11 files changed, 252 insertions, 200 deletions

diff --git a/crates/ra_assists/src/handlers/add_from_impl_for_enum.rs b/crates/ra_assists/src/handlers/add_from_impl_for_enum.rs
index 776bddf91..b0e56e1b5 100644
--- a/crates/ra_assists/src/handlers/add_from_impl_for_enum.rs
+++ b/crates/ra_assists/src/handlers/add_from_impl_for_enum.rs
@@ -128,7 +128,7 @@ impl From<foo::bar::baz::Boo> for A {
 
     fn check_not_applicable(ra_fixture: &str) {
         let fixture =
-            format!("//- main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE);
+            format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE);
         check_assist_not_applicable(add_from_impl_for_enum, &fixture)
     }
 
diff --git a/crates/ra_assists/src/handlers/auto_import.rs b/crates/ra_assists/src/handlers/auto_import.rs
index 5092bf336..d1cafa7d9 100644
--- a/crates/ra_assists/src/handlers/auto_import.rs
+++ b/crates/ra_assists/src/handlers/auto_import.rs
@@ -488,16 +488,17 @@ mod tests {
         check_assist(
             auto_import,
             r"
-                    //- /lib.rs crate:crate_with_macro
-                    #[macro_export]
-                    macro_rules! foo {
-                        () => ()
-                    }
+//- /lib.rs crate:crate_with_macro
+#[macro_export]
+macro_rules! foo {
+    () => ()
+}
 
-                    //- /main.rs crate:main deps:crate_with_macro
-                    fn main() {
-                        foo<|>
-                    }",
+//- /main.rs crate:main deps:crate_with_macro
+fn main() {
+    foo<|>
+}
+",
             r"use crate_with_macro::foo;
 
 fn main() {
@@ -847,13 +848,14 @@ fn main() {
         check_assist(
             auto_import,
             r"
-                    //- /lib.rs crate:dep
-                    pub struct Struct;
+//- /lib.rs crate:dep
+pub struct Struct;
 
-                    //- /main.rs crate:main deps:dep
-                    fn main() {
-                        Struct<|>
-                    }",
+//- /main.rs crate:main deps:dep
+fn main() {
+    Struct<|>
+}
+",
             r"use dep::Struct;
 
 fn main() {
@@ -869,20 +871,22 @@ fn main() {
         check_assist(
             auto_import,
             r"
-                    //- /lib.rs crate:dep
-                    pub mod fmt {
-                        pub trait Display {}
-                    }
+//- /lib.rs crate:dep
+pub mod fmt {
+    pub trait Display {}
+}
 
-                    pub fn panic_fmt() {}
+pub fn panic_fmt() {}
 
-                    //- /main.rs crate:main deps:dep
-                    struct S;
+//- /main.rs crate:main deps:dep
+struct S;
 
-                    impl f<|>mt::Display for S {}",
+impl f<|>mt::Display for S {}
+",
             r"use dep::fmt;
 
 struct S;
+
 impl fmt::Display for S {}
 ",
         );
@@ -894,21 +898,20 @@ impl fmt::Display for S {}
         check_assist(
             auto_import,
             r"
-                    //- /lib.rs crate:dep
-
-                    macro_rules! mac {
-                        () => {
-                            pub struct Cheese;
-                        };
-                    }
-
-                    mac!();
+//- /lib.rs crate:dep
+macro_rules! mac {
+    () => {
+        pub struct Cheese;
+    };
+}
 
-                    //- /main.rs crate:main deps:dep
+mac!();
 
-                    fn main() {
-                        Cheese<|>;
-                    }",
+//- /main.rs crate:main deps:dep
+fn main() {
+    Cheese<|>;
+}
+",
             r"use dep::Cheese;
 
 fn main() {
@@ -924,16 +927,15 @@ fn main() {
         check_assist(
             auto_import,
             r"
-                    //- /lib.rs crate:dep
-
-                    pub struct FMT;
-                    pub struct fmt;
-
-                    //- /main.rs crate:main deps:dep
+//- /lib.rs crate:dep
+pub struct FMT;
+pub struct fmt;
 
-                    fn main() {
-                        FMT<|>;
-                    }",
+//- /main.rs crate:main deps:dep
+fn main() {
+    FMT<|>;
+}
+",
             r"use dep::FMT;
 
 fn main() {
diff --git a/crates/ra_assists/src/handlers/extract_struct_from_enum_variant.rs b/crates/ra_assists/src/handlers/extract_struct_from_enum_variant.rs
index 44db7917a..43b4584b4 100644
--- a/crates/ra_assists/src/handlers/extract_struct_from_enum_variant.rs
+++ b/crates/ra_assists/src/handlers/extract_struct_from_enum_variant.rs
@@ -301,7 +301,7 @@ fn another_fn() {
 
     fn check_not_applicable(ra_fixture: &str) {
         let fixture =
-            format!("//- main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE);
+            format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE);
         check_assist_not_applicable(extract_struct_from_enum_variant, &fixture)
     }
 
diff --git a/crates/ra_assists/src/handlers/fill_match_arms.rs b/crates/ra_assists/src/handlers/fill_match_arms.rs
index 569efb768..64270c86f 100644
--- a/crates/ra_assists/src/handlers/fill_match_arms.rs
+++ b/crates/ra_assists/src/handlers/fill_match_arms.rs
@@ -763,9 +763,9 @@ mod tests {
 fn foo(opt: Option<i32>) {
     match opt<|> {
     }
-}"#;
-        let before =
-            &format!("//- main.rs crate:main deps:core\n{}{}", before, FamousDefs::FIXTURE);
+}
+"#;
+        let before = &format!("//- /main.rs crate:main deps:core{}{}", before, FamousDefs::FIXTURE);
 
         check_assist(
             fill_match_arms,
diff --git a/crates/ra_assists/src/handlers/fix_visibility.rs b/crates/ra_assists/src/handlers/fix_visibility.rs
index 531b3560f..54601d1f3 100644
--- a/crates/ra_assists/src/handlers/fix_visibility.rs
+++ b/crates/ra_assists/src/handlers/fix_visibility.rs
@@ -255,15 +255,14 @@ mod tests {
         check_assist(
             fix_visibility,
             r"
-              //- /main.rs
-              mod foo;
-              fn main() { foo::Foo<|> }
+//- /main.rs
+mod foo;
+fn main() { foo::Foo<|> }
 
-              //- /foo.rs
-              struct Foo;
-              ",
+//- /foo.rs
+struct Foo;
+",
             r"$0pub(crate) struct Foo;
-
 ",
         );
     }
@@ -279,14 +278,14 @@ mod tests {
         );
         check_assist(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo { <|>bar: () }; }
-              //- /foo.rs
-              pub struct Foo { bar: () }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo { <|>bar: () }; }
+//- /foo.rs
+pub struct Foo { bar: () }
+",
             r"pub struct Foo { $0pub(crate) bar: () }
-
 ",
         );
         check_assist_not_applicable(
@@ -296,12 +295,13 @@ mod tests {
         );
         check_assist_not_applicable(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo { <|>bar: () }; }
-              //- /foo.rs
-              pub struct Foo { pub bar: () }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo { <|>bar: () }; }
+//- /foo.rs
+pub struct Foo { pub bar: () }
+",
         );
     }
 
@@ -316,14 +316,14 @@ mod tests {
         );
         check_assist(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo::Bar { <|>bar: () }; }
-              //- /foo.rs
-              pub enum Foo { Bar { bar: () } }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo::Bar { <|>bar: () }; }
+//- /foo.rs
+pub enum Foo { Bar { bar: () } }
+",
             r"pub enum Foo { Bar { $0pub(crate) bar: () } }
-
 ",
         );
         check_assist_not_applicable(
@@ -333,12 +333,13 @@ mod tests {
         );
         check_assist_not_applicable(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo { <|>bar: () }; }
-              //- /foo.rs
-              pub struct Foo { pub bar: () }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo { <|>bar: () }; }
+//- /foo.rs
+pub struct Foo { pub bar: () }
+",
         );
     }
 
@@ -355,14 +356,14 @@ mod tests {
         );
         check_assist(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo { <|>bar: () }; }
-              //- /foo.rs
-              pub union Foo { bar: () }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo { <|>bar: () }; }
+//- /foo.rs
+pub union Foo { bar: () }
+",
             r"pub union Foo { $0pub(crate) bar: () }
-
 ",
         );
         check_assist_not_applicable(
@@ -372,12 +373,13 @@ mod tests {
         );
         check_assist_not_applicable(
             fix_visibility,
-            r"//- /lib.rs
-              mod foo;
-              fn main() { foo::Foo { <|>bar: () }; }
-              //- /foo.rs
-              pub union Foo { pub bar: () }
-              ",
+            r"
+//- /lib.rs
+mod foo;
+fn main() { foo::Foo { <|>bar: () }; }
+//- /foo.rs
+pub union Foo { pub bar: () }
+",
         );
     }
 
@@ -458,19 +460,18 @@ mod tests {
         check_assist(
             fix_visibility,
             r"
-            //- /main.rs
-            mod foo;
-            fn main() { foo::bar<|>::baz(); }
+//- /main.rs
+mod foo;
+fn main() { foo::bar<|>::baz(); }
 
-            //- /foo.rs
-            mod bar {
-                pub fn baz() {}
-            }
-            ",
+//- /foo.rs
+mod bar {
+    pub fn baz() {}
+}
+",
             r"$0pub(crate) mod bar {
     pub fn baz() {}
 }
-
 ",
         );
 
@@ -486,17 +487,15 @@ mod tests {
         check_assist(
             fix_visibility,
             r"
-            //- /main.rs
-            mod foo;
-            fn main() { foo::bar<|>::baz(); }
-
-            //- /foo.rs
-            mod bar;
-
-            //- /foo/bar.rs
-            pub fn baz() {}
-            }
-            ",
+//- /main.rs
+mod foo;
+fn main() { foo::bar<|>::baz(); }
+
+//- /foo.rs
+mod bar;
+//- /foo/bar.rs
+pub fn baz() {}
+",
             r"$0pub(crate) mod bar;
 ",
         );
@@ -506,14 +505,16 @@ mod tests {
     fn fix_visibility_of_module_declaration_in_other_file() {
         check_assist(
             fix_visibility,
-            r"//- /main.rs
-              mod foo;
-              fn main() { foo::bar<|>>::baz(); }
+            r"
+//- /main.rs
+mod foo;
+fn main() { foo::bar<|>>::baz(); }
 
-              //- /foo.rs
-              mod bar {
-                  pub fn baz() {}
-              }",
+//- /foo.rs
+mod bar {
+    pub fn baz() {}
+}
+",
             r"$0pub(crate) mod bar {
     pub fn baz() {}
 }
@@ -525,10 +526,12 @@ mod tests {
     fn adds_pub_when_target_is_in_another_crate() {
         check_assist(
             fix_visibility,
-            r"//- /main.rs crate:a deps:foo
-              foo::Bar<|>
-              //- /lib.rs crate:foo
-              struct Bar;",
+            r"
+//- /main.rs crate:a deps:foo
+foo::Bar<|>
+//- /lib.rs crate:foo
+struct Bar;
+",
             r"$0pub struct Bar;
 ",
         )
diff --git a/crates/ra_assists/src/handlers/introduce_variable.rs b/crates/ra_assists/src/handlers/introduce_variable.rs
index 31d6539f7..96affe49d 100644
--- a/crates/ra_assists/src/handlers/introduce_variable.rs
+++ b/crates/ra_assists/src/handlers/introduce_variable.rs
@@ -44,12 +44,26 @@ pub(crate) fn introduce_variable(acc: &mut Assists, ctx: &AssistContext) -> Opti
     }
     let target = expr.syntax().text_range();
     acc.add(AssistId("introduce_variable"), "Extract into variable", target, move |edit| {
+        let field_shorthand = match expr.syntax().parent().and_then(ast::RecordField::cast) {
+            Some(field) => field.name_ref(),
+            None => None,
+        };
+
         let mut buf = String::new();
 
+        let var_name = match &field_shorthand {
+            Some(it) => it.to_string(),
+            None => "var_name".to_string(),
+        };
+        let expr_range = match &field_shorthand {
+            Some(it) => it.syntax().text_range().cover(expr.syntax().text_range()),
+            None => expr.syntax().text_range(),
+        };
+
         if wrap_in_block {
-            buf.push_str("{ let var_name = ");
+            format_to!(buf, "{{ let {} = ", var_name);
         } else {
-            buf.push_str("let var_name = ");
+            format_to!(buf, "let {} = ", var_name);
         };
         format_to!(buf, "{}", expr.syntax());
 
@@ -64,13 +78,13 @@ pub(crate) fn introduce_variable(acc: &mut Assists, ctx: &AssistContext) -> Opti
             if full_stmt.unwrap().semicolon_token().is_none() {
                 buf.push_str(";");
             }
-            let offset = expr.syntax().text_range();
             match ctx.config.snippet_cap {
                 Some(cap) => {
-                    let snip = buf.replace("let var_name", "let $0var_name");
-                    edit.replace_snippet(cap, offset, snip)
+                    let snip =
+                        buf.replace(&format!("let {}", var_name), &format!("let $0{}", var_name));
+                    edit.replace_snippet(cap, expr_range, snip)
                 }
-                None => edit.replace(offset, buf),
+                None => edit.replace(expr_range, buf),
             }
             return;
         }
@@ -88,11 +102,12 @@ pub(crate) fn introduce_variable(acc: &mut Assists, ctx: &AssistContext) -> Opti
             buf.push_str(text);
         }
 
-        edit.replace(expr.syntax().text_range(), "var_name".to_string());
+        edit.replace(expr_range, var_name.clone());
         let offset = anchor_stmt.text_range().start();
         match ctx.config.snippet_cap {
             Some(cap) => {
-                let snip = buf.replace("let var_name", "let $0var_name");
+                let snip =
+                    buf.replace(&format!("let {}", var_name), &format!("let $0{}", var_name));
                 edit.insert_snippet(cap, offset, snip)
             }
             None => edit.insert(offset, buf),
@@ -226,27 +241,31 @@ fn foo() {
         mark::check!(test_introduce_var_last_expr);
         check_assist(
             introduce_variable,
-            "
+            r#"
 fn foo() {
     bar(<|>1 + 1<|>)
-}",
-            "
+}
+"#,
+            r#"
 fn foo() {
     let $0var_name = 1 + 1;
     bar(var_name)
-}",
+}
+"#,
         );
         check_assist(
             introduce_variable,
-            "
+            r#"
 fn foo() {
     <|>bar(1 + 1)<|>
-}",
-            "
+}
+"#,
+            r#"
 fn foo() {
     let $0var_name = bar(1 + 1);
     var_name
-}",
+}
+"#,
         )
     }
 
@@ -500,6 +519,32 @@ fn main() {
     }
 
     #[test]
+    fn introduce_var_field_shorthand() {
+        check_assist(
+            introduce_variable,
+            r#"
+struct S {
+    foo: i32
+}
+
+fn main() {
+    S { foo: <|>1 + 1<|> }
+}
+"#,
+            r#"
+struct S {
+    foo: i32
+}
+
+fn main() {
+    let $0foo = 1 + 1;
+    S { foo }
+}
+"#,
+        )
+    }
+
+    #[test]
     fn test_introduce_var_for_return_not_applicable() {
         check_assist_not_applicable(introduce_variable, "fn foo() { <|>return<|>; } ");
     }
diff --git a/crates/ra_assists/src/handlers/merge_imports.rs b/crates/ra_assists/src/handlers/merge_imports.rs
index 972d16241..ac0b3035c 100644
--- a/crates/ra_assists/src/handlers/merge_imports.rs
+++ b/crates/ra_assists/src/handlers/merge_imports.rs
@@ -127,7 +127,7 @@ fn first_path(path: &ast::Path) -> ast::Path {
 
 #[cfg(test)]
 mod tests {
-    use crate::tests::check_assist;
+    use crate::tests::{check_assist, check_assist_not_applicable};
 
     use super::*;
 
@@ -276,4 +276,14 @@ bar::baz};
 ",
         )
     }
+
+    #[test]
+    fn test_empty_use() {
+        check_assist_not_applicable(
+            merge_imports,
+            r"
+use std::<|>
+fn main() {}",
+        );
+    }
 }
diff --git a/crates/ra_assists/src/handlers/raw_string.rs b/crates/ra_assists/src/handlers/raw_string.rs
index 16002d2ac..d22d0aa55 100644
--- a/crates/ra_assists/src/handlers/raw_string.rs
+++ b/crates/ra_assists/src/handlers/raw_string.rs
@@ -158,16 +158,16 @@ mod test {
         check_assist(
             make_raw_string,
             r#"
-            fn f() {
-                let s = <|>"random\nstring";
-            }
-            "#,
+fn f() {
+    let s = <|>"random\nstring";
+}
+"#,
             r##"
-            fn f() {
-                let s = r#"random
+fn f() {
+    let s = r#"random
 string"#;
-            }
-            "##,
+}
+"##,
         )
     }
 
@@ -193,16 +193,16 @@ string"#;
         check_assist(
             make_raw_string,
             r###"
-            fn f() {
-                let s = <|>"#random##\nstring";
-            }
-            "###,
+fn f() {
+    let s = <|>"#random##\nstring";
+}
+"###,
             r####"
-            fn f() {
-                let s = r#"#random##
+fn f() {
+    let s = r#"#random##
 string"#;
-            }
-            "####,
+}
+"####,
         )
     }
 
@@ -211,16 +211,16 @@ string"#;
         check_assist(
             make_raw_string,
             r###"
-            fn f() {
-                let s = <|>"#random\"##\nstring";
-            }
-            "###,
+fn f() {
+    let s = <|>"#random\"##\nstring";
+}
+"###,
             r####"
-            fn f() {
-                let s = r###"#random"##
+fn f() {
+    let s = r###"#random"##
 string"###;
-            }
-            "####,
+}
+"####,
         )
     }
 
diff --git a/crates/ra_assists/src/handlers/split_import.rs b/crates/ra_assists/src/handlers/split_import.rs
index c7a874480..38aa199a0 100644
--- a/crates/ra_assists/src/handlers/split_import.rs
+++ b/crates/ra_assists/src/handlers/split_import.rs
@@ -66,4 +66,14 @@ mod tests {
     fn issue4044() {
         check_assist_not_applicable(split_import, "use crate::<|>:::self;")
     }
+
+    #[test]
+    fn test_empty_use() {
+        check_assist_not_applicable(
+            split_import,
+            r"
+use std::<|>
+fn main() {}",
+        );
+    }
 }
diff --git a/crates/ra_assists/src/tests.rs b/crates/ra_assists/src/tests.rs
index 62dd3547f..858f5ca80 100644
--- a/crates/ra_assists/src/tests.rs
+++ b/crates/ra_assists/src/tests.rs
@@ -1,27 +1,21 @@
 mod generated;
 
-use std::sync::Arc;
-
 use hir::Semantics;
 use ra_db::{fixture::WithFixture, FileId, FileRange, SourceDatabaseExt};
-use ra_ide_db::{symbol_index::SymbolsDatabase, RootDatabase};
+use ra_ide_db::RootDatabase;
 use ra_syntax::TextRange;
-use test_utils::{
-    assert_eq_text, extract_offset, extract_range, extract_range_or_offset, RangeOrOffset,
-};
+use test_utils::{assert_eq_text, extract_offset, extract_range};
 
 use crate::{handlers::Handler, Assist, AssistConfig, AssistContext, Assists};
+use stdx::trim_indent;
 
 pub(crate) fn with_single_file(text: &str) -> (RootDatabase, FileId) {
-    let (mut db, file_id) = RootDatabase::with_single_file(text);
-    // FIXME: ideally, this should be done by the above `RootDatabase::with_single_file`,
-    // but it looks like this might need specialization? :(
-    db.set_local_roots(Arc::new(vec![db.file_source_root(file_id)]));
-    (db, file_id)
+    RootDatabase::with_single_file(text)
 }
 
 pub(crate) fn check_assist(assist: Handler, ra_fixture_before: &str, ra_fixture_after: &str) {
-    check(assist, ra_fixture_before, ExpectedResult::After(ra_fixture_after));
+    let ra_fixture_after = trim_indent(ra_fixture_after);
+    check(assist, ra_fixture_before, ExpectedResult::After(&ra_fixture_after));
 }
 
 // FIXME: instead of having a separate function here, maybe use
@@ -36,8 +30,9 @@ pub(crate) fn check_assist_not_applicable(assist: Handler, ra_fixture: &str) {
 }
 
 fn check_doc_test(assist_id: &str, before: &str, after: &str) {
-    let (selection, before) = extract_range_or_offset(before);
-    let (db, file_id) = crate::tests::with_single_file(&before);
+    let after = trim_indent(after);
+    let (db, file_id, selection) = RootDatabase::with_range_or_offset(&before);
+    let before = db.file_text(file_id).to_string();
     let frange = FileRange { file_id, range: selection.into() };
 
     let mut assist = Assist::resolved(&db, &AssistConfig::default(), frange)
@@ -57,11 +52,11 @@ fn check_doc_test(assist_id: &str, before: &str, after: &str) {
 
     let actual = {
         let change = assist.source_change.source_file_edits.pop().unwrap();
-        let mut actual = before.clone();
+        let mut actual = before;
         change.edit.apply(&mut actual);
         actual
     };
-    assert_eq_text!(after, &actual);
+    assert_eq_text!(&after, &actual);
 }
 
 enum ExpectedResult<'a> {
@@ -71,20 +66,8 @@ enum ExpectedResult<'a> {
 }
 
 fn check(handler: Handler, before: &str, expected: ExpectedResult) {
-    let (text_without_caret, file_with_caret_id, range_or_offset, db) = if before.contains("//-") {
-        let (mut db, position) = RootDatabase::with_position(before);
-        db.set_local_roots(Arc::new(vec![db.file_source_root(position.file_id)]));
-        (
-            db.file_text(position.file_id).as_ref().to_owned(),
-            position.file_id,
-            RangeOrOffset::Offset(position.offset),
-            db,
-        )
-    } else {
-        let (range_or_offset, text_without_caret) = extract_range_or_offset(before);
-        let (db, file_id) = with_single_file(&text_without_caret);
-        (text_without_caret, file_id, range_or_offset, db)
-    };
+    let (db, file_with_caret_id, range_or_offset) = RootDatabase::with_range_or_offset(before);
+    let text_without_caret = db.file_text(file_with_caret_id).to_string();
 
     let frange = FileRange { file_id: file_with_caret_id, range: range_or_offset.into() };
 
diff --git a/crates/ra_assists/src/utils.rs b/crates/ra_assists/src/utils.rs
index c1ff0de7b..b7c45a619 100644
--- a/crates/ra_assists/src/utils.rs
+++ b/crates/ra_assists/src/utils.rs
@@ -198,8 +198,7 @@ pub(crate) struct FamousDefs<'a, 'b>(pub(crate) &'a Semantics<'b, RootDatabase>,
 #[allow(non_snake_case)]
 impl FamousDefs<'_, '_> {
     #[cfg(test)]
-    pub(crate) const FIXTURE: &'static str = r#"
-//- /libcore.rs crate:core
+    pub(crate) const FIXTURE: &'static str = r#"//- /libcore.rs crate:core
 pub mod convert {
     pub trait From<T> {
         fn from(T) -> Self;