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git/export: diff added or deleted files against /dev/null

--- a/export

+++ b/export

@@ -57,8 +57,15 @@

 			next

 		}

 		{print; printf "\n"}'

-		for(f in $fc)

-			ape/diff -urN a/$f b/$f

+		for(f in $fc){

+			a=a/$f

+			if(! test -e $a)

+				a=/dev/null

+			b=b/$f

+			if(! test -e $b)

+				b=/dev/null

+			ape/diff -urN $a $b

+		}

 	} >$patchfile

 	if(~ $#patchdir 0){

 		cat $patchfile