local pkgpath
if (( $# == 1 )); then
    pkgpath="$1"
else
    echo >&2 "Usage: $0 PATH"
    echo >&2
    echo >&2 "psd stands for \"pkgsrc pushd\", alias to pushd \${PKGSRCDIR}/\${PATH}"
    return 1
fi

local pkgsrcdir
if [[ -n "${PKGSRCDIR}" ]]; then
    pkgsrcdir="${PKGSRCDIR}"
else
    local -a candidates=(
        "/usr/pkgsrc"
        "/opt/pkgsrc"
    )

    local dir
    for dir in "${candidates[@]}"; do
        if [[ -d "$dir" ]]; then
            pkgsrcdir="$dir"
            break
        fi
    done

    if [[ -z "$pkgsrcdir" ]]; then
        echo >&2 "PKGSRCDIR not detected"
        return 1
    fi
fi

pushd "${pkgsrcdir}/${pkgpath}"

# Local Variables:
# mode: sh
# sh-shell: zsh
# End: