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-rw-r--r--sample/pty/shl.rb92
1 files changed, 92 insertions, 0 deletions
diff --git a/sample/pty/shl.rb b/sample/pty/shl.rb
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+++ b/sample/pty/shl.rb
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+#
+# 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'
+
+$shells = []
+$n_shells = 0
+
+$r_pty = nil
+$w_pty = nil
+
+def writer
+ system "stty -echo raw"
+ begin
+ while true
+ c = STDIN.getc
+ if c == 26 then # C-z
+ $reader.raise(nil)
+ return 'Suspend'
+ end
+ $w_pty.print c.chr
+ $w_pty.flush
+ end
+ rescue
+ $reader.raise(nil)
+ return 'Exit'
+ ensure
+ system "stty echo -raw"
+ end
+end
+
+$reader = Thread.new {
+ while true
+ begin
+ next if $r_pty.nil?
+ c = $r_pty.getc
+ if c.nil? then
+ Thread.stop
+ end
+ print c.chr
+ STDOUT.flush
+ rescue
+ Thread.stop
+ end
+ end
+}
+
+# $reader.raise(nil)
+
+
+while true
+ print ">> "
+ STDOUT.flush
+ case gets
+ when /^c/i
+ $shells[$n_shells] = PTY.spawn("/bin/csh")
+ $r_pty,$w_pty = $shells[$n_shells]
+ $n_shells += 1
+ $reader.run
+ if writer == 'Exit'
+ $n_shells -= 1
+ $shells[$n_shells] = nil
+ end
+ when /^p/i
+ for i in 0..$n_shells
+ unless $shells[i].nil?
+ print i,"\n"
+ end
+ end
+ when /^([0-9]+)/
+ n = $1.to_i
+ if $shells[n].nil?
+ print "\##{i} doesn't exist\n"
+ else
+ $r_pty,$w_pty = $shells[n]
+ $reader.run
+ if writer == 'Exit' then
+ $shells[n] = nil
+ end
+ end
+ when /^q/i
+ exit
+ end
+end