feat: Provide a config to control auto-insertion of await and iter()

crates/ide-completion/src/completions/dot.rs

@@ -42,31 +42,38 @@ pub(crate) fn complete_dot(
         item.detail("expr.await");
         item.add_to(acc, ctx.db);
 
-        // Completions that skip `.await`, e.g. `.await.foo()`.
-        let dot_access_kind = match &dot_access.kind {
-            DotAccessKind::Field { receiver_is_ambiguous_float_literal: _ } => {
-                DotAccessKind::Field { receiver_is_ambiguous_float_literal: false }
-            }
-            it @ DotAccessKind::Method { .. } => *it,
-        };
-        let dot_access = DotAccess {
-            receiver: dot_access.receiver.clone(),
-            receiver_ty: Some(hir::TypeInfo { original: future_output.clone(), adjusted: None }),
-            kind: dot_access_kind,
-            ctx: dot_access.ctx,
-        };
-        complete_fields(
-            acc,
-            ctx,
-            &future_output,
-            |acc, field, ty| acc.add_field(ctx, &dot_access, Some(await_str.clone()), field, &ty),
-            |acc, field, ty| acc.add_tuple_field(ctx, Some(await_str.clone()), field, &ty),
-            is_field_access,
-            is_method_access_with_parens,
-        );
-        complete_methods(ctx, &future_output, &traits_in_scope, |func| {
-            acc.add_method(ctx, &dot_access, func, Some(await_str.clone()), None)
-        });
+        if ctx.config.enable_auto_await {
+            // Completions that skip `.await`, e.g. `.await.foo()`.
+            let dot_access_kind = match &dot_access.kind {
+                DotAccessKind::Field { receiver_is_ambiguous_float_literal: _ } => {
+                    DotAccessKind::Field { receiver_is_ambiguous_float_literal: false }
+                }
+                it @ DotAccessKind::Method { .. } => *it,
+            };
+            let dot_access = DotAccess {
+                receiver: dot_access.receiver.clone(),
+                receiver_ty: Some(hir::TypeInfo {
+                    original: future_output.clone(),
+                    adjusted: None,
+                }),
+                kind: dot_access_kind,
+                ctx: dot_access.ctx,
+            };
+            complete_fields(
+                acc,
+                ctx,
+                &future_output,
+                |acc, field, ty| {
+                    acc.add_field(ctx, &dot_access, Some(await_str.clone()), field, &ty)
+                },
+                |acc, field, ty| acc.add_tuple_field(ctx, Some(await_str.clone()), field, &ty),
+                is_field_access,
+                is_method_access_with_parens,
+            );
+            complete_methods(ctx, &future_output, &traits_in_scope, |func| {
+                acc.add_method(ctx, &dot_access, func, Some(await_str.clone()), None)
+            });
+        }
     }
 
     complete_fields(
@@ -82,39 +89,41 @@ pub(crate) fn complete_dot(
         acc.add_method(ctx, dot_access, func, None, None)
     });
 
-    // FIXME:
-    // Checking for the existence of `iter()` is complicated in our setup, because we need to substitute
-    // its return type, so we instead check for `<&Self as IntoIterator>::IntoIter`.
-    // Does <&receiver_ty as IntoIterator>::IntoIter` exist? Assume `iter` is valid
-    let iter = receiver_ty
-        .strip_references()
-        .add_reference(hir::Mutability::Shared)
-        .into_iterator_iter(ctx.db)
-        .map(|ty| (ty, SmolStr::new_static("iter()")));
-    // Does <receiver_ty as IntoIterator>::IntoIter` exist?
-    let into_iter = || {
-        receiver_ty
-            .clone()
+    if ctx.config.enable_auto_iter {
+        // FIXME:
+        // Checking for the existence of `iter()` is complicated in our setup, because we need to substitute
+        // its return type, so we instead check for `<&Self as IntoIterator>::IntoIter`.
+        // Does <&receiver_ty as IntoIterator>::IntoIter` exist? Assume `iter` is valid
+        let iter = receiver_ty
+            .strip_references()
+            .add_reference(hir::Mutability::Shared)
             .into_iterator_iter(ctx.db)
-            .map(|ty| (ty, SmolStr::new_static("into_iter()")))
-    };
-    if let Some((iter, iter_sym)) = iter.or_else(into_iter) {
-        // Skip iterators, e.g. complete `.iter().filter_map()`.
-        let dot_access_kind = match &dot_access.kind {
-            DotAccessKind::Field { receiver_is_ambiguous_float_literal: _ } => {
-                DotAccessKind::Field { receiver_is_ambiguous_float_literal: false }
-            }
-            it @ DotAccessKind::Method { .. } => *it,
+            .map(|ty| (ty, SmolStr::new_static("iter()")));
+        // Does <receiver_ty as IntoIterator>::IntoIter` exist?
+        let into_iter = || {
+            receiver_ty
+                .clone()
+                .into_iterator_iter(ctx.db)
+                .map(|ty| (ty, SmolStr::new_static("into_iter()")))
         };
-        let dot_access = DotAccess {
-            receiver: dot_access.receiver.clone(),
-            receiver_ty: Some(hir::TypeInfo { original: iter.clone(), adjusted: None }),
-            kind: dot_access_kind,
-            ctx: dot_access.ctx,
-        };
-        complete_methods(ctx, &iter, &traits_in_scope, |func| {
-            acc.add_method(ctx, &dot_access, func, Some(iter_sym.clone()), None)
-        });
+        if let Some((iter, iter_sym)) = iter.or_else(into_iter) {
+            // Skip iterators, e.g. complete `.iter().filter_map()`.
+            let dot_access_kind = match &dot_access.kind {
+                DotAccessKind::Field { receiver_is_ambiguous_float_literal: _ } => {
+                    DotAccessKind::Field { receiver_is_ambiguous_float_literal: false }
+                }
+                it @ DotAccessKind::Method { .. } => *it,
+            };
+            let dot_access = DotAccess {
+                receiver: dot_access.receiver.clone(),
+                receiver_ty: Some(hir::TypeInfo { original: iter.clone(), adjusted: None }),
+                kind: dot_access_kind,
+                ctx: dot_access.ctx,
+            };
+            complete_methods(ctx, &iter, &traits_in_scope, |func| {
+                acc.add_method(ctx, &dot_access, func, Some(iter_sym.clone()), None)
+            });
+        }
     }
 }
 

crates/ide-completion/src/config.rs

@@ -14,6 +14,8 @@ pub struct CompletionConfig<'a> {
     pub enable_postfix_completions: bool,
     pub enable_imports_on_the_fly: bool,
     pub enable_self_on_the_fly: bool,
+    pub enable_auto_iter: bool,
+    pub enable_auto_await: bool,
     pub enable_private_editable: bool,
     pub enable_term_search: bool,
     pub term_search_fuel: u64,

crates/ide-completion/src/tests.rs

@@ -87,6 +87,8 @@ pub(crate) const TEST_CONFIG: CompletionConfig<'_> = CompletionConfig {
     fields_to_resolve: CompletionFieldsToResolve::empty(),
     exclude_flyimport: vec![],
     exclude_traits: &[],
+    enable_auto_await: true,
+    enable_auto_iter: true,
 };
 
 pub(crate) fn completion_list(#[rust_analyzer::rust_fixture] ra_fixture: &str) -> String {

crates/rust-analyzer/src/config.rs

@@ -453,6 +453,10 @@ config_data! {
         ///
         /// In `match` arms it completes a comma instead.
         completion_addSemicolonToUnit: bool = true,
+        /// Toggles the additional completions that automatically show method calls and field accesses with `await` prefixed to them when completing on a future.
+        completion_autoAwait_enable: bool        = true,
+        /// Toggles the additional completions that automatically show method calls with `iter()` or `into_iter()` prefixed to them when completing on a type that has them.
+        completion_autoIter_enable: bool        = true,
         /// Toggles the additional completions that automatically add imports when completed.
         /// Note that your client must specify the `additionalTextEdits` LSP client capability to truly have this feature enabled.
         completion_autoimport_enable: bool       = true,
@@ -1484,6 +1488,8 @@ impl Config {
             enable_imports_on_the_fly: self.completion_autoimport_enable(source_root).to_owned()
                 && self.caps.completion_item_edit_resolve(),
             enable_self_on_the_fly: self.completion_autoself_enable(source_root).to_owned(),
+            enable_auto_iter: *self.completion_autoIter_enable(source_root),
+            enable_auto_await: *self.completion_autoAwait_enable(source_root),
             enable_private_editable: self.completion_privateEditable_enable(source_root).to_owned(),
             full_function_signatures: self
                 .completion_fullFunctionSignatures_enable(source_root)

crates/rust-analyzer/src/integrated_benchmarks.rs

@@ -176,6 +176,8 @@ fn integrated_completion_benchmark() {
             fields_to_resolve: CompletionFieldsToResolve::empty(),
             exclude_flyimport: vec![],
             exclude_traits: &[],
+            enable_auto_await: true,
+            enable_auto_iter: true,
         };
         let position =
             FilePosition { file_id, offset: TextSize::try_from(completion_offset).unwrap() };
@@ -226,6 +228,8 @@ fn integrated_completion_benchmark() {
             fields_to_resolve: CompletionFieldsToResolve::empty(),
             exclude_flyimport: vec![],
             exclude_traits: &[],
+            enable_auto_await: true,
+            enable_auto_iter: true,
         };
         let position =
             FilePosition { file_id, offset: TextSize::try_from(completion_offset).unwrap() };
@@ -274,6 +278,8 @@ fn integrated_completion_benchmark() {
             fields_to_resolve: CompletionFieldsToResolve::empty(),
             exclude_flyimport: vec![],
             exclude_traits: &[],
+            enable_auto_await: true,
+            enable_auto_iter: true,
         };
         let position =
             FilePosition { file_id, offset: TextSize::try_from(completion_offset).unwrap() };

docs/user/generated_config.adoc

@@ -274,6 +274,16 @@ Whether to automatically add a semicolon when completing unit-returning function
 
 In `match` arms it completes a comma instead.
 --
+[[rust-analyzer.completion.autoAwait.enable]]rust-analyzer.completion.autoAwait.enable (default: `true`)::
++
+--
+Toggles the additional completions that automatically show method calls and field accesses with `await` prefixed to them when completing on a future.
+--
+[[rust-analyzer.completion.autoIter.enable]]rust-analyzer.completion.autoIter.enable (default: `true`)::
++
+--
+Toggles the additional completions that automatically show method calls with `iter()` or `into_iter()` prefixed to them when completing on a type that has them.
+--
 [[rust-analyzer.completion.autoimport.enable]]rust-analyzer.completion.autoimport.enable (default: `true`)::
 +
 --

editors/code/package.json

@@ -1143,6 +1143,26 @@
                     }
                 }
             },
+            {
+                "title": "completion",
+                "properties": {
+                    "rust-analyzer.completion.autoAwait.enable": {
+                        "markdownDescription": "Toggles the additional completions that automatically show method calls and field accesses with `await` prefixed to them when completing on a future.",
+                        "default": true,
+                        "type": "boolean"
+                    }
+                }
+            },
+            {
+                "title": "completion",
+                "properties": {
+                    "rust-analyzer.completion.autoIter.enable": {
+                        "markdownDescription": "Toggles the additional completions that automatically show method calls with `iter()` or `into_iter()` prefixed to them when completing on a type that has them.",
+                        "default": true,
+                        "type": "boolean"
+                    }
+                }
+            },
             {
                 "title": "completion",
                 "properties": {