+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <optcfg.h>
+#include "opt.h"
+
+Options opt;
+
+enum {
+ OPT_VR,
+ OPT_SRGB,
+ OPT_FULLSCREEN,
+ OPT_WINDOWED,
+ OPT_HELP
+};
+
+static optcfg_option options[] = {
+ // short, long, id, desc
+ {0, "vr", OPT_VR, "enable VR mode"},
+ {0, "srgb", OPT_SRGB, "use linear color space"},
+ {'f', "fullscreen", OPT_FULLSCREEN, "run in fullscreen mode"},
+ {'w', "windowed", OPT_WINDOWED, "run in windowed mode"},
+ {'h', "help", OPT_HELP, "print usage and exit"},
+ OPTCFG_OPTIONS_END
+};
+
+static int opt_handler(optcfg *oc, int opt, void *cls);
+
+bool init_options(int argc, char **argv, const char *cfgfile)
+{
+ // default options
+ memset(&opt, 0, sizeof opt);
+ opt.srgb = true;
+
+ optcfg *oc = optcfg_init(options);
+ optcfg_set_opt_callback(oc, opt_handler, 0);
+
+ if(cfgfile && optcfg_parse_config_file(oc, cfgfile) == -1) {
+ optcfg_destroy(oc);
+ return false;
+ }
+
+ if(argv && optcfg_parse_args(oc, argc, argv) == -1) {
+ fprintf(stderr, "invalid option\n");
+ optcfg_destroy(oc);
+ return false;
+ }
+
+ optcfg_destroy(oc);
+ return true;
+}
+
+static bool is_enabled(optcfg *oc)
+{
+ int res;
+ optcfg_enabled_value(oc, &res);
+ return res != 0;
+}
+
+static int opt_handler(optcfg *oc, int optid, void *cls)
+{
+ switch(optid) {
+ case OPT_VR:
+ opt.vr = is_enabled(oc);
+ break;
+
+ case OPT_SRGB:
+ opt.srgb = is_enabled(oc);
+ break;
+
+ case OPT_FULLSCREEN:
+ opt.fullscreen = is_enabled(oc);
+ break;
+
+ case OPT_WINDOWED:
+ opt.fullscreen = !is_enabled(oc);
+ break;
+
+ case OPT_HELP:
+ printf("Usage: vrfileman [options]\nOptions:\n");
+ optcfg_print_options(oc);
+ exit(0);
+ }
+ return true;
+}