Rick roll terminal prank

rick-roll-terminal.sh

#!/bin/bash
#
# some shortcomings:
# - prankee needs to be running rvm, rbenv, or some other
#   ruby version manager that doesn't require sudo permissions to
#   install gems.
# - can be killed by simply closing current tab/session
#
# Any bug reports or suggestions on improvements are welcome!
#
# Execute by running: 
#   curl -sL https://goo.gl/WpRkMx | sh
# 
# if you want it to run continuously, every 3 seconds or so:
#   ( while true; do sleep 3; curl -sL https://goo.gl/WpRkMx | sh; done ) & disown && clear

uninstall_imagemagick=
uninstall_catpix=

# cleanup
cleanup() {
  if [ uninstall_imagemagick ]; then
    brew uninstall imagemagick &> /dev/null
  fi
  
  if [ uninstall_catpix ]; then
    gem uninstall -x catpix &> /dev/null
    source ~/.bash_profile
  fi
  
  rm DS_Store.jpg
}

(
  cd ~/Downloads

  if ! $(brew list imagemagick &>/dev/null); then
    uninstall_imagemagick=true
    brew install imagemagick &>/dev/null
  fi

  if ! hash catpix &>/dev/null; then
    uninstall_catpix=true
    gem install catpix &>/dev/null
    source ~/.bash_profile
  fi

  # you can choose any rick roll pic from the interwebs and replace the link
  curl -s "https://i.ytimg.com/vi/alB3TDZMKDQ/maxresdefault.jpg" -o "DS_Store.jpg" &> /dev/null
  catpix DS_Store.jpg -w 0.75 -c xy -r high

  cleanup
)