renderbug/lib/Figments/Command.h

#pragma once
#include <Arduino.h>

class Args {
    private:
      String *str;
    public:
      Args(String *str) : str(str) {}
      operator const char*() const {
        return str->c_str();
      }
      String operator[](int pos) {
        char buf[64];
        strncpy(buf, str->c_str(), sizeof(buf));
        char *args = strtok(buf, " ");
        while (pos > 0 && args != NULL) {
          args = strtok(NULL, " ");
          pos--;
        }
        if (args == NULL) {
          return String();
        }
        return String(args);
      }
};

struct Task;

struct Command {
  using Executor = void(Task::*)(Args&, Print&);

  template<typename T>
  using MemberExecutor = void(T::*)(Args&, Print&);

  const char* name = NULL;
  Executor func = NULL;

  void invoke(Task* task, Args& args, Print& printer) const {
    if (func) {
      (*task.*func)(args, printer);
    }
  }

  Command(const char* name, Executor func) : name(name), func(func) {}

  template<class T>
  Command(const char* name, MemberExecutor<T> func) : name(name), func(static_cast<Executor>(func)) {}
};