This is a simple Python script to import a directory of ROM files into Lutris. The directory must contain only games from one platform. I have only tested this on my own computer for a limited number of platforms.
I don't really know what will happen if Lutris is open during the import, so make sure to restart Lutris immediately after importing, or close it before the import - this script will write directly to Lutris's SQLite database, so proceed with caution.
PyYAML
pip install --user --upgrade lutris-bulk-adder
-d / --directory: Directory to scan for ROM files.
-r / --runner: Slug name of Lutris runner to use (e.g. dolphin, snes9x)
-p / --platform: Platform name. A list of platform names is included in the script, but if one is not included, you can figure it out by looking at the Lutris runner class definitions for the value(s) listed under the platforms member.
These default to the default locations that Lutris will install to.
-ld / --lutris-database: Path to the Lutris SQLite database. Default: ~/.local/share/lutris/pga.db
-ly / --lutris-yml-dir: Directory containing Lutris installed game YAML files. Default: ~/.config/lutris/games
-lg / --lutris-game-dir: Lutris games installation directory. This shouldn't do anything as ROMs aren't installed, but the Lutris database needs it. Default: ~/Games
-f / --file-types: Space-separated list of file types to scan for. Defaults to iso,zip,sfc,gba,gbc,gb,md,n64,nes,32x,gg,sms
-o / --game-options: Additional options to write to the YAML file under the "game" key (e.g. platform number as required for Dolphin)
-s / --strip-filename: Space-separated list of strings to strip from filenames when generating game names.
-n / --no-write: Do not write YML files or alter Lutris database, only print data to be written out to stdout. (i.e. dry run)
lutris_bulk_adder -d /data/Emulation/Wii -r dolphin -s '(USA)' -p "Nintendo Wii" -o platform=1
Adds all files in /data/Emulation/Wii to the dolphin runner, ignoring substrings containing (USA) in the filename when deriving the game name, for the Nintendo Wii platform, and adds platform: '1' to the game key in the YAML file.