[ruby/reline] Ignore unhandled escape sequences

(https://github.com/ruby/reline/pull/522)

* Add unassigned escape sequence matcher to KeyStroke

* Do not insert ESC and unassigned ESC+key to input buffer

2 files changed, 40 insertions, 0 deletions

diff --git a/test/reline/test_key_stroke.rb b/test/reline/test_key_stroke.rb
index d377a1e972..cd205c7d9e 100644
--- a/test/reline/test_key_stroke.rb
+++ b/test/reline/test_key_stroke.rb
@@ -36,6 +36,27 @@ class Reline::KeyStroke::Test < Reline::TestCase
     assert_equal(:matched, stroke.match_status("abzwabk".bytes))
   end
 
+  def test_match_unknown
+    config = Reline::Config.new
+    config.add_default_key_binding("\e[9abc".bytes, 'x')
+    stroke = Reline::KeyStroke.new(config)
+    sequences = [
+      "\e[9abc",
+      "\e[9d",
+      "\e[A", # Up
+      "\e[1;1R", # Cursor position report
+      "\e[15~", # F5
+      "\eOP", # F1
+      "\e\e[A" # Option+Up
+    ]
+    sequences.each do |seq|
+      assert_equal(:matched, stroke.match_status(seq.bytes))
+      (1...seq.size).each do |i|
+        assert_equal(:matching, stroke.match_status(seq.bytes.take(i)))
+      end
+    end
+  end
+
   def test_expand
     config = Reline::Config.new
     {
@@ -45,6 +66,11 @@ class Reline::KeyStroke::Test < Reline::TestCase
     end
     stroke = Reline::KeyStroke.new(config)
     assert_equal('123'.bytes, stroke.expand('abc'.bytes))
+    # CSI sequence
+    assert_equal([:ed_unassigned] + 'bc'.bytes, stroke.expand("\e[1;2;3;4;5abc".bytes))
+    assert_equal([:ed_unassigned] + 'BC'.bytes, stroke.expand("\e\e[ABC".bytes))
+    # SS3 sequence
+    assert_equal([:ed_unassigned] + 'QR'.bytes, stroke.expand("\eOPQR".bytes))
   end
 
   def test_oneshot_key_bindings
diff --git a/test/reline/yamatanooroti/test_rendering.rb b/test/reline/yamatanooroti/test_rendering.rb
index def14edbe4..c0af918844 100644
--- a/test/reline/yamatanooroti/test_rendering.rb
+++ b/test/reline/yamatanooroti/test_rendering.rb
@@ -237,6 +237,20 @@ begin
       EOC
     end
 
+    def test_esc_input
+      omit if Reline::IOGate.win?
+      start_terminal(5, 20, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
+      write("def\C-aabc")
+      write("\e") # single ESC
+      sleep 1
+      write("A")
+      write("B\eAC") # ESC + A (M-A, specified ed_unassigned in Reline::KeyActor::Emacs)
+      assert_screen(<<~EOC)
+        Multiline REPL.
+        prompt> abcABCdef
+      EOC
+    end
+
     def test_prompt_with_escape_sequence
       ENV['RELINE_TEST_PROMPT'] = "\1\e[30m\2prompt> \1\e[m\2"
       start_terminal(5, 20, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')