elvish_config/aliases/adguard.elv

edit:add-var adguard~ {|@argv|
  use str
  doas chattr -i /etc/resolv.conf
  var beg = 's|^.*\(192\.168\.0\.25\)|'
  var end = 'nameserver \1|'
  if (and (> (count $argv) 0) (str:has-prefix $argv[0] u)) {
    set end = '# '$end
  }
  doas sed -i $beg$end /etc/resolv.conf
  doas chattr +i /etc/resolv.conf
}