ref: 04c4a9ca8b06e34a203f7ddacc2263cf2077e1aa
dir: /acme/bin/adiff/
#!/bin/rc
if(~ $#* 0 1){
echo >[1=2] usage: adiff file1 file2
echo >[1=2] or adiff file1 file2... dir
exit usage
}
dir = /mnt/wsys
if(! test -f $dir/cons)
dir = /mnt/term/$dir
id=`{cat $dir/new/ctl}
id=$id(1)
l=$1
r=$2
if (test -d $1) l=$1/`{basename $2}
if not if (test -d $2) r=$2/`{basename $1}
echo 'name '^`{pwd}^/-diff-^`{basename $l} > $dir/$id/ctl
diff $* | awk -v 'l='$l -v 'r='^$r '/^diff/ {l=$2; r=$3; next} /^[1-9]/ {sub("[acd]", " & " r ":"); sub("^", l ":", $0)}
{print $0}' > $dir/$id/body
echo clean > $dir/$id/ctl