[ruby/reline] Support ed_argument_digit by M+num

The vi mode can handle "argument number" before an operator or a motion,
such as, "3x" (equals "xxx"), and "3l" (equals "lll"). In the emacs
mode, GNU Readline can handle argument number with meta key, like
"Meta+3 x" (equals "xxx").

https://github.com/ruby/reline/commit/9183cc2e8b

1 files changed, 14 insertions, 0 deletions

diff --git a/test/reline/test_key_actor_emacs.rb b/test/reline/test_key_actor_emacs.rb
index dd9b8bd812..8053225d24 100644
--- a/test/reline/test_key_actor_emacs.rb
+++ b/test/reline/test_key_actor_emacs.rb
@@ -2292,6 +2292,20 @@ class Reline::KeyActor::Emacs::Test < Reline::TestCase
     assert_cursor_max(2)
   end
 
+  def test_ed_argument_digit_by_meta_num
+    input_keys('abcdef')
+    assert_byte_pointer_size('abcdef')
+    assert_cursor(6)
+    assert_cursor_max(6)
+    assert_line('abcdef')
+    input_keys("\M-2", false)
+    input_keys("\C-h", false)
+    assert_byte_pointer_size('abcd')
+    assert_cursor(4)
+    assert_cursor_max(4)
+    assert_line('abcd')
+  end
+
   def test_input_unknown_char
     input_keys('͸') # U+0378 (unassigned)
     assert_line('͸')