#include <assert.h>
#include <git2/repository.h>
#include <git2/errors.h>
#include <git2/revparse.h>
#include <git2/oid.h>
#include <git2/global.h>
#include <stdio.h>
#include <unistd.h>

int main() {
  git_repository *repo;
  assert(git_libgit2_init() == 1);
  assert(git_repository_open(&repo, "..") == 0);

  git_object *obj;
  assert(git_revparse_single(&obj, repo, "HEAD") == 0);
  git_buf buf = {0};
  int rc;
  rc = git_object_short_id(&buf, obj);
  if (rc == 0) {
    fprintf(stderr, "short: %s", buf.ptr);
  } else {
    git_error const *err;
    err = git_error_last();
    fprintf(stderr, "error: class=%i: %s", err->klass, err->message);
  }

  return 0;
}