").write_text(x)`
+  --> FURB103.py:44:6
+   |
+43 | # FURB103
+44 | with open("a.txt", "w") as a, open("b.txt", "wb") as b:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^
+45 |     a.write(x)
+46 |     b.write(y)
+   |
+help: Replace with `Path("a.txt").write_text(x)`
+
+FURB103 `open` and `write` should be replaced by `Path("b.txt").write_bytes(y)`
+  --> FURB103.py:44:31
+   |
+43 | # FURB103
+44 | with open("a.txt", "w") as a, open("b.txt", "wb") as b:
+   |                               ^^^^^^^^^^^^^^^^^^^^^^^^
+45 |     a.write(x)
+46 |     b.write(y)
+   |
+help: Replace with `Path("b.txt").write_bytes(y)`
+
+FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(bar(bar(a + x)))`
+  --> FURB103.py:49:18
+   |
+48 | # FURB103
+49 | with foo() as a, open("file.txt", "w") as b, foo() as c:
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
+50 |     # We have other things in here, multiple with items, but the user
+51 |     # writes a single time to file and that bit they can replace.
+   |
+help: Replace with `Path("file.txt").write_text(bar(bar(a + x)))`
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
+  --> FURB103.py:58:6
+   |
+57 | # FURB103
+58 | with open("file.txt", "w", newline="\r\n") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+59 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`
+1  + import pathlib
+2  | def foo():
+3  |     ...
+4  | 
+--------------------------------------------------------------------------------
+56 | 
+57 | 
+58 | # FURB103
+   - with open("file.txt", "w", newline="\r\n") as f:
+   -     f.write(foobar)
+59 + pathlib.Path("file.txt").write_text(foobar, newline="\r\n")
+60 | 
+61 | 
+62 | import builtins
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
+  --> FURB103.py:66:6
+   |
+65 | # FURB103
+66 | with builtins.open("file.txt", "w", newline="\r\n") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+67 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`
+60 | 
+61 | 
+62 | import builtins
+63 + import pathlib
+64 | 
+65 | 
+66 | # FURB103
+   - with builtins.open("file.txt", "w", newline="\r\n") as f:
+   -     f.write(foobar)
+67 + pathlib.Path("file.txt").write_text(foobar, newline="\r\n")
+68 | 
+69 | 
+70 | from builtins import open as o
+
+FURB103 [*] `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, newline="\r\n")`
+  --> FURB103.py:74:6
+   |
+73 | # FURB103
+74 | with o("file.txt", "w", newline="\r\n") as f:
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+75 |     f.write(foobar)
+   |
+help: Replace with `Path("file.txt").write_text(foobar, newline="\r\n")`
+68 | 
+69 | 
+70 | from builtins import open as o
+71 + import pathlib
+72 | 
+73 | 
+74 | # FURB103
+   - with o("file.txt", "w", newline="\r\n") as f:
+   -     f.write(foobar)
+75 + pathlib.Path("file.txt").write_text(foobar, newline="\r\n")
+76 | 
+77 | # Non-errors.
+78 |

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__write_whole_file_python_39.snap

@@ -9,6 +9,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text("t
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^
 13 |     f.write("test")
    |
+help: Replace with `Path("file.txt").write_text("test")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(foobar)`
   --> FURB103.py:16:6
@@ -18,6 +19,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(f
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 17 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_bytes(foobar)`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(b"abc")`
   --> FURB103.py:20:6
@@ -27,6 +29,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_bytes(b
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 21 |     f.write(b"abc")
    |
+help: Replace with `Path("file.txt").write_bytes(b"abc")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, encoding="utf8")`
   --> FURB103.py:24:6
@@ -36,6 +39,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 25 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, encoding="utf8")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar, errors="ignore")`
   --> FURB103.py:28:6
@@ -45,6 +49,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 29 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar, errors="ignore")`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(foobar)`
   --> FURB103.py:32:6
@@ -54,6 +59,7 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(fo
    |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 33 |     f.write(foobar)
    |
+help: Replace with `Path("file.txt").write_text(foobar)`
 
 FURB103 `open` and `write` should be replaced by `Path(foo()).write_bytes(bar())`
   --> FURB103.py:36:6
@@ -64,6 +70,7 @@ FURB103 `open` and `write` should be replaced by `Path(foo()).write_bytes(bar())
 37 |     # The body of `with` is non-trivial, but the recommendation holds.
 38 |     bar("pre")
    |
+help: Replace with `Path(foo()).write_bytes(bar())`
 
 FURB103 `open` and `write` should be replaced by `Path("a.txt").write_text(x)`
   --> FURB103.py:44:6
@@ -74,6 +81,7 @@ FURB103 `open` and `write` should be replaced by `Path("a.txt").write_text(x)`
 45 |     a.write(x)
 46 |     b.write(y)
    |
+help: Replace with `Path("a.txt").write_text(x)`
 
 FURB103 `open` and `write` should be replaced by `Path("b.txt").write_bytes(y)`
   --> FURB103.py:44:31
@@ -84,6 +92,7 @@ FURB103 `open` and `write` should be replaced by `Path("b.txt").write_bytes(y)`
 45 |     a.write(x)
 46 |     b.write(y)
    |
+help: Replace with `Path("b.txt").write_bytes(y)`
 
 FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(bar(bar(a + x)))`
   --> FURB103.py:49:18
@@ -94,3 +103,4 @@ FURB103 `open` and `write` should be replaced by `Path("file.txt").write_text(ba
 50 |     # We have other things in here, multiple with items, but the user
 51 |     # writes a single time to file and that bit they can replace.
    |
+help: Replace with `Path("file.txt").write_text(bar(bar(a + x)))`