#!/bin/sh
if [ "$XDG_SESSION_TYPE" = "x11" ]; then
  # require xclip(see http://stackoverflow.com/questions/592620/check-if-a-program-exists-from-a-bash-script/677212#677212)
  command -v xclip >/dev/null 2>&1 || { echo >&1 "no xclip"; exit 1; }
  # write image in clipboard to file (see http://unix.stackexchange.com/questions/145131/copy-image-from-clipboard-to-file)
  filePath=`xclip -selection clipboard -o 2>/dev/null | grep ^file:// | cut -c8-`
  if [ ! -n "$filePath" ] ;then
    if
        xclip -selection clipboard -target image/png -o >/dev/null 2>&1
    then
        xclip -selection clipboard -target image/png -o >$1 2>/dev/null
        echo $1
    else
        echo "no image"
    fi
  else
    echo $filePath
  fi
elif [ "$XDG_SESSION_TYPE" = "wayland" ]; then
  command -v wl-paste >/dev/null 2>&1 || { echo >&1 "no wl-clipboard"; exit 1; }
  isImage=`wl-paste --list-types | grep image`
  if [ -n "$isImage" ]; then
    wl-paste --type image/png > $1 2>/dev/null
    echo $1
  else
    echo "no image"
    exit 1
  fi
else
  # fallback for unsupported session types
  echo >&2 "Error: Unsupported session type '$XDG_SESSION_TYPE'."
  echo >&2 "Solution: The variable of XDG_SESSION_TYPE must set as 'x11' or 'wayland'."
  exit 1
fi