if [[ -f $HOME/.nix-profile/share/chruby/chruby.sh ]]; then
    source $HOME/.nix-profile/share/chruby/chruby.sh
elif [[ -f /opt/arch/share/chruby/chruby.sh ]]; then
    source /opt/arch/share/chruby/chruby.sh
elif [[ -f /usr/local/share/chruby/chruby.sh ]]; then
    source /usr/local/share/chruby/chruby.sh
fi

_has-chruby() {
    type -f chruby >/dev/null 2>&1
}

_ruby-version() {
    local check_dir=$PWD
    local next_check_dir=${check_dir%/*}
    while [ "$next_check_dir" != "" ]; do
        if [[ -f "$check_dir/.ruby-version" ]]; then
            cat "$check_dir/.ruby-version"
            return
        fi
        check_dir="$next_check_dir"
        next_check_dir=${check_dir%/*}
    done
    if [[ -f $HOME/.ruby-version ]]; then
        cat $HOME/.ruby-version
        return
    fi
    false
}

_auto-chruby() {
    local ruby_version=$(_ruby-version)
    if [[ -n "${ruby_version}" ]]; then
        chruby "${ruby_version}"
    fi
}