From d201317c67eb1310ff775cf2164c9f4731c72c83 Mon Sep 17 00:00:00 2001
From: Lukas Wirth <lukastw97@gmail.com>
Date: Sat, 5 Sep 2020 15:00:06 +0200
Subject: Fix segment_iter not iterating segments properly

---
 crates/assists/src/utils/insert_use.rs | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'crates/assists')

diff --git a/crates/assists/src/utils/insert_use.rs b/crates/assists/src/utils/insert_use.rs
index 8a4c8520d..1cb52318a 100644
--- a/crates/assists/src/utils/insert_use.rs
+++ b/crates/assists/src/utils/insert_use.rs
@@ -138,7 +138,7 @@ pub(crate) fn insert_use(
     algo::insert_children(scope.as_syntax_node(), insert_position, to_insert)
 }
 
-fn try_merge_imports(
+pub(crate) fn try_merge_imports(
     old: &ast::Use,
     new: &ast::Use,
     merge_behaviour: MergeBehaviour,
@@ -161,7 +161,7 @@ fn use_tree_list_is_nested(tl: &ast::UseTreeList) -> bool {
 }
 
 // FIXME: currently this merely prepends the new tree into old, ideally it would insert the items in a sorted fashion
-pub fn try_merge_trees(
+pub(crate) fn try_merge_trees(
     old: &ast::UseTree,
     new: &ast::UseTree,
     merge_behaviour: MergeBehaviour,
@@ -278,7 +278,8 @@ fn first_path(path: &ast::Path) -> ast::Path {
 }
 
 fn segment_iter(path: &ast::Path) -> impl Iterator<Item = ast::PathSegment> + Clone {
-    path.syntax().children().flat_map(ast::PathSegment::cast)
+    // cant make use of SyntaxNode::siblings, because the returned Iterator is not clone
+    successors(first_segment(path), |p| p.parent_path().parent_path().and_then(|p| p.segment()))
 }
 
 #[derive(PartialEq, Eq)]
@@ -684,8 +685,18 @@ use std::io;",
         check_last(
             "foo::bar",
             r"use foo::bar::baz::Qux;",
-            r"use foo::bar::baz::Qux;
-use foo::bar;",
+            r"use foo::bar;
+use foo::bar::baz::Qux;",
+        );
+    }
+
+    #[test]
+    fn insert_short_before_long() {
+        check_none(
+            "foo::bar",
+            r"use foo::bar::baz::Qux;",
+            r"use foo::bar;
+use foo::bar::baz::Qux;",
         );
     }
 
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