polybar/include/modules/meta/base.hpp

#pragma once

#include <algorithm>
#include <chrono>
#include <condition_variable>
#include <mutex>

#include "common.hpp"
#include "components/config.hpp"
#include "components/logger.hpp"
#include "components/types.hpp"
#include "errors.hpp"
#include "utils/concurrency.hpp"
#include "utils/functional.hpp"
#include "utils/inotify.hpp"
#include "utils/string.hpp"

POLYBAR_NS

namespace chrono = std::chrono;
using namespace std::chrono_literals;

#define DEFAULT_FORMAT "format"

#define DEFINE_MODULE(name, type) struct name : public type<name>
#define CONST_MOD(name) static_cast<name const&>(*this)
#define CAST_MOD(name) static_cast<name*>(this)

// fwd decl {{{

namespace drawtypes {
  class label;
  using label_t = shared_ptr<label>;
  class ramp;
  using ramp_t = shared_ptr<ramp>;
  class progressbar;
  using progressbar_t = shared_ptr<progressbar>;
  class animation;
  using animation_t = shared_ptr<animation>;
  using icon = label;
  using icon_t = label_t;
  class iconset;
  using iconset_t = shared_ptr<iconset>;
}

class builder;

// }}}

namespace modules {
  using namespace drawtypes;

  DEFINE_ERROR(module_error);
  DEFINE_CHILD_ERROR(undefined_format, module_error);
  DEFINE_CHILD_ERROR(undefined_format_tag, module_error);

  // class definition : module_format {{{

  struct module_format {
    string value;
    vector<string> tags;
    string fg;
    string bg;
    string ul;
    string ol;
    int spacing;
    int padding;
    int margin;
    int offset;

    string decorate(builder* builder, string output);
  };

  // }}}
  // class definition : module_formatter {{{

  class module_formatter {
   public:
    explicit module_formatter(const config& conf, string modname) : m_conf(conf), m_modname(modname) {}

    void add(string name, string fallback, vector<string>&& tags, vector<string>&& whitelist = {});
    bool has(const string& tag, const string& format_name);
    bool has(const string& tag);
    shared_ptr<module_format> get(const string& format_name);

   protected:
    const config& m_conf;
    string m_modname;
    map<string, shared_ptr<module_format>> m_formats;
  };

  // }}}

  // class definition : module_interface {{{

  struct module_interface {
   public:
    virtual ~module_interface() {}

    virtual string name() const = 0;
    virtual bool running() const = 0;

    virtual void setup() = 0;
    virtual void start() = 0;
    virtual void stop() = 0;
    virtual void halt(string error_message) = 0;
    virtual string contents() = 0;

    virtual bool handle_event(string cmd) = 0;
    virtual bool receive_events() const = 0;

    virtual void set_update_cb(callback<>&& cb) = 0;
    virtual void set_stop_cb(callback<>&& cb) = 0;
  };

  // }}}
  // class definition : module {{{

  template <class Impl>
  class module : public module_interface {
   public:
    module(const bar_settings bar, const logger& logger, const config& config, string name);
    ~module() noexcept;

    void set_update_cb(callback<>&& cb);
    void set_stop_cb(callback<>&& cb);

    string name() const;
    bool running() const;
    void setup();
    void stop();
    void halt(string error_message);
    void teardown();
    string contents();
    bool handle_event(string cmd);
    bool receive_events() const;

   protected:
    void broadcast();
    void idle();
    void sleep(chrono::duration<double> sleep_duration);
    void wakeup();
    string get_format() const;
    string get_output();

   protected:
    callback<> m_update_callback;
    callback<> m_stop_callback;

    concurrency_util::spin_lock m_lock;

    const bar_settings m_bar;
    const logger& m_log;
    const config& m_conf;

    std::mutex m_sleeplock;
    std::condition_variable m_sleephandler;

    string m_name;
    unique_ptr<builder> m_builder;
    unique_ptr<module_formatter> m_formatter;
    vector<thread> m_threads;
    thread m_mainthread;

   private:
    stateflag m_enabled{true};
    string m_cache;
  };

  // }}}
}

POLYBAR_NS_END