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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
if [ $# = 0 ]
then
TOP_CMD="$SHELL -i"
else
TOP_CMD=$*
fi
TOP_TITLE="Command: $TOP_CMD"
TWOPANE=$(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 $TOP_CMD
exec .!. sh -c 'socat UNIX-LISTEN:"\$TWOPANE"/socket STDIN,rawer!!STDOUT'
focus top
.
restart_top()
{
while screen -p1 -Q info >/dev/null
do
screen -p1 -X kill
done
screen -X source "$TWOPANE"/screenrc.startpane
}
socat_connect()
{
socat STDIN!!STDOUT UNIX-CONNECT:"$TWOPANE"/socket,forever
kill -USR1 $$
[ "$TOP_EXIT" != restart ] || restart_top
}
connect()
{
case $# in
2 ) declare -n std0="$1" std1="$2"; local pid ;;
3 ) declare -n pid="$1" std0="$2" std1="$3" ;;
* ) exit 1 ;;
esac
std0=${3:-200}
std1=${4:-201}
disconnect $std0 $std1
coproc SOCAT { socat_connect; }
pid=${SOCAT_PID}
eval "exec ${std0}<&${SOCAT[0]} ${std1}>&${SOCAT[1]}"
}
sendc()
{
[ "${SOCAT[0]}" || connect stdin stdout
printf '%s' "$*" >&$stdout
}
send()
{
[ "${SOCAT[0]}" || connect stdin stdout
printf '%s\n' "$*" >&$stdout
}
disconnect()
{
eval "exec ${1:-200}<&- ${2:-201}>&-"
wait -f "$SOCAT_PID" 2>/dev/null
}
restart()
{
start
}
start()
{
if [ "$STARTED" ]
then
restart_top
else
STARTED=y
fi
socat_stty_opts=(
rawer
echo=0
intr=0
quit=0
eof=0
start=0
stop=0
susp=0
lnext=0
opost=1
onlcr=1
onlret=1
)
stty=$(printf %s, "${socat_stty_opts[@]}")
trap ': SIGUSR1 ; SOCAT=() ; ' USR1
exec 100<&0 101>&1
while true
do
connect stdin stdout
socat FD:100,${stty%,}!!STDOUT STDIN!!STDOUT <&$stdin |
tee >(output_filter | soft_cursor >&101) >&$stdout
reset -I -Q -w
disconnect
case "$TOP_EXIT" in
restart )
continue ;;
quit )
exit ;;
* )
screen -X focus bottom
echo
break
;;
esac
done
}
quit()
{
screen -X quit
}
focus()
{
screen -X focus "$@"
}
output_filter()
{
exec 15> >(exec cat -v)
while read -r -N1
do
case "$REPLY" in
$'\n' )
echo -n '^J'
continue
;;
esac
if [[ "$REPLY" =~ [[:print:]] ]]
then
printf '%s' "$REPLY"
else
printf '%s' "$REPLY" >&15
fi
done
}
soft_cursor()
{
cursor=$'\033['${cursor_color:=104}$'m \b\033[00m'
printf '%s' "$cursor"
while read -r -N1
do
case "$REPLY" in
$'\r' ) printf '%s' "$REPLY" "$cursor" ;;
* ) printf '%s' $' \b' "$REPLY" "$cursor" ;;
esac
done
}
our_bashrc_main()
{
set -f
set -o pipefail
shopt -s lastpipe
trap "screen -X quit" EXIT
export PS1="\$BOT_TITLE\$ "
if [ "\$SHOW_SOCAT_ERRORS" ]
then
exec 20>&2
else
exec 20>/dev/null
fi
}
save_file bashrc <<.
$(declare -f)
our_bashrc_main
\$BOT_CMD
.
main()
{
screen -c "$TWOPANE"/screenrc -m -S "$STY" -ln
}
main "$@"
|
