Move enum_glob_use lint into wildcard_imports pass

Author: flip1995

clippy_lints/src/enum_glob_use.rs

@@ -195,7 +195,6 @@ pub mod else_if_without_else;
 pub mod empty_enum;
 pub mod entry;
 pub mod enum_clike;
-pub mod enum_glob_use;
 pub mod enum_variants;
 pub mod eq_op;
 pub mod erasing_op;
@@ -517,7 +516,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &empty_enum::EMPTY_ENUM,
         &entry::MAP_ENTRY,
         &enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT,
-        &enum_glob_use::ENUM_GLOB_USE,
         &enum_variants::ENUM_VARIANT_NAMES,
         &enum_variants::MODULE_INCEPTION,
         &enum_variants::MODULE_NAME_REPETITIONS,
@@ -809,6 +807,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &use_self::USE_SELF,
         &vec::USELESS_VEC,
         &wildcard_dependencies::WILDCARD_DEPENDENCIES,
+        &wildcard_imports::ENUM_GLOB_USE,
         &wildcard_imports::WILDCARD_IMPORTS,
         &write::PRINTLN_EMPTY_STRING,
         &write::PRINT_LITERAL,
@@ -832,7 +831,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
     store.register_late_pass(move || box types::Types::new(vec_box_size_threshold));
     store.register_late_pass(|| box booleans::NonminimalBool);
     store.register_late_pass(|| box eq_op::EqOp);
-    store.register_late_pass(|| box enum_glob_use::EnumGlobUse);
     store.register_late_pass(|| box enum_clike::UnportableVariant);
     store.register_late_pass(|| box excessive_precision::ExcessivePrecision);
     let verbose_bit_mask_threshold = conf.verbose_bit_mask_threshold;
@@ -1056,7 +1054,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&doc::DOC_MARKDOWN),
         LintId::of(&doc::MISSING_ERRORS_DOC),
         LintId::of(&empty_enum::EMPTY_ENUM),
-        LintId::of(&enum_glob_use::ENUM_GLOB_USE),
         LintId::of(&enum_variants::MODULE_NAME_REPETITIONS),
         LintId::of(&enum_variants::PUB_ENUM_VARIANT_NAMES),
         LintId::of(&eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS),
@@ -1100,6 +1097,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&unicode::NON_ASCII_LITERAL),
         LintId::of(&unicode::UNICODE_NOT_NFC),
         LintId::of(&unused_self::UNUSED_SELF),
+        LintId::of(&wildcard_imports::ENUM_GLOB_USE),
         LintId::of(&wildcard_imports::WILDCARD_IMPORTS),
     ]);
 

clippy_lints/src/lib.rs

@@ -1,11 +1,32 @@
 use crate::utils::{in_macro, snippet_with_applicability, span_lint_and_sugg};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::*;
+use rustc_hir::{
+    def::{DefKind, Res},
+    Item, ItemKind, UseKind,
+};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::BytePos;
 
+declare_clippy_lint! {
+    /// **What it does:** Checks for `use Enum::*`.
+    ///
+    /// **Why is this bad?** It is usually better style to use the prefixed name of
+    /// an enumeration variant, rather than importing variants.
+    ///
+    /// **Known problems:** Old-style enumerations that prefix the variants are
+    /// still around.
+    ///
+    /// **Example:**
+    /// ```rust
+    /// use std::cmp::Ordering::*;
+    /// ```
+    pub ENUM_GLOB_USE,
+    pedantic,
+    "use items that import all variants of an enum"
+}
+
 declare_clippy_lint! {
     /// **What it does:** Checks for wildcard imports `use _::*`.
     ///
@@ -45,7 +66,7 @@ declare_clippy_lint! {
     "lint `use _::*` statements"
 }
 
-declare_lint_pass!(WildcardImports => [WILDCARD_IMPORTS]);
+declare_lint_pass!(WildcardImports => [ENUM_GLOB_USE, WILDCARD_IMPORTS]);
 
 impl LateLintPass<'_, '_> for WildcardImports {
     fn check_item(&mut self, cx: &LateContext<'_, '_>, item: &Item<'_>) {
@@ -94,11 +115,17 @@ impl LateLintPass<'_, '_> for WildcardImports {
                     format!("{}::{}", import_source, imports_string)
                 };
 
+                let (lint, message) = if let Res::Def(DefKind::Enum, _) = use_path.res {
+                    (ENUM_GLOB_USE, "usage of wildcard import for enum variants")
+                } else {
+                    (WILDCARD_IMPORTS, "usage of wildcard import")
+                };
+
                 span_lint_and_sugg(
                     cx,
-                    WILDCARD_IMPORTS,
+                    lint,
                     span,
-                    "usage of wildcard import",
+                    message,
                     "try",
                     sugg,
                     applicability,

clippy_lints/src/wildcard_imports.rs

@@ -0,0 +1,30 @@
+// run-rustfix
+
+#![warn(clippy::enum_glob_use)]
+#![allow(unused)]
+#![warn(unused_imports)]
+
+use std::cmp::Ordering::Less;
+
+enum Enum {
+    Foo,
+}
+
+use self::Enum::Foo;
+
+mod in_fn_test {
+    fn blarg() {
+        use crate::Enum::Foo;
+
+        let _ = Foo;
+    }
+}
+
+mod blurg {
+    pub use std::cmp::Ordering::*; // ok, re-export
+}
+
+fn main() {
+    let _ = Foo;
+    let _ = Less;
+}

tests/ui/enum_glob_use.fixed

@@ -1,29 +1,30 @@
-#![warn(clippy::all, clippy::pedantic)]
-#![allow(unused_imports, dead_code, clippy::missing_docs_in_private_items)]
+// run-rustfix
+
+#![warn(clippy::enum_glob_use)]
+#![allow(unused)]
+#![warn(unused_imports)]
 
 use std::cmp::Ordering::*;
 
 enum Enum {
-    _Foo,
+    Foo,
 }
 
 use self::Enum::*;
 
-fn blarg() {
-    use self::Enum::*; // ok, just for a function
+mod in_fn_test {
+    fn blarg() {
+        use crate::Enum::*;
+
+        let _ = Foo;
+    }
 }
 
 mod blurg {
     pub use std::cmp::Ordering::*; // ok, re-export
 }
 
-mod tests {
-    use super::*;
+fn main() {
+    let _ = Foo;
+    let _ = Less;
 }
-
-#[allow(non_snake_case)]
-mod CamelCaseName {}
-
-use CamelCaseName::*;
-
-fn main() {}

tests/ui/enum_glob_use.rs

@@ -1,16 +1,22 @@
-error: don't use glob imports for enum variants
-  --> $DIR/enum_glob_use.rs:4:1
+error: usage of wildcard import for enum variants
+  --> $DIR/enum_glob_use.rs:7:5
    |
 LL | use std::cmp::Ordering::*;
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^^^^^^^^^ help: try: `std::cmp::Ordering::Less`
    |
    = note: `-D clippy::enum-glob-use` implied by `-D warnings`
 
-error: don't use glob imports for enum variants
-  --> $DIR/enum_glob_use.rs:10:1
+error: usage of wildcard import for enum variants
+  --> $DIR/enum_glob_use.rs:13:5
    |
 LL | use self::Enum::*;
-   | ^^^^^^^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^^ help: try: `self::Enum::Foo`
 
-error: aborting due to 2 previous errors
+error: usage of wildcard import for enum variants
+  --> $DIR/enum_glob_use.rs:17:13
+   |
+LL |         use crate::Enum::*;
+   |             ^^^^^^^^^^^^^^ help: try: `crate::Enum::Foo`
+
+error: aborting due to 3 previous errors