Plan 9 from Bell Labs’s /usr/web/sources/plan9/rc/bin/diffy

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


#!/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)
if (~ $#* 0)
	* = (.)
for(f)
	diff $diffopts `{yesterday $f} $f

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