4 files changed, 294 insertions, 4 deletions

diff --git a/crates/completion/src/completions/keyword.rs b/crates/completion/src/completions/keyword.rs
index c7df15900..720349b9d 100644
--- a/crates/completion/src/completions/keyword.rs
+++ b/crates/completion/src/completions/keyword.rs
@@ -44,6 +44,10 @@ pub(crate) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
         mark::hit!(no_keyword_completion_in_comments);
         return;
     }
+    if ctx.record_lit_syntax.is_some() {
+        mark::hit!(no_keyword_completion_in_record_lit);
+        return;
+    }
 
     let has_trait_or_impl_parent = ctx.has_impl_parent || ctx.has_trait_parent;
     if ctx.trait_as_prev_sibling || ctx.impl_as_prev_sibling {
@@ -563,4 +567,46 @@ struct Foo {
             "#]],
         )
     }
+
+    #[test]
+    fn skip_struct_initializer() {
+        mark::check!(no_keyword_completion_in_record_lit);
+        check(
+            r#"
+struct Foo {
+    pub f: i32,
+}
+fn foo() {
+    Foo {
+        <|>
+    }
+}
+"#,
+            expect![[r#""#]],
+        );
+    }
+
+    #[test]
+    fn struct_initializer_field_expr() {
+        check(
+            r#"
+struct Foo {
+    pub f: i32,
+}
+fn foo() {
+    Foo {
+        f: <|>
+    }
+}
+"#,
+            expect![[r#"
+                kw if
+                kw if let
+                kw loop
+                kw match
+                kw return
+                kw while
+            "#]],
+        );
+    }
 }
diff --git a/crates/completion/src/completions/postfix.rs b/crates/completion/src/completions/postfix.rs
index 348f017bd..7fbda7a6b 100644
--- a/crates/completion/src/completions/postfix.rs
+++ b/crates/completion/src/completions/postfix.rs
@@ -184,6 +184,16 @@ pub(crate) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
         ctx,
         cap,
         &dot_receiver,
+        "some",
+        "Some(expr)",
+        &format!("Some({})", receiver_text),
+    )
+    .add_to(acc);
+
+    postfix_snippet(
+        ctx,
+        cap,
+        &dot_receiver,
         "dbg",
         "dbg!(expr)",
         &format!("dbg!({})", receiver_text),
@@ -291,6 +301,7 @@ fn main() {
                 sn ok    Ok(expr)
                 sn ref   &expr
                 sn refm  &mut expr
+                sn some  Some(expr)
                 sn while while expr {}
             "#]],
         );
@@ -314,6 +325,7 @@ fn main() {
                 sn ok    Ok(expr)
                 sn ref   &expr
                 sn refm  &mut expr
+                sn some  Some(expr)
             "#]],
         )
     }
diff --git a/crates/completion/src/completions/record.rs b/crates/completion/src/completions/record.rs
index 0f611084b..2049b9d09 100644
--- a/crates/completion/src/completions/record.rs
+++ b/crates/completion/src/completions/record.rs
@@ -1,16 +1,43 @@
 //! Complete fields in record literals and patterns.
-use crate::{CompletionContext, Completions};
+use assists::utils::FamousDefs;
+use syntax::ast::Expr;
+
+use crate::{
+    item::CompletionKind, CompletionContext, CompletionItem, CompletionItemKind, Completions,
+};
 
 pub(crate) fn complete_record(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
     let missing_fields = match (ctx.record_pat_syntax.as_ref(), ctx.record_lit_syntax.as_ref()) {
         (None, None) => return None,
         (Some(_), Some(_)) => unreachable!("A record cannot be both a literal and a pattern"),
         (Some(record_pat), _) => ctx.sema.record_pattern_missing_fields(record_pat),
-        (_, Some(record_lit)) => ctx.sema.record_literal_missing_fields(record_lit),
+        (_, Some(record_lit)) => {
+            let ty = ctx.sema.type_of_expr(&Expr::RecordExpr(record_lit.clone()));
+            let default_trait = FamousDefs(&ctx.sema, ctx.krate).core_default_Default();
+            let impl_default_trait = default_trait
+                .and_then(|default_trait| ty.map(|ty| ty.impls_trait(ctx.db, default_trait, &[])))
+                .unwrap_or(false);
+
+            let missing_fields = ctx.sema.record_literal_missing_fields(record_lit);
+            if impl_default_trait && !missing_fields.is_empty() {
+                acc.add(
+                    CompletionItem::new(
+                        CompletionKind::Snippet,
+                        ctx.source_range(),
+                        "..Default::default()",
+                    )
+                    .insert_text("..Default::default()")
+                    .kind(CompletionItemKind::Field)
+                    .build(),
+                );
+            }
+
+            missing_fields
+        }
     };
 
     for (field, ty) in missing_fields {
-        acc.add_field(ctx, field, &ty)
+        acc.add_field(ctx, field, &ty);
     }
 
     Some(())
@@ -18,6 +45,7 @@ pub(crate) fn complete_record(acc: &mut Completions, ctx: &CompletionContext) ->
 
 #[cfg(test)]
 mod tests {
+    use assists::utils::FamousDefs;
     use expect_test::{expect, Expect};
 
     use crate::{test_utils::completion_list, CompletionKind};
@@ -27,6 +55,80 @@ mod tests {
         expect.assert_eq(&actual);
     }
 
+    fn check_snippet(ra_fixture: &str, expect: Expect) {
+        let actual = completion_list(
+            &format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE),
+            CompletionKind::Snippet,
+        );
+        expect.assert_eq(&actual);
+    }
+
+    #[test]
+    fn test_record_literal_field_default() {
+        let test_code = r#"
+struct S { foo: u32, bar: usize }
+
+impl core::default::Default for S {
+    fn default() -> Self {
+        S {
+            foo: 0,
+            bar: 0,
+        }
+    }
+}
+
+fn process(f: S) {
+    let other = S {
+        foo: 5,
+        .<|>
+    };
+}
+"#;
+        check(
+            test_code,
+            expect![[r#"
+                fd bar usize
+            "#]],
+        );
+
+        check_snippet(
+            test_code,
+            expect![[r#"
+                fd ..Default::default()
+                sn pd
+                sn ppd
+            "#]],
+        );
+    }
+
+    #[test]
+    fn test_record_literal_field_without_default() {
+        let test_code = r#"
+struct S { foo: u32, bar: usize }
+
+fn process(f: S) {
+    let other = S {
+        foo: 5,
+        .<|>
+    };
+}
+"#;
+        check(
+            test_code,
+            expect![[r#"
+                fd bar usize
+            "#]],
+        );
+
+        check_snippet(
+            test_code,
+            expect![[r#"
+                sn pd
+                sn ppd
+            "#]],
+        );
+    }
+
     #[test]
     fn test_record_pattern_field() {
         check(
diff --git a/crates/completion/src/completions/unqualified_path.rs b/crates/completion/src/completions/unqualified_path.rs
index 7df58e1da..4f1c9faa0 100644
--- a/crates/completion/src/completions/unqualified_path.rs
+++ b/crates/completion/src/completions/unqualified_path.rs
@@ -1,10 +1,16 @@
 //! Completion of names from the current scope, e.g. locals and imported items.
 
+use assists::utils::ImportScope;
+use either::Either;
 use hir::{Adt, ModuleDef, ScopeDef, Type};
+use ide_db::imports_locator;
 use syntax::AstNode;
 use test_utils::mark;
 
-use crate::{CompletionContext, Completions};
+use crate::{
+    render::{render_resolution_with_import, RenderContext},
+    CompletionContext, Completions,
+};
 
 pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionContext) {
     if !(ctx.is_trivial_path || ctx.is_pat_binding_or_const) {
@@ -37,6 +43,10 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
         }
         acc.add_resolution(ctx, name.to_string(), &res)
     });
+
+    if ctx.config.enable_experimental_completions {
+        fuzzy_completion(acc, ctx).unwrap_or_default()
+    }
 }
 
 fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &Type) {
@@ -63,6 +73,45 @@ fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &T
     }
 }
 
+fn fuzzy_completion(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
+    let _p = profile::span("fuzzy_completion");
+    let current_module = ctx.scope.module()?;
+    let anchor = ctx.name_ref_syntax.as_ref()?;
+    let import_scope = ImportScope::find_insert_use_container(anchor.syntax(), &ctx.sema)?;
+
+    let potential_import_name = ctx.token.to_string();
+
+    let possible_imports =
+        imports_locator::find_similar_imports(&ctx.sema, ctx.krate?, &potential_import_name, 400)
+            .filter_map(|import_candidate| match import_candidate {
+                // when completing outside the use declaration, modules are pretty useless
+                // and tend to bloat the completion suggestions a lot
+                Either::Left(ModuleDef::Module(_)) => None,
+                Either::Left(module_def) => Some((
+                    current_module.find_use_path(ctx.db, module_def)?,
+                    ScopeDef::ModuleDef(module_def),
+                )),
+                Either::Right(macro_def) => Some((
+                    current_module.find_use_path(ctx.db, macro_def)?,
+                    ScopeDef::MacroDef(macro_def),
+                )),
+            })
+            .filter(|(mod_path, _)| mod_path.len() > 1)
+            .filter_map(|(import_path, definition)| {
+                render_resolution_with_import(
+                    RenderContext::new(ctx),
+                    import_path.clone(),
+                    import_scope.clone(),
+                    ctx.config.merge,
+                    &definition,
+                )
+            })
+            .take(20);
+
+    acc.add_all(possible_imports);
+    Some(())
+}
+
 #[cfg(test)]
 mod tests {
     use expect_test::{expect, Expect};
@@ -676,4 +725,85 @@ impl My<|>
             "#]],
         )
     }
+
+    #[test]
+    fn function_fuzzy_completion() {
+        check_edit(
+            "stdin",
+            r#"
+//- /lib.rs crate:dep
+pub mod io {
+    pub fn stdin() {}
+};
+
+//- /main.rs crate:main deps:dep
+fn main() {
+    stdi<|>
+}
+"#,
+            r#"
+use dep::io::stdin;
+
+fn main() {
+    stdin()$0
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn macro_fuzzy_completion() {
+        check_edit(
+            "macro_with_curlies!",
+            r#"
+//- /lib.rs crate:dep
+/// Please call me as macro_with_curlies! {}
+#[macro_export]
+macro_rules! macro_with_curlies {
+    () => {}
+}
+
+//- /main.rs crate:main deps:dep
+fn main() {
+    curli<|>
+}
+"#,
+            r#"
+use dep::macro_with_curlies;
+
+fn main() {
+    macro_with_curlies! {$0}
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn struct_fuzzy_completion() {
+        check_edit(
+            "ThirdStruct",
+            r#"
+//- /lib.rs crate:dep
+pub struct FirstStruct;
+pub mod some_module {
+    pub struct SecondStruct;
+    pub struct ThirdStruct;
+}
+
+//- /main.rs crate:main deps:dep
+use dep::{FirstStruct, some_module::SecondStruct};
+
+fn main() {
+    this<|>
+}
+"#,
+            r#"
+use dep::{FirstStruct, some_module::{SecondStruct, ThirdStruct}};
+
+fn main() {
+    ThirdStruct
+}
+"#,
+        );
+    }
 }