Add preliminary support for options

opts/opts.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef struct options_s {
+  const char *name;
+  void *ptr;
+  union {
+    unsigned *value;
+    unsigned *value_uint;
+    bool *value_bool;
+  };
+  const char *format;
+  const char *help;
+  unsigned size;
+} option_t;
+
+#define lambda(return_type, function_body) \
+({ \
+      return_type __fn__ function_body \
+          __fn__; \
+})
+
+#define OPTION_FORMAT_uint "%d"
+#define OPTION_FORMAT_bool "%d"
+
+#define DEFINE_OPTION(_section, _name, _type) \
+  { \
+    .name = #_section "-" #_name, \
+    .value_##_type = &_section##_options._name, \
+    .format = OPTION_FORMAT_##_type, \
+    .size = sizeof(_section##_options._name), \
+  }
+
+#define DEFINE_OPTION_PTR(_section, _name, _format) \
+  { \
+    .name = #_section "-" #_name, \
+    .ptr = _section##_options._name, \
+    .format = _format, \
+    .size = sizeof(_section##_options._name), \
+  }
+
+int parse_opts(option_t *options, int argc, char *argv[]);