Randomize id attributes in a svg (or other markup)

randomize-id.sh

#!/bin/bash

set -euo pipefail

help() {
	cat <<-EOF >&2
		Usage:
		  $0 [-h|-v|-i ...] <path>

		Options:
		  -v|--verbose	Print replacements.
		  -i|--ignore ...	Comma separated list of IDs to ignore.
	EOF
}

if test -z "$*"; then
    help
    exit 1
fi

options=$(getopt -n "$0" -o hvi: -l help,verbose,ignore -- "$@")

if test $? -ne 0; then
	exit 1
fi

eval set -- "$options"

ignore=""
verbose=""

while :; do
	case "$1" in
		-i|--ignore)
			ignore="$2"
			shift 
			shift 
			;;
		-v|--verbose)
			verbose="yes"
			shift 
			;;
		-h|--help)
			help
			exit
			;;
		--)
			shift
			break
			;;
	esac
done

grep -Po 'id="\K[^"]+' $1 | while read id; do
	if echo ",$ignore," | grep -q ",$id,"; then
		test -n "$verbose" && echo "Ignoring '$id'"
		continue
	fi
	replacement="id$(openssl rand -hex 2)"
	test -n "$verbose" && echo "Replacing '$id' with '$replacement'"
	sed -i "s/$id/$replacement/g" $1
done