Add a new example program which identifies empty folders (and optionally deletes them).

1 files changed, 85 insertions, 0 deletions

diff --git a/examples/emptyfolders.c b/examples/emptyfolders.c
new file mode 100644
index 0000000..70a909a
--- /dev/null
+++ b/examples/emptyfolders.c
@@ -0,0 +1,85 @@
+#include "common.h"
+
+static void prune_empty_folders(LIBMTP_mtpdevice_t *device, LIBMTP_file_t *files, LIBMTP_folder_t *folderlist, int do_delete)
+{
+  if(folderlist==NULL)
+    return;
+
+  if(folderlist->child == NULL) { // this *might* be empty
+    // therefore, check every file for this parent_id
+    int found = 0;
+    LIBMTP_file_t *file;
+    file = files;
+    while (file != NULL) {
+      if(file->parent_id == folderlist->folder_id) { // folder has a child
+        found = 1;
+        break;
+      }
+      file = file->next;
+    }
+
+    if(found == 0) { // no files claim this as a parent
+      printf("empty folder %u (%s)\n",folderlist->folder_id,folderlist->name);
+      if(do_delete) {
+        if (LIBMTP_Delete_Object(device,folderlist->folder_id)) {
+          printf("Couldn't delete folder %u\n",folderlist->folder_id);
+        }
+      }
+    }
+  }
+
+  prune_empty_folders(device,files,folderlist->child,do_delete); // recurse down
+  prune_empty_folders(device,files,folderlist->sibling,do_delete); // recurse along
+}
+
+int main (int argc, char **argv)
+{
+  // check if we're doing a dummy run
+  int do_delete = 0;
+  int opt;
+  while ( (opt = getopt(argc, argv, "d")) != -1 ) {
+    switch (opt) {
+    case 'd':
+      do_delete = 1;
+      break;
+    default:
+      break;
+    }
+  }
+
+  if(do_delete == 0) {
+    printf("This is a dummy run. No folders will be deleted.\n");
+    printf("To delete folders, use the '-d' option.\n");
+  }
+
+  LIBMTP_mtpdevice_t *device;
+  LIBMTP_folder_t *folders;
+  LIBMTP_file_t *files;
+
+  LIBMTP_Init();
+  device = LIBMTP_Get_First_Device();
+  if (device == NULL) {
+    printf("No devices.\n");
+    exit (0);
+  }
+
+  // Get file listing.
+  files = LIBMTP_Get_Filelisting_With_Callback(device,NULL,NULL);
+
+  // Get folder listing.
+  folders = LIBMTP_Get_Folder_List(device);
+
+  if(folders == NULL) {
+    printf("No folders found\n");
+  } else {
+    prune_empty_folders(device,files,folders,do_delete);
+  }
+
+  LIBMTP_destroy_folder_t(folders);
+  LIBMTP_destroy_file_t(files);
+
+  LIBMTP_Release_Device(device);
+  printf("OK.\n");
+  exit (0);
+}
+