#!/bin/bash

function chr {
	printf -v chr \\\\%o $1
	printf -v chr $chr
}

function asc {
	local arg="${1:0:1}"
	local -i upper=256
	local -i lower=0
	until
		let asc=(upper+lower)/2
		chr $asc
		[ "$chr" == "$arg" ]
	do
		if [ "$chr" '>' "$arg" ]
		then
			let upper=asc
		else
			let lower=asc
		fi
	done
}

function url_escape {
	local c
	url_escape=''
	for ((i=0; i<${#1}; i++))
	do
		c="${1:$i:1}"
		[[ "$c" == [-\!\$\'\(\)\*+,.0-9A-Z_a-z] ]] || {
			asc "$c"
			printf -v c %%%02X $asc
		}
		url_escape="$url_escape$c"
	done
}

function google_search {
	url_escape "$1"
	echo "http://www.google.com/search?q=$url_escape&hl=en"
}

IFS=+
google_search "$*"