brew-update-notifier.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:
#   brew install terminal-notifier

BREW_EXEC='/usr/local/bin/brew'
TERMINAL_NOTIFIER=`which terminal-notifier`
NOTIF_ARGS="-sender com.apple.Terminal"

$BREW_EXEC update 2>&1 > /dev/null
outdated=`$BREW_EXEC outdated --quiet`
pinned=`$BREW_EXEC list --pinned`

# Remove pinned formulae from the list of outdated formulae
outdated=`comm -1 -3 <(echo "$pinned") <(echo "$outdated")`

if [ -z "$outdated" ] ; then
    if [ -e $TERMINAL_NOTIFIER ]; then
        # No updates available
        $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    # We've got an outdated formula or two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        lc=$((`echo "$outdated" | wc -l`))
        outdated=`echo "$outdated" | tail -$lc`
        message=`echo "$outdated" | head -5`
        if [ "$outdated" != "$message" ]; then
            message="Some of the outdated formulae are: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            message="The following formulae are outdated: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

com.ponti.homebrew.update.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>EnableGlobbing</key>
    <false/>
    <key>Label</key>
    <string>homebrew.simonsimcity.update-notifier</string>
    <key>ProgramArguments</key>
    <array>
        <string>/bin/bash</string>
        <string>/usr/local/bin/homebrew-update-notifier</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>StandardErrorPath</key>
    <string>/tmp/homebrew.simonsimcity.update-notifier.err</string>
    <key>StandardOutPath</key>
    <string>/tmp/homebrew.simonsimcity.update-notifier.out</string>
    <key>StartCalendarInterval</key>
    <array>
        <dict>
            <key>Hour</key>
            <integer>10</integer>
            <key>Minute</key>
            <integer>0</integer>
        </dict>
        <dict>
            <key>Hour</key>
            <integer>15</integer>
            <key>Minute</key>
            <integer>0</integer>
        </dict>
    </array>
</dict>
</plist>