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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 $TOP_CMD
exec .!. sh -c 'socat UNIX-LISTEN:"\$TWOPANE"/socket STDIN,rawer!!STDOUT'
title 'output'
focus top
.
restart()
{
while screen -p1 -Q info >/dev/null
do
screen -p1 -X kill
done
screen -X source "$TWOPANE"/screenrc.startpane
}
sendstream()
{
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; restart' USR1
exec 100<&0 101>&1
while true
do
coproc SOCAT \
{
socat STDIN!!STDOUT UNIX-CONNECT:"$TWOPANE"/socket,forever
kill -USR1 $$
}
exec 200<&${SOCAT[0]} 201>&${SOCAT[1]}
socat FD:100,${stty%,}!!STDOUT STDIN!!STDOUT <&200 |
input_filter |
tee >(output_filter | soft_cursor >&101) >&201
reset -I -Q -w
exec 200<&- 201>&-
wait -f "$SOCAT_PID" 2>/dev/null
done
}
input_filter()
{
while read -N1
do
case "$REPLY" in
a ) echo -n "${REPLY@U}" ;;
A ) echo -n "${REPLY@L}" ;;
* ) echo -n "$REPLY" ;;
esac
done
}
output_filter()
{
cat -vt
}
soft_cursor()
{
printf $'\033[43m \b'
while read -N1
do
printf '%s' \
$'\033[00m \b' \
"$REPLY" \
$'\033[43m \b'
done
}
save_file bashrc <<.
set -f
set -b
set -o pipefail
shopt -s lastpipe
trap "screen -X quit" EXIT
$(declare -f)
export PS1="\$BOT_TITLE\$ "
if [ "\$SHOW_SOCAT_ERRORS" ]
then
exec 20>&2
else
exec 20>/dev/null
fi
\$BOT_CMD
.
main()
{
screen -c "$TWOPANE"/screenrc -m -S "$STY" -ln
}
main "$@"
|
