dtach_manager

dtach_manager

#!/bin/bash

[ -n "$DTACH" ] && exit

DTACHDIR=$HOME/.dtach
[ ! -d "$DTACHDIR" ] && mkdir -p "$DTACHDIR"

pick_session(){
  [ -n "$(ls -1 $DTACHDIR)" ] && ls -1 $DTACHDIR | pick
}

get_pid(){
  ss --unix --processes --no-header state listening src $DTACHDIR/$1 |
    awk -F, '{print $2}' | sed 's/pid=//'
}

session="bash-$(date +%Y-%m-%d@%H:%M:%S)"
DTACH=1 dtach -A "$DTACHDIR/$session" -z -e '^b' bash

while [ -z "$DTACH" ]; do
  # No more sessions available, we stop
  if [ -z "$(ls -1 $DTACHDIR)" ]; then
    break
  fi

  pid=$(get_pid $session)
  # re-attach at exit
  if [ -z $pid ]; then
    session=$(ls -1 $DTACHDIR | head -n1)
  else
    read -n1 -s action
    case $action in
      s)
        # switch session
        session=$(pick_session) || continue
        ;;
      k)
        # kill session
        tokill=$(pick_session)        || continue
        tokill_pid=$(get_pid $tokill) || continue
        kill $tokill_pid
        ;;
      a)
        # abandon session: kill active session and switch
        tokill_pid=$(get_pid $session) || continue
        session=$(pick_session)        || continue
        # if we reselect the same session, don't kill it
        if [ "$tokill_pid" != $(get_pid $session) ]; then
          kill $tokill_pid
        fi
        ;;
      *)
        # No action, we re-attach to the active session
        ;;
    esac
  fi

  if [ -e "$DTACHDIR/$session" ]; then
    dtach -a "$DTACHDIR/$session" -z -e '^b'
  fi
done

echo "No more sessions - terminating"