qBittorrent stores the .torrent files of all torrents loaded within the client within a designated folder, paired with .fastresume files with client metadata. In Windows, this directory is located by default at C:\Users\<user>\AppData\Local\qBittorrent\BT_backup).
The .torrent files are not stored with their original filenames (as imported), but with the hashes of the torrent info of the respective .torrent. This tool, qBittorrent-collector, iterates over the .torrent files in a source folder, replaces their filename with the original name found in the .torrent metadata, and copies them over to a destination folder. This is intended to help a user migrate or otherwise backup the torrents loaded in qBittorrent.
The original intent was to access the BT_backup folder in AppData directly, but Windows permissions prevented this. This approach is documented in old/collector2.py. The actual tool is collector.py, which is dependent on namefinder.py.
namefinder.py contains the function used for extracting the name from the torrent metadata. Doing it the proper way -- via decoding the bencode and accessing the .torrent metadata dictionary -- led to some issues with torrent files stored in BT_backup, so a butched quick and dirty approach was used instead.
Synopsis: python collector.py <source_dir> [<dest_dir>]
Find your qBittorrent installation's BT_backup folder, located by default on Windows at C:\Users\<user>\AppData\Local\qBittorrent\BT_backup). You likely will not have permission to use this folder directly, so copy/paste the files to a source directory of your choice.
Running python collector.py <source_dir> will result in the output files' placement defaulting to ./output in the directory from which collector.py resides. Optionally specify a destination directory as the next parameter.