Mark today in bold iff "remind -c" color output is enabled.

docs/WHATSNEW

@@ -20,6 +20,9 @@ CHANGES TO REMIND
   remind and rem2ps executables.  Use "make install-stripped" if you want
   them stripped.
 
+- CHANGE: remind: "remind -c" highlights today's date in bold, if
+  colors are enabled.
+
 - DOCUMENTATION FIX: Document behavior of DO and filedir() with respect
   to symbolic links.
 

src/calendar.c

@@ -919,11 +919,11 @@ static void DoCalendarOneWeek(int nleft)
             }
         }
 	if (OrigJul+i == RealToday) {
-            if (isatty(STDOUT_FILENO)) {
+            if (UseVTColors) {
                 printf("\x1B[1m"); /* Bold */
             }
 	    PrintLeft(buf, ColSpaces-1, '*');
-            if (isatty(STDOUT_FILENO)) {
+            if (UseVTColors) {
                 printf("\x1B[0m"); /* Normal */
             }
             putchar(' ');
@@ -1141,11 +1141,11 @@ static int WriteCalendarRow(void)
                 }
             }
 	    if (Julian(y, m, d+i-wd) == RealToday) {
-                if (isatty(STDOUT_FILENO)) {
+                if (UseVTColors) {
                     printf("\x1B[1m"); /* Bold */
                 }
 		PrintLeft(buf, ColSpaces-1, '*');
-                if (isatty(STDOUT_FILENO)) {
+                if (UseVTColors) {
                     printf("\x1B[0m"); /* Normal */
                 }
 		putchar(' ');