launch-steam.sh

#!/bin/bash
# requires fltk-dialog to be in PATH
# https://github.com/darealshinji/fltk-dialog/releases/tag/continuous

steamconfig="${HOME%/}/.steam"
pidfile="$steamconfig/steam.pid"
steambin="$steamconfig/steam/steam.sh"
logfile="$(mktemp)"
pid_steam=0
pid_launcher=0

# check PID file
if [ -r "$pidfile" -a -s "$pidfile" ]; then
  pid_steam=$(cat "$pidfile")
fi

# launch Steam
if [ ! -x "$steambin" ]; then
  "$steambin" &  # show a useful error message
  fltk-dialog --title="Error" --text="Cannot launch Steam!" --center
  exit 1
fi
"$steambin" 2>&1 | tee "$logfile" &

if [ $pid_steam -ne 0 ]; then
  # exit if Steam was already running
  if kill -0 $pid_steam 2>/dev/null ; then
    exit 0
  fi

  # find an icon to use for the message window
  icon="$(find /usr/share/icons/hicolor/ -name steam.png | sort -V | tail -1)"
  if [ -z "$icon" ] && [ -f "/usr/share/pixmaps/steam.png" ]; then
    icon="/usr/share/pixmaps/steam.png"
  else
    icon="$steamconfig/steam/public/steam_tray.ico"
  fi

  # show a message window indicating that Steam is about to start
  fltk-dialog --title="Steam" \
    --text="Launching Steam client..." \
    --cancel-label="Hide" \
    --icon="$icon" \
    --progress \
    --pulsate \
    --center \
    --no-escape \
    --undecorated &
  pid_launcher=$!

  # close message window after the Steam client has launched
  if [ $pid_launcher -ne 0 ]; then
    #while ! kill -0 $pid_steam 2>/dev/null ; do
    #  sleep 0.3
    #  pid_steam=$(cat "$pidfile")
    #done
    while ! grep -q "^CApplicationManagerPopulateThread" "$logfile" ; do
      sleep 0.3
    done

    kill $pid_launcher
    rm -f "$logfile"
  fi
fi

exit 0