[ruby/reline] Avoid STDIN.winsize called in require "reline"

(ruby/reline#703)

ruby/reline@21891c47c4

lib/reline/line_editor.rb

@@ -75,7 +75,7 @@ def lines(screen_width)
   def initialize(config, encoding)
     @config = config
     @completion_append_character = ''
-    @screen_size = Reline::IOGate.get_screen_size
+    @screen_size = [0, 0] # Should be initialized with actual winsize in LineEditor#reset
     reset_variables(encoding: encoding)
   end
 

test/reline/test_reline.rb

@@ -378,10 +378,28 @@ def test_dumb_terminal
     assert_equal("Reline::GeneralIO", out.chomp)
   end
 
+  def test_require_reline_should_not_trigger_winsize
+    pend if win?
+    lib = File.expand_path("../../lib", __dir__)
+    code = <<~RUBY
+      require "io/console"
+      def STDIN.tty?; true; end
+      def STDOUT.tty?; true; end
+      def STDIN.winsize; raise; end
+      require("reline") && p(Reline.core.io_gate)
+    RUBY
+    out = IO.popen([{}, Reline.test_rubybin, "-I#{lib}", "-e", code], &:read)
+    assert_equal("Reline::ANSI", out.chomp)
+  end
+
+  def win?
+    /mswin|mingw/.match?(RUBY_PLATFORM)
+  end
+
   def get_reline_encoding
     if encoding = Reline.core.encoding
       encoding
-    elsif RUBY_PLATFORM =~ /mswin|mingw/
+    elsif win?
       Encoding::UTF_8
     else
       Encoding::default_external