love.filesystem.getDirectoryItems
Returns a table with the names of files and subdirectories in the specified path. The table is not sorted in any way; the order is undefined.

If the path passed to the function exists in the game and the save directory, it will list the files and directories from both places.
files = love.filesystem.getDirectoryItems( dir )
dir string The directory.
files table A sequence with the names of all files and subdirectories as strings.
files = love.filesystem.getDirectoryItems( dir, callback )
dir string The directory.
callback function A function which is called for each file and folder in the directory. The filename is passed to the function as an argument.
files table A sequence with the names of all files and subdirectories as strings.