feat: Deprioritize ops methods in completion

Author: Veykril

crates/hir/src/lib.rs

@@ -1610,6 +1610,12 @@ pub struct Trait {
 }
 
 impl Trait {
+    pub fn lang(db: &dyn HirDatabase, krate: Crate, name: &Name) -> Option<Trait> {
+        db.lang_item(krate.into(), name.to_smol_str())
+            .and_then(LangItemTarget::as_trait)
+            .map(Into::into)
+    }
+
     pub fn module(self, db: &dyn HirDatabase) -> Module {
         Module { id: self.id.lookup(db.upcast()).container }
     }

crates/hir_def/src/lang_item.rs

@@ -144,8 +144,8 @@ impl LangItems {
         let _p = profile::span("lang_item_query");
         let lang_items = db.crate_lang_items(start_crate);
         let start_crate_target = lang_items.items.get(&item);
-        if let Some(target) = start_crate_target {
-            return Some(*target);
+        if let Some(&target) = start_crate_target {
+            return Some(target);
         }
         db.crate_graph()[start_crate]
             .dependencies

crates/hir_expand/src/name.rs

@@ -309,39 +309,45 @@ pub mod known {
         wrapping_mul,
         wrapping_sub,
         // known methods of lang items
-        add,
-        mul,
-        sub,
-        div,
-        rem,
-        shl,
-        shr,
-        bitxor,
-        bitor,
-        bitand,
-        add_assign,
-        mul_assign,
-        sub_assign,
-        div_assign,
-        rem_assign,
-        shl_assign,
-        shr_assign,
-        bitxor_assign,
-        bitor_assign,
-        bitand_assign,
         eq,
         ne,
         ge,
         gt,
         le,
         lt,
         // lang items
-        not,
-        neg,
+        add_assign,
+        add,
+        bitand_assign,
+        bitand,
+        bitor_assign,
+        bitor,
+        bitxor_assign,
+        bitxor,
+        deref_mut,
+        deref,
+        div_assign,
+        div,
+        fn_mut,
+        fn_once,
         future_trait,
-        owned_box,
         index,
-        partial_ord
+        index_mut,
+        mul_assign,
+        mul,
+        neg,
+        not,
+        owned_box,
+        partial_ord,
+        r#fn,
+        rem_assign,
+        rem,
+        shl_assign,
+        shl,
+        shr_assign,
+        shr,
+        sub_assign,
+        sub,
     );
 
     // self/Self cannot be used as an identifier

crates/ide_completion/src/context.rs

@@ -3,13 +3,14 @@
 use std::iter;
 
 use base_db::SourceDatabaseExt;
-use hir::{Local, Name, ScopeDef, Semantics, SemanticsScope, Type, TypeInfo};
+use hir::{known, Local, Name, ScopeDef, Semantics, SemanticsScope, Type, TypeInfo};
 use ide_db::{
     active_parameter::ActiveParameter,
     base_db::{FilePosition, SourceDatabase},
     helpers::FamousDefs,
     RootDatabase,
 };
+use rustc_hash::FxHashSet;
 use syntax::{
     algo::find_node_at_offset,
     ast::{self, HasName, NameOrNameRef},
@@ -85,6 +86,7 @@ pub(crate) enum ParamKind {
     Function,
     Closure,
 }
+
 /// `CompletionContext` is created early during completion to figure out, where
 /// exactly is the cursor, syntax-wise.
 #[derive(Debug)]
@@ -120,7 +122,10 @@ pub(crate) struct CompletionContext<'a> {
     pub(super) lifetime_ctx: Option<LifetimeContext>,
     pub(super) pattern_ctx: Option<PatternContext>,
     pub(super) path_context: Option<PathCompletionContext>,
+
     pub(super) locals: Vec<(Name, Local)>,
+    /// Operator traits defined in the project
+    pub(super) ops_traits: FxHashSet<hir::Trait>,
 
     no_completion_required: bool,
 }
@@ -308,6 +313,11 @@ impl<'a> CompletionContext<'a> {
         self.token.kind() == BANG && self.token.parent().map_or(false, |it| it.kind() == MACRO_CALL)
     }
 
+    /// Whether the given trait is an operator trait or not.
+    pub(crate) fn is_ops_trait(&self, trait_: hir::Trait) -> bool {
+        self.ops_traits.contains(&trait_)
+    }
+
     /// A version of [`SemanticsScope::process_all_names`] that filters out `#[doc(hidden)]` items.
     pub(crate) fn process_all_names(&self, f: &mut dyn FnMut(Name, ScopeDef)) {
         let _p = profile::span("CompletionContext::process_all_names");
@@ -388,6 +398,17 @@ impl<'a> CompletionContext<'a> {
                 locals.push((name, local));
             }
         });
+        let mut ops_traits =
+            FxHashSet::with_capacity_and_hasher(OP_TRAIT_LANG_NAMES.len(), Default::default());
+        if let Some(krate) = krate {
+            let _p = profile::span("CompletionContext::new ops");
+            for trait_ in
+                OP_TRAIT_LANG_NAMES.iter().filter_map(|item| hir::Trait::lang(db, krate, item))
+            {
+                ops_traits.insert(trait_);
+            }
+        }
+
         let mut ctx = CompletionContext {
             sema,
             scope,
@@ -413,6 +434,7 @@ impl<'a> CompletionContext<'a> {
             locals,
             incomplete_let: false,
             no_completion_required: false,
+            ops_traits,
         };
         ctx.expand_and_fill(
             original_file.syntax().clone(),
@@ -889,6 +911,7 @@ fn pattern_context_for(pat: ast::Pat) -> PatternContext {
         });
     PatternContext { refutability, is_param, has_type_ascription }
 }
+
 fn find_node_with_range<N: AstNode>(syntax: &SyntaxNode, range: TextRange) -> Option<N> {
     syntax.covering_element(range).ancestors().find_map(N::cast)
 }
@@ -915,6 +938,37 @@ fn has_ref(token: &SyntaxToken) -> bool {
     token.kind() == T![&]
 }
 
+const OP_TRAIT_LANG_NAMES: &[hir::Name] = &[
+    known::add_assign,
+    known::add,
+    known::bitand_assign,
+    known::bitand,
+    known::bitor_assign,
+    known::bitor,
+    known::bitxor_assign,
+    known::bitxor,
+    known::deref_mut,
+    known::deref,
+    known::div_assign,
+    known::div,
+    known::fn_mut,
+    known::fn_once,
+    known::r#fn,
+    known::index_mut,
+    known::index,
+    known::mul_assign,
+    known::mul,
+    known::neg,
+    known::not,
+    known::rem_assign,
+    known::rem,
+    known::shl_assign,
+    known::shl,
+    known::shr_assign,
+    known::shr,
+    known::sub,
+    known::sub,
+];
 #[cfg(test)]
 mod tests {
     use expect_test::{expect, Expect};

crates/ide_completion/src/item.rs

@@ -139,6 +139,8 @@ pub struct CompletionRelevance {
     /// }
     /// ```
     pub is_local: bool,
+    /// Set for method completions of the `core::ops` family.
+    pub is_op_method: bool,
     /// This is set in cases like these:
     ///
     /// ```
@@ -198,6 +200,9 @@ impl CompletionRelevance {
         if self.is_local {
             score += 1;
         }
+        if self.is_op_method {
+            score -= 1;
+        }
         if self.exact_postfix_snippet_match {
             score += 100;
         }
@@ -588,10 +593,8 @@ mod tests {
                 ..CompletionRelevance::default()
             }],
             vec![CompletionRelevance {
-                exact_name_match: false,
-                type_match: None,
-                is_local: false,
                 exact_postfix_snippet_match: true,
+                ..CompletionRelevance::default()
             }],
         ];
 

crates/ide_completion/src/render/function.rs

@@ -70,6 +70,13 @@ fn render(
     item.set_relevance(CompletionRelevance {
         type_match: compute_type_match(completion, &ret_type),
         exact_name_match: compute_exact_name_match(completion, &call),
+        is_op_method: match func_type {
+            FuncType::Method(_) => func
+                .as_assoc_item(ctx.db())
+                .and_then(|trait_| trait_.containing_trait_or_trait_impl(ctx.db()))
+                .map_or(false, |trait_| completion.is_ops_trait(trait_)),
+            _ => false,
+        },
         ..CompletionRelevance::default()
     });