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|
#!/bin/bash
set -e
set -f
set -o pipefail
shopt -s lastpipe
PROGNAME=${0##*/}
BOT_SIZE=8
BOT_TITLE=input
BOT_CMD=sendstream
if [ $# = 0 ]
then
TOP_CMD="$SHELL -i"
else
TOP_CMD=$*
fi
TOP_TITLE=$TOP_CMD
TWOPANE=$(mktemp -d)
export TWOPANE TOP_CMD BOT_CMD TOP_TITLE BOT_TITLE BOT_SIZE
trap 'rm -r "$TWOPANE"' EXIT
STY=twopane.${TWOPANE##*/}
save_file()
{
cat > "$TWOPANE"/"${1:?$PROGNAME: Error: filename cannot be empty string}"
}
save_screenrc()
{
save_file screenrc"${1:+.$1}"
}
save_screenrc <<'.'
# Disable keybindings.
unbindall
escape \0\0
# Disable messages. This is needed for screen -X/-Q to work reasonably.
msgwait 0
msgminwait 0
caption string '%t'
layout new
split
focus bottom
resize $BOT_SIZE
screen -ln -t "$BOT_TITLE" 0 bash --noprofile --rcfile "$TWOPANE"/bashrc -i
source "$TWOPANE"/screenrc.startpane
layout save 0
.
save_screenrc 'startpane' <<.
focus top
screen -ln -t "\$TOP_TITLE" 1 $TOP_CMD
exec .!. sh -c 'socat UNIX-RECV:"\$TWOPANE"/socket!!UNIX-SEND:"\$TWOPANE"/rsocket STDIN,rawer!!STDOUT'
title 'output'
focus top
.
restart()
{
while screen -p1 -Q info >/dev/null
do
screen -p1 -X kill
done
screen -X source "$TWOPANE"/screenrc.startpane
}
sendp()
{
trap "kill -SIGUSR1 ${1:-$$}" EXIT
socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket 2>&20 || restart
}
sendc()
{
[ "${SOCAT[1]}" ] || coproc SOCAT { sendp $$; }
printf '%s' "$*" >&${SOCAT[1]}
}
send()
{
sendc "$*"$'\n'
}
raw()
{
stty_opts=(
cbreak
raw
-isig
-iexten
-nl
intr undef
quit undef
#erase undef
#kill undef
eof undef
start undef
stop undef
susp undef
lnext undef
)
stty "${stty_opts[@]}"
}
:()
{
if [ "$#" -gt 0 ]
then
printf '%s: %s\r\n' "$0" "$*" >&2
fi
}
start()
{
socat_stty_opts=(
echo=1
echoctl=1
intr=0
quit=0
eof=0
start=0
stop=0
susp=0
lnext=0
)
stty=$(printf %s, "${socat_stty_opts[@]}")
while ! socat -u \
STDIN,rawer,"${stty}" \
UNIX-SENDTO:"$TWOPANE"/socket
do
restart
done
}
recvstream()
{
socat -u UNIX-RECV:"$TWOPANE"/rsocket STDOUT |
tee >(socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket) |
cat -v
}
sendstream()
{
while ! recvstream
do
continue
done &
trap "kill $!" EXIT
trap '' SIGPIPE
trap 'SOCAT=(); RETRY=$REPLY;' SIGUSR1
raw
while [ "$RETRY" ] || read -t 0.1 -r -N1 || [ $? -gt 128 ]
do
REPLY=$RETRY$REPLY
RETRY=
if [ "$REPLY" ]
then
sendc "$REPLY"
elif ! [ -e "$TWOPANE"/socket ]
then
restart
fi
done
}
focus()
{
screen -X focus "$@"
}
quit()
{
screen -X quit
}
save_file bashrc <<.
set -f
set -b
set -o pipefail
shopt -s lastpipe
trap "screen -X quit" EXIT
$(declare -f)
export PS1="\$BOT_TITLE\$ "
if [ "\$SHOW_SOCAT_ERRORS" ]
then
exec 20>&2
else
exec 20>/dev/null
fi
\$BOT_CMD
.
main()
{
screen -c "$TWOPANE"/screenrc -m -S "$STY" -ln
}
main "$@"
|
