implement ANSI escape macros for VT

include/terminal.h

@@ -0,0 +1,40 @@
+#ifndef TERMINAL_H
+#define TERMINAL_H
+
+// VT_: Helper macros for printing colored text to terminals, using ANSI escape codes
+// VT stands for Virtual Terminal
+
+// 3-bit color codes
+#define VT_COLOR_BLACK      0
+#define VT_COLOR_RED        1
+#define VT_COLOR_GREEN      2
+#define VT_COLOR_YELLOW     3
+#define VT_COLOR_BLUE       4
+#define VT_COLOR_MAGENTA    5
+#define VT_COLOR_CYAN       6
+#define VT_COLOR_WHITE      7
+
+#define VT_COLOR_FOREGROUND 3
+#define VT_COLOR_BACKGROUND 4
+
+#define VT_COLOR_EXPAND0(type, color) #type #color
+#define VT_COLOR_EXPAND1(type, color) VT_COLOR_EXPAND0(type, color)
+#define VT_COLOR(type, color) VT_COLOR_EXPAND1(VT_COLOR_##type, VT_COLOR_##color)
+
+#define VT_ESC "\x1b"
+#define VT_CSI "["
+#define VT_CUP(x, y) VT_ESC VT_CSI y ";" x "H"
+#define VT_ED(n) VT_ESC VT_CSI #n "J"
+#define VT_SGR(n) VT_ESC VT_CSI n "m"
+
+// Add more macros if necessary
+#define VT_COL(back, fore) VT_SGR(VT_COLOR(BACKGROUND, back) ";" VT_COLOR(FOREGROUND, fore))
+#define VT_FGCOL(color) VT_SGR(VT_COLOR(FOREGROUND, color))
+#define VT_BGCOL(color) VT_SGR(VT_COLOR(BACKGROUND, color))
+#define VT_RST VT_SGR("")
+#define VT_CLS VT_ED(2)
+
+// ASCII BEL character, plays an alert tone
+#define BEL '\a'
+
+#endif