ref: 54ef5ea0a55e6ae9f98b4ba2998185b7b5b6fad8
dir: /rc/bin/patch/undo/
#!/bin/rc
rfork e
if(! ~ $#* 1){
echo 'usage: patch/undo patch-name' >[1=2]
exit usage
}
if(! test -d /n/sources/patch){
rfork n
9fs sources
}
if(! test -d /n/sources/patch/$1){
echo 'no such patch' /n/sources/patch/$1 >[1=2]
exit nopatch
}
d=$1
builtin cd /n/sources/patch/$1 || exit nopatch
if(! patch/okay .){
echo 'bad patch: '$status >[1=2]
exit badpatch
}
fn xxx {
if(cmp $2.new $1){
echo cp /n/sources/patch/$d/$2.backup $1
cp $2.backup $1
}
if not
echo $1 has changed since patch was applied! >[2=1]
}
cat files | sed 's/^/xxx /' |rc