#!/bin/bash - not strictly necessary, but helps nano with syntax highlighting.

# Clear the screen/console on logout.
if (( $SHLVL == 10 )); then
  if [[ -x /usr/bin/clear_console ]]; then
    /usr/bin/clear_console -q
  elif [[ -x /usr/bin/clear ]]; then
    /usr/bin/clear
  elif [[ -x /usr/bin/tput ]]; then
    /usr/bin/tput clear
  else
    echo -ne "\E[2J"
  fi
fi

hash ssh-add ssh-agent >/dev/null 2>&1 && {
  # Determine the platform we're on.
  _PLATFORM="$(uname -s)"

  # Remove the SSH_AUTH_SOCK from the agents file.
  [[ ! -z "$SSH_AUTH_SOCK" ]] && {
    if [[ "$_PLATFORM" == "Linux" ]]; then
      # Linux has 'flock', thankfully.
      if exec 9>~/.ssh/agents.lock && flock -E 10 -w 0.5 9; then
        _GOT_LOCK=1
      else
        echo "$(tput setaf 1 || tput AF 1)Failed to obtain lockfile!$(tput op)"
        _SLEEP=3
      fi
    elif [[ "$_PLATFORM" == "Darwin" ]]; then
      # Do locking the sucky way on OSX.
      for ((I=0; I < 5; I++)); do
        if shlock -f "/tmp/agents.lock.$$" -p "$$"; then
          _GOT_LOCK=1
          break
        else
          sleep 0.1
        fi
      done
      [[ "${_GOT_LOCK:-0}" == "0" ]] && {
        echo "$(tput setaf 1 || tput AF 1)Failed to obtain lockfile!$(tput op)"
        _SLEEP=3
      }
    else
      echo "$(tput setaf 1 || tput AF 1)File locking unsupported - skipping clean up of agents file!$(tput op)"
      _SLEEP=3
    fi
    [[ "${_GOT_LOCK:-0}" == "1" ]] && {
      _pop_agent_sock || {
        echo -e "$(tput setaf 1 || tput AF 1)Failed to clean up agents file!$(tput op)"
        _SLEEP=3
      }
    }
    if [[ "$_PLATFORM" == "Linux" ]]; then
      exec 9>&-
    elif [[ "$_PLATFORM" == "Darwin" ]]; then
      rm -f "/tmp/agents.lock.$$"
    fi
  }

  # Kill the ssh-agent.
  (( $SHLVL == 1 )) && {
    [[ ! -z "$SSH_AGENT_PID" ]] && {
      ssh-agent -k >/dev/null 2>&1 || {
        echo -e "$(tput setaf 1 || tput AF 1)Failed to kill ssh-agent!$(tput op)"
        _SLEEP=3
      }
    }
  }
}
sleep ${_SLEEP:-0}