Fix some &String, &Option, and &Vec usages (#1670)

src/ast/helpers.rs

@@ -316,7 +316,7 @@ pub fn is_super_call_with_arguments(func: &Expr, args: &[Expr]) -> bool {
 }
 
 /// Format the module name for a relative import.
-pub fn format_import_from(level: Option<&usize>, module: Option<&String>) -> String {
+pub fn format_import_from(level: Option<&usize>, module: Option<&str>) -> String {
     let mut module_name = String::with_capacity(16);
     if let Some(level) = level {
         for _ in 0..*level {

src/checkers/ast.rs

@@ -926,9 +926,11 @@ where
                 }
 
                 if self.settings.enabled.contains(&CheckCode::PT013) {
-                    if let Some(check) =
-                        flake8_pytest_style::plugins::import_from(stmt, module, level)
-                    {
+                    if let Some(check) = flake8_pytest_style::plugins::import_from(
+                        stmt,
+                        module.as_ref().map(String::as_str),
+                        level.as_ref(),
+                    ) {
                         self.add_check(check);
                     }
                 }
@@ -992,7 +994,7 @@ where
                                 self.add_check(Check::new(
                                     CheckKind::ImportStarNotPermitted(helpers::format_import_from(
                                         level.as_ref(),
-                                        module.as_ref(),
+                                        module.as_ref().map(String::as_str),
                                     )),
                                     Range::from_located(stmt),
                                 ));
@@ -1003,7 +1005,7 @@ where
                             self.add_check(Check::new(
                                 CheckKind::ImportStarUsed(helpers::format_import_from(
                                     level.as_ref(),
-                                    module.as_ref(),
+                                    module.as_ref().map(String::as_str),
                                 )),
                                 Range::from_located(stmt),
                             ));
@@ -2577,7 +2579,11 @@ where
                     }
                 }
                 if self.settings.enabled.contains(&CheckCode::UP025) {
-                    pyupgrade::plugins::rewrite_unicode_literal(self, expr, kind);
+                    pyupgrade::plugins::rewrite_unicode_literal(
+                        self,
+                        expr,
+                        kind.as_ref().map(String::as_str),
+                    );
                 }
             }
             ExprKind::Lambda { args, body, .. } => {
@@ -3376,7 +3382,7 @@ impl<'a> Checker<'a> {
                             if let BindingKind::StarImportation(level, module) = &binding.kind {
                                 from_list.push(helpers::format_import_from(
                                     level.as_ref(),
-                                    module.as_ref(),
+                                    module.as_ref().map(String::as_str),
                                 ));
                             }
                         }
@@ -3857,7 +3863,7 @@ impl<'a> Checker<'a> {
                                 if let BindingKind::StarImportation(level, module) = &binding.kind {
                                     from_list.push(helpers::format_import_from(
                                         level.as_ref(),
-                                        module.as_ref(),
+                                        module.as_ref().map(String::as_str),
                                     ));
                                 }
                             }
@@ -3882,7 +3888,7 @@ impl<'a> Checker<'a> {
             if self.settings.enabled.contains(&CheckCode::F401) {
                 // Collect all unused imports by location. (Multiple unused imports at the same
                 // location indicates an `import from`.)
-                type UnusedImport<'a> = (&'a String, &'a Range);
+                type UnusedImport<'a> = (&'a str, &'a Range);
                 type BindingContext<'a, 'b> =
                     (&'a RefEquality<'b, Stmt>, Option<&'a RefEquality<'b, Stmt>>);
 
@@ -3954,9 +3960,7 @@ impl<'a> Checker<'a> {
                         let deleted: Vec<&Stmt> =
                             self.deletions.iter().map(|node| node.0).collect();
                         match autofix::helpers::remove_unused_imports(
-                            unused_imports
-                                .iter()
-                                .map(|(full_name, _)| full_name.as_str()),
+                            unused_imports.iter().map(|(full_name, _)| *full_name),
                             child,
                             parent,
                             &deleted,
@@ -4002,7 +4006,7 @@ impl<'a> Checker<'a> {
                     let multiple = unused_imports.len() > 1;
                     for (full_name, range) in unused_imports {
                         let mut check = Check::new(
-                            CheckKind::UnusedImport(full_name.clone(), ignore_init, multiple),
+                            CheckKind::UnusedImport(full_name.to_string(), ignore_init, multiple),
                             *range,
                         );
                         if matches!(child.node, StmtKind::ImportFrom { .. })

src/flake8_bandit/checks/hardcoded_password_string.rs

@@ -42,7 +42,7 @@ pub fn compare_to_hardcoded_password_string(left: &Expr, comparators: &[Expr]) -
 }
 
 /// S105
-pub fn assign_hardcoded_password_string(value: &Expr, targets: &Vec<Expr>) -> Option<Check> {
+pub fn assign_hardcoded_password_string(value: &Expr, targets: &[Expr]) -> Option<Check> {
     if let Some(string) = string_literal(value) {
         for target in targets {
             if is_password_target(target) {

src/flake8_pytest_style/plugins/imports.rs

@@ -25,8 +25,8 @@ pub fn import(import_from: &Stmt, name: &str, asname: Option<&str>) -> Option<Ch
 /// PT013
 pub fn import_from(
     import_from: &Stmt,
-    module: &Option<String>,
-    level: &Option<usize>,
+    module: Option<&str>,
+    level: Option<&usize>,
 ) -> Option<Check> {
     // If level is not zero or module is none, return
     if let Some(level) = level {

src/flake8_pytest_style/plugins/raises.rs

@@ -18,7 +18,7 @@ fn is_pytest_raises(
     match_module_member(func, "pytest", "raises", from_imports, import_aliases)
 }
 
-fn is_non_trivial_with_body(body: &Vec<Stmt>) -> bool {
+fn is_non_trivial_with_body(body: &[Stmt]) -> bool {
     if body.len() > 1 {
         true
     } else if let Some(first_body_stmt) = body.first() {
@@ -28,7 +28,7 @@ fn is_non_trivial_with_body(body: &Vec<Stmt>) -> bool {
     }
 }
 
-pub fn raises_call(checker: &mut Checker, func: &Expr, args: &Vec<Expr>, keywords: &Vec<Keyword>) {
+pub fn raises_call(checker: &mut Checker, func: &Expr, args: &[Expr], keywords: &[Keyword]) {
     if is_pytest_raises(func, &checker.from_imports, &checker.import_aliases) {
         if checker.settings.enabled.contains(&CheckCode::PT010) {
             if args.is_empty() && keywords.is_empty() {
@@ -57,7 +57,7 @@ pub fn raises_call(checker: &mut Checker, func: &Expr, args: &Vec<Expr>, keyword
     }
 }
 
-pub fn complex_raises(checker: &mut Checker, stmt: &Stmt, items: &[Withitem], body: &Vec<Stmt>) {
+pub fn complex_raises(checker: &mut Checker, stmt: &Stmt, items: &[Withitem], body: &[Stmt]) {
     let mut is_too_complex = false;
 
     let raises_called = items.iter().any(|item| match &item.context_expr.node {

src/flake8_return/visitor.rs

@@ -62,7 +62,7 @@ impl<'a> Visitor<'a> for ReturnVisitor<'a> {
             StmtKind::Global { names } | StmtKind::Nonlocal { names } => {
                 self.stack
                     .non_locals
-                    .extend(names.iter().map(std::string::String::as_str));
+                    .extend(names.iter().map(String::as_str));
             }
             StmtKind::FunctionDef { .. } | StmtKind::AsyncFunctionDef { .. } => {
                 // Don't recurse.

src/isort/mod.rs

@@ -33,7 +33,7 @@ pub mod types;
 #[derive(Debug)]
 pub struct AnnotatedAliasData<'a> {
     pub name: &'a str,
-    pub asname: Option<&'a String>,
+    pub asname: Option<&'a str>,
     pub atop: Vec<Comment<'a>>,
     pub inline: Vec<Comment<'a>>,
 }
@@ -87,7 +87,7 @@ fn annotate_imports<'a>(
                         .iter()
                         .map(|alias| AliasData {
                             name: &alias.node.name,
-                            asname: alias.node.asname.as_ref(),
+                            asname: alias.node.asname.as_deref(),
                         })
                         .collect(),
                     atop,
@@ -145,7 +145,7 @@ fn annotate_imports<'a>(
 
                     aliases.push(AnnotatedAliasData {
                         name: &alias.node.name,
-                        asname: alias.node.asname.as_ref(),
+                        asname: alias.node.asname.as_deref(),
                         atop: alias_atop,
                         inline: alias_inline,
                     });
@@ -219,19 +219,28 @@ fn normalize_imports(imports: Vec<AnnotatedImport>, combine_as_imports: bool) ->
                     let entry = if alias.name == "*" {
                         block
                             .import_from_star
-                            .entry(ImportFromData { module, level })
+                            .entry(ImportFromData {
+                                module: module.map(String::as_str),
+                                level,
+                            })
                             .or_default()
                     } else if alias.asname.is_none() || combine_as_imports {
                         &mut block
                             .import_from
-                            .entry(ImportFromData { module, level })
+                            .entry(ImportFromData {
+                                module: module.map(String::as_str),
+                                level,
+                            })
                             .or_default()
                             .0
                     } else {
                         block
                             .import_from_as
                             .entry((
-                                ImportFromData { module, level },
+                                ImportFromData {
+                                    module: module.map(String::as_str),
+                                    level,
+                                },
                                 AliasData {
                                     name: alias.name,
                                     asname: alias.asname,
@@ -254,12 +263,18 @@ fn normalize_imports(imports: Vec<AnnotatedImport>, combine_as_imports: bool) ->
                     let entry = if alias.name == "*" {
                         block
                             .import_from_star
-                            .entry(ImportFromData { module, level })
+                            .entry(ImportFromData {
+                                module: module.map(String::as_str),
+                                level,
+                            })
                             .or_default()
                     } else if alias.asname.is_none() || combine_as_imports {
                         block
                             .import_from
-                            .entry(ImportFromData { module, level })
+                            .entry(ImportFromData {
+                                module: module.map(String::as_str),
+                                level,
+                            })
                             .or_default()
                             .1
                             .entry(AliasData {
@@ -271,7 +286,10 @@ fn normalize_imports(imports: Vec<AnnotatedImport>, combine_as_imports: bool) ->
                         block
                             .import_from_as
                             .entry((
-                                ImportFromData { module, level },
+                                ImportFromData {
+                                    module: module.map(String::as_str),
+                                    level,
+                                },
                                 AliasData {
                                     name: alias.name,
                                     asname: alias.asname,
@@ -290,9 +308,10 @@ fn normalize_imports(imports: Vec<AnnotatedImport>, combine_as_imports: bool) ->
 
                 // Propagate trailing commas.
                 if matches!(trailing_comma, TrailingComma::Present) {
-                    if let Some(entry) =
-                        block.import_from.get_mut(&ImportFromData { module, level })
-                    {
+                    if let Some(entry) = block.import_from.get_mut(&ImportFromData {
+                        module: module.map(String::as_str),
+                        level,
+                    }) {
                         entry.2 = trailing_comma;
                     }
                 }

src/isort/types.rs

@@ -18,14 +18,14 @@ impl Default for TrailingComma {
 
 #[derive(Debug, Hash, Ord, PartialOrd, Eq, PartialEq, Clone)]
 pub struct ImportFromData<'a> {
-    pub module: Option<&'a String>,
+    pub module: Option<&'a str>,
     pub level: Option<&'a usize>,
 }
 
 #[derive(Debug, Hash, Ord, PartialOrd, Eq, PartialEq)]
 pub struct AliasData<'a> {
     pub name: &'a str,
-    pub asname: Option<&'a String>,
+    pub asname: Option<&'a str>,
 }
 
 #[derive(Debug, Default, Clone)]

src/printer.rs

@@ -303,7 +303,7 @@ impl<'a> Printer<'a> {
     }
 }
 
-fn group_messages_by_filename(messages: &Vec<Message>) -> BTreeMap<&String, Vec<&Message>> {
+fn group_messages_by_filename(messages: &[Message]) -> BTreeMap<&String, Vec<&Message>> {
     let mut grouped_messages = BTreeMap::default();
     for message in messages {
         grouped_messages

src/pyflakes/checks.rs

@@ -132,7 +132,7 @@ pub fn default_except_not_last(
 #[derive(Debug, PartialEq)]
 enum DictionaryKey<'a> {
     Constant(&'a Constant),
-    Variable(&'a String),
+    Variable(&'a str),
 }
 
 fn convert_to_value(expr: &Expr) -> Option<DictionaryKey> {

src/pyupgrade/plugins/rewrite_unicode_literal.rs

@@ -6,7 +6,7 @@ use crate::checkers::ast::Checker;
 use crate::registry::{Check, CheckKind};
 
 /// UP025
-pub fn rewrite_unicode_literal(checker: &mut Checker, expr: &Expr, kind: &Option<String>) {
+pub fn rewrite_unicode_literal(checker: &mut Checker, expr: &Expr, kind: Option<&str>) {
     if let Some(const_kind) = kind {
         if const_kind.to_lowercase() == "u" {
             let mut check = Check::new(CheckKind::RewriteUnicodeLiteral, Range::from_located(expr));

src/pyupgrade/plugins/unnecessary_encode_utf8.rs

@@ -34,7 +34,7 @@ fn is_utf8_encoding_arg(arg: &Expr) -> bool {
     }
 }
 
-fn is_default_encode(args: &Vec<Expr>, kwargs: &Vec<Keyword>) -> bool {
+fn is_default_encode(args: &[Expr], kwargs: &[Keyword]) -> bool {
     match (args.len(), kwargs.len()) {
         // .encode()
         (0, 0) => true,
@@ -106,8 +106,8 @@ pub fn unnecessary_encode_utf8(
     checker: &mut Checker,
     expr: &Expr,
     func: &Expr,
-    args: &Vec<Expr>,
-    kwargs: &Vec<Keyword>,
+    args: &[Expr],
+    kwargs: &[Keyword],
 ) {
     let Some(variable) = match_encoded_variable(func) else {
         return;

src/pyupgrade/plugins/unnecessary_future_import.rs

@@ -73,7 +73,7 @@ pub fn unnecessary_future_import(checker: &mut Checker, stmt: &Stmt, names: &[Lo
             .map(|alias| format!("__future__.{}", alias.node.name))
             .collect();
         match autofix::helpers::remove_unused_imports(
-            unused_imports.iter().map(std::string::String::as_str),
+            unused_imports.iter().map(String::as_str),
             defined_by.0,
             defined_in.map(|node| node.0),
             &deleted,