fixes

code/__DEFINES/_flags/_flags.dm

@@ -163,5 +163,19 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 	else if(!HAS_TRAIT(x, TRAIT_KEEP_TOGETHER))\
 	 	x.appearance_flags &= ~KEEP_TOGETHER
 
+//dir macros
+///Returns true if the dir is diagonal, false otherwise
+#define ISDIAGONALDIR(d) (d&(d-1))
+///True if the dir is north or south, false therwise
+#define NSCOMPONENT(d)   (d&(NORTH|SOUTH))
+///True if the dir is east/west, false otherwise
+#define EWCOMPONENT(d)   (d&(EAST|WEST))
+///Flips the dir for north/south directions
+#define NSDIRFLIP(d)     (d^(NORTH|SOUTH))
+///Flips the dir for east/west directions
+#define EWDIRFLIP(d)     (d^(EAST|WEST))
+///Turns the dir by 180 degrees
+#define DIRFLIP(d)       turn(d, 180)
+
 /// 33554431 (2^24 - 1) is the maximum value our bitflags can reach.
 #define MAX_BITFLAG_DIGITS 8