#include <gpgme.h>
#include <gpg-error.h>

int main(int argc, char **argv)
{
  if (argc != 2)
  {
    fprintf(stderr, "Usage: %s <key>\n", argv[0]);
    return 1;
  }

  const char *address = argv[1];

  gpgme_check_version(NULL);

  gpgme_error_t err;
  gpgme_ctx_t ctx = NULL;
  gpgme_key_t key = NULL;

  err = gpgme_new(&ctx);
  if (err != 0)
  {
    fprintf(stderr, "gpgme_new: %s\n", gpgme_strerror(err));
    return 1;
  }

  err = gpgme_op_keylist_start(ctx, address, 1);
  if (err != 0)
  {
    fprintf(stderr, "gpgme_op_keylist_start: %s\n", gpgme_strerror(err));
    return 1;
  }

  err = gpgme_op_keylist_next(ctx, &key);
  if (err != 0)
  {
    fprintf(stderr, "gpgme_op_keylist_next: secret key '%s' not found: %s\n",
            address, gpgme_strerror(err));
    return 1;
  }

  printf("Got key with fingerprint %s\n", key->fpr);
}