From ede689d23e57c9b701ab19aa9112a0b2368865c9 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Mon, 28 Feb 2022 21:30:30 +0100
Subject: feat: add input handler & quitting with 'q'

---
 src/engine/user/input.cpp | 64 +++++++++++++++++++++++++++++++++++++++++++++++
 src/engine/user/input.hpp | 31 +++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 src/engine/user/input.cpp
 create mode 100644 src/engine/user/input.hpp

(limited to 'src/engine/user')

diff --git a/src/engine/user/input.cpp b/src/engine/user/input.cpp
new file mode 100644
index 0000000..e68f303
--- /dev/null
+++ b/src/engine/user/input.cpp
@@ -0,0 +1,64 @@
+#include "input.hpp"
+
+#include <unistd.h>
+
+void InputHandler::listen() const
+{
+	char character = 0;
+
+	while (read(STDIN_FILENO, &character, 1) == 1)
+	{
+		notify(character);
+	}
+}
+
+void InputHandler::attach(const char &event, Callback callback)
+{
+	if (_key_observers.count(event) == 0)
+	{
+		_key_observers[event] = std::vector<Callback>();
+	}
+
+	_key_observers[event].push_back(callback);
+}
+
+void InputHandler::notify(const char &event) const
+{
+	if (_key_observers.count(event) == 0)
+	{
+		return;
+	}
+
+	for (const auto &observer : _key_observers.at(event))
+	{
+		observer();
+	}
+}
+
+void InputHandler::enter_raw_mode()
+{
+	if (_original_termios == nullptr)
+	{
+		_original_termios = std::make_shared<termios>();
+	}
+
+	tcgetattr(STDIN_FILENO, _original_termios.get());
+
+	auto raw_termios = termios(*_original_termios);
+
+	raw_termios.c_lflag &= static_cast<unsigned int>(~(ECHO | ICANON | ISIG));
+
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw_termios);
+}
+
+void InputHandler::leave_raw_mode()
+{
+	if (_original_termios == nullptr)
+	{
+		return;
+	}
+
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, _original_termios.get());
+
+	_original_termios = nullptr;
+}
diff --git a/src/engine/user/input.hpp b/src/engine/user/input.hpp
new file mode 100644
index 0000000..f48ab86
--- /dev/null
+++ b/src/engine/user/input.hpp
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "DI/auto_wirable.hpp"
+#include "interfaces/input.hpp"
+#include "interfaces/observable.hpp"
+
+#include <memory>
+#include <termios.h>
+#include <unordered_map>
+#include <vector>
+
+class InputHandler : public IInputHandler, public AutoWirable<IInputHandler, InputHandler>
+{
+public:
+	InputHandler() = default;
+
+	void listen() const override;
+
+	void attach(const char &event, Callback callback) override;
+
+	void notify(const char &event) const override;
+
+	void enter_raw_mode() override;
+
+	void leave_raw_mode() override;
+
+private:
+	std::unordered_map<char, std::vector<Callback>> _key_observers;
+
+	std::shared_ptr<termios> _original_termios = nullptr;
+};
-- 
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