clone github to consistent local directories

clone-github.sh

#!/usr/bin/bash

clone-github () {
    local -r user_repo=$(sed -e "s|.*github.com/||" <<< $1)
    local -r dest="$HOME/github.com/$user_repo"
    if [[ -e $dest ]]; then
	echo "$dest already exists"
	echo "cd -- $dest"
	cd $dest
	return 1
    else
	git clone "git@github.com:$user_repo.git" $dest\
	    && cd $dest
    fi
}

alias gh=clone-github