Support DEL key

lib/reline.rb

@@ -299,7 +299,8 @@ module Reline
           [224, 72] => :ed_prev_history,    # ↑
           [224, 80] => :ed_next_history,    # ↓
           [224, 77] => :ed_next_char,       # →
-          [224, 75] => :ed_prev_char        # ←
+          [224, 75] => :ed_prev_char,       # ←
+          [224, 83] => :key_delete          # Del
         }
       }
     else
@@ -308,7 +309,8 @@ module Reline
           [27, 91, 65] => :ed_prev_history,    # ↑
           [27, 91, 66] => :ed_next_history,    # ↓
           [27, 91, 67] => :ed_next_char,       # →
-          [27, 91, 68] => :ed_prev_char        # ←
+          [27, 91, 68] => :ed_prev_char,       # ←
+          [27, 91, 51, 126] => :key_delete     # Del
         }
       }
     end

lib/reline/line_editor.rb

@@ -761,6 +761,12 @@ class Reline::LineEditor
     }
   end
 
+  private def key_delete(key)
+    if @config.editing_mode_is?(:vi_insert, :emacs)
+      ed_delete_next_char(key)
+    end
+  end
+
   private def ed_insert(key)
     if key.instance_of?(String)
       width = Reline::Unicode.get_mbchar_width(key)

test/reline/test_key_actor_emacs.rb

@@ -1180,4 +1180,29 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
     assert_cursor(0)
     assert_cursor_max(3)
   end
+
+=begin # TODO: move KeyStroke instance from Reline to LineEditor
+  def test_key_delete
+    input_keys('ab')
+    assert_byte_pointer_size('ab')
+    assert_cursor(2)
+    assert_cursor_max(2)
+    assert_line('ab')
+    [27, 91, 51, 126].each do |key|
+      @line_editor.input_key(key)
+    end
+    assert_byte_pointer_size('ab')
+    assert_cursor(2)
+    assert_cursor_max(2)
+    assert_line('ab')
+    input_keys("\C-b")
+    [27, 91, 51, 126].each do |key|
+      @line_editor.input_key(key)
+    end
+    assert_byte_pointer_size('a')
+    assert_cursor(1)
+    assert_cursor_max(1)
+    assert_line('a')
+  end
+=end
 end