Implement pylint too-many-lines (C0302)

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_extend_from_shared_config.snap

@@ -259,6 +259,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool.snap

@@ -261,6 +261,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool_preview_enabled.snap

@@ -263,6 +263,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_no_tool_target_version_override.snap

@@ -263,6 +263,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_pyproject_toml_above.snap

@@ -260,6 +260,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_pyproject_toml_above_with_tool.snap

@@ -260,6 +260,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_above-2.snap

@@ -259,6 +259,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_above.snap

@@ -259,6 +259,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/cli/snapshots/cli__lint__requires_python_ruff_toml_no_target_fallback.snap

@@ -259,6 +259,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff/tests/snapshots/show_settings__display_default_settings.snap

@@ -372,6 +372,7 @@ linter.pylint.max_statements = 50
 linter.pylint.max_public_methods = 20
 linter.pylint.max_locals = 15
 linter.pylint.max_nested_blocks = 5
+linter.pylint.max_module_lines = 1000
 linter.pyupgrade.keep_runtime_typing = false
 linter.ruff.parenthesize_tuple_in_subscript = false
 

crates/ruff_linter/src/checkers/physical_lines.rs

@@ -78,6 +78,10 @@ pub(crate) fn check_physical_lines(
     if enforce_copyright_notice {
         missing_copyright_notice(locator, settings, context);
     }
+
+    if context.is_rule_enabled(Rule::TooManyLines) {
+        pylint::rules::too_many_lines(locator, settings, context);
+    }
 }
 
 #[cfg(test)]

crates/ruff_linter/src/codes.rs

@@ -221,6 +221,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Pylint, "C0206") => rules::pylint::rules::DictIndexMissingItems,
         (Pylint, "C0207") => rules::pylint::rules::MissingMaxsplitArg,
         (Pylint, "C0208") => rules::pylint::rules::IterationOverSet,
+        (Pylint, "C0302") => rules::pylint::rules::TooManyLines,
         (Pylint, "C0414") => rules::pylint::rules::UselessImportAlias,
         (Pylint, "C0415") => rules::pylint::rules::ImportOutsideTopLevel,
         (Pylint, "C1802") => rules::pylint::rules::LenTest,

crates/ruff_linter/src/registry.rs

@@ -259,6 +259,7 @@ impl Rule {
             | Rule::MissingCopyrightNotice
             | Rule::MissingNewlineAtEndOfFile
             | Rule::MixedSpacesAndTabs
+            | Rule::TooManyLines
             | Rule::TrailingWhitespace => LintSource::PhysicalLines,
             Rule::AmbiguousUnicodeCharacterComment
             | Rule::BlanketTypeIgnore

crates/ruff_linter/src/rules/flake8_lineleak/settings.rs

@@ -0,0 +1,33 @@
+//! Settings for the `flake8-lineleak` plugin.
+
+use std::fmt::{Display, Formatter};
+
+use ruff_macros::CacheKey;
+
+use crate::display_settings;
+
+#[derive(Debug, Clone, CacheKey)]
+pub struct Settings {
+    pub max_line_count: usize,
+}
+
+impl Default for Settings {
+    fn default() -> Self {
+        Self {
+            max_line_count: 100,
+        }
+    }
+}
+
+impl Display for Settings {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        display_settings! {
+            formatter = f,
+            namespace = "linter.flake8_lineleak",
+            fields = [
+                self.max_line_count,
+            ]
+        }
+        Ok(())
+    }
+}

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

@@ -444,4 +444,90 @@ mod tests {
         assert_diagnostics!(diagnostics);
         Ok(())
     }
+
+    #[test]
+    fn too_many_lines_below_limit() {
+        use crate::test::test_snippet;
+
+        let diagnostics = test_snippet(
+            r"
+# Line 1
+# Line 2
+# Line 3
+import os
+"
+            .trim(),
+            &LinterSettings {
+                preview: PreviewMode::Enabled,
+                pylint: pylint::settings::Settings {
+                    max_module_lines: 1000,
+                    ..pylint::settings::Settings::default()
+                },
+                ..LinterSettings::for_rules(vec![Rule::TooManyLines])
+            },
+        );
+        assert_diagnostics!(diagnostics);
+    }
+
+    #[test]
+    fn too_many_lines_exceeds_limit() {
+        use crate::test::test_snippet;
+
+        let diagnostics = test_snippet(
+            r"
+# Line 1
+# Line 2
+# Line 3
+# Line 4
+# Line 5
+# Line 6
+# Line 7
+# Line 8
+# Line 9
+# Line 10
+# Line 11
+import os
+"
+            .trim(),
+            &LinterSettings {
+                preview: PreviewMode::Enabled,
+                pylint: pylint::settings::Settings {
+                    max_module_lines: 10,
+                    ..pylint::settings::Settings::default()
+                },
+                ..LinterSettings::for_rules(vec![Rule::TooManyLines])
+            },
+        );
+        assert!(!diagnostics.is_empty());
+    }
+
+    #[test]
+    fn too_many_lines_at_limit() {
+        use crate::test::test_snippet;
+
+        let diagnostics = test_snippet(
+            r"
+# Line 1
+# Line 2
+# Line 3
+# Line 4
+# Line 5
+# Line 6
+# Line 7
+# Line 8
+# Line 9
+# Line 10
+"
+            .trim(),
+            &LinterSettings {
+                preview: PreviewMode::Enabled,
+                pylint: pylint::settings::Settings {
+                    max_module_lines: 10,
+                    ..pylint::settings::Settings::default()
+                },
+                ..LinterSettings::for_rules(vec![Rule::TooManyLines])
+            },
+        );
+        assert_diagnostics!(diagnostics);
+    }
 }

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

@@ -83,6 +83,7 @@ pub(crate) use sys_exit_alias::*;
 pub(crate) use too_many_arguments::*;
 pub(crate) use too_many_boolean_expressions::*;
 pub(crate) use too_many_branches::*;
+pub(crate) use too_many_lines::*;
 pub(crate) use too_many_locals::*;
 pub(crate) use too_many_nested_blocks::*;
 pub(crate) use too_many_positional_arguments::*;
@@ -194,6 +195,7 @@ mod sys_exit_alias;
 mod too_many_arguments;
 mod too_many_boolean_expressions;
 mod too_many_branches;
+mod too_many_lines;
 mod too_many_locals;
 mod too_many_nested_blocks;
 mod too_many_positional_arguments;

crates/ruff_linter/src/rules/pylint/rules/too_many_lines.rs

@@ -0,0 +1,58 @@
+use ruff_macros::{ViolationMetadata, derive_message_formats};
+use ruff_text_size::TextRange;
+
+use crate::Locator;
+use crate::Violation;
+use crate::checkers::ast::LintContext;
+use crate::settings::LinterSettings;
+
+/// ## What it does
+/// Checks for modules with too many lines.
+///
+/// By default, this rule allows up to 1000 lines, as configured by the
+/// [`lint.pylint.max-module-lines`] option.
+///
+/// ## Why is this bad?
+/// Modules with many lines are generally harder to read and understand.
+/// Extracting functionality into separate modules can improve code organization
+/// and maintainability.
+///
+/// ## Example
+/// A module with 1500 lines when `max-module-lines` is set to 1000 will trigger
+/// this rule.
+///
+/// ## Options
+/// - `lint.pylint.max-module-lines`
+#[derive(ViolationMetadata)]
+#[violation_metadata(preview_since = "v0.14.9")]
+pub(crate) struct TooManyLines {
+    actual_lines: usize,
+    max_lines: usize,
+}
+
+impl Violation for TooManyLines {
+    #[derive_message_formats]
+    fn message(&self) -> String {
+        let TooManyLines {
+            actual_lines,
+            max_lines,
+        } = self;
+        format!("Too many lines in module ({actual_lines}/{max_lines})")
+    }
+}
+
+/// C0302
+pub(crate) fn too_many_lines(locator: &Locator, settings: &LinterSettings, context: &LintContext) {
+    let actual_lines = locator.contents().lines().count();
+    let max_lines = settings.pylint.max_module_lines;
+
+    if actual_lines > max_lines {
+        context.report_diagnostic(
+            TooManyLines {
+                actual_lines,
+                max_lines,
+            },
+            TextRange::default(),
+        );
+    }
+}

crates/ruff_linter/src/rules/pylint/settings.rs

@@ -61,6 +61,7 @@ pub struct Settings {
     pub max_public_methods: usize,
     pub max_locals: usize,
     pub max_nested_blocks: usize,
+    pub max_module_lines: usize,
 }
 
 impl Default for Settings {
@@ -77,6 +78,7 @@ impl Default for Settings {
             max_public_methods: 20,
             max_locals: 15,
             max_nested_blocks: 5,
+            max_module_lines: 1000,
         }
     }
 }
@@ -97,7 +99,8 @@ impl fmt::Display for Settings {
                 self.max_statements,
                 self.max_public_methods,
                 self.max_locals,
-                self.max_nested_blocks
+                self.max_nested_blocks,
+                self.max_module_lines
             ]
         }
         Ok(())

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__too_many_lines_at_limit.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff_linter/src/rules/pylint/mod.rs
+---
+

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__too_many_lines_below_limit.snap

@@ -0,0 +1,4 @@
+---
+source: crates/ruff_linter/src/rules/pylint/mod.rs
+---
+

crates/ruff_workspace/src/options.rs

@@ -3343,6 +3343,14 @@ pub struct PylintOptions {
         example = r"max-nested-blocks = 10"
     )]
     pub max_nested_blocks: Option<usize>,
+
+    /// Maximum number of lines allowed in a module (see `PLC0302`).
+    #[option(
+        default = r"1000",
+        value_type = "int",
+        example = r"max-module-lines = 1500"
+    )]
+    pub max_module_lines: Option<usize>,
 }
 
 impl PylintOptions {
@@ -3367,6 +3375,7 @@ impl PylintOptions {
                 .unwrap_or(defaults.max_public_methods),
             max_locals: self.max_locals.unwrap_or(defaults.max_locals),
             max_nested_blocks: self.max_nested_blocks.unwrap_or(defaults.max_nested_blocks),
+            max_module_lines: self.max_module_lines.unwrap_or(defaults.max_module_lines),
         }
     }
 }

ruff.schema.json

@@ -2794,6 +2794,15 @@
           "format": "uint",
           "minimum": 0
         },
+        "max-module-lines": {
+          "description": "Maximum number of lines allowed in a module (see `PLC0302`).",
+          "type": [
+            "integer",
+            "null"
+          ],
+          "format": "uint",
+          "minimum": 0
+        },
         "max-nested-blocks": {
           "description": "Maximum number of nested blocks allowed within a function or method body\n(see `PLR1702`).",
           "type": [
@@ -3590,6 +3599,9 @@
         "PLC0206",
         "PLC0207",
         "PLC0208",
+        "PLC03",
+        "PLC030",
+        "PLC0302",
         "PLC04",
         "PLC041",
         "PLC0414",