Use $LISTER.

@@ -16,7 +16,6 @@
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #include "mail.h"
-#include <dirent.h>
 
 /*
  * folders
@@ -25,8 +24,6 @@
 int
 mail_folders (int argc, char **argv)
 {
-  DIR *dir;
-  struct dirent *dirent;
   char *path;
   struct mail_env_entry *env = util_find_env ("folder");
 
@@ -37,24 +34,7 @@ mail_folders (int argc, char **argv)
     }
 
   path = util_fullpath(env->value);
-  dir = opendir(path);
-  if (!dir)
-    {
-      fprintf(ofile, "can't open directory `%s'\n", path);
-      free(path);
-      return 1;
-    }
-  
-
-  while (dirent = readdir(dir))
-    {
-      if (dirent->d_name[0] == '.')
-	continue;
-      fprintf(ofile, "%s\n", dirent->d_name);
-    }
-  
-  closedir(dir);
-
+  util_do_command("! %s %s", getenv("LISTER"), path);
   free(path);
   
   return 0;