Script to normalize an XSM Flask policy

format-xsm-policy.sh

#!/bin/bash

# pipe an expanded XSM Flask policy.conf in:
#  $0 < policy.conf
#
# The script chokes on booleans, edit policy.conf to remove
#  "if ( ) { } else { } " and just leave the case you want to evaluate.

set -o noglob

debug() {
	[ -z "$DEBUG" ] && return
	echo "$@"
}

print_line() {
	l="$@"
	l=$( echo $l )

	case $l in
	*{*)
		;;
	*)
		echo $l
		return
		;;
	esac

	header="${l%\{*}"
	footer="${l#*\}}"
	props="${l#*\{}"
	props="${props%\}*}"

	sorted=$( echo $props | awk -v RS=' ' -v ORS="\n" '{print}' | sort | xargs )

	for l in $sorted ; do
		echo "$header{" $l "}$footer"
	done
}

holding=0

while read line ; do
	line=${line//^[ \t]*/}
	line=${line//#*/}
	[ -z "$line" ] && continue
	case $line in
	^$)
		debug empty line
		continue
		;;
	^[#]*)
		debug comment
		continue
		;;
	*{*}*|*}*{*)
		if [ $holding -gt 0 ] ; then
			debug holding one line
			hold="$hold $line"
		else
			debug printing one line
			print_line $line
		fi
		;;
	*{*)
		debug opening "{"
		hold="$hold $line"
		holding=$(( holding + 1 ))
		;;
	*}*)
		debug closing "}"
		holding=$(( holding - 1 ))
		print_line "$hold $line"
		hold=
		;;
	*)
		if [ $holding -gt 0 ] ; then
			debug holding line
			hold="$hold $line"
		else
			debug printing line
			print_line $line
		fi
		;;
	esac
done