bash-helper.sh

#!/usr/bin/env bash
BASEDIR=$(dirname "$0")

function fileName () {
    echo $(basename ${1%.*})
}

# define variables
FILES="$(find "$BASEDIR" ! -name 'index.sh' -type f -name '*.sh' -print | sort -t '\0' -n)"
TUSAGE="\\n"
HELP=false
FNPREFIX=''
USAGE=""
DESC=""
FOUND=false

# loop over script files
for FILE in $FILES; do
    if [ -f "$FILE" ]; then
        # shellcheck source=/dev/null
        . "$FILE" --source-only
        FNAME=`fileName $FILE`

        BUSAGE="$FNAME $USAGE"
        TUSAGE="$TUSAGE\\t$BUSAGE\\n              $DESC\n\n"
        USAGE=""
        if [[ "$1" = "$FNAME"  ||  "$FOUND" = true ]]; then
            FOUND=true
        fi
    fi
done

# add help to end of usage
TUSAGE="$TUSAGE\\t--help (shows this help output)\\n"


function namespaceRmDash () {
    echo "$1" | tr -d -
}

function namespaceUpperCase () {
    echo "$(echo "${1:0:1}" | tr '[:lower:]' '[:upper:]')${1:1}"
}

for ARG in "$@"; do
    if [[ "$ARG" = '--help' ]] || [[ "$ARG" = '-h' ]] || [[ "$ARG" = '--h' ]] || [[ "$ARG" = '-help' ]]; then
        HELP=true
    fi
done

function showUsage {
    printf "Usage: function <...args>\n"
    printf "$TUSAGE"
    exit 0
}

if [[ "$HELP" = true ]]; then
    showUsage
elif [[ ! -z "$@" && "$FOUND" = true ]]; then
    eval "$@"
else
    showUsage
fi