Fix small issues with end insertion (#940)

* Remove extra space after end insertion

This commit ensures there is no extra space added after the cursor when
on type formatting inserts an `end` keyword. For some reason, if we try
to insert the newline character and the `end` keyword via a single edit
without the extra space, `applyEdit` [1] strips the indentation and the
cursor ends up at the beginning of the middle line. Inserting the
newline via a separate edit doesn't seem to have this problem.

[1]: https://github.com/Shopify/vscode-ruby-lsp/blob/74e45e754aac281a22d5627c22a1a2a3e73d8b33/src/client.ts#L160

* Fix cusor position when breaking after keyword

If the user breaks just after the keyword, this commit ensures the
cursor is placed back where the break happened. This is currently broken
in that the cursor will end up 1 character into the next line. There was
some discussion [1] about whether the cursor should remain where it
would normally be if the end insertion didn't happen, but it appears
moving it back to where the break happened is the intended behavior.

[1]: #462 (comment)

* Add newline when breaking after keyword

This commit ensures that when breaking after the keyword, the `end` is
inserted with a newline, rather than replacing an existing empty line.

lib/ruby_lsp/requests/on_type_formatting.rb

@@ -112,11 +112,12 @@ def handle_statement_end
         next_line = @lines[@position[:line] + 1]
 
         if current_line.nil? || current_line.strip.empty?
-          add_edit_with_text(" \n#{indents}end")
+          add_edit_with_text("\n")
+          add_edit_with_text("#{indents}end")
           move_cursor_to(@position[:line], @indentation + 2)
         elsif next_line.nil? || next_line.strip.empty?
-          add_edit_with_text("#{indents}end", { line: @position[:line] + 1, character: @position[:character] })
-          move_cursor_to(@position[:line], @indentation + 3)
+          add_edit_with_text("#{indents}end\n", { line: @position[:line] + 1, character: @position[:character] })
+          move_cursor_to(@position[:line] - 1, @indentation + @previous_line.size + 1)
         end
       end
 

test/requests/on_type_formatting_test.rb

@@ -20,7 +20,11 @@ def test_adding_missing_ends
     expected_edits = [
       {
         range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
-        newText: " \nend",
+        newText: "\n",
+      },
+      {
+        range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
+        newText: "end",
       },
       {
         range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
@@ -302,7 +306,11 @@ def test_breaking_line_between_keyword_and_more_content
     expected_edits = [
       {
         range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
-        newText: " \nend",
+        newText: "\n",
+      },
+      {
+        range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
+        newText: "end",
       },
       {
         range: { start: { line: 1, character: 2 }, end: { line: 1, character: 2 } },
@@ -328,4 +336,31 @@ def test_breaking_line_between_keyword_when_there_is_content_on_the_next_line
     edits = RubyLsp::Requests::OnTypeFormatting.new(document, { line: 0, character: 2 }, "\n").run
     assert_empty(edits)
   end
+
+  def test_breaking_line_immediately_after_keyword
+    document = RubyLsp::Document.new(source: +"", version: 1, uri: URI("file:///fake.rb"))
+
+    document.push_edits(
+      [{
+        range: { start: { line: 0, character: 0 }, end: { line: 0, character: 0 } },
+        text: "  def\nfoo",
+      }],
+      version: 2,
+    )
+    document.parse
+
+    edits = RubyLsp::Requests::OnTypeFormatting.new(document, { line: 1, character: 2 }, "\n").run
+    expected_edits = [
+      {
+        range: { start: { line: 2, character: 2 }, end: { line: 2, character: 2 } },
+        newText: "  end\n",
+      },
+      {
+        range: { start: { line: 0, character: 6 }, end: { line: 0, character: 6 } },
+        newText: "$0",
+      },
+    ]
+
+    assert_equal(expected_edits.to_json, T.must(edits).to_json)
+  end
 end