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Add --quiet option to cli

--- a/cli_main.c

+++ b/cli_main.c

@@ -13,6 +13,7 @@

       "    -t <number>   Number of timesteps to simulate.\n"

       "                  Must be 0 or a positive integer.\n"

       "                  Default: 1\n"

+      "    -q or --quiet Don't print the result to stdout.\n"

       "    -h or --help  Print this message and exit.\n"

       );

   // clang-format on

@@ -20,13 +21,15 @@

 int main(int argc, char **argv) {

   static struct option cli_options[] = {{"help", no_argument, 0, 'h'},

+                                        {"quiet", no_argument, 0, 'q'},

                                         {NULL, 0, NULL, 0}};

   char *input_file = NULL;

   int ticks = 1;

+  bool print_output = true;

   for (;;) {

-    int c = getopt_long(argc, argv, "t:h", cli_options, NULL);

+    int c = getopt_long(argc, argv, "t:qh", cli_options, NULL);

     if (c == -1)

       break;

     switch (c) {

@@ -40,6 +43,9 @@

         return 1;

       }

       break;

+    case 'q':

+      print_output = false;

+      break;

     case 'h':

       usage();

       return 0;

@@ -110,7 +116,8 @@

   }

   mbuf_reusable_deinit(&mbuf_r);

   oevent_list_deinit(&oevent_list);

-  field_fput(&field, stdout);

+  if (print_output)

+    field_fput(&field, stdout);

   field_deinit(&field);

   return 0;

 }