From 9cbf09ec4f24aa30af1d9855a909a6cfc67188f7 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 18 Mar 2021 12:57:55 +0300
Subject: rewrite merge use trees assist to use muatable syntax trees

changelog internal
---
 crates/ide_assists/src/handlers/unmerge_use.rs | 30 +++++++++++---------------
 1 file changed, 13 insertions(+), 17 deletions(-)

(limited to 'crates/ide_assists/src/handlers/unmerge_use.rs')

diff --git a/crates/ide_assists/src/handlers/unmerge_use.rs b/crates/ide_assists/src/handlers/unmerge_use.rs
index 616af7c2e..8d271e056 100644
--- a/crates/ide_assists/src/handlers/unmerge_use.rs
+++ b/crates/ide_assists/src/handlers/unmerge_use.rs
@@ -1,6 +1,6 @@
 use syntax::{
-    algo::SyntaxRewriter,
-    ast::{self, edit::AstNodeEdit, VisibilityOwner},
+    ast::{self, VisibilityOwner},
+    ted::{self, Position},
     AstNode, SyntaxKind,
 };
 
@@ -22,7 +22,7 @@ use crate::{
 // use std::fmt::Display;
 // ```
 pub(crate) fn unmerge_use(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
-    let tree: ast::UseTree = ctx.find_node_at_offset()?;
+    let tree: ast::UseTree = ctx.find_node_at_offset::<ast::UseTree>()?.clone_for_update();
 
     let tree_list = tree.syntax().parent().and_then(ast::UseTreeList::cast)?;
     if tree_list.use_trees().count() < 2 {
@@ -33,6 +33,9 @@ pub(crate) fn unmerge_use(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
     let use_: ast::Use = tree_list.syntax().ancestors().find_map(ast::Use::cast)?;
     let path = resolve_full_path(&tree)?;
 
+    let old_parent_range = use_.syntax().parent()?.text_range();
+    let new_parent = use_.syntax().parent()?;
+
     let target = tree.syntax().text_range();
     acc.add(
         AssistId("unmerge_use", AssistKind::RefactorRewrite),
@@ -47,20 +50,13 @@ pub(crate) fn unmerge_use(acc: &mut Assists, ctx: &AssistContext) -> Option<()>
                     tree.rename(),
                     tree.star_token().is_some(),
                 ),
-            );
-
-            let mut rewriter = SyntaxRewriter::default();
-            rewriter += tree.remove();
-            rewriter.insert_after(use_.syntax(), &ast::make::tokens::single_newline());
-            if let ident_level @ 1..=usize::MAX = use_.indent_level().0 as usize {
-                rewriter.insert_after(
-                    use_.syntax(),
-                    &ast::make::tokens::whitespace(&" ".repeat(4 * ident_level)),
-                );
-            }
-            rewriter.insert_after(use_.syntax(), new_use.syntax());
-
-            builder.rewrite(rewriter);
+            )
+            .clone_for_update();
+
+            tree.remove();
+            ted::insert(Position::after(use_.syntax()), new_use.syntax());
+
+            builder.replace(old_parent_range, new_parent.to_string());
         },
     )
 }
-- 
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