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# 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
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