@Override
@Nonnull
public TypedYielder getSource(String args, Map<String, TypedYielder> context) {
Yielder<JsonEvent> yielder =
getYielderTypesafe(JsonEvent.class, ConfigReader.LAST_SOURCE, context);
String[] dirAndCommand = args.split(" ", 2);
if (dirAndCommand.length < 2) {
throw new IllegalArgumentException("Working directory and command template expected.");
}
ArrayList<String> commandTemplate = new ArrayList<>();
for (String commandFragment : dirAndCommand[1].split(" ")) {
commandTemplate.add(commandFragment);
}
ShellQueue shellQueue = new ShellQueue(Paths.get(dirAndCommand[0]), commandTemplate);
yielder.bind(shellQueue);
return wrapResultingYielder(shellQueue);
}