7 files changed, 212 insertions, 19 deletions

diff --git a/crates/ra_cfg/src/cfg_expr.rs b/crates/ra_cfg/src/cfg_expr.rs
index 39d71851c..a4b201e0e 100644
--- a/crates/ra_cfg/src/cfg_expr.rs
+++ b/crates/ra_cfg/src/cfg_expr.rs
@@ -33,6 +33,36 @@ impl CfgExpr {
             CfgExpr::Not(pred) => pred.fold(query).map(|s| !s),
         }
     }
+
+    /// Return minimal features needed
+    pub fn minimal_features_needed(&self) -> Option<Vec<SmolStr>> {
+        let mut features = vec![];
+        self.collect_minimal_features_needed(&mut features);
+        if features.is_empty() {
+            None
+        } else {
+            Some(features)
+        }
+    }
+
+    fn collect_minimal_features_needed(&self, features: &mut Vec<SmolStr>) {
+        match self {
+            CfgExpr::KeyValue { key, value } if key == "feature" => features.push(value.clone()),
+            CfgExpr::All(preds) => {
+                preds.iter().for_each(|cfg| cfg.collect_minimal_features_needed(features));
+            }
+            CfgExpr::Any(preds) => {
+                for cfg in preds {
+                    let len_features = features.len();
+                    cfg.collect_minimal_features_needed(features);
+                    if len_features != features.len() {
+                        break;
+                    }
+                }
+            }
+            _ => {}
+        }
+    }
 }
 
 pub fn parse_cfg(tt: &Subtree) -> CfgExpr {
@@ -88,13 +118,17 @@ fn next_cfg_expr(it: &mut SliceIter<tt::TokenTree>) -> Option<CfgExpr> {
 mod tests {
     use super::*;
 
-    use mbe::ast_to_token_tree;
+    use mbe::{ast_to_token_tree, TokenMap};
     use ra_syntax::ast::{self, AstNode};
 
-    fn assert_parse_result(input: &str, expected: CfgExpr) {
+    fn get_token_tree_generated(input: &str) -> (tt::Subtree, TokenMap) {
         let source_file = ast::SourceFile::parse(input).ok().unwrap();
         let tt = source_file.syntax().descendants().find_map(ast::TokenTree::cast).unwrap();
-        let (tt, _) = ast_to_token_tree(&tt).unwrap();
+        ast_to_token_tree(&tt).unwrap()
+    }
+
+    fn assert_parse_result(input: &str, expected: CfgExpr) {
+        let (tt, _) = get_token_tree_generated(input);
         assert_eq!(parse_cfg(&tt), expected);
     }
 
@@ -129,4 +163,32 @@ mod tests {
             ]),
         );
     }
+
+    #[test]
+    fn test_cfg_expr_minimal_features_needed() {
+        let (subtree, _) = get_token_tree_generated(r#"#![cfg(feature = "baz")]"#);
+        let cfg_expr = parse_cfg(&subtree);
+
+        assert_eq!(cfg_expr.minimal_features_needed().unwrap(), vec![SmolStr::new("baz")]);
+
+        let (subtree, _) =
+            get_token_tree_generated(r#"#![cfg(all(feature = "baz", feature = "foo"))]"#);
+        let cfg_expr = parse_cfg(&subtree);
+
+        assert_eq!(
+            cfg_expr.minimal_features_needed().unwrap(),
+            vec![SmolStr::new("baz"), SmolStr::new("foo")]
+        );
+
+        let (subtree, _) =
+            get_token_tree_generated(r#"#![cfg(any(feature = "baz", feature = "foo", unix))]"#);
+        let cfg_expr = parse_cfg(&subtree);
+
+        assert_eq!(cfg_expr.minimal_features_needed().unwrap(), vec![SmolStr::new("baz")]);
+
+        let (subtree, _) = get_token_tree_generated(r#"#![cfg(foo)]"#);
+        let cfg_expr = parse_cfg(&subtree);
+
+        assert!(cfg_expr.minimal_features_needed().is_none());
+    }
 }
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index c5df4ac24..3364a822f 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -62,6 +62,7 @@ pub use crate::{
 
 pub use hir_def::{
     adt::StructKind,
+    attr::Attrs,
     body::scope::ExprScopes,
     builtin_type::BuiltinType,
     docs::Documentation,
diff --git a/crates/ra_hir_def/src/attr.rs b/crates/ra_hir_def/src/attr.rs
index 576cd0c65..8b6c0bede 100644
--- a/crates/ra_hir_def/src/attr.rs
+++ b/crates/ra_hir_def/src/attr.rs
@@ -81,7 +81,7 @@ impl Attrs {
         }
     }
 
-    fn from_attrs_owner(db: &dyn DefDatabase, owner: InFile<&dyn AttrsOwner>) -> Attrs {
+    pub fn from_attrs_owner(db: &dyn DefDatabase, owner: InFile<&dyn AttrsOwner>) -> Attrs {
         let hygiene = Hygiene::new(db.upcast(), owner.file_id);
         Attrs::new(owner.value, &hygiene)
     }
diff --git a/crates/ra_hir_def/src/body.rs b/crates/ra_hir_def/src/body.rs
index f5a7305dc..273036cee 100644
--- a/crates/ra_hir_def/src/body.rs
+++ b/crates/ra_hir_def/src/body.rs
@@ -29,7 +29,7 @@ use crate::{
     AsMacroCall, DefWithBodyId, HasModule, Lookup, ModuleId,
 };
 
-/// A subset of Exander that only deals with cfg attributes. We only need it to
+/// A subset of Expander that only deals with cfg attributes. We only need it to
 /// avoid cyclic queries in crate def map during enum processing.
 pub(crate) struct CfgExpander {
     cfg_options: CfgOptions,
diff --git a/crates/ra_ide/src/runnables.rs b/crates/ra_ide/src/runnables.rs
index fa8a9d92c..4f7eb2c5b 100644
--- a/crates/ra_ide/src/runnables.rs
+++ b/crates/ra_ide/src/runnables.rs
@@ -1,11 +1,11 @@
 //! FIXME: write short doc here
 
-use hir::Semantics;
+use hir::{Attrs, HirFileId, InFile, Semantics};
 use itertools::Itertools;
 use ra_ide_db::RootDatabase;
 use ra_syntax::{
     ast::{self, AstNode, AttrsOwner, ModuleItemOwner, NameOwner},
-    match_ast, SyntaxNode, TextRange,
+    match_ast, SmolStr, SyntaxNode, TextRange,
 };
 
 use crate::FileId;
@@ -16,6 +16,7 @@ use std::fmt::Display;
 pub struct Runnable {
     pub range: TextRange,
     pub kind: RunnableKind,
+    pub features_needed: Option<Vec<SmolStr>>,
 }
 
 #[derive(Debug)]
@@ -45,20 +46,24 @@ pub enum RunnableKind {
 pub(crate) fn runnables(db: &RootDatabase, file_id: FileId) -> Vec<Runnable> {
     let sema = Semantics::new(db);
     let source_file = sema.parse(file_id);
-    source_file.syntax().descendants().filter_map(|i| runnable(&sema, i)).collect()
+    source_file.syntax().descendants().filter_map(|i| runnable(&sema, i, file_id)).collect()
 }
 
-fn runnable(sema: &Semantics<RootDatabase>, item: SyntaxNode) -> Option<Runnable> {
+fn runnable(sema: &Semantics<RootDatabase>, item: SyntaxNode, file_id: FileId) -> Option<Runnable> {
     match_ast! {
         match item {
-            ast::FnDef(it) => runnable_fn(sema, it),
-            ast::Module(it) => runnable_mod(sema, it),
+            ast::FnDef(it) => runnable_fn(sema, it, file_id),
+            ast::Module(it) => runnable_mod(sema, it, file_id),
             _ => None,
         }
     }
 }
 
-fn runnable_fn(sema: &Semantics<RootDatabase>, fn_def: ast::FnDef) -> Option<Runnable> {
+fn runnable_fn(
+    sema: &Semantics<RootDatabase>,
+    fn_def: ast::FnDef,
+    file_id: FileId,
+) -> Option<Runnable> {
     let name_string = fn_def.name()?.text().to_string();
 
     let kind = if name_string == "main" {
@@ -89,7 +94,11 @@ fn runnable_fn(sema: &Semantics<RootDatabase>, fn_def: ast::FnDef) -> Option<Run
             return None;
         }
     };
-    Some(Runnable { range: fn_def.syntax().text_range(), kind })
+
+    let attrs = Attrs::from_attrs_owner(sema.db, InFile::new(HirFileId::from(file_id), &fn_def));
+    let features_needed = get_features_needed(attrs);
+
+    Some(Runnable { range: fn_def.syntax().text_range(), kind, features_needed })
 }
 
 #[derive(Debug)]
@@ -125,7 +134,11 @@ fn has_doc_test(fn_def: &ast::FnDef) -> bool {
     fn_def.doc_comment_text().map_or(false, |comment| comment.contains("```"))
 }
 
-fn runnable_mod(sema: &Semantics<RootDatabase>, module: ast::Module) -> Option<Runnable> {
+fn runnable_mod(
+    sema: &Semantics<RootDatabase>,
+    module: ast::Module,
+    file_id: FileId,
+) -> Option<Runnable> {
     let has_test_function = module
         .item_list()?
         .items()
@@ -138,11 +151,34 @@ fn runnable_mod(sema: &Semantics<RootDatabase>, module: ast::Module) -> Option<R
         return None;
     }
     let range = module.syntax().text_range();
-    let module = sema.to_def(&module)?;
+    let module_def = sema.to_def(&module)?;
+
+    let path = module_def
+        .path_to_root(sema.db)
+        .into_iter()
+        .rev()
+        .filter_map(|it| it.name(sema.db))
+        .join("::");
+
+    let attrs = Attrs::from_attrs_owner(sema.db, InFile::new(HirFileId::from(file_id), &module));
+    let features_needed = get_features_needed(attrs);
 
-    let path =
-        module.path_to_root(sema.db).into_iter().rev().filter_map(|it| it.name(sema.db)).join("::");
-    Some(Runnable { range, kind: RunnableKind::TestMod { path } })
+    Some(Runnable { range, kind: RunnableKind::TestMod { path }, features_needed })
+}
+
+fn get_features_needed(attrs: Attrs) -> Option<Vec<SmolStr>> {
+    let cfg_expr = attrs.by_key("cfg").tt_values().map(|subtree| ra_cfg::parse_cfg(subtree));
+    let features_needed = cfg_expr.fold(vec![], |mut acc, cfg| {
+        if let Some(features_needed) = cfg.minimal_features_needed() {
+            acc.extend(features_needed);
+        }
+        acc
+    });
+    if features_needed.is_empty() {
+        None
+    } else {
+        Some(features_needed)
+    }
 }
 
 #[cfg(test)]
@@ -174,6 +210,7 @@ mod tests {
             Runnable {
                 range: 1..21,
                 kind: Bin,
+                features_needed: None,
             },
             Runnable {
                 range: 22..46,
@@ -185,6 +222,7 @@ mod tests {
                         ignore: false,
                     },
                 },
+                features_needed: None,
             },
             Runnable {
                 range: 47..81,
@@ -196,6 +234,7 @@ mod tests {
                         ignore: true,
                     },
                 },
+                features_needed: None,
             },
         ]
         "###
@@ -223,6 +262,7 @@ mod tests {
             Runnable {
                 range: 1..21,
                 kind: Bin,
+                features_needed: None,
             },
             Runnable {
                 range: 22..64,
@@ -231,6 +271,7 @@ mod tests {
                         "foo",
                     ),
                 },
+                features_needed: None,
             },
         ]
         "###
@@ -258,6 +299,7 @@ mod tests {
                 kind: TestMod {
                     path: "test_mod",
                 },
+                features_needed: None,
             },
             Runnable {
                 range: 28..57,
@@ -269,6 +311,7 @@ mod tests {
                         ignore: false,
                     },
                 },
+                features_needed: None,
             },
         ]
         "###
@@ -298,6 +341,7 @@ mod tests {
                 kind: TestMod {
                     path: "foo::test_mod",
                 },
+                features_needed: None,
             },
             Runnable {
                 range: 46..79,
@@ -309,6 +353,7 @@ mod tests {
                         ignore: false,
                     },
                 },
+                features_needed: None,
             },
         ]
         "###
@@ -340,6 +385,7 @@ mod tests {
                 kind: TestMod {
                     path: "foo::bar::test_mod",
                 },
+                features_needed: None,
             },
             Runnable {
                 range: 68..105,
@@ -351,6 +397,80 @@ mod tests {
                         ignore: false,
                     },
                 },
+                features_needed: None,
+            },
+        ]
+        "###
+                );
+    }
+
+    #[test]
+    fn test_runnables_with_feature() {
+        let (analysis, pos) = analysis_and_position(
+            r#"
+        //- /lib.rs crate:foo cfg:feature=foo
+        <|> //empty
+        #[test]
+        #[cfg(feature = "foo")]
+        fn test_foo1() {}
+        "#,
+        );
+        let runnables = analysis.runnables(pos.file_id).unwrap();
+        assert_debug_snapshot!(&runnables,
+        @r###"
+        [
+            Runnable {
+                range: 1..58,
+                kind: Test {
+                    test_id: Name(
+                        "test_foo1",
+                    ),
+                    attr: TestAttr {
+                        ignore: false,
+                    },
+                },
+                features_needed: Some(
+                    [
+                        "foo",
+                    ],
+                ),
+            },
+        ]
+        "###
+                );
+    }
+
+    #[test]
+    fn test_runnables_with_features() {
+        let (analysis, pos) = analysis_and_position(
+            r#"
+        //- /lib.rs crate:foo cfg:feature=foo,feature=bar
+        <|> //empty
+        #[test]
+        #[cfg(all(feature = "foo", feature = "bar"))]
+        fn test_foo1() {}
+        "#,
+        );
+        let runnables = analysis.runnables(pos.file_id).unwrap();
+        assert_debug_snapshot!(&runnables,
+        @r###"
+        [
+            Runnable {
+                range: 1..80,
+                kind: Test {
+                    test_id: Name(
+                        "test_foo1",
+                    ),
+                    attr: TestAttr {
+                        ignore: false,
+                    },
+                },
+                features_needed: Some(
+                    [
+                        "foo",
+                        "bar",
+                    ],
+                ),
             },
         ]
         "###
diff --git a/crates/rust-analyzer/src/cargo_target_spec.rs b/crates/rust-analyzer/src/cargo_target_spec.rs
index 5e5a17943..a2f85060b 100644
--- a/crates/rust-analyzer/src/cargo_target_spec.rs
+++ b/crates/rust-analyzer/src/cargo_target_spec.rs
@@ -4,6 +4,7 @@ use ra_ide::{FileId, RunnableKind, TestId};
 use ra_project_model::{self, ProjectWorkspace, TargetKind};
 
 use crate::{world::WorldSnapshot, Result};
+use ra_syntax::SmolStr;
 
 /// Abstract representation of Cargo target.
 ///
@@ -20,6 +21,7 @@ impl CargoTargetSpec {
     pub(crate) fn runnable_args(
         spec: Option<CargoTargetSpec>,
         kind: &RunnableKind,
+        features_needed: &Option<Vec<SmolStr>>,
     ) -> Result<(Vec<String>, Vec<String>)> {
         let mut args = Vec::new();
         let mut extra_args = Vec::new();
@@ -73,6 +75,13 @@ impl CargoTargetSpec {
                 }
             }
         }
+
+        if let Some(features_needed) = features_needed {
+            features_needed.iter().for_each(|feature| {
+                args.push("--features".to_string());
+                args.push(feature.to_string());
+            });
+        }
         Ok((args, extra_args))
     }
 
diff --git a/crates/rust-analyzer/src/main_loop/handlers.rs b/crates/rust-analyzer/src/main_loop/handlers.rs
index 6b14830b6..0232cc6f0 100644
--- a/crates/rust-analyzer/src/main_loop/handlers.rs
+++ b/crates/rust-analyzer/src/main_loop/handlers.rs
@@ -1012,7 +1012,8 @@ fn to_lsp_runnable(
 ) -> Result<lsp_ext::Runnable> {
     let spec = CargoTargetSpec::for_file(world, file_id)?;
     let target = spec.as_ref().map(|s| s.target.clone());
-    let (args, extra_args) = CargoTargetSpec::runnable_args(spec, &runnable.kind)?;
+    let (args, extra_args) =
+        CargoTargetSpec::runnable_args(spec, &runnable.kind, &runnable.features_needed)?;
     let line_index = world.analysis().file_line_index(file_id)?;
     let label = match &runnable.kind {
         RunnableKind::Test { test_id, .. } => format!("test {}", test_id),