creates a notification for outdated homebrew packages

brew-update.sh

#!/bin/bash
#
# Notify of Homebrew updates via Notification Center on Mac OS X
#
# Author: Chris Streeter http://www.chrisstreeter.com
# Requires: terminal-notifier. Install with:
# gem install terminal-notifier or brew install terminal-notifier

TERM_APP='/Applications/Terminal.app'
BREW_EXEC='/usr/local/bin/brew'
TERMINAL_NOTIFIER='/usr/local/bin/terminal-notifier'
NOTIF_ARGS="-activate com.apple.Terminal"

$BREW_EXEC update 2>&1 > /dev/null
outdated=`$BREW_EXEC outdated | tr ' ' '\n'`

if [ -z "$outdated" ] ; then
  if [ -e $TERMINAL_NOTIFIER ]; then

    # No updates available
    exit 0
    # $TERMINAL_NOTIFIER $NOTIF_ARGS \
    #   -title "No Homebrew Updates Available" \
    #   -message "No updates available yet for any homebrew packages."
  fi
else
  # We've got an outdated formula or two

  # Nofity via Notification Center
  if [ -e $TERMINAL_NOTIFIER ]; then
    lc=$((`echo "$outdated" | wc -l`))
    outdated=`echo "$outdated" | tail -$lc`
    message=`echo "$outdated" | head -5`
    if [ "$outdated" != "$message" ]; then
      message="Some of the outdated formulae are:
      $message"
    else
      message="The following formulae are outdated:
      $message"
    fi
    # Send to the Nofication Center
    $TERMINAL_NOTIFIER $NOTIF_ARGS \
      -title "Homebrew Update(s) Available" -message "$message"
  fi
fi