Add doas completion (2) (missing file in previous commit)

completion/doas.elv

@@ -0,0 +1,10 @@
+fn complete {|@argv|
+  if (and (> (count $argv) 2) (has-key $edit:completion:arg-completer $argv[1])) {
+    $edit:completion:arg-completer[$argv[1]] (all $argv[1:])
+  } else {
+    edit:complete-sudo $@argv
+  }
+}
+
+set edit:completion:arg-completer[doas] = $edit:complete-sudo~
+#edit:completion:arg-completer[doas] = $-complete~