As a Bash scripter, I want to be able to handle required positional parameters without updating my $# compare to see if enough were supplied constantly

!BashMadness.md

Bash Madness

This was conceived out of a desire to avoid if [ -z $1 ]; then echo "SomeVar required"; exit 1; fi for all the positionals since the number I want to handle might change. Eventually it may handle shift and named or - or -- delimited arguments, but we are starting of simple slow.

magic-args.sh

#!/bin/bash
set -Eeu

args () {
  prefix=ARG_
  ARG_FIRST=$1
  ARG_SECOND=$2
  ARG_ETC=$3
  for eacharg in "${varargs[@]}"; do arglist+=(${eacharg/ARG_/}=${!eacharg}); done
}
# This takes all the arguments to the script and passes to the function to handle assigning to variables
args "$@"

# Source the list we assembled, functionally the same as `eval "${arglist[@]}"`
. <(${arglist[@]})

empty_function () {
echo $FIRST
echo $SECOND
}
# This prints the values that should be inherited from the parent/script scope which should resolve to the arguments to the test-script.sh
empty_function

new_function () {
echo $1
echo $2
}
# This prints the values passed into it which should resolve to the arguments to the magic-args.sh
new_function $FIRST $SECOND