2 files changed, 112 insertions, 38 deletions

diff --git a/crates/ide_db/src/helpers/insert_use.rs b/crates/ide_db/src/helpers/insert_use.rs
index 10bbafe77..e6b4832e7 100644
--- a/crates/ide_db/src/helpers/insert_use.rs
+++ b/crates/ide_db/src/helpers/insert_use.rs
@@ -5,7 +5,7 @@ use hir::Semantics;
 use syntax::{
     algo,
     ast::{self, make, AstNode, AttrsOwner, ModuleItemOwner, PathSegmentKind, VisibilityOwner},
-    ted, AstToken, Direction, NodeOrToken, SyntaxNode, SyntaxToken,
+    match_ast, ted, AstToken, Direction, NodeOrToken, SyntaxNode, SyntaxToken,
 };
 
 use crate::{
@@ -36,22 +36,39 @@ pub struct InsertUseConfig {
     pub enforce_granularity: bool,
     pub prefix_kind: PrefixKind,
     pub group: bool,
+    pub skip_glob_imports: bool,
 }
 
 #[derive(Debug, Clone)]
 pub enum ImportScope {
     File(ast::SourceFile),
     Module(ast::ItemList),
+    Block(ast::BlockExpr),
 }
 
 impl ImportScope {
-    pub fn from(syntax: SyntaxNode) -> Option<Self> {
-        if let Some(module) = ast::Module::cast(syntax.clone()) {
-            module.item_list().map(ImportScope::Module)
-        } else if let this @ Some(_) = ast::SourceFile::cast(syntax.clone()) {
-            this.map(ImportScope::File)
-        } else {
-            ast::ItemList::cast(syntax).map(ImportScope::Module)
+    fn from(syntax: SyntaxNode) -> Option<Self> {
+        fn contains_cfg_attr(attrs: &dyn AttrsOwner) -> bool {
+            attrs
+                .attrs()
+                .any(|attr| attr.as_simple_call().map_or(false, |(ident, _)| ident == "cfg"))
+        }
+        match_ast! {
+            match syntax {
+                ast::Module(module) => module.item_list().map(ImportScope::Module),
+                ast::SourceFile(file) => Some(ImportScope::File(file)),
+                ast::Fn(func) => contains_cfg_attr(&func).then(|| func.body().map(ImportScope::Block)).flatten(),
+                ast::Const(konst) => contains_cfg_attr(&konst).then(|| match konst.body()? {
+                    ast::Expr::BlockExpr(block) => Some(block),
+                    _ => None,
+                }).flatten().map(ImportScope::Block),
+                ast::Static(statik) => contains_cfg_attr(&statik).then(|| match statik.body()? {
+                    ast::Expr::BlockExpr(block) => Some(block),
+                    _ => None,
+                }).flatten().map(ImportScope::Block),
+                _ => None,
+
+            }
         }
     }
 
@@ -72,6 +89,7 @@ impl ImportScope {
         match self {
             ImportScope::File(file) => file.syntax(),
             ImportScope::Module(item_list) => item_list.syntax(),
+            ImportScope::Block(block) => block.syntax(),
         }
     }
 
@@ -79,6 +97,7 @@ impl ImportScope {
         match self {
             ImportScope::File(file) => ImportScope::File(file.clone_for_update()),
             ImportScope::Module(item_list) => ImportScope::Module(item_list.clone_for_update()),
+            ImportScope::Block(block) => ImportScope::Block(block.clone_for_update()),
         }
     }
 
@@ -95,6 +114,7 @@ impl ImportScope {
         let mut use_stmts = match self {
             ImportScope::File(f) => f.items(),
             ImportScope::Module(m) => m.items(),
+            ImportScope::Block(b) => b.items(),
         }
         .filter_map(use_stmt);
         let mut res = ImportGranularityGuess::Unknown;
@@ -153,7 +173,7 @@ enum ImportGranularityGuess {
 }
 
 /// Insert an import path into the given file/node. A `merge` value of none indicates that no import merging is allowed to occur.
-pub fn insert_use<'a>(scope: &ImportScope, path: ast::Path, cfg: InsertUseConfig) {
+pub fn insert_use<'a>(scope: &ImportScope, path: ast::Path, cfg: &InsertUseConfig) {
     let _p = profile::span("insert_use");
     let mut mb = match cfg.granularity {
         ImportGranularity::Crate => Some(MergeBehavior::Crate),
@@ -175,7 +195,10 @@ pub fn insert_use<'a>(scope: &ImportScope, path: ast::Path, cfg: InsertUseConfig
         make::use_(None, make::use_tree(path.clone(), None, None, false)).clone_for_update();
     // merge into existing imports if possible
     if let Some(mb) = mb {
-        for existing_use in scope.as_syntax_node().children().filter_map(ast::Use::cast) {
+        let filter = |it: &_| !(cfg.skip_glob_imports && ast::Use::is_simple_glob(it));
+        for existing_use in
+            scope.as_syntax_node().children().filter_map(ast::Use::cast).filter(filter)
+        {
             if let Some(merged) = try_merge_imports(&existing_use, &use_item, mb) {
                 ted::replace(existing_use.syntax(), merged.syntax());
                 return;
@@ -315,28 +338,29 @@ fn insert_use_(
         ted::insert(ted::Position::after(last_inner_element), make::tokens::single_newline());
         return;
     }
-    match scope {
+    let l_curly = match scope {
         ImportScope::File(_) => {
             cov_mark::hit!(insert_group_empty_file);
             ted::insert(ted::Position::first_child_of(scope_syntax), make::tokens::blank_line());
-            ted::insert(ted::Position::first_child_of(scope_syntax), use_item.syntax())
+            ted::insert(ted::Position::first_child_of(scope_syntax), use_item.syntax());
+            return;
         }
+        // don't insert the imports before the item list/block expr's opening curly brace
+        ImportScope::Module(item_list) => item_list.l_curly_token(),
         // don't insert the imports before the item list's opening curly brace
-        ImportScope::Module(item_list) => match item_list.l_curly_token() {
-            Some(b) => {
-                cov_mark::hit!(insert_group_empty_module);
-                ted::insert(ted::Position::after(&b), make::tokens::single_newline());
-                ted::insert(ted::Position::after(&b), use_item.syntax());
-            }
-            None => {
-                // This should never happens, broken module syntax node
-                ted::insert(
-                    ted::Position::first_child_of(scope_syntax),
-                    make::tokens::blank_line(),
-                );
-                ted::insert(ted::Position::first_child_of(scope_syntax), use_item.syntax());
-            }
-        },
+        ImportScope::Block(block) => block.l_curly_token(),
+    };
+    match l_curly {
+        Some(b) => {
+            cov_mark::hit!(insert_group_empty_module);
+            ted::insert(ted::Position::after(&b), make::tokens::single_newline());
+            ted::insert(ted::Position::after(&b), use_item.syntax());
+        }
+        None => {
+            // This should never happens, broken module syntax node
+            ted::insert(ted::Position::first_child_of(scope_syntax), make::tokens::blank_line());
+            ted::insert(ted::Position::first_child_of(scope_syntax), use_item.syntax());
+        }
     }
 }
 
diff --git a/crates/ide_db/src/helpers/insert_use/tests.rs b/crates/ide_db/src/helpers/insert_use/tests.rs
index 5a88ec742..263edcdc9 100644
--- a/crates/ide_db/src/helpers/insert_use/tests.rs
+++ b/crates/ide_db/src/helpers/insert_use/tests.rs
@@ -4,6 +4,23 @@ use hir::PrefixKind;
 use test_utils::assert_eq_text;
 
 #[test]
+fn insert_skips_lone_glob_imports() {
+    check(
+        "use foo::baz::A",
+        r"
+use foo::bar::*;
+",
+        r"
+use foo::bar::*;
+use foo::baz::A;
+",
+        ImportGranularity::Crate,
+        false,
+        false,
+    );
+}
+
+#[test]
 fn insert_not_group() {
     cov_mark::check!(insert_no_grouping_last);
     check(
@@ -534,17 +551,37 @@ fn merge_groups_self() {
 
 #[test]
 fn merge_mod_into_glob() {
-    check_crate(
+    check_with_config(
         "token::TokenKind",
         r"use token::TokenKind::*;",
         r"use token::TokenKind::{*, self};",
+        false,
+        &InsertUseConfig {
+            granularity: ImportGranularity::Crate,
+            enforce_granularity: true,
+            prefix_kind: PrefixKind::Plain,
+            group: false,
+            skip_glob_imports: false,
+        },
     )
     // FIXME: have it emit `use token::TokenKind::{self, *}`?
 }
 
 #[test]
 fn merge_self_glob() {
-    check_crate("self", r"use self::*;", r"use self::{*, self};")
+    check_with_config(
+        "self",
+        r"use self::*;",
+        r"use self::{*, self};",
+        false,
+        &InsertUseConfig {
+            granularity: ImportGranularity::Crate,
+            enforce_granularity: true,
+            prefix_kind: PrefixKind::Plain,
+            group: false,
+            skip_glob_imports: false,
+        },
+    )
     // FIXME: have it emit `use {self, *}`?
 }
 
@@ -757,13 +794,12 @@ use foo::bar::qux;
     );
 }
 
-fn check(
+fn check_with_config(
     path: &str,
     ra_fixture_before: &str,
     ra_fixture_after: &str,
-    granularity: ImportGranularity,
     module: bool,
-    group: bool,
+    config: &InsertUseConfig,
 ) {
     let mut syntax = ast::SourceFile::parse(ra_fixture_before).tree().syntax().clone();
     if module {
@@ -777,18 +813,32 @@ fn check(
         .find_map(ast::Path::cast)
         .unwrap();
 
-    insert_use(
-        &file,
+    insert_use(&file, path, config);
+    let result = file.as_syntax_node().to_string();
+    assert_eq_text!(ra_fixture_after, &result);
+}
+
+fn check(
+    path: &str,
+    ra_fixture_before: &str,
+    ra_fixture_after: &str,
+    granularity: ImportGranularity,
+    module: bool,
+    group: bool,
+) {
+    check_with_config(
         path,
-        InsertUseConfig {
+        ra_fixture_before,
+        ra_fixture_after,
+        module,
+        &InsertUseConfig {
             granularity,
             enforce_granularity: true,
             prefix_kind: PrefixKind::Plain,
             group,
+            skip_glob_imports: true,
         },
-    );
-    let result = file.as_syntax_node().to_string();
-    assert_eq_text!(ra_fixture_after, &result);
+    )
 }
 
 fn check_crate(path: &str, ra_fixture_before: &str, ra_fixture_after: &str) {