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add --seed option

--- a/README.md

+++ b/README.md

@@ -89,6 +89,8 @@

                            Default: 57x25

     --bpm <number>         Set the tempo (beats per minute).

                            Default: 120

+    --seed <number>        Set the seed for the random function.

+                           Default: 1

     -h or --help           Print this message and exit.

 OSC/MIDI options:

--- a/tui_main.c

+++ b/tui_main.c

@@ -38,6 +38,8 @@

 "                           Default: 57x25\n"

 "    --bpm <number>         Set the tempo (beats per minute).\n"

 "                           Default: 120\n"

+"    --seed <number>        Set the seed for the random function.\n"

+"                           Default: 1\n"

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

 "\n"

 "OSC/MIDI options:\n"

@@ -771,7 +773,7 @@

   Usz random_seed;

 } Ged;

-void ged_init(Ged* a, Usz undo_limit, Usz init_bpm) {

+void ged_init(Ged* a, Usz undo_limit, Usz init_bpm, Usz init_seed) {

   field_init(&a->field);

   field_init(&a->scratch_field);

   field_init(&a->clipboard_field);

@@ -808,7 +810,7 @@

   a->is_mouse_down = false;

   a->is_mouse_dragging = false;

   a->is_hud_visible = false;

-  a->random_seed = 1;

+  a->random_seed = init_seed;

 }

 void ged_deinit(Ged* a) {

@@ -1846,6 +1848,7 @@

   Argopt_osc_midi_bidule,

   Argopt_strict_timing,

   Argopt_bpm,

+  Argopt_seed,

 #ifdef FEAT_PORTMIDI

   Argopt_portmidi_list_devices,

   Argopt_portmidi_output_device,

@@ -1863,6 +1866,7 @@

       {"osc-midi-bidule", required_argument, 0, Argopt_osc_midi_bidule},

       {"strict-timing", no_argument, 0, Argopt_strict_timing},

       {"bpm", required_argument, 0, Argopt_bpm},

+      {"seed", required_argument, 0, Argopt_seed},

 #ifdef FEAT_PORTMIDI

       {"portmidi-list-devices", no_argument, 0, Argopt_portmidi_list_devices},

       {"portmidi-output-device", required_argument, 0,

@@ -1876,6 +1880,7 @@

   char const* osc_port = NULL;

   bool strict_timing = false;

   int init_bpm = 120;

+  long init_seed = 1;

   int init_grid_dim_y = 25;

   int init_grid_dim_x = 57;

   Midi_mode midi_mode;

@@ -1924,6 +1929,16 @@

         exit(1);

       }

     } break;

+    case Argopt_seed: {

+      init_seed = atol(optarg);

+      if (init_bpm < 1) {

+        fprintf(stderr,

+                "Bad seed argument %s.\n"

+                "Must be positive integer.\n",

+                optarg);

+        exit(1);

+      }

+    } break;

     case Argopt_init_grid_size: {

       enum {

         Max_dim_arg_val_y = ORCA_Y_MAX,

@@ -2008,7 +2023,7 @@

   qnav_init();

   Ged ged_state;

-  ged_init(&ged_state, (Usz)undo_history_limit, (Usz)init_bpm);

+  ged_init(&ged_state, (Usz)undo_history_limit, (Usz)init_bpm, (Usz)init_seed);

   if (osc_hostname != NULL && osc_port == NULL) {

     fprintf(stderr,