[ruby/reline] Suppress callbacks in pasting

IRB uses Reline's 3 dynamic real-time callbacks with calling Ripper;
output_modifier_proc, prompt_proc, and auto_indent_proc. These processing
times make the paste time too long.

https://github.com/ruby/reline/commit/beec3399a8

5 files changed, 58 insertions, 2 deletions

diff --git a/lib/reline.rb b/lib/reline.rb
index eb18d0d075..2862f5bc64 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -235,13 +235,19 @@ module Reline
       line_editor.rerender
 
       begin
+        prev_pasting_state = false
         loop do
+          prev_pasting_state = Reline::IOGate.in_pasting?
           read_io(config.keyseq_timeout) { |inputs|
             inputs.each { |c|
               line_editor.input_key(c)
               line_editor.rerender
             }
           }
+          if prev_pasting_state == true and not Reline::IOGate.in_pasting? and not line_editor.finished?
+            prev_pasting_state = false
+            line_editor.rerender_all
+          end
           break if line_editor.finished?
         end
         Reline::IOGate.move_cursor_column(0)
diff --git a/lib/reline/ansi.rb b/lib/reline/ansi.rb
index 80fccd74f9..f11dbb80f4 100644
--- a/lib/reline/ansi.rb
+++ b/lib/reline/ansi.rb
@@ -80,6 +80,22 @@ class Reline::ANSI
     nil
   end
 
+  def self.in_pasting?
+    not Reline::IOGate.empty_buffer?
+  end
+
+  def self.empty_buffer?
+    unless @@buf.empty?
+      return false
+    end
+    rs, = IO.select([@@input], [], [], 0.00001)
+    if rs and rs[0]
+      false
+    else
+      true
+    end
+  end
+
   def self.ungetc(c)
     @@buf.unshift(c)
   end
diff --git a/lib/reline/general_io.rb b/lib/reline/general_io.rb
index 85f1f13eed..3b40888bed 100644
--- a/lib/reline/general_io.rb
+++ b/lib/reline/general_io.rb
@@ -67,6 +67,10 @@ class Reline::GeneralIO
   def self.set_winch_handler(&handler)
   end
 
+  def self.in_pasting?
+    false
+  end
+
   def self.prep
   end
 
diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index e5ecc8bbcb..5558a1bb07 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -56,6 +56,14 @@ class Reline::LineEditor
     reset_variables(encoding: encoding)
   end
 
+  def simplified_rendering?
+    if finished?
+      false
+    else
+      not @rerender_all and not finished? and Reline::IOGate.in_pasting?
+    end
+  end
+
   private def check_multiline_prompt(buffer, prompt)
     if @vi_arg
       prompt = "(arg: #{@vi_arg}) "
@@ -66,6 +74,7 @@ class Reline::LineEditor
     else
       prompt = @prompt
     end
+    return [prompt, calculate_width(prompt, true), [prompt] * buffer.size] if simplified_rendering?
     if @prompt_proc
       prompt_list = @prompt_proc.(buffer)
       prompt_list.map!{ prompt } if @vi_arg or @searching_prompt
@@ -297,6 +306,11 @@ class Reline::LineEditor
     @byte_pointer = new_byte_pointer
   end
 
+  def rerender_all
+    @rerender_all = true
+    rerender
+  end
+
   def rerender
     return if @line.nil?
     if @menu_info
@@ -523,6 +537,7 @@ class Reline::LineEditor
       end
     end
     Reline::IOGate.erase_after_cursor
+    Reline::IOGate.move_cursor_column(0)
     if with_control
       # Just after rendring, so the cursor is on the last line.
       if finished?
@@ -537,7 +552,7 @@ class Reline::LineEditor
   end
 
   private def modify_lines(before)
-    return before if before.nil? || before.empty?
+    return before if before.nil? || before.empty? || simplified_rendering?
 
     if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: finished?)
       after.lines("\n").map { |l| l.chomp('') }
@@ -836,7 +851,7 @@ class Reline::LineEditor
     unless completion_occurs
       @completion_state = CompletionState::NORMAL
     end
-    if @is_multiline and @auto_indent_proc
+    if @is_multiline and @auto_indent_proc and not simplified_rendering?
       process_auto_indent
     end
   end
@@ -1038,6 +1053,7 @@ class Reline::LineEditor
 
   def finish
     @finished = true
+    @rerender_all = true
     @config.reset
   end
 
diff --git a/lib/reline/windows.rb b/lib/reline/windows.rb
index 2a406e39d3..b09290bcf3 100644
--- a/lib/reline/windows.rb
+++ b/lib/reline/windows.rb
@@ -199,6 +199,20 @@ class Reline::Windows
     @@output_buf.unshift(c)
   end
 
+  def self.in_pasting?
+    not self.empty_buffer?
+  end
+
+  def self.empty_buffer?
+    if not @@input_buf.empty?
+      false
+    elsif @@kbhit.call == 0
+      true
+    else
+      false
+    end
+  end
+
   def self.get_screen_size
     csbi = 0.chr * 22
     @@GetConsoleScreenBufferInfo.call(@@hConsoleHandle, csbi)