#! /bin/sh

if [ -z "$1" ]; then
   echo "Usage: $0 svn_url" >&2
   exit 1
fi

url="$1"

svn log --xml "$url" | grep -F author | sort -u |
   sed 's/^<[^>]\+>\(.\+\)<.\+>$/\1 = /' >>authors.txt