#!/bin/sh

# Defaults, each of which are overidable from the command line
FORMAT="jpeg"
SIZE="112x112"

bail(){
	if [ "$1" = "-1" ]; then
		echo "Please specify a valid .app to extract an icon from."
		exit -1 
	fi
}
ParseInput () {

        if [ $# -eq 0 ]; then
                echo "Usage: Anything contained in []'s are optional."
                echo "Usage: $0 -a <name_of_application>.app [-s] <output_size> [-f] <output_format>"
        exit -1;
        fi
        while [ -n "$1" ] # Parse the command line
        do
                case $1 in
                -[Aa])
                		APP_NAME=$(echo $* | sed -e 's/-s.*$//' -e's/^-a //' -e 's/^[ \t]*//;s/[ \t]*$//' );
                        shift
                        ;;
                -[Ss])
						SIZE=$2;
                        shift
                        ;;
                -[Ff])
                        FORMAT=$2;
                        shift
                        ;;
		   -*)
                        echo "ERROR: Bad flag \"$1\".";
                        exit -1;
                        ;;
                esac
                shift
        done

        if [ "x$APP_NAME" = "x" ]; then
			bail "-1"
		elif [ "$(echo "$APP_NAME" | sed -e  's/^.*\.//' -e 's/\/.*$//')" != "app" ]; then
			bail "-1"
		elif [ ! -d "$APP_NAME" ]; then
			bail "-1"
		fi
}

if [ "$FORMAT" = "jpeg" ]; then
	FORMATPROPER=$(echo "$FORMAT" | sed 's/e//')
fi

ParseInput $*

icnsfile="$(ls "$APP_NAME"/Contents/Resources | grep .icns)"

for i in $(echo "$icnsfile")
do
	echo -e "Convert $i? (y or n): \c"
	read convert
        if [ "$convert" = "y" ]; then
       		echo -e "Please specify an output filename (example icon.$FORMATPROPER): \c"
       		read output
			echo "sips -Z $SIZE -s format $FORMAT \""$APP_NAME"/Contents/Resources/$i\" --out ~/Desktop/$output 2>&1 >>  /dev/null" | sh
            
        else
        	echo "$i - skipping"
        fi
done