From 9cb821b02486de87b322089302fec3a63cda7b81 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@gmail.com>
Date: Mon, 13 May 2019 02:14:48 +0900
Subject: Implement Reline.input= and Reline.output=

---
 lib/reline.rb             | 18 ++++++++++++++++--
 lib/reline/ansi.rb        | 37 +++++++++++++++++++++++++------------
 lib/reline/line_editor.rb | 13 +++++++++----
 3 files changed, 50 insertions(+), 18 deletions(-)

diff --git a/lib/reline.rb b/lib/reline.rb
index 447551fe2f..f038100130 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -26,8 +26,6 @@ module Reline
     attr_reader :completion_append_character
     attr_accessor :completion_case_fold
     attr_accessor :filename_quote_characters
-    attr_writer :input
-    attr_writer :output
   end
 
   @@config = Reline::Config.new
@@ -82,6 +80,21 @@ module Reline
     raise NotImplementedError
   end
 
+  def self.input=(val)
+    raise TypeError unless val.respond_to?(:getc) or val.nil?
+    if val.respond_to?(:getc)
+      Reline::GeneralIO.input = val
+      remove_const('IO') if const_defined?('IO')
+      const_set('IO', Reline::GeneralIO)
+    end
+  end
+
+  @@output = STDOUT
+  def self.output=(val)
+    raise TypeError unless val.respond_to?(:write) or val.nil?
+    @@output = val
+  end
+
   def retrieve_completion_block(line, byte_pointer)
     break_regexp = /[#{Regexp.escape(@@basic_word_break_characters)}]/
     before_pointer = line.byteslice(0, byte_pointer)
@@ -139,6 +152,7 @@ module Reline
     else
       @@line_editor.multiline_off
     end
+    @@line_editor.output = @@output
     @@line_editor.completion_proc = @@completion_proc
     @@line_editor.dig_perfect_match_proc = @@dig_perfect_match_proc
     @@line_editor.retrieve_completion_block = method(:retrieve_completion_block)
diff --git a/lib/reline/ansi.rb b/lib/reline/ansi.rb
index eb13c7f55b..8db21fce4c 100644
--- a/lib/reline/ansi.rb
+++ b/lib/reline/ansi.rb
@@ -2,34 +2,47 @@ class Reline::ANSI
   def self.getc
     c = nil
     loop do
-      result = select([$stdin], [], [], 0.1)
+      result = select([STDIN], [], [], 0.1)
       next if result.nil?
-      c = $stdin.read(1)
+      c = STDIN.read(1)
       break
     end
     c&.ord
   end
 
   def self.get_screen_size
-    $stdin.winsize
+    STDIN.winsize
+  rescue Errno::ENOTTY
+    [24, 80]
   end
 
   def self.set_screen_size(rows, columns)
-    $stdin.winsize = [rows, columns]
+    STDIN.winsize = [rows, columns]
+    self
+  rescue Errno::ENOTTY
     self
   end
 
   def self.cursor_pos
-    res = ''
-    $stdin.raw do |stdin|
-      $stdout << "\e[6n"
-      $stdout.flush
-      while (c = stdin.getc) != 'R'
-        res << c if c
+    begin
+      res = ''
+      STDIN.raw do |stdin|
+        STDOUT << "\e[6n"
+        STDOUT.flush
+        while (c = stdin.getc) != 'R'
+          res << c if c
+        end
       end
+      res
+      m = res.match(/(?<row>\d+);(?<column>\d+)/)
+      column = m[:column].to_i - 1
+      row = m[:row].to_i - 1
+    rescue Errno::ENOTTY
+      buf = STDOUT.pread(STDOUT.pos, 0)
+      row = buf.count("\n")
+      column = buf.rindex("\n") ? (buf.size - buf.rindex("\n")) - 1 : 0
     end
-    m = res.match(/(?<row>\d+);(?<column>\d+)/)
-    Reline::CursorPos.new(m[:column].to_i - 1, m[:row].to_i - 1)
+    Reline::CursorPos.new(column, row)
   end
 
   def self.move_cursor_column(x)
diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index bb66a2ece7..a1c796e76f 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -11,6 +11,7 @@ class Reline::LineEditor
   attr_accessor :completion_proc
   attr_accessor :dig_perfect_match_proc
   attr_writer :retrieve_completion_block
+  attr_writer :output
 
   ARGUMENTABLE = %i{
     ed_delete_next_char
@@ -220,9 +221,9 @@ class Reline::LineEditor
     @rest_height ||= (Reline::IO.get_screen_size.first - 1) - Reline::IO.cursor_pos.y
     @screen_size ||= Reline::IO.get_screen_size
     if @menu_info
-      puts
+      @output.puts
       @menu_info.list.each do |item|
-        puts item
+        @output.puts item
       end
       @menu_info = nil
     end
@@ -359,12 +360,16 @@ class Reline::LineEditor
     visual_lines.each_with_index do |line, index|
       Reline::IO.move_cursor_column(0)
       escaped_print line
+      if @first_prompt
+        @first_prompt = false
+        @pre_input_hook&.call
+      end
       Reline::IO.erase_after_cursor
       move_cursor_down(1) if index < (visual_lines.size - 1)
     end
     if with_control
       if finished?
-        puts
+        @output.puts
       else
         move_cursor_up((visual_lines.size - 1) - @started_from)
         Reline::IO.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
@@ -378,7 +383,7 @@ class Reline::LineEditor
   end
 
   private def escaped_print(str)
-    print str.chars.map { |gr|
+    @output.print str.chars.map { |gr|
       escaped = Reline::Unicode::EscapedPairs[gr.ord]
       if escaped
         escaped
-- 
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