feat: add input handler & quitting with 'q'

1 files changed, 64 insertions, 0 deletions

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;
+}