array_slice

#!/usr/bin/env bash

declare -i start=0; unset start; declare -i start
declare -i end=0; unset end; declare -i end
declare f_isLength='false'
# Is end of range exclusive?
declare f_isExclusive='true'
declare -n opt1=start opt2=end
while [[ -n "${1+x}" ]]; do
	case "$1" in
		(-h | --help)
			# show_help
			exit 1
			;;
		(-v | --version)
			# show_version
			exit 1
			;;
		(-e | --exclusive)
			declare -r f_isExclusive='true'
			shift
			;;
		(-i | --inclusive)
			declare -r f_isExclusive='false'
			shift
			;;
		(-l | --length)
			declare -r f_isLength='true'
			if [[ "$1" =~ ^--length=(-?[[:digit:]]+)$ ]]; then
				declare -i end="${BASH_REMATCH[1]}"
			elif [[ "$2" =~ ^-?[[:digit:]]+$ ]] && [[ -z "${end+x}" ]]; then
				declare -i end="$2"
				shift
			fi
			shift
			;;
		(--)
			shift
			break
			;;
		([-+]?[[:digit:]]+)
			if [[ -n "${opt1+x}" ]]; then
				if [[ -n "${opt2+x}" ]]; then
					break
				else
					opt2="$1"
				fi
			else
				opt1="$1"
			fi
			shift
			;;
		(*) break ;;
	esac
done
declare -ri totalLength=$#
if eval "$f_isLength" && ((end < 0)); then
	# TODO: Length out of bounds
	exit 1
fi
# Convert negative indices
((start += start < 0 ? totalLength : 0, end += end < 0 ? totalLength : 0))
# Force exclusive end
if ! eval "$f_isLength" && ! eval "$f_isExclusive"; then ((end++)); fi
declare -ri start end
if ((start >= totalLength)); then
	# TODO: Start out of bounds
	exit 1
elif eval "$f_isLength" && ((end > totalLength)); then
	# TODO: Length/end out of bounds
	exit 1
elif ! eval "$f_isLength" && ((end > totalLength)); then
	# TODO: End out of bounds
	exit 1
fi
if ((start = 0 && end ))
declare -a inputArray=("$@")
for ((i = 1; i <= start; i++)); do
	
done
while (($# > 0)) && shift; do
	if [ "$1" = "$toRemove" ]; then
		if eval "$f_all"; then
			continue
		elif shift; then
			result+=("$@")
		fi
		break
	fi
	result+=("$1")
done
echo "${result[@]}"
exit