s.sh

tmux-attach-session() {
  local session="$1"
  if tmux has-session -t="$session" 2> /dev/null; then
    if [ -n "$TMUX" ]; then
      tmux switch-client -t="$session"
    else
      tmux attach -t="$session"
    fi
  else
    if [ -n "$TMUX" ]; then
      tmux new -d -s "$session"
      tmux switch-client -t="$session"
    else
      tmux new -d -s "$session"
      tmux rename-window -t="$session" "main"
      tmux attach -t="$session"
    fi
  fi
}

#
# s - provides UI for switching between tmux sessions
#
# List all available sessions:
#
#   % s
#
# will present a fzf-based menu to switch to one of the existing session, if
# entered fzf query won't match any of sessions then it will be used as session
# name to create a new one and attach to it.
# 
# Switch to a specified session by name:
#
#   % s NAME
#
# similarly, if session NAME does not exist it will be created first.
#
s() {
  if [ -n "$1" ]; then
    tmux-attach-session "$1"
  else
    if tmux has-session 2> /dev/null; then
      local session
      session=$(
        tmux list-sessions -F "#{session_name}" \
          | fzf \
            --inline-info \
            --reverse \
            --height=20 \
            --bind=enter:replace-query+print-query \
            --prompt "tmux> " \
          | cut -f1 -d:
      )
      if [ "$session" != "" ]; then
        tmux-attach-session "$session"
      fi
    else
      local session
      session=$(
        echo -n '' |\
          fzf \
          --inline-info \
          --reverse \
          --height=20 \
          --bind=enter:replace-query+print-query \
          --prompt "tmux> "
      )
      if [ "$session" != "" ]; then
        tmux-attach-session "$session"
      fi
    fi
  fi
}