args.c

   1 #include <errno.h>
   2 #include "args.h"
   3 #include "config.h"
   4
   5 // Gameplay Variations
   6 float opt_bounciness;
   7 float opt_gamespeed;
   8 float opt_max_lead;
   9
  10 // Look and Feel
  11 int opt_fullscreen;
  12 int opt_music;
  13 int opt_sound;
  14
  15 error_t parse_opt(int, char*, struct argp_state *);
  16
  17 const char *argp_program_version = "Variations on Rockdodger " VERSION;
  18 const char *argp_program_bug_address = "<josh@qualdan.com>";
  19 static char doc[] = "Dodge the rocks until you die.";
  20 static struct argp_option opts[] = {
  21         {0, 0, 0, 0, "Gameplay Variations:"},
  22         {"bounciness", 'b', "N%", 0, "Keep N% of speed when hitting edges (default 50%)"},
  23         {"game-speed", 'g', "N%", 0, "50-100% (default 100%)"},
  24         {"max-lead", 'l', "#SCREENS", OPTION_HIDDEN,
  25                 "Max distance ahead you can get\n (default 1 screen; < 0 means no limit)"},
  26         {0, 0, 0, 0, "Look and Feel:"},
  27         {"full-screen", 'f', 0, 0, ""},
  28         {"music", 'm', 0, 0, "Enable music"},
  29         {"silent", 's', 0, 0, "No explosion sounds or music"},
  30         {0, 0, 0, 0, "Informational:", -1},
  31         {0}
  32 };
  33
  34 struct argp argp = { opts, &parse_opt, 0, doc };
  35
  36 void
  37 init_opts(void)
  38 {
  39         // Gameplay Variations
  40         opt_bounciness = 0.50; // lose 50% when you hit the screen edge.
  41         opt_gamespeed = 1.00; // Run game at full speed.
  42         opt_max_lead = 1.00*XSIZE;  // you can get 1 screen ahead.
  43
  44         // Look and Feel
  45         opt_fullscreen = 0;
  46         opt_sound = 1;
  47         opt_music = 0;
  48 }
  49
  50 error_t
  51 parse_opt(int key, char *arg, struct argp_state *state)
  52 {
  53         int i;
  54
  55         switch(key) {
  56                 case 'b': if(!sscanf(arg, "%d%%", &i)) {
  57                                           fprintf(stderr, "bad --bounciness (-b) value (should be 0-100%%)\n");
  58                                           argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
  59                                           return EINVAL;
  60                                   }
  61                                   if(i < 50) i = 50; else if(i > 100) i = 100;
  62                                   opt_bounciness = (float)i / 100;
  63                                   break;
  64                 case 'f': opt_fullscreen = 1; break;
  65                 case 'g': if(!sscanf(arg, "%d%%", &i)) {
  66                                           fprintf(stderr, "bad --gamespeed (-g) value (should be 50-100%%)\n");
  67                                           argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
  68                                           return EINVAL;
  69                                   }
  70                                   if(i < 0) i = 0; else if(i > 200) i = 100;
  71                                   opt_gamespeed = (float)i / 100;
  72                                   break;
  73                 case 'l': if(!sscanf(arg, "%f", &opt_max_lead)) {
  74                                           fprintf(stderr, "bad --max-lead (-l) value (must be a number)\n");
  75                                           argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
  76                                           return EINVAL;
  77                                   }
  78                                   opt_max_lead *= XSIZE;
  79                                   break;
  80                 case 'm': opt_music = 1; break;
  81                 case 's': opt_sound = 0; opt_music = 0; break;
  82                 default: return ARGP_ERR_UNKNOWN;
  83         }
  84         return 0;
  85 }