1 files changed, 93 insertions, 0 deletions
diff --git a/sample/pty/shl.rb b/sample/pty/shl.rb
new file mode 100644
index 0000000000..980748e8f5
--- /dev/null
+++ b/sample/pty/shl.rb
@@ -0,0 +1,93 @@
+# frozen_string_literal: true
+#
+#  old-fashioned 'shl' like program
+#  by A. Ito
+#
+#  commands:
+#     c        creates new shell
+#     C-z      suspends shell
+#     p        lists all shell
+#     0,1,...  choose shell
+#     q        quit
+
+require 'pty'
+require 'io/console'
+
+$shells = []
+
+$r_pty = nil
+$w_pty = nil
+
+def writer
+  STDIN.raw!
+  begin
+    while true
+      c = STDIN.getc
+      if c == ?\C-z then
+        $reader.raise('Suspend')
+        return 'Suspend'
+      end
+      $w_pty.print c.chr
+      $w_pty.flush
+    end
+  rescue
+    $reader.raise('Exit')
+    return 'Exit'
+  ensure
+    STDIN.cooked!
+  end
+end
+
+$reader = Thread.new {
+  while true
+    begin
+      Thread.stop unless $r_pty
+      c = $r_pty.getc
+      if c.nil? then
+        Thread.main.raise('Exit')
+        Thread.stop
+      end
+      print c.chr
+      STDOUT.flush
+    rescue
+      Thread.stop
+    end
+  end
+}
+
+# $reader.raise(nil)
+
+
+while true
+  print ">> "
+  STDOUT.flush
+  n = nil
+  case gets
+  when /^c/i
+    $shells << PTY.spawn("/bin/csh")
+    n = -1
+  when /^p/i
+    $shells.each_with_index do |s, i|
+      if s
+        print i,"\n"
+      end
+    end
+  when /^([0-9]+)/
+    n = $1.to_i
+    if $shells[n].nil?
+      print "\##{i} doesn't exist\n"
+      n = nil
+    end
+  when /^q/i
+    exit
+  end
+  if n
+    $r_pty, $w_pty, pid = $shells[n]
+    $reader.run
+    if writer == 'Exit' then
+      Process.wait(pid)
+      $shells[n] = nil
+      $shells.pop until $shells.empty? or $shells[-1]
+    end
+  end
+end