Undo trailing whitespace changes in working copy

git-revert-whitespace.sh

#!/bin/sh
#

patch=$( mktemp .tmp.git.XXXXXX )

git diff --ignore-space-at-eol $@ > $patch

if [ $? -eq 0 ]; then

	# detect EOF change
	tail -n 7 $patch | awk -F "\n" '
FNR == 1 && ! /^@@ -[0-9]/ { exit 1 }
FNR == 5 && ! /^-/ { exit 1 }
FNR == 6 && ! /^\\ No newline at end of file$/ { exit 1 }
FNR == 7 && ! /^+/ { exit 1 }

FNR == 5 { a = substr($0, 2) }
FNR == 7 { if (a != substr($0, 2)) exit 1 }
'

	# strip EOF change
	if [ $? -eq 0 ]; then
		tmp=$( mktemp .tmp.git.XXXXXX )
		head -n -7 $patch > $tmp
		mv $tmp $patch
	fi

	git checkout $@

	if [ $? -eq 0 ]; then
		[ $( wc -l < $patch ) -gt 2 ] && patch -p1 < $patch
		[ $? -eq 0 ] && rm $patch
	fi
fi