Google Chrome app creation script for OS X. I found a post on LifeHacker with a similar script so I used that to work out the icon creation which I was having issues with.

ChromeAppMaker.sh

#!/bin/sh

# Local application path. The default is /Applications but I tend to separate
# my apps in the sub directories, e.g. /Applications/Internet
app_root="/Applications"
path_chrome="$app_root/Google\ Chrome.app/Contents/MacOS/Google\ Chrome"

# Everything below should be good as is, the script is interactive.
# 1 Name
# 2 URL
# 3 Icon
########################################################################

# Name your app
echo "Name the application with no spaces (e.g. Chrome-Gmail or Chrome_Gmail)"
read app_name

# URL this app will run
echo "App Url (e.g. https://mail.google.com/mail/ca/u/0/#inbox)"
read app_url

# Icon for the app
echo "Application icon path (e.g. /Users/{user}/Pictures/gmail-app_icon.jpg)"
echo "(Hint: you can just drag and drop it on the  terminal)"
read app_icon

# Resource paths
path_exec="$app_root/$app_name.app/Contents/MacOS"
path_plist="$app_root/$app_name.app/Contents/Info.plist"
path_profile="$app_root/$app_name.app/Contents/Profile"
path_resources="$app_root/$app_name.app/Contents/Resources"

# Create the directories
mkdir -p $path_exec $path_profile $path_resources

# Create the app and make it executable
cat > $path_exec/$app_name <<EOF
#!/bin/sh
exec $path_chrome --app="$app_url" --user-data-dir="$path_profile" "\$@"
EOF
chmod +x $path_exec/$app_name

# Convert the app_icon with sips and copy it into Resources
# This was figured out by looking at the lifehacker script
if [ -f $app_icon ] ; then
    sips -s format tiff $app_icon --out $path_resources/icon.tiff --resampleWidth 128 >& /dev/null
    tiff2icns -noLarge $path_resources/icon.tiff >& /dev/null
fi

# Create the Info.plist
cat > $path_plist <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" “http://www.apple.com/DTDs/PropertyList-1.0.dtd”>
<plist version=”1.0″>
<dict>
  <key>CFBundleExecutable</key>
  <string>$app_name</string>
  <key>CFBundleIconFile</key>
  <string>icon</string>
</dict>
</plist>
EOF

# Done, show the app.
open $app_root