Fix #2927

Author: Michael Wright

clippy_lints/src/lib.rs

@@ -173,18 +173,14 @@ pub mod write;
 pub mod zero_div_zero;
 // end lints modules, do not remove this comment, it’s used in `update_lints`
 
+use crate::utils::conf::Conf;
+
 mod reexport {
     crate use syntax::ast::{Name, NodeId};
 }
 
-pub fn register_pre_expansion_lints(session: &rustc::session::Session, store: &mut rustc::lint::LintStore) {
-    store.register_pre_expansion_pass(Some(session), box write::Pass);
-    store.register_pre_expansion_pass(Some(session), box redundant_field_names::RedundantFieldNames);
-}
-
-#[rustfmt::skip]
-pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>) {
-    let conf = match utils::conf::file_from_args(reg.args()) {
+pub fn read_conf(reg: &rustc_plugin::Registry<'_>) -> Conf {
+    match utils::conf::file_from_args(reg.args()) {
         Ok(file_name) => {
             // if the user specified a file, it must exist, otherwise default to `clippy.toml` but
             // do not require the file to exist
@@ -226,8 +222,19 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>) {
                     .emit();
             toml::from_str("").expect("we never error on empty config files")
         }
-    };
+    }
+}
 
+pub fn register_pre_expansion_lints(session: &rustc::session::Session, store: &mut rustc::lint::LintStore, conf: &Conf) {
+    store.register_pre_expansion_pass(Some(session), box write::Pass);
+    store.register_pre_expansion_pass(Some(session), box redundant_field_names::RedundantFieldNames);
+    store.register_pre_expansion_pass(Some(session), box non_expressive_names::NonExpressiveNames {
+        single_char_binding_names_threshold: conf.single_char_binding_names_threshold,
+    });
+}
+
+#[rustfmt::skip]
+pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
     let mut store = reg.sess.lint_store.borrow_mut();
     store.register_removed(
         "should_assert_eq",
@@ -329,9 +336,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>) {
     reg.register_late_lint_pass(box derive::Derive);
     reg.register_late_lint_pass(box types::CharLitAsU8);
     reg.register_late_lint_pass(box vec::Pass);
-    reg.register_early_lint_pass(box non_expressive_names::NonExpressiveNames {
-        single_char_binding_names_threshold: conf.single_char_binding_names_threshold,
-    });
     reg.register_late_lint_pass(box drop_forget_ref::Pass);
     reg.register_late_lint_pass(box empty_enum::EmptyEnum);
     reg.register_late_lint_pass(box types::AbsurdExtremeComparisons);
@@ -347,9 +351,9 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>) {
     reg.register_late_lint_pass(box overflow_check_conditional::OverflowCheckConditional);
     reg.register_late_lint_pass(box unused_label::UnusedLabel);
     reg.register_late_lint_pass(box new_without_default::NewWithoutDefault);
-    reg.register_late_lint_pass(box blacklisted_name::BlackListedName::new(conf.blacklisted_names));
+    reg.register_late_lint_pass(box blacklisted_name::BlackListedName::new(conf.blacklisted_names.clone()));
     reg.register_late_lint_pass(box functions::Functions::new(conf.too_many_arguments_threshold));
-    reg.register_early_lint_pass(box doc::Doc::new(conf.doc_valid_idents));
+    reg.register_early_lint_pass(box doc::Doc::new(conf.doc_valid_idents.clone()));
     reg.register_late_lint_pass(box neg_multiply::NegMultiply);
     reg.register_early_lint_pass(box unsafe_removed_from_name::UnsafeNameRemoval);
     reg.register_late_lint_pass(box mem_forget::MemForget);

clippy_lints/src/non_expressive_names.rs

@@ -5,7 +5,7 @@ use syntax::symbol::LocalInternedString;
 use syntax::ast::*;
 use syntax::attr;
 use syntax::visit::{walk_block, walk_expr, walk_pat, Visitor};
-use crate::utils::{in_macro, span_lint, span_lint_and_then};
+use crate::utils::{span_lint, span_lint_and_then};
 
 /// **What it does:** Checks for names that are very similar and thus confusing.
 ///
@@ -147,9 +147,6 @@ impl<'a, 'tcx, 'b> SimilarNamesNameVisitor<'a, 'tcx, 'b> {
         }
     }
     fn check_name(&mut self, span: Span, name: Name) {
-        if in_macro(span) {
-            return;
-        }
         let interned_name = name.as_str();
         if interned_name.chars().any(char::is_uppercase) {
             return;
@@ -309,6 +306,9 @@ impl<'a, 'tcx> Visitor<'tcx> for SimilarNamesLocalVisitor<'a, 'tcx> {
     fn visit_item(&mut self, _: &Item) {
         // do not recurse into inner items
     }
+    fn visit_mac(&mut self, _mac: &Mac) {
+        // do not check macs
+    }
 }
 
 impl EarlyLintPass for NonExpressiveNames {
@@ -323,7 +323,6 @@ impl EarlyLintPass for NonExpressiveNames {
             do_check(self, cx, &item.attrs, &sig.decl, blk);
         }
     }
-
 }
 
 fn do_check(lint: &mut NonExpressiveNames, cx: &EarlyContext<'_>, attrs: &[Attribute], decl: &FnDecl, blk: &Block) {

src/driver.rs

@@ -96,7 +96,9 @@ pub fn main() {
                     .span,
             );
             registry.args_hidden = Some(Vec::new());
-            clippy_lints::register_plugins(&mut registry);
+
+            let conf = clippy_lints::read_conf(&registry);
+            clippy_lints::register_plugins(&mut registry, &conf);
 
             let rustc_plugin::registry::Registry {
                 early_lint_passes,
@@ -118,7 +120,7 @@ pub fn main() {
             for (name, to) in lint_groups {
                 ls.register_group(Some(sess), true, name, to);
             }
-            clippy_lints::register_pre_expansion_lints(sess, &mut ls);
+            clippy_lints::register_pre_expansion_lints(sess, &mut ls, &conf);
 
             sess.plugin_llvm_passes.borrow_mut().extend(llvm_passes);
             sess.plugin_attributes.borrow_mut().extend(attributes);

src/lib.rs

@@ -25,7 +25,8 @@ pub fn plugin_registrar(reg: &mut Registry<'_>) {
         }
     });
 
-    clippy_lints::register_plugins(reg);
+    let conf = clippy_lints::read_conf(reg);
+    clippy_lints::register_plugins(reg, &conf);
 }
 
 // only exists to let the dogfood integration test works.

tests/ui/non_expressive_names.rs

@@ -1,7 +1,7 @@
 
 
 #![warn(clippy,similar_names)]
-#![allow(unused)]
+#![allow(unused, println_empty_string)]
 
 
 struct Foo {
@@ -142,6 +142,11 @@ fn underscores_and_numbers() {
     let _1_ok= 1;
 }
 
+fn issue2927() {
+  let args = 1;
+  format!("{:?}", 2);
+}
+
 struct Bar;
 
 impl Bar {

tests/ui/non_expressive_names.stderr

@@ -1,23 +1,3 @@
-error: using `println!("")`
-  --> $DIR/non_expressive_names.rs:60:14
-   |
-60 |         _ => println!(""),
-   |              ^^^^^^^^^^^^ help: replace it with: `println!()`
-   |
-   = note: `-D println-empty-string` implied by `-D warnings`
-
-error: using `println!("")`
-   --> $DIR/non_expressive_names.rs:128:18
-    |
-128 |             1 => println!(""),
-    |                  ^^^^^^^^^^^^ help: replace it with: `println!()`
-
-error: using `println!("")`
-   --> $DIR/non_expressive_names.rs:132:18
-    |
-132 |             1 => println!(""),
-    |                  ^^^^^^^^^^^^ help: replace it with: `println!()`
-
 error: binding's name is too similar to existing binding
   --> $DIR/non_expressive_names.rs:18:9
    |
@@ -170,22 +150,22 @@ error: consider choosing a more descriptive name
     |         ^^^^^^^
 
 error: consider choosing a more descriptive name
-   --> $DIR/non_expressive_names.rs:149:13
+   --> $DIR/non_expressive_names.rs:154:13
     |
-149 |         let _1 = 1;
+154 |         let _1 = 1;
     |             ^^
 
 error: consider choosing a more descriptive name
-   --> $DIR/non_expressive_names.rs:150:13
+   --> $DIR/non_expressive_names.rs:155:13
     |
-150 |         let ____1 = 1;
+155 |         let ____1 = 1;
     |             ^^^^^
 
 error: consider choosing a more descriptive name
-   --> $DIR/non_expressive_names.rs:151:13
+   --> $DIR/non_expressive_names.rs:156:13
     |
-151 |         let __1___2 = 12;
+156 |         let __1___2 = 12;
     |             ^^^^^^^
 
-error: aborting due to 20 previous errors
+error: aborting due to 17 previous errors