#!/bin/bash
# -*- sh -*-

# Takes on stdin a file formated like the official UnicodeData list;
# Writes on stdout a list of chars that don't get a fallback

if [ $# != 2 ]
then
    echo >&2 "Usage: $(basename $0) FULL_PATTERN HOPEFULL_PATTERN"
    echo >&2 "          < UnicodeData-2.txt >out.nofallback"
    exit 1
fi

FULL_PATTERN=$1
HOPEFULL_PATTERN=$2

FILE=/tmp/file.$$
cut -d\; -f1,2 >$FILE

cat << EOF
#
# List of characters matching:
# '${HOPEFULL_PATTERN}'
# that don't get a fallback using:
# FULL_PATTERN='${FULL_PATTERN}'
#
# Auto-generated by $(basename $0) from UnicodeData list 
#
# ** DO NOT EDIT MANUALLY **
#

EOF

egrep < $FILE -f <(echo ";${HOPEFULL_PATTERN}") |
    egrep -v -f <(echo ";${FULL_PATTERN}$")

rm $FILE