lib-bash

#!/bin/bash

space=$' '
tab=$'\t'
newline=$'\n'
cr=$'\r'

# The docker-compose .env file is *not* compatible with shell.  Quotes
# become part of the variable.  Hence the need for this complex
# function.

declare -A compose_envvar
compose_env_read() {
	[[ ! -e $1 ]] && return
	local continuation= line name value
	set -x
	while read line; do
		if [[ $continuation ]]; then
			if [[ $line =~ '\\'$ ]]; then
				value+="${line%\\}"
			else
				compose_envvar["$name"]="$value$line"
				continuation=
			fi
		else
			if [[ $line =~ ^[$space$tab]*'#' ]]; then
				: #comment
			elif [[ $line =~ ^[$space$tab]*([^=$space$tab]+)'='(.*)$ ]]; then
				name="${BASH_REMATCH[1]}"
				value="${BASH_REMATCH[2]}"
				if [[ $value =~ \\$ ]]; then
					value="${value%\\}"
					continuation=1
				else
					compose_envvar["$name"]="$value"
				fi
			elif [[ $line = '' ]]; then
				:
			else
				echo "Can't parse line: $line"
				exit 1
			fi
		fi
	done < "$1"
}

RANDOM_MATRIX="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

_create_random_value() {
	local LENGTH VALUE
	LENGTH="$1"
	shift
	VALUE=
	while [ "${n:=1}" -le "$LENGTH" ]; do
		VALUE="$VALUE${MATRIX:$(($RANDOM%${#RANDOM_MATRIX})):1}"
		let n+=1
	done
	echo "$VALUE"
}

_ensure_compose_var_randomly() {
	local name="$1" length="$2" func="$3" random_value
	shift 3

	[[ ${compose_envvar[$name]} ]] && return
	while random_value="$(_create_random_value $length)"; do
		$func "$random_value" "$@" && break
	done
	compose_envvar[$name]="$random_value"
}

if ! [[ -d $service_directory ]]; then
	echo "Service directory($service_directory) does not exist!"
	exit 1
fi