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|
#!/bin/bash
set -e
set -f
set -o pipefail
shopt -s lastpipe
PROGNAME=${0##*/}
BOT_SIZE=8
BOT_TITLE=input
BOT_CMD=start
TOP_CMD='PS1="$TOP_TITLE\$ " bash --noprofile --norc -i'
TOP_TITLE=output
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 <<'.'
unbindall
escape \0\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
.
save_screenrc 'startpane' <<'.'
focus top
screen -ln -t "$TOP_TITLE" 1 sh -c "$TOP_CMD"
exec .!. socat -u UNIX-RECV:"$TWOPANE"/socket STDOUT
title 'output'
focus bottom
layout save 0
.
save_screenrc 'restart' <<.
layout new
split
focus bottom
resize $BOT_SIZE
select 0
title 'input'
source "$TWOPANE"/screenrc.startpane
.
restart()
{
screen -X source "$TWOPANE"/screenrc.restart
}
sendp()
{
trap "kill -SIGUSR1 $1" EXIT
socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket || 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[@]}"
}
start()
{
trap ': SIGPIPE ${SOCAT[@]@A}' SIGPIPE
trap ': SIGCHLD ${SOCAT[@]@A}' SIGCHLD
trap ': SIGUSR1 ${SOCAT[@]@A}; SOCAT=()' SIGUSR1
raw
while read -r -N1 || [ $? -gt 128 ]
do
if [ "$REPLY" ]
then
sendc "$REPLY"
fi
done
}
save_file bashrc <<.
set -f
set -b
set -o pipefail
shopt -s lastpipe
trap "screen -X quit" EXIT
$(declare -f)
export PS1="$BOT_TITLE\$ "
\$BOT_CMD
.
main()
{
screen -c "$TWOPANE"/screenrc -m -S "$STY" -ln
}
main "$@"
|
