From 832dfae25024b8e6da097bfbf99a6b749e5e0ad0 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 6 Feb 2020 15:36:32 +0100
Subject: Tweak goto parent module

---
 crates/ra_ide/src/marks.rs         |  1 +
 crates/ra_ide/src/parent_module.rs | 37 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/crates/ra_ide/src/marks.rs b/crates/ra_ide/src/marks.rs
index 077a44473..5bf4d2062 100644
--- a/crates/ra_ide/src/marks.rs
+++ b/crates/ra_ide/src/marks.rs
@@ -11,4 +11,5 @@ test_utils::marks!(
     call_info_bad_offset
     dont_complete_current_use
     dont_complete_primitive_in_use
+    test_resolve_parent_module_on_module_decl
 );
diff --git a/crates/ra_ide/src/parent_module.rs b/crates/ra_ide/src/parent_module.rs
index e0332da88..af14d6ab3 100644
--- a/crates/ra_ide/src/parent_module.rs
+++ b/crates/ra_ide/src/parent_module.rs
@@ -6,6 +6,7 @@ use ra_syntax::{
     algo::find_node_at_offset,
     ast::{self, AstNode},
 };
+use test_utils::tested_by;
 
 use crate::NavigationTarget;
 
@@ -14,7 +15,21 @@ use crate::NavigationTarget;
 pub(crate) fn parent_module(db: &RootDatabase, position: FilePosition) -> Vec<NavigationTarget> {
     let mut sb = hir::SourceBinder::new(db);
     let parse = db.parse(position.file_id);
-    let module = match find_node_at_offset::<ast::Module>(parse.tree().syntax(), position.offset) {
+
+    let mut module = find_node_at_offset::<ast::Module>(parse.tree().syntax(), position.offset);
+
+    // If cursor is literally on `mod foo`, go to the grandpa.
+    if let Some(m) = &module {
+        if !m
+            .item_list()
+            .map_or(false, |it| it.syntax().text_range().contains_inclusive(position.offset))
+        {
+            tested_by!(test_resolve_parent_module_on_module_decl);
+            module = m.syntax().ancestors().skip(1).find_map(ast::Module::cast);
+        }
+    }
+
+    let module = match module {
         Some(module) => sb.to_def(hir::InFile::new(position.file_id.into(), module)),
         None => sb.to_module_def(position.file_id),
     };
@@ -41,6 +56,7 @@ pub(crate) fn crate_for(db: &RootDatabase, file_id: FileId) -> Vec<CrateId> {
 mod tests {
     use ra_cfg::CfgOptions;
     use ra_db::Env;
+    use test_utils::covers;
 
     use crate::{
         mock_analysis::{analysis_and_position, MockAnalysis},
@@ -62,6 +78,25 @@ mod tests {
         nav.assert_match("foo MODULE FileId(1) [0; 8)");
     }
 
+    #[test]
+    fn test_resolve_parent_module_on_module_decl() {
+        covers!(test_resolve_parent_module_on_module_decl);
+        let (analysis, pos) = analysis_and_position(
+            "
+            //- /lib.rs
+            mod foo;
+
+            //- /foo.rs
+            mod <|>bar;
+
+            //- /foo/bar.rs
+            // empty
+            ",
+        );
+        let nav = analysis.parent_module(pos).unwrap().pop().unwrap();
+        nav.assert_match("foo MODULE FileId(1) [0; 8)");
+    }
+
     #[test]
     fn test_resolve_parent_module_for_inline() {
         let (analysis, pos) = analysis_and_position(
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