diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..05fcfac
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,322 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor Boston, MA 02110-1301,  USA
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <ftw.h>
+#include <getopt.h>
+
+#include <magic.h>
+#include <simdb.h>
+
+#include "filelist.h"
+#include "group.h"
+
+/* opts */
+enum msglevel { normal = 0, verbose, debug } msglevel = normal;
+const char *root = NULL;
+
+/* vars */
+magic_t mcookie;
+filelist_t *flist;
+
+/* funcs */
+static void
+usage(int exitcode) {
+  fprintf(stderr,
+    "Usage: simdb-fdupes [path]\n"
+    "  -h         This help\n"
+    "  -v         Verbose messages\n"
+  );
+  exit(exitcode);
+}
+
+static void
+log_msg(enum msglevel l, const char *fmt, ...) {
+  va_list ap;
+
+  if (l > msglevel)
+    return;
+
+  va_start(ap, fmt);
+  vfprintf(stderr, fmt, ap);
+  va_end(ap);
+}
+
+static int
+progressbar(const char *prefix, int width, int num, int total, int lastpct) {
+  char bar[width + 1];
+  int pct = 0, fill = 0;
+
+  if (width <= 0 || total <= 0)
+    return 0;
+
+  pct = 100 * ((float) num / total);
+  if (pct == lastpct)
+    return lastpct;
+
+  if (pct == 100) {
+    lastpct = pct;
+  }
+
+  fill = (int) ((pct * width) / 100);
+  memset(bar, ' ', sizeof(char) * width);
+  memset(bar, '=', sizeof(char) * fill);
+  bar[fill]  = '>';
+  bar[width] = '\0';
+  log_msg(verbose, "\r* %s: % 3d%% [%s]", prefix, pct, bar);
+
+  return pct;
+}
+
+static int
+ftw_handler(const char *path, const struct stat *sb, int typeflag) {
+  const char *mime = NULL;
+  (void)(sb); /* unused */
+  if (typeflag == FTW_D)
+    return 0;
+  if (typeflag == FTW_DNR) {
+    fprintf(stderr, "! can't read: %s\n", path);
+    return 0;
+  }
+  if (typeflag == FTW_NS) {
+    fprintf(stderr, "! can't stat: %s\n", path);
+    return 0;
+  }
+  mime = magic_file(mcookie, path);
+  if (mime == NULL) {
+    fprintf(stderr, "! can't detect mimetype of file %s\n", path);
+    return 0;
+  }
+  if (strncmp(mime, "image/", 6) != 0)
+    return 0; /* not an image */
+  log_msg(debug, "~ found image file: %s\n", path);
+  if (!filelist_append(flist, path)) {
+    fprintf(stderr, "! can't add file to queue: out of memory");
+    return -1; /* stop ftw() */
+  }
+  return 0;
+}
+
+static void
+make_samples(filelist_t *list, simdb_t *simdb) {
+  const char *path;
+  int ret = 0, pct = 0;
+
+  assert(list != NULL);
+  assert(simdb != NULL);
+
+  for (int num = 1; num <= list->size; num++) {
+    path = filelist_get(list, num);
+    pct = progressbar("making samples", 50, num, list->size, pct);
+    ret = simdb_record_add(simdb, num, path, 0);
+    if (ret < 0) {
+      fprintf(stderr, "\r! can't add file #%d '%s' -- %s\n", num, path, simdb_error(ret));
+      simdb_record_del(simdb, num);
+      filelist_del(flist, num);
+    }
+  }
+  log_msg(verbose, "\n"); /* force newline after progress messages */
+
+  return;
+}
+
+static group_t *
+make_groups(filelist_t *list, simdb_t *simdb) {
+  simdb_search_t search;
+  group_t *groups = NULL, *group, **map = NULL;
+  int pct = 0, inum, gnum = 1; /* next group number */
+
+  assert(list != NULL);
+  assert(simdb != NULL);
+
+  if ((map = calloc(flist->size + 1, sizeof(group_t *))) == NULL) {
+    fprintf(stderr, "! can't allocate groups map: out-of-memory\n");
+    return NULL;
+  }
+
+  simdb_search_init(&search);
+  for (int num = 1; num < list->size; num++) {
+    if (!filelist_get(flist, num))
+      continue; /* file was not sampled */
+    if (map[num])
+      continue; /* this image already in some group */
+    pct = progressbar("grouping images", 50, num, list->size, pct);
+    simdb_search_byid(simdb, &search, num);
+    if (search.found <= 0)
+      continue; /* nothing similar found in database */
+    group = NULL;
+    /* try to find existing group */
+    for (int i = 0; i < search.found; i++) {
+      inum = search.matches[i].num;
+      if (map[inum] == NULL)
+        continue;
+      /* found some group */
+      group = map[inum];
+      break;
+    }
+    /* create new group if not found any */
+    if (!group) {
+      if ((group = group_create(gnum++, 0)) == NULL) {
+        fprintf(stderr, "\n! can't create new image group: out-of-memory\n");
+        break;
+      }
+      group->next = groups;
+      groups = group;
+    }
+    group_append(group, num);
+    /* place in map pointer to group for each found image */
+    for (int i = 0; i < search.found; i++) {
+      inum = search.matches[i].num;
+      group_append(group, inum);
+      map[inum] = group;
+    }
+  }
+  log_msg(verbose, "\n"); /* force newline after progress messages */
+
+  simdb_search_free(&search);
+  free(map);
+
+  return groups;
+}
+
+static void
+print_groups(filelist_t *list, group_t *groups) {
+  int inum = 0;
+
+  assert(list != NULL);
+
+  for (group_t *group = groups; group != NULL; group = group->next) {
+    for (int i = 0; i < group->size; i++) {
+      inum = group->ids[i];
+      puts(filelist_get(list, inum));
+    }
+    puts(""); /* force newline after group */
+  }
+}
+
+static void
+free_groups(group_t *groups) {
+  group_t *group = groups, *next = NULL;
+
+  while (group != NULL) {
+    next = group->next;
+    group_free(group);
+    free(group);
+    group = next;
+  }
+}
+
+int main(int argc, char **argv) {
+  simdb_t *simdb = NULL;
+  group_t *groups = NULL;
+  char tempdb[] = "/tmp/simdb-XXXXXX";
+  char path[PATH_MAX] = "";
+  int opt = -1, ret = 0;
+
+  if (argc <= 1)
+    usage(EXIT_FAILURE);
+
+  while ((opt = getopt(argc, argv, "hv")) != -1) {
+    switch (opt) {
+      case 'v':
+        if (msglevel < debug)
+          msglevel++;
+        break;
+      case 'h':
+        usage(EXIT_SUCCESS);
+        break;
+      default :
+        usage(EXIT_FAILURE);
+        break;
+    }
+  }
+
+  if (optind < argc) {
+    root = argv[optind];
+  } else {
+    usage(EXIT_FAILURE);
+  }
+
+  /* resolve root path */
+  if (realpath(root, path) == NULL) {
+    perror("Can't resolve given path");
+    exit(EXIT_FAILURE);
+  }
+
+  /* load magic database */
+  if ((mcookie = magic_open(MAGIC_MIME_TYPE)) == NULL) {
+    perror("can't open magic database");
+    return EXIT_FAILURE;
+  }
+  if (magic_load(mcookie, NULL) < 0) {
+    fprintf(stderr, "! can't load magic database: %s\n", magic_error(mcookie));
+    return EXIT_FAILURE;
+  }
+
+  /* make images filelist */
+  if ((flist = filelist_create(1000)) == NULL) {
+    fprintf(stderr, "! can't create filelist struct: out-of-memory?\n");
+    return EXIT_FAILURE;
+  }
+  log_msg(verbose, "* scanning for images\n");
+  if (ftw(path, &ftw_handler, 20) < 0) {
+    fprintf(stderr, "! ftw() error, aborting\n");
+    return EXIT_FAILURE;
+  } else {
+    log_msg(verbose, "* found %d images after initial scan\n", flist->size);
+  }
+  magic_close(mcookie);
+
+  mkstemp(tempdb);
+  unlink(tempdb);
+
+  if (!simdb_create(tempdb)) {
+    fprintf(stderr, "! can't create temporary simdb\n");
+    return EXIT_FAILURE;
+  }
+
+  if ((simdb = simdb_open(tempdb, SIMDB_FLAG_WRITE | SIMDB_FLAG_LOCKNB, &ret)) == NULL) {
+    fprintf(stderr, "! can't open temporary simdb: %s\n", simdb_error(ret));
+    return EXIT_FAILURE;
+  }
+
+  make_samples(flist, simdb);
+
+  groups = make_groups(flist, simdb);
+
+  if (groups) {
+    log_msg(verbose, "* found image groups:\n");
+    print_groups(flist, groups);
+    free_groups(groups);
+  }
+
+  simdb_close(simdb);
+  unlink(tempdb);
+
+  filelist_free(flist);
+  free(flist);
+
+  return EXIT_SUCCESS;
+}