# This script substitutes path to files in diff headers:
#   Index: a/b/c/file.x
#   *** file.x .....
# becomes
#   Index: a/b/c/file.x
#   *** a/b/c/file.x .....

/^Index\:/{
	n = split ($2, pnf, "/");
	path = "";
	for (i=1;i<n;i++)
		path = path pnf[i] "/";
	file = pnf[n];
	skip_hunk = file == "ChangeLog";
	if (!skip_hunk) print;
	next;
}
($1 == "***" || $1 == "---" || $1 == "+++") && $2 == "nul" {
	$2 = "/dev/null"
}
($1 == "***" || $1 == "---" || $1 == "+++") && $2 == file {
	$2 = path file;
	if (!skip_hunk)	print;
	next;
} {
	if (!skip_hunk)	print;
}