nu: Add --server argument to dns command

tree/.local/nu/mullvad.nu

@@ -47,9 +47,15 @@ def "m daemon is-running" [
 }
 
 def dns [
+    --server (-s): string,
     name: string,
 ] {
-    nslookup $name |
+    # HACK: turn the optional argument into a list. not sure how to pass it to nslookup otherwise.
+    let server = ([$server] | compact)
+
+    nslookup $name ...$server |
+      lines |
+      skip until { |line| $line =~ answer } |
       parse -r "Address:\\s(?<ipv4>\\d+\\.\\d+\\.\\d+\\.\\d+)|Address:\\s(?<ipv6>[\\d:a-z]+)" |
       each { |row|
         if $row.ipv4 != "" {