Add the --no-color (and --no-colour) command-line options

src/globals.c

@@ -72,3 +72,5 @@ int	game_num    = 0;		// Game number (1-9)
 
 bool	quit_selected;			// Is a player trying to quit the game?
 bool	abort_game;			// Abort game without declaring winner?
+
+bool	option_no_color = false;	// True if --no-color was specified

src/globals.h

@@ -150,5 +150,7 @@ extern int	game_num;		// Game number (1-9)
 extern bool	quit_selected;		// Is a player trying to quit the game?
 extern bool	abort_game;		// Abort game without declaring winner?
 
+extern bool	option_no_color;	// True if --no-color was specified
+
 
 #endif /* included_GLOBALS_H */

src/intf.c

@@ -29,8 +29,7 @@
 
 
 #include "system.h"
-#include "intf.h"
+#include "trader.h"
-#include "utils.h"
 
 
 /************************************************************************
@@ -88,7 +87,7 @@ void init_screen (void)
 		 MIN_COLS, MIN_LINES);
     }
 
-    use_color = has_colors();
+    use_color = ! option_no_color && has_colors();
 
     curwin = stdscr;
     topwin = NULL;

src/trader.c

@@ -68,7 +68,6 @@ int main (int argc, char *argv[])
     init_program();
 
     // Play the actual game
-
     init_game();
     while (! quit_selected && ! abort_game && turn_number <= max_turn) {
 	select_moves();
@@ -91,6 +90,10 @@ int main (int argc, char *argv[])
 
 /* Constants for command line options */
 
+enum options_char {
+    OPTION_NO_COLOR = 1,
+};
+
 static const char options_short[] = "hV";
     /* -h   --help
        -V   --version
@@ -99,6 +102,8 @@ static const char options_short[] = "hV";
 static struct option const options_long[] = {
     { "help",      no_argument, NULL, 'h' },
     { "version",   no_argument, NULL, 'V' },
+    { "no-color",  no_argument, NULL, OPTION_NO_COLOR },
+    { "no-colour", no_argument, NULL, OPTION_NO_COLOR },
     { NULL,        0,           NULL, 0 }
 };
 
@@ -126,12 +131,19 @@ void process_cmdline (int argc, char *argv[])
 
 	switch (c) {
 	case 'h':
-	    /* -h, --help: show help */
+	    // -h, --help: show help
 	    show_usage(EXIT_SUCCESS);
+	    break;
 
 	case 'V':
-	    /* -V, --version: show version information */
+	    // -V, --version: show version information
 	    show_version();
+	    break;
+
+	case OPTION_NO_COLOR:
+	    // --no-color, --no-colour: don't use colour
+	    option_no_color = true;
+	    break;
 
 	default:
 	    show_usage(EXIT_FAILURE);
@@ -220,7 +232,8 @@ Play Star Traders, a simple game of interstellar trading.\n\n\
 	printf("\
 Options:\n\
   -V, --version    output version information and exit\n\
-  -h, --help      display this help and exit\n\n\
+  -h, --help       display this help and exit\n\
+      --no-color   don't use colour for displaying text\n\n\
 ");
 	printf("\
 If GAME is specified as a number between 1 and 9, load and continue\n\