asdf-get-asdf-bin

#!/usr/bin/env bash
set -euo pipefail

#- asdf-get-asdf-bin 1.0
## Usage: asdf-get-asdf-bin
## Print the ASDF_BIN environment variables as it would be set after enabling 'asdf'.
##
##   -h, --help     Display this help and exit
##   -v, --version  Output version information and exit

if { getopt --test >/dev/null 2>&1 && false; } || [[ "$?" = "4" ]] || false; then
    ARGS=$(getopt -o hv -l help,version -n $(basename ${BASH_SOURCE[0]}) -- "$@") || sh_script_usage
    eval set -- "${ARGS}"
fi

while [[ $# -gt 0 ]]; do
    case "$1" in
        -h|--help)
            sh_script_usage
            ;;
        -v|--version)
            sh_script_version
            ;;
        --)
            shift
            break
            ;;
        -*)
            sh_script_usage
            ;;
        *)
            break
            ;;
    esac
done
[[ $# -eq 0 ]] || sh_script_usage

# command is defined and is a function (no path)
[[ "$(command -v asdf 2>&1)" = "asdf" ]] || {
    # using a less exact call because 'brew --prefix asdf' is very very slow
    # BREW_ASDF_DIR=$(brew --prefix asdf 2>/dev/null || true)
    BREW_ASDF_DIR=$(brew --prefix)/opt/asdf
    ASDF_SH=
    [[ ! -f /opt/.asdf/asdf.sh ]] || ASDF_SH=/opt/.asdf/asdf.sh
    [[ ! -f ${HOME}/.asdf/asdf.sh ]] || ASDF_SH=${HOME}/.asdf/asdf.sh
    [[ ! -f ${XDG_CONFIG_HOME:-}/asdf/asdf.sh ]] || ASDF_SH=${XDG_CONFIG_HOME}/asdf/asdf.sh
    [[ ! -f ${BREW_ASDF_DIR}/asdf.sh ]] || ASDF_SH=${BREW_ASDF_DIR}/asdf.sh
    [[ ! -f ${BREW_ASDF_DIR}/libexec/asdf.sh ]] || ASDF_SH=${BREW_ASDF_DIR}/libexec/asdf.sh

    [[ -n ${ASDF_SH} ]] || {
        >&2 echo "$(date +"%H:%M:%S")" "[WARN] Couldn't find asdf in any of the known locations."
        exit 0
    }
    NOUNSET_STATE="$(set +o | grep nounset)"
    set +u
    source ${ASDF_SH}
    eval "${NOUNSET_STATE}"
    unset NOUNSET_STATE
}

[[ -z "${ASDF_DIR:-}" ]] || echo ${ASDF_DIR}/bin