plan9fox/rc/bin/diffy

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#!/bin/rc
# diffy [diff-opts] file... - diff file against yesterday's version(s)
rfork e
diffopts=()
while(! ~ $#* 0 && ~ $1 -* && ! ~ $1 --){
diffopts=($diffopts $1)
shift
}
if(~ $1 --)
shift
if(! ~ $#* 1)
diffopts=($diffopts -m)
for(f)
diff $diffopts `{yesterday $f} $f