init: initial commit

include/screen.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdlib>
+#include <cstdio>
+
+#include <unistd.h>
+#include <termios.h>
+
+struct Screen {
+    char *buf;
+    std::size_t w, h;
+
+    float dx = 0, dy = 0;
+    float sx = 1, sy = 1;
+
+    void draw();
+    void clear();
+
+    char &at(std::size_t n);
+    char &at(std::size_t x, std::size_t y);
+
+    void resize(std::size_t n);
+    void resize(std::size_t x, std::size_t y);
+
+    Screen(std::size_t n) : buf(nullptr) { resize(n); }
+    Screen(std::size_t x, std::size_t y) : buf(nullptr) { resize(x, y); }
+    ~Screen() { delete[] buf; }
+
+private:
+    char _dummy;
+
+    static inline void gotoxy(int x, int y)
+    {
+	std::printf("\033[%d;%dH", y, x);
+    }
+};
+
+static termios old, current;
+static inline void enter_noncanonical_mode(void)
+{
+    tcgetattr(STDIN_FILENO, &old);
+    current = old;
+    current.c_lflag &= ~ICANON; /* disable buffered i/o */
+    current.c_lflag &= ~ECHO; /* set no echo mode */
+    current.c_cc[VMIN] = 0;/* no wait */
+    current.c_cc[VTIME] = 0;/* no wait */
+
+    tcsetattr(STDIN_FILENO, TCSANOW, &current);
+}
+static inline void enter_canonical_mode(void){ tcsetattr(0, TCSANOW, &old); }