5 files changed, 63 insertions, 123 deletions

diff --git a/crates/ra_analysis/Cargo.toml b/crates/ra_analysis/Cargo.toml
index a5d4f65ab..c0174cdc5 100644
--- a/crates/ra_analysis/Cargo.toml
+++ b/crates/ra_analysis/Cargo.toml
@@ -5,6 +5,7 @@ version = "0.1.0"
 authors = ["Aleksey Kladov <[email protected]>"]
 
 [dependencies]
+itertools = "0.8.0"
 log = "0.4.5"
 relative-path = "0.4.0"
 rayon = "1.0.2"
@@ -12,6 +13,7 @@ fst = "0.3.1"
 salsa = "0.9.0"
 rustc-hash = "1.0"
 parking_lot = "0.7.0"
+
 ra_syntax = { path = "../ra_syntax" }
 ra_editor = { path = "../ra_editor" }
 ra_text_edit = { path = "../ra_text_edit" }
diff --git a/crates/ra_analysis/src/imp.rs b/crates/ra_analysis/src/imp.rs
index 0faf8b85d..ff13247de 100644
--- a/crates/ra_analysis/src/imp.rs
+++ b/crates/ra_analysis/src/imp.rs
@@ -100,27 +100,6 @@ impl db::RootDatabase {
 }
 
 impl db::RootDatabase {
-    pub(crate) fn module_path(&self, position: FilePosition) -> Cancelable<Option<String>> {
-        let descr = match source_binder::module_from_position(self, position)? {
-            None => return Ok(None),
-            Some(it) => it,
-        };
-        let name = match descr.name() {
-            None => return Ok(None),
-            Some(it) => it.to_string(),
-        };
-
-        let modules = descr.path_to_root();
-
-        let path = modules
-            .iter()
-            .filter_map(|s| s.name())
-            .skip(1) // name is already part of the string.
-            .fold(name, |path, it| format!("{}::{}", it, path));
-
-        Ok(Some(path.to_string()))
-    }
-
     /// This returns `Vec` because a module may be included from several places. We
     /// don't handle this case yet though, so the Vec has length at most one.
     pub(crate) fn parent_module(
diff --git a/crates/ra_analysis/src/lib.rs b/crates/ra_analysis/src/lib.rs
index 54eb2f4d3..a01febf4e 100644
--- a/crates/ra_analysis/src/lib.rs
+++ b/crates/ra_analysis/src/lib.rs
@@ -382,10 +382,6 @@ impl Analysis {
     pub fn parent_module(&self, position: FilePosition) -> Cancelable<Vec<NavigationTarget>> {
         self.db.parent_module(position)
     }
-    /// Returns `::` separated path to the current module from the crate root.
-    pub fn module_path(&self, position: FilePosition) -> Cancelable<Option<String>> {
-        self.db.module_path(position)
-    }
     /// Returns crates this file belongs too.
     pub fn crate_for(&self, file_id: FileId) -> Cancelable<Vec<CrateId>> {
         self.db.crate_for(file_id)
@@ -396,8 +392,7 @@ impl Analysis {
     }
     /// Returns the set of possible targets to run for the current file.
     pub fn runnables(&self, file_id: FileId) -> Cancelable<Vec<Runnable>> {
-        let file = self.db.source_file(file_id);
-        Ok(runnables::runnables(self, &file, file_id))
+        runnables::runnables(&*self.db, file_id)
     }
     /// Computes syntax highlighting for the given file.
     pub fn highlight(&self, file_id: FileId) -> Cancelable<Vec<HighlightedRange>> {
diff --git a/crates/ra_analysis/src/runnables.rs b/crates/ra_analysis/src/runnables.rs
index 61ca0930a..474267605 100644
--- a/crates/ra_analysis/src/runnables.rs
+++ b/crates/ra_analysis/src/runnables.rs
@@ -1,11 +1,11 @@
+use itertools::Itertools;
 use ra_syntax::{
     ast::{self, AstNode, NameOwner, ModuleItemOwner},
-    SourceFileNode, TextRange, SyntaxNodeRef,
-    TextUnit,
-};
-use crate::{
-    Analysis, FileId, FilePosition
+    TextRange, SyntaxNodeRef,
 };
+use ra_db::{Cancelable, SyntaxDatabase};
+
+use crate::{db::RootDatabase, FileId};
 
 #[derive(Debug)]
 pub struct Runnable {
@@ -20,53 +20,67 @@ pub enum RunnableKind {
     Bin,
 }
 
-pub fn runnables(
-    analysis: &Analysis,
-    file_node: &SourceFileNode,
-    file_id: FileId,
-) -> Vec<Runnable> {
-    file_node
+pub(crate) fn runnables(db: &RootDatabase, file_id: FileId) -> Cancelable<Vec<Runnable>> {
+    let source_file = db.source_file(file_id);
+    let res = source_file
         .syntax()
         .descendants()
-        .filter_map(|i| runnable(analysis, i, file_id))
-        .collect()
+        .filter_map(|i| runnable(db, file_id, i))
+        .collect();
+    Ok(res)
 }
 
-fn runnable<'a>(analysis: &Analysis, item: SyntaxNodeRef<'a>, file_id: FileId) -> Option<Runnable> {
-    if let Some(f) = ast::FnDef::cast(item) {
-        let name = f.name()?.text();
-        let kind = if name == "main" {
-            RunnableKind::Bin
-        } else if f.has_atom_attr("test") {
-            RunnableKind::Test {
-                name: name.to_string(),
-            }
-        } else {
-            return None;
-        };
-        Some(Runnable {
-            range: f.syntax().range(),
-            kind,
-        })
+fn runnable(db: &RootDatabase, file_id: FileId, item: SyntaxNodeRef) -> Option<Runnable> {
+    if let Some(fn_def) = ast::FnDef::cast(item) {
+        runnable_fn(fn_def)
     } else if let Some(m) = ast::Module::cast(item) {
-        if m.item_list()?
-            .items()
-            .map(ast::ModuleItem::syntax)
-            .filter_map(ast::FnDef::cast)
-            .any(|f| f.has_atom_attr("test"))
-        {
-            let postition = FilePosition {
-                file_id,
-                offset: m.syntax().range().start() + TextUnit::from_usize(1),
-            };
-            analysis.module_path(postition).ok()?.map(|path| Runnable {
-                range: m.syntax().range(),
-                kind: RunnableKind::TestMod { path },
-            })
-        } else {
-            None
-        }
+        runnable_mod(db, file_id, m)
     } else {
         None
     }
 }
+
+fn runnable_fn(fn_def: ast::FnDef) -> Option<Runnable> {
+    let name = fn_def.name()?.text();
+    let kind = if name == "main" {
+        RunnableKind::Bin
+    } else if fn_def.has_atom_attr("test") {
+        RunnableKind::Test {
+            name: name.to_string(),
+        }
+    } else {
+        return None;
+    };
+    Some(Runnable {
+        range: fn_def.syntax().range(),
+        kind,
+    })
+}
+
+fn runnable_mod(db: &RootDatabase, file_id: FileId, module: ast::Module) -> Option<Runnable> {
+    let has_test_function = module
+        .item_list()?
+        .items()
+        .filter_map(|it| match it {
+            ast::ModuleItem::FnDef(it) => Some(it),
+            _ => None,
+        })
+        .any(|f| f.has_atom_attr("test"));
+    if !has_test_function {
+        return None;
+    }
+    let range = module.syntax().range();
+    let module =
+        hir::source_binder::module_from_child_node(db, file_id, module.syntax()).ok()??;
+    let path = module
+        .path_to_root()
+        .into_iter()
+        .rev()
+        .into_iter()
+        .filter_map(|it| it.name().map(Clone::clone))
+        .join("::");
+    Some(Runnable {
+        range,
+        kind: RunnableKind::TestMod { path },
+    })
+}
diff --git a/crates/ra_analysis/tests/tests.rs b/crates/ra_analysis/tests/tests.rs
index 845fff3c6..3045c2e78 100644
--- a/crates/ra_analysis/tests/tests.rs
+++ b/crates/ra_analysis/tests/tests.rs
@@ -132,56 +132,6 @@ fn test_resolve_parent_module_for_inline() {
 }
 
 #[test]
-fn test_path_one_layer() {
-    let (analysis, pos) = analysis_and_position(
-        "
-        //- /lib.rs
-        mod foo;
-        //- /foo/mod.rs
-        mod bla;
-        //- /foo/bla.rs
-        <|> //empty
-    ",
-    );
-    let symbols = analysis.module_path(pos).unwrap().unwrap();
-    assert_eq!("foo::bla", &symbols);
-}
-
-#[test]
-fn test_path_two_layer() {
-    let (analysis, pos) = analysis_and_position(
-        "
-        //- /lib.rs
-        mod foo;
-        //- /foo/mod.rs
-        mod bla;
-        //- /foo/bla/mod.rs
-        mod more;
-        //- /foo/bla/more.rs
-        <|> //empty
-    ",
-    );
-    let symbols = analysis.module_path(pos).unwrap().unwrap();
-    assert_eq!("foo::bla::more", &symbols);
-}
-
-#[test]
-fn test_path_in_file_mod() {
-    let (analysis, pos) = analysis_and_position(
-        "
-        //- /lib.rs
-        mod foo;
-        //- /foo.rs
-        mod bar {
-            <|> //empty
-        }
-    ",
-    );
-    let symbols = analysis.module_path(pos).unwrap().unwrap();
-    assert_eq!("foo::bar", &symbols);
-}
-
-#[test]
 fn test_resolve_crate_root() {
     let mock = MockAnalysis::with_files(
         "