script to diff local PKGBUILD with AUR pkgbuild

aurdiff.sh

#!/bin/bash
# Source: https://bbs.archlinux.org/viewtopic.php?pid=853603#p853603
# Author: falconindy

DIFF=${DIFF:-diff}

if [[ ! -f PKGBUILD ]]; then
  echo "error: No PKGBUILD found in working directory."
  exit 1
fi >&2

eval $(grep '^pkgname=' PKGBUILD)
if [[ -z $pkgname ]]; then
  echo "error: pkgname not found in PKGBUILD"
  exit 1
fi >&2

diff ${@:--u} PKGBUILD <(curl -s "http://aur.archlinux.org/packages/$pkgname/$pkgname/PKGBUILD")