add usage, environment injection and arg validation

#!/bin/bash

TMP=$(mktemp)

ENV=${1:-mantid} ; shift

CMD=${2:-ScriptToExecuteWithProfile.py} ; shift

_usage() {

    echo "usage: $0 <environment> [--classic] <script> [tool arguments]"

    if [[ "$OSTYPE" == "darwin"* ]]; then

        echo "MACOS is unsupported for mantid-profiler at this time due to an issue in psutil."

    fi

}

# execute main app in background

# overwrite these values with environment injection e.g.

# PIXI_PREFIX=path-to-parent-folder nsd-mantid-profile-wrap.sh mantid_dev --classic script.py

# PROFILE_ENV=mantid nsd-mantid-profile-wrap.sh mantid --classic script.py

# PROFILE_OPT="--outfile path-to-html" nsd-mantid-profile-wrap.sh mantid --classic script.py

PIXI_PREFIX="${PIXI_PREFIX:=/usr/local/pixi}"

PROFILE_ENV="${PROFILE_ENV:=mantid_dev}"

read -r -a PROFILE_OPT <<< "${PROFILE_OPT//[\(\)]/}"	# ensure PROFILE_OUT is an array

# select the environment to use

ENV=

if [ -n "$1" ]; then

    case $1 in

    --h*|-h)

        _usage

        exit 0

        ;;

    *)

        ENV="$1"

        shift

        ;;

    esac

else

    echo "Must specify an environment to activate"

    _usage

    exit 255

fi

# consume option parameters

while [[ ${1} =~ ^- ]] ; do

    case $1 in

    --classic)  # supported for nsd-conda-wrap.sh so accept it without fuss

        ;;

    --debug)    # print commands as they are executed

        set -x

        ;;

    *)

        break

        ;;

    esac

    shift

done

# select the script to use

CMD="${1:-}"

shift

if [ -z "$CMD" ] ; then

    echo "Must specify a script to run"

    _usage

    exit 255

fi

# execute main app in background

TMP=$(mktemp)

nsd-conda-wrap.sh ${ENV} --classic ${CMD} $@ > ${TMP} & pid=$!

# https://unix.stackexchange.com/questions/427115/listen-for-exit-of-process-given-pid-pid

trap 'tail --pid $pid -f /dev/null' EXIT

# deal with background app under CTRL-C and exit conditions

trap 'set -x ; kill -HUP $pid' SIGINT

trap 'set -x ; wait $pid' EXIT

# execute profile process in foreground

nsd-conda-wrap.sh mantid_dev --classic -m mantidprofiler ${pid} --outfile ${TMP}.html && echo "Wrote ${TMP}.html"

args=("$PROFILE_ENV" "--classic" "-m" "mantidprofiler")

args+=(${PROFILE_OPT[@]})

args+=("${pid}")

if nsd-conda-wrap.sh ${args[@]} ; then

    # https://superuser.com/a/1732848

    if [[ "${PROFILE_OPT[@]}" =~ "--outfile ([^ ]+) " ]]; then

        echo "Wrote ${BASH_REMATCH[1]}"

    else

        echo "Wrote $(pwd)/profile.html"

    fi

fi