#!/bin/bash

#-------------------------------------------------------------------------------
# Checks whether a supplied variable is defined or not
# Parameters: %variable%
#-------------------------------------------------------------------------------
function isDefined() {
	[[ ${!1-X} == ${!1-Y} ]]
}

#-------------------------------------------------------------------------------
# Checks whether a supplied variable is enabled or not
# Parameters: %variable%
#-------------------------------------------------------------------------------
function isEnabled() {
	case "${1}" in
		[Ee][Nn][Aa][Bb][Ll][Ee][Dd])
			return 0
			;;
		[Tt][Rr][Uu][Ee])
			return 0
			;;
		[Yy][Ee][Ss])
			return 0
			;;
		1)
			return 0
			;;
	esac
	return 1
}

#-------------------------------------------------------------------------------
# Checks whether a variable is defined and if value's length > 0
# Parameters: %variable%
#-------------------------------------------------------------------------------
function isSet() {
	if isDefined ${1}; then
		if [[ -n ${!1} ]]; then
			return 0
		fi
	fi
	return 1
}

#-------------------------------------------------------------------------------
# Loads EzBuild configuration
#-------------------------------------------------------------------------------
function loadConfiguration() {
	source ${EZROOT}/config/${EZNAME}.conf &> /dev/null || panic "Unable to load configuration files!\nYour EzBuild installation seems to be broken..."
	source ${EZROOT}/config/layout.conf &> /dev/null || panic "Unable to load configuration files!\nYour EzBuild installation seems to be broken..."
	source /etc/ezbuild/${EZNAME}.conf &> /dev/null || panic "Unable to load configuration files!\nYour EzBuild installation seems to be broken..."
	source /etc/ezbuild/layout.conf &> /dev/null || panic "Unable to load configuration files!\nYour EzBuild installation seems to be broken..."
}

#-------------------------------------------------------------------------------
# Loads all EzBuild Libraries
#-------------------------------------------------------------------------------
function loadLibraries() {
	source ${EZROOT}/libraries/colors &> /dev/null || panic "Unable to load necessary libraries!\nYour EzBuild installation seems to be broken..."
}

#-------------------------------------------------------------------------------
# Outputs error message and aborts program execution
# Parameters: %message%
#-------------------------------------------------------------------------------
function panic() {
	echo -e "FATAL ERROR: ${@}"
	exit 1
}

#-------------------------------------------------------------------------------
# Returns a UNIX timestamp
#-------------------------------------------------------------------------------
function timestamp() {
	echo $(date +%s)
}

#-------------------------------------------------------------------------------
# Returns lowercase string
# Parameters: %string%
#-------------------------------------------------------------------------------
function toLower() {
	echo "${@}" | tr '[:upper:]' '[:lower:]'
}

#-------------------------------------------------------------------------------
# Returns uppercase string
# Parameters: %string%
#-------------------------------------------------------------------------------
function toUpper() {
	echo "${@}" | tr '[:lower:]' '[:upper:]'
}

#-------------------------------------------------------------------------------
# Returns only the first part of a string, delimited by tabs or spaces
# Parameters: %string%
#-------------------------------------------------------------------------------
function trim() {
	echo ${1}
}