Major update

- Add an IO system to hijack a bit of the terminal.
- Other minor fixes.

include/internal/io/io.h

@@ -0,0 +1,81 @@
+#pragma once
+
+#include "definitions.h"
+#include "pch.h"
+
+namespace bed::internal::io {
+struct KeyEvent {
+  enum struct KeyType {
+    NONE,
+    CHAR,
+    SPECIAL,
+    MOUSE,
+    PASTE
+  };
+  enum struct SpecialKey {
+    UP,
+    DOWN,
+    LEFT,
+    RIGHT,
+    DELETE,
+    UNKNOWN
+  };
+  enum struct Modifier {
+    NONE,
+    SHIFT,
+    ALT,
+    CTRL,
+    CTRL_ALT
+  };
+  enum struct MouseState {
+    PRESS,
+    RELEASE
+  };
+
+  KeyType type = KeyType::NONE;
+  std::string text;
+
+  SpecialKey special_key = SpecialKey::UNKNOWN;
+  Modifier modifier = Modifier::NONE;
+
+  MouseState mouse_state = MouseState::PRESS;
+  uint16_t mouse_x = 0;
+  uint16_t mouse_y = 0;
+};
+
+struct IO {
+  IO();
+  ~IO();
+
+  IO(const IO &) = delete;
+  IO &operator=(const IO &) = delete;
+
+  void enable_mouse();
+  void disable_mouse();
+
+  std::pair<uint16_t, uint16_t> terminal_size();
+  std::pair<uint16_t, uint16_t> cursor_position();
+  void move_cursor(uint16_t row, uint16_t col);
+
+  std::pair<std::string, bool> get_command(BEd &);
+
+  KeyEvent read_key();
+
+private:
+  static termios orig_termios;
+  static bool cleaned;
+  static void cleanup();
+
+  std::deque<char> input_queue;
+
+  bool get_next_byte(char &out);
+  void enqueue_bytes(const std::string &bytes);
+  static int utf8_seq_len(uint8_t byte);
+
+  std::string read_next_unit();
+  bool read_bracketed_paste(std::string &out);
+
+  KeyEvent parse_mouse(const std::string &buf);
+  KeyEvent parse_escape(const std::string &buf);
+};
+} // namespace bed::internal::io