For JRUBY-6943

io/console extension missing in 1.9 mode

Add a trivial io/console using stty, for basic operations to work.

lib/ruby/shared/io/console.rb

@@ -0,0 +1,123 @@
+warn "io/console on JRuby shells out to stty for most operations"
+
+# attempt to call stty; if failure, fall back on stubbed version
+result = begin
+  `stty -a`
+rescue Exception
+  nil
+end
+
+if !result || $?.exitstatus != 0 || RbConfig::CONFIG['host_os'] =~ /(mswin)|(win32)|(ming)/
+  # Windows version is always stubbed for now
+  class IO
+    def raw(*)
+      yield self
+    end
+
+    def raw!(*)
+    end
+
+    def cooked(*)
+      yield self
+    end
+
+    def cooked!(*)
+    end
+
+    def getch(*)
+      getc
+    end
+
+    def echo=(echo)
+    end
+
+    def echo?
+      true
+    end
+
+    def noecho
+      yield self
+    end
+
+    def winsize
+      [25, 80]
+    end
+
+    def winsize=(size)
+    end
+
+    def iflush
+    end
+
+    def oflush
+    end
+
+    def ioflush
+    end
+  end
+else
+  # Non-Windows assumes stty command is available
+  class IO
+    def raw(*)
+      saved = `stty -g`
+      `stty raw`
+      yield self
+    ensure
+      `stty #{saved}`
+    end
+
+    def raw!(*)
+      `stty raw`
+    end
+
+    def cooked(*)
+      saved = `stty -g`
+      `stty cooked`
+      yield self
+    ensure
+      `stty #{saved}`
+    end
+
+    def cooked!(*)
+      `stty -raw`
+    end
+
+    def getch(*)
+      getc
+    end
+
+    def echo=(echo)
+      `stty #{echo ? 'echo' : '-echo'}`
+    end
+
+    def echo?
+      (`stty -a` =~ (/ -echo /)) ? false : true
+    end
+
+    def noecho
+      saved = `stty -g`
+      `stty -echo`
+      yield self
+    ensure
+      `stty #{saved}`
+    end
+
+    def winsize
+      match = `stty -a`.match(/(\d+) rows; (\d+) columns/)
+      [match[1].to_i, match[2].to_i]
+    end
+
+    def winsize=(size)
+      `stty rows #{size[0]} cols #{size[1]}`
+    end
+
+    def iflush
+    end
+
+    def oflush
+    end
+
+    def ioflush
+    end
+  end
+end