#!/bin/bash
#
# Copyright (C) 2010-2011 Greg Methvin
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

APP_PATH=/Applications/Chromium.app
URL_PREFIX='http://build.chromium.org/f/chromium/snapshots/Mac'
TMPDIR="/tmp/chromium_updater_$$"

LATEST=$(curl -s $URL_PREFIX/LATEST)
INSTALLED=$(defaults read /Applications/Chromium.app/Contents/Info SVNRevision 2>/dev/null)

if [[ $LATEST -eq $INSTALLED ]]; then
    echo "You have the latest version of Chromium ($LATEST)"
    exit 0
fi

[[ -f $TMPDIR ]] || mkdir $TMPDIR || exit 1

# clean up on exit
cleanup () {
    if [[ -e $TMPDIR ]]; then
        echo 'Removing temporary files';
        rm -rf $TMPDIR;
    fi
}
trap cleanup EXIT

echo "Retrieving the latest version ($LATEST)"
curl -# "$URL_PREFIX/$LATEST/chrome-mac.zip" -o $TMPDIR/chrome-mac.zip

if [[ -n $(ps x | grep '\bChromium\b') ]]; then
    echo -n "Chromium is running. Kill it? (y/n) [y] "
    read cankill
    if [[ -z $cankill || $cankill == y ]]; then
        killall -9 Chromium 2>/dev/null
    else
        echo "Chromium must be closed before updating"
        exit 1
    fi
fi

echo "Unzipping"
unzip -qq -o $TMPDIR/chrome-mac.zip -d $TMPDIR || exit 1

echo "Moving new version to /Applications"
rm -rf $APP_PATH && mv -f $TMPDIR/chrome-mac/Chromium.app $APP_PATH || exit 1

cleanup

echo "Chromium is up to date"