#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int readplugins(char **plugins) {
  struct dirent *de;

  DIR *dr = opendir("/usr/share/thing/plugins/");

  if (dr == NULL) {
    perror("Could not open plugin capability directory "
           "(/usr/share/thing/plugins/)");
    return 1;
  }

  int i = 0; // plugin counter
  while ((de = readdir(dr)) != NULL) {
    // find actual name end, as d_name is fixed length 256 bytes
    char *nend = strchr(de->d_name, '\0');
    if (nend - de->d_name < 7)
      continue;

    // only match toml files
    char ext[6];
    strncpy(ext, nend - 5, 6);
    if ((strcmp(ext, ".toml")))
      continue;

    // retrieve only plugin name from filename
    // add it to plugins[]
    int nlen = nend - de->d_name - 5;
    plugins[i] = malloc(nlen);
    strncpy(plugins[i], de->d_name, nlen);
    i++;
  }
  closedir(dr);

  // add end signal
  if (i < 256)
    plugins[i] = "";

  return 0;
}