Add some macros for color support

kern/ansi.h

@@ -3,6 +3,22 @@
 
 #include <inc/types.h>
 
+#define ACOL_WRAP(s) "\33[" s "m"
+#define ACOL_BLACK  ACOL_WRAP("30")
+#define ACOL_RED ACOL_WRAP("31")
+#define ACOL_GREEM ACOL_WRAP("32")
+#define ACOL_YELLOW ACOL_WRAP("33")
+#define ACOL_BLUE ACOL_WRAP("34")
+#define ACOL_MAGENTA ACOL_WRAP("35")
+#define ACOL_CYAN ACOL_WRAP("36")
+#define ACOL_WHITE ACOL_WRAP("37")
+#define ACOL_CLEAR ACOL_WRAP("0")
+
+#define ACOL_TAG(c, s) "[" c s ACOL_CLEAR "] "
+#define ACOL_NOTE(s) ACOL_TAG(ACOL_WHITE, "Note   ") s
+#define ACOL_WARN(s) ACOL_TAG(ACOL_YELLOW, "Warning") s
+#define ACOL_ERR(s) ACOL_TAG(ACOL_RED, "Error  ") s
+
 struct AttrState {
 	uint8_t cattrs;
 	uint8_t attrs;