8 files changed, 82 insertions, 19 deletions

diff --git a/crates/assert_eq_text/Cargo.toml b/crates/assert_eq_text/Cargo.toml
index 21858dfd3..e122bbbeb 100644
--- a/crates/assert_eq_text/Cargo.toml
+++ b/crates/assert_eq_text/Cargo.toml
@@ -5,3 +5,4 @@ authors = ["Aleksey Kladov <[email protected]>"]
 
 [dependencies]
 difference = "2.0.0"
+itertools = "0.7.8"
diff --git a/crates/assert_eq_text/src/lib.rs b/crates/assert_eq_text/src/lib.rs
index ed942d81a..26b9bfb38 100644
--- a/crates/assert_eq_text/src/lib.rs
+++ b/crates/assert_eq_text/src/lib.rs
@@ -1,4 +1,9 @@
 extern crate difference;
+extern crate itertools;
+
+use std::fmt;
+use itertools::Itertools;
+
 pub use self::difference::Changeset as __Changeset;
 
 #[macro_export]
@@ -23,3 +28,9 @@ macro_rules! assert_eq_text {
         }
     }};
 }
+
+pub fn assert_eq_dbg(expected: &str, actual: &impl fmt::Debug) {
+    let actual = format!("{:?}", actual);
+    let expected = expected.lines().map(|l| l.trim()).join(" ");
+    assert_eq!(expected, actual);
+}
diff --git a/crates/libanalysis/Cargo.toml b/crates/libanalysis/Cargo.toml
index 42a5aca14..fa859ff94 100644
--- a/crates/libanalysis/Cargo.toml
+++ b/crates/libanalysis/Cargo.toml
@@ -12,3 +12,6 @@ rayon = "1.0.2"
 fst = { git = "https://github.com/matklad/fst", branch = "subsequence"}
 libsyntax2 = { path = "../libsyntax2" }
 libeditor = { path = "../libeditor" }
+
+[dev-dependencies]
+assert_eq_text = { path = "../assert_eq_text" }
diff --git a/crates/libanalysis/src/lib.rs b/crates/libanalysis/src/lib.rs
index 19b64fece..a50a0f32f 100644
--- a/crates/libanalysis/src/lib.rs
+++ b/crates/libanalysis/src/lib.rs
@@ -163,15 +163,21 @@ impl World {
             Some(name) => name.text(),
             None => return Vec::new(),
         };
-        let id = match self.resolve_relative_path(id, &PathBuf::from(format!("../{}.rs", name))) {
-            Some(id) => id,
-            None => return Vec::new(),
-        };
-        vec![(id, FileSymbol {
-            name: name.clone(),
-            node_range: TextRange::offset_len(0.into(), 0.into()),
-            kind: MODULE,
-        })]
+        let paths = &[
+            PathBuf::from(format!("../{}.rs", name)),
+            PathBuf::from(format!("../{}/mod.rs", name)),
+        ];
+        paths.iter()
+            .filter_map(|path| self.resolve_relative_path(id, path))
+            .map(|id| {
+                let symbol = FileSymbol {
+                    name: name.clone(),
+                    node_range: TextRange::offset_len(0.into(), 0.into()),
+                    kind: MODULE,
+                };
+                (id, symbol)
+            })
+            .collect()
     }
 
     fn resolve_relative_path(&self, id: FileId, path: &Path) -> Option<FileId> {
diff --git a/crates/libanalysis/tests/tests.rs b/crates/libanalysis/tests/tests.rs
new file mode 100644
index 000000000..9ef5200af
--- /dev/null
+++ b/crates/libanalysis/tests/tests.rs
@@ -0,0 +1,45 @@
+extern crate libanalysis;
+extern crate assert_eq_text;
+
+use std::path::PathBuf;
+
+use libanalysis::{WorldState, FileId};
+use assert_eq_text::assert_eq_dbg;
+
+
+#[test]
+fn test_resolve_module() {
+    let mut world = WorldState::new();
+    world.change_file(FileId(1), Some("mod foo;".to_string()));
+    world.change_file(FileId(2), Some("".to_string()));
+
+    let snap = world.snapshot(|id, path| {
+        assert_eq!(id, FileId(1));
+        if path == PathBuf::from("../foo/mod.rs") {
+            return None;
+        }
+        assert_eq!(path, PathBuf::from("../foo.rs"));
+        Some(FileId(2))
+    });
+    let symbols = snap.approximately_resolve_symbol(FileId(1), 4.into())
+        .unwrap();
+    assert_eq_dbg(
+        r#"[(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })]"#,
+        &symbols,
+    );
+
+    let snap = world.snapshot(|id, path| {
+        assert_eq!(id, FileId(1));
+        if path == PathBuf::from("../foo.rs") {
+            return None;
+        }
+        assert_eq!(path, PathBuf::from("../foo/mod.rs"));
+        Some(FileId(2))
+    });
+    let symbols = snap.approximately_resolve_symbol(FileId(1), 4.into())
+        .unwrap();
+    assert_eq_dbg(
+        r#"[(FileId(2), FileSymbol { name: "foo", node_range: [0; 0), kind: MODULE })]"#,
+        &symbols,
+    );
+}
diff --git a/crates/libeditor/Cargo.toml b/crates/libeditor/Cargo.toml
index 502f532a7..7b39870cd 100644
--- a/crates/libeditor/Cargo.toml
+++ b/crates/libeditor/Cargo.toml
@@ -10,4 +10,6 @@ superslice = "0.1.0"
 
 libsyntax2 = { path = "../libsyntax2" }
 smol_str = "0.1.0"
+
+[dev-dependencies]
 assert_eq_text = { path = "../assert_eq_text" }
diff --git a/crates/libeditor/tests/test.rs b/crates/libeditor/tests/test.rs
index 97919d347..df4cb65d1 100644
--- a/crates/libeditor/tests/test.rs
+++ b/crates/libeditor/tests/test.rs
@@ -6,6 +6,7 @@ extern crate assert_eq_text;
 
 use std::fmt;
 use itertools::Itertools;
+use assert_eq_text::{assert_eq_dbg};
 use libeditor::{
     File, TextUnit, TextRange, ActionResult, CursorPosition,
     highlight, runnables, extend_selection, file_structure,
@@ -33,7 +34,7 @@ fn main() {}
     println!("Hello, {}!", 92);
 "#);
     let hls = highlight(&file);
-    dbg_eq(
+    assert_eq_dbg(
         r#"[HighlightedRange { range: [1; 11), tag: "comment" },
             HighlightedRange { range: [12; 14), tag: "keyword" },
             HighlightedRange { range: [15; 19), tag: "function" },
@@ -57,7 +58,7 @@ fn test_foo() {}
 fn test_foo() {}
 "#);
     let runnables = runnables(&file);
-    dbg_eq(
+    assert_eq_dbg(
         r#"[Runnable { range: [1; 13), kind: Bin },
             Runnable { range: [15; 39), kind: Test { name: "test_foo" } },
             Runnable { range: [41; 75), kind: Test { name: "test_foo" } }]"#,
@@ -86,7 +87,7 @@ impl E {}
 impl fmt::Debug for E {}
 "#);
     let symbols = file_structure(&file);
-    dbg_eq(
+    assert_eq_dbg(
         r#"[StructureNode { parent: None, label: "Foo", navigation_range: [8; 11), node_range: [1; 26), kind: STRUCT_DEF },
             StructureNode { parent: Some(0), label: "x", navigation_range: [18; 19), node_range: [18; 24), kind: NAMED_FIELD },
             StructureNode { parent: None, label: "m", navigation_range: [32; 33), node_range: [28; 53), kind: MODULE },
@@ -147,12 +148,6 @@ fn file(text: &str) -> File {
     File::parse(text)
 }
 
-fn dbg_eq(expected: &str, actual: &impl fmt::Debug) {
-    let actual = format!("{:?}", actual);
-    let expected = expected.lines().map(|l| l.trim()).join(" ");
-    assert_eq!(expected, actual);
-}
-
 fn check_action<F: Fn(&File, TextUnit) -> Option<ActionResult>>(
     before: &str,
     after: &str,
diff --git a/crates/libsyntax2/Cargo.toml b/crates/libsyntax2/Cargo.toml
index 78e9e18a2..b55cdf481 100644
--- a/crates/libsyntax2/Cargo.toml
+++ b/crates/libsyntax2/Cargo.toml
@@ -7,7 +7,7 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 unicode-xid = "0.1.0"
 text_unit = "0.1.2"
-itertools = "0.7.5"
+itertools = "0.7.8"
 drop_bomb = "0.1.4"
 parking_lot = "0.6.0"
 smol_str = "0.1.0"