custom-shell-scripts/array_join at main · jmortiger/custom-shell-scripts · GitHub

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#!/usr/bin/env bash

##region########################################### HELP & VERSION ###########################################
_show_help() {
	cat << __EOF__
Join each value in the array/list with the separator. Similar to Bash's array[*], but allows for a separator of multiple characters.

Usage:	$0 SEPARATOR VAL1 VAL2...
	or:	$0 (-s | --separator) SEPARATOR VAL1 VAL2...
	or:	$0 --help
	or:	$0 --version

Options:
	-h, --help: Shows this help text.
	-v, --version: Shows version info.
	-s, --separator SEPARATOR: The string placed between each entry. Can be an empty string.
__EOF__
}
_show_version() {
	cat << __EOF__
$0 3.0.0

Copyright (C) 2025 Justin Morris
__EOF__
}
##endregion######################################## HELP & VERSION ###########################################

declare separator=
while [[ "$1" =~ ^- ]]; do
	case "$1" in
		(-h | --help)
			_show_help
			exit
			;;
		(-v | --version)
			_show_version
			exit
			;;
		(--)
			shift
			break
			;;
		(-s | --separator)
			shift
			declare -r separator="$1"
			shift
			;;
		(*)
			# if [[ -n "${opt1+x}" ]]; then
			# 	if [[ -n "${opt2+x}" ]]; then
			# 		if [[ -n "${opt3+x}" ]]; then
			# 			exit 1
			# 		else
			# 			opt3="$1"
			# 		fi
			# 	else
			# 		opt2="$1"
			# 	fi
			# else
			# 	opt1="$1"
			# fi
			# shift
			break
			;;
	esac
done

if declare -r separator="$1" && ! shift; then exit 1; fi
result="$1"
while (($# > 0)) && shift; do result+="$separator$1"; done
# TODO: Option to enable escape sequences
echo -nE "$result"
exit