Merge #6631

6631: Gate autoimports begind experimental completions flag r=kjeremy a=SomeoneToIgnore

Part of https://github.com/rust-analyzer/rust-analyzer/issues/6612

Adds a possibility to disable autoimports:

<img width="598" alt="image" src="https://user-images.githubusercontent.com/2690773/100156673-f8037f80-2eb1-11eb-8e74-59ebe4260ba3.png">

and other experimental completions we might want to add later.

Co-authored-by: Kirill Bulatov <[email protected]>

3 files changed, 12 insertions, 1 deletions

diff --git a/crates/completion/src/completions/unqualified_path.rs b/crates/completion/src/completions/unqualified_path.rs
index 86c143b63..4f1c9faa0 100644
--- a/crates/completion/src/completions/unqualified_path.rs
+++ b/crates/completion/src/completions/unqualified_path.rs
@@ -44,7 +44,9 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
         acc.add_resolution(ctx, name.to_string(), &res)
     });
 
-    fuzzy_completion(acc, ctx).unwrap_or_default()
+    if ctx.config.enable_experimental_completions {
+        fuzzy_completion(acc, ctx).unwrap_or_default()
+    }
 }
 
 fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &Type) {
diff --git a/crates/completion/src/config.rs b/crates/completion/src/config.rs
index 82874ff25..f50735372 100644
--- a/crates/completion/src/config.rs
+++ b/crates/completion/src/config.rs
@@ -9,6 +9,7 @@ use assists::utils::MergeBehaviour;
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CompletionConfig {
     pub enable_postfix_completions: bool,
+    pub enable_experimental_completions: bool,
     pub add_call_parenthesis: bool,
     pub add_call_argument_snippets: bool,
     pub snippet_cap: Option<SnippetCap>,
@@ -30,6 +31,7 @@ impl Default for CompletionConfig {
     fn default() -> Self {
         CompletionConfig {
             enable_postfix_completions: true,
+            enable_experimental_completions: true,
             add_call_parenthesis: true,
             add_call_argument_snippets: true,
             snippet_cap: Some(SnippetCap { _private: () }),
diff --git a/crates/completion/src/lib.rs b/crates/completion/src/lib.rs
index cb6e0554e..aecc1378b 100644
--- a/crates/completion/src/lib.rs
+++ b/crates/completion/src/lib.rs
@@ -67,6 +67,13 @@ pub use crate::{
 //     fn test_name() {}
 // }
 // ```
+//
+// And experimental completions, enabled with the `rust-analyzer.completion.enableExperimental` setting.
+// This flag enables or disables:
+//
+// - Auto import: additional completion options with automatic `use` import and options from all project importable items, matched for the input
+//
+// Experimental completions might cause issues with performance and completion list look.
 
 /// Main entry point for completion. We run completion as a two-phase process.
 ///