/usr/bin/env oksh
Generates a fortune file of Ursula K. Le Guin's 
edition of the Dao De Jing
Thanks to Nicholas Bennett/lovingawareness for 
transcribing the original text to markdown.
U="https://raw.githubusercontent.com/lovingawareness/tao-te-ching/master/Ursula%20K%20Le%20Guin.md"
T=$(mktemp)
trap "rm -f $T" EXIT
O=ddj.txt
alias P='cat -s'
function H {
	head -$1 $2
}
function L { 
	grep -n "$1" $T|cut -d: -f1|H 1 
} 
function C {
	H $1 $3|tail -$2
}
function S {
	sed -e 's/##? //g;s/^[[:space:]]+//' $1|tr -s '%'
}
[ -f $T ]&&curl -s $U>$T||exit 1
l=$(L '# 1')
for i in $(seq 2 82);do 
	ol=$l
	l=$([ $i -lt 82 ]&&L "# $i"||L '# Note')
	((h=$l-1))
	((t=$l-$ol))
	c=$(C $h $t $T|L '>')
	[ $c -gt 0 ]&&((c=$c-1))&&C $h $t $T|H $c|S|P>>$O||C $h $t $tmp|S|P>>$O
	[ $i -lt 82 ]&&print %>>$O
done