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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
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