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#!../expect -f

# expect script to connect two UNIX chess programs together.

# written by Don Libes - May 9, 1990

# Note, this depends on the "usual" UNIX chess output.  Other chess programs

# will almost certainly not work.

# Moves and counter-moves are printed out in different formats, sigh...

# But I guess that's what makes this Expect script challenging to write.

# In particular, the 1st player outputs:

#

# p/k2-k4               (echo from 2nd player)

# 1. ... p/k2-k4        (reprint it with a number in front - god knows why)

# 2. n/kn1-kb3          (our new move)

#

# and the 2nd player outputs the following

#

# n/kn1-kb3             (echo from first player)

# 2. n/kn1-kb3          (reprint it as above, but differently - god knows why)

# 2. ... p/k4-k5        (our new countermove - written differently, of course)

set timeout -1;                 # wait forever

expect_before {

        -i $any_spawn_id eof {

                send_user "player resigned!\n"

                exit

        }

}

# start things rolling

spawn chess

set id1 $spawn_id

expect "Chess\r\n"

send "first\r"

# read_first_move

expect -re "1. (.*)\n"

spawn chess

set id2 $spawn_id

expect "Chess\r\n"

send $expect_out(1,string)

for {} 1 {} {

        expect {

                -i $id2 -re "\\.\\. (.*)\n" {

                        send -i $id1 $expect_out(1,string)

                }

                -i $id1 -re "\\.\\. .*\\. (.*)\n" {

                        send -i $id2 $expect_out(1,string)

                }

        }

}