From b74611d2b20fc071b8a699f2ce25e61f60118d6e Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 22 May 2022 23:13:29 +0200
Subject: refactor: improve input handling & remove commands

---
 src/engine/graphics/scene.cpp | 34 +++++++++++++++++++++++++++++-----
 src/engine/graphics/scene.hpp |  6 ++++--
 2 files changed, 33 insertions(+), 7 deletions(-)

(limited to 'src/engine/graphics')

diff --git a/src/engine/graphics/scene.cpp b/src/engine/graphics/scene.cpp
index 52613d8..b0d77b8 100644
--- a/src/engine/graphics/scene.cpp
+++ b/src/engine/graphics/scene.cpp
@@ -13,36 +13,60 @@
 Scene::Scene(
 	IMatrixFactory<std::string_view> matrix_factory,
 	std::shared_ptr<ICursorController> cursor_controller) noexcept
-	: _is_shown(false),
-	  _matrix(matrix_factory(size() - Bounds({.width = 0U, .height = 1U}))),
-	  _cursor_controller(std::move(cursor_controller))
+	: _matrix(matrix_factory(size() - Bounds({.width = 0U, .height = 1U}))),
+	  _cursor_controller(std::move(cursor_controller)),
+	  _is_shown(false)
 {
 	_matrix->fill(" ");
 }
 
 void Scene::enter() noexcept
 {
-	if (_is_shown)
+	if (_is_shown || _original_termios != nullptr)
 	{
 		return;
 	}
 
+	// Enable alternative buffer
 	fmt::print(ENABLE_ALT_BUFFER, fmt::arg("esc", ESC));
 	std::cout.flush();
 
+	// Create a backup of the current terminal state
+	_original_termios = std::make_shared<termios>();
+	tcgetattr(STDIN_FILENO, _original_termios.get());
+
+	auto new_termios = termios(*_original_termios);
+
+	// Set the local mode flags of the new termios structure
+	//
+	// The following flags are disabled:
+	// ECHO   - Echoing input characters
+	// ICANON - Canonical mode (line by line input)
+	// ISIG   - Generate the corresponding signals for the characters
+	//			INTR, QUIT, SUSP and DSUSP
+	new_termios.c_lflag &= static_cast<uint32_t>(~(ECHO | ICANON | ISIG));
+
+	// Set a new terminal state
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, &new_termios);
+
 	_is_shown = true;
 }
 
 void Scene::leave() noexcept
 {
-	if (!_is_shown)
+	if (!_is_shown || _original_termios == nullptr)
 	{
 		return;
 	}
 
+	// Disable alternative buffer
 	fmt::print(DISABLE_ALT_BUFFER, fmt::arg("esc", ESC));
 	std::cout.flush();
 
+	// Restore the original terminal state
+	tcsetattr(STDIN_FILENO, TCSAFLUSH, _original_termios.get());
+
+	_original_termios = nullptr;
 	_is_shown = false;
 }
 
diff --git a/src/engine/graphics/scene.hpp b/src/engine/graphics/scene.hpp
index 268f8dc..e57e1f8 100644
--- a/src/engine/graphics/scene.hpp
+++ b/src/engine/graphics/scene.hpp
@@ -8,6 +8,7 @@
 
 #include <memory>
 #include <string_view>
+#include <termios.h>
 
 constexpr fmt::string_view ENABLE_ALT_BUFFER = "{esc}[?1049h";
 constexpr fmt::string_view DISABLE_ALT_BUFFER = "{esc}[?1049l";
@@ -29,8 +30,9 @@ public:
 		-> const std::shared_ptr<IMatrix<std::string_view>> & override;
 
 private:
-	bool _is_shown;
-
 	std::shared_ptr<IMatrix<std::string_view>> _matrix;
 	std::shared_ptr<ICursorController> _cursor_controller;
+
+	bool _is_shown;
+	std::shared_ptr<termios> _original_termios = nullptr;
 };
-- 
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