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plan9: highlight sends

--- a/plan9.c

+++ b/plan9.c

@@ -12,6 +12,8 @@

 #define MIN(x,y) ((x)<(y)?(x):(y))

 #define MAX(x,y) ((x)>(y)?(x):(y))

+#define is_movement(c) (c == 'W' || c == 'N' || c == 'E' || c == 'S')

+#define is_send(c) (c == ':' || c == '%' || c == '!' || c == '?' || c == ';' || c == ';' || c == '$')

 enum {

 	Txtoff = 16,

@@ -396,7 +398,7 @@

 				if (c == '#') {

 					fg = Dfmed;

 				} else {

-					if (c >= 'A' && c <= 'Z' && c  != 'W' && c != 'N' && c != 'E' && c != 'S') {

+					if ((c >= 'A' && c <= 'Z' && !is_movement(c)) || is_send(c)) {

 						bg = Dbmed;

 						fg = Dfinv;

 					}