src/nvim/event/defs.h


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#ifndef NVIM_EVENT_DEFS_H
#define NVIM_EVENT_DEFS_H

#include <assert.h>
#include <stdarg.h>

#define EVENT_HANDLER_MAX_ARGC 4

typedef void (*argv_callback)(void **argv);
typedef struct message {
  int priority;
  argv_callback handler;
  void *argv[EVENT_HANDLER_MAX_ARGC];
} Event;

#define VA_EVENT_INIT(event, p, h, a)                   \
  do {                                                  \
    assert(a <= EVENT_HANDLER_MAX_ARGC);                \
    (event)->priority = p;                              \
    (event)->handler = h;                               \
    if (a) {                                            \
      va_list args;                                     \
      va_start(args, a);                                \
      for (int i = 0; i < a; i++) {                     \
        (event)->argv[i] = va_arg(args, void *);        \
      }                                                 \
      va_end(args);                                     \
    }                                                   \
  } while (0)

static inline Event event_create(int priority, argv_callback cb, int argc, ...)
{
  assert(argc <= EVENT_HANDLER_MAX_ARGC);
  Event event;
  VA_EVENT_INIT(&event, priority, cb, argc);
  return event;
}

#endif  // NVIM_EVENT_DEFS_H