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#!/bin/bash
set -e
set -f
set -o pipefail
shopt -s lastpipe
BOT_SIZE=8
BOT_TITLE=input
BOT_CMD='PS1="$BOT_TITLE\$ " bash --noprofile --norc -i'
TOP_CMD='PS1="$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.${TWOPANE##*/}
save_file()
{
out=$TWOPANE/${1:?$0: filename cannot be empty string}
cat > "$out"
}
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 "$TWOPANE"/bashrc
source "$TWOPANE"/screenrc.startpane
.
save_screenrc 'startpane' <<'.'
focus top
screen -ln -t "$TOP_TITLE" 1 sh -c "$TOP_CMD; screen -X focus top; screen -X remove"
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
.
save_file bashrc <<'.'
trap "screen -X quit" EXIT
restart()
{
screen -X source "$TWOPANE"/screenrc.restart
}
sendp()
{
socat -u STDIN UNIX-SENDTO:"$TWOPANE"/socket
}
sendc()
{
printf '%s' "$*" | sendp
}
send()
{
sendc "$*"$'\n'
}
start()
{
while read -r -N1
do
sendc "$REPLY"
done
}
export -f restart sendp sendc send start
bash -c "$BOT_CMD" || read -p "Error: process terminated with exit code $?
Press enter to quit."
.
screen -c "$TWOPANE"/screenrc -m -S "$STY" -ln
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