utilities for POSIX shell

utils.sh

# ask if something is ok, exit if it's not
# if OPTION_Y variable is "-y", do nothing
prompt_confirm () {
    if [ "$OPTION_Y" != "-y" ]; then
        printf "%s (y/n) " "$*"
        read -r PROCEED
        if [ "$PROCEED" != "y" ]; then
            echo "abort"
            exit
        fi
    fi
}

# if $1 exists, ask if its ok to delete and then delete
safe_delete () {
    if [ -f "$1" ]; then
        prompt_confirm "delete $1?"
        echo "deleting $1"
        rm "$1"
    fi
}

# if $1 exists, ask if its ok to overwrite
ask_overwrite () {
    if [ -f "$1" ]; then
        prompt_confirm "overwrite $1?"
    fi
}