UnifiedOptions

Before the game reads options.txt, the mod can copy a shared universal.txt file into the game's home directory and merge it in. The list of options kept in sync is set in config.toml, and the file that holds the shared values can be moved to another directory inside the synchronization setup. Settings outside that list stay under the normal options.txt file for each install.

Key bindings are the main case: a file written by the 1.12 release stores controls as numbers, while 1.16 and later use named keys. The mod converts 1.12 numerical values to the modern named form automatically, and it can also load a 1.12 options.txt from a 1.16 or later install when that file is needed again. Players who run a modpack can use an extras directory to supply default values, so a pack's map and tooltip settings are applied on first launch without copying configs by hand.

The mod can be disabled completely, or its generated config.toml can be deleted so that a new default one is created. Its set of synchronized options and the location of the universal file are both set in that config. The mod is distributed under the GNU Lesser General Public License v3.0 only and is open source, with public source code and an issue tracker.