Implement vi_change_meta

lib/reline/line_editor.rb

@@ -1922,6 +1922,18 @@ def finish
   end
 
   private def vi_change_meta(key)
+    @waiting_operator_proc = proc { |cursor_diff, byte_pointer_diff|
+      if byte_pointer_diff > 0
+        @line, cut = byteslice!(@line, @byte_pointer, byte_pointer_diff)
+      elsif byte_pointer_diff < 0
+        @line, cut = byteslice!(@line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff)
+      end
+      copy_for_vi(cut)
+      @cursor += cursor_diff if cursor_diff < 0
+      @cursor_max -= cursor_diff.abs
+      @byte_pointer += byte_pointer_diff if byte_pointer_diff < 0
+      @config.editing_mode = :vi_insert
+    }
   end
 
   private def vi_delete_meta(key)

test/reline/test_key_actor_vi.rb

@@ -1214,4 +1214,27 @@ def test_vi_delete_meta
     assert_cursor_max(11)
     assert_line('aaa ddd eee')
   end
+
+  def test_vi_change_meta
+    input_keys("aaa bbb ccc ddd eee\C-[02w")
+    assert_byte_pointer_size('aaa bbb ')
+    assert_cursor(8)
+    assert_cursor_max(19)
+    assert_line('aaa bbb ccc ddd eee')
+    input_keys('cwaiueo ')
+    assert_byte_pointer_size('aaa bbb aiueo ')
+    assert_cursor(14)
+    assert_cursor_max(21)
+    assert_line('aaa bbb aiueo ddd eee')
+    input_keys("\C-[")
+    assert_byte_pointer_size('aaa bbb aiueo')
+    assert_cursor(13)
+    assert_cursor_max(21)
+    assert_line('aaa bbb aiueo ddd eee')
+    input_keys('cb')
+    assert_byte_pointer_size('aaa bbb ')
+    assert_cursor(8)
+    assert_cursor_max(16)
+    assert_line('aaa bbb  ddd eee')
+  end
 end