chunkAt prefers the store over the generator, and nothing invalidated a stored
chunk when the generator changed. Combined with four region files committed to
the repo, the chunks around spawn were frozen output from an older generator:
worldgen fixes looked like they did nothing in exactly the area you land in when
you join, and a fresh clone inherited that world.
Chunks now carry a RegionIOGeneratorVersion stamp, written on save and checked on
load; a mismatch returns ErrChunkNotFound so the caller regenerates. Chunks
written before the stamp existed have no tag, decode as 0, and are invalidated
the same way. Bump the constant in any commit that changes generator output.
This is deliberately per-chunk and deliberately quiet. The world metadata file
already guards the seed, where a mismatch means two incompatible terrains and
refusing to open is right. A generator change is routine by comparison and should
just regenerate.
world/region/*.mca and chat.md are untracked (left on disk) and /world/ is
gitignored, superseding the narrower /world/regionio-world.json rule, along with
/.refjava/ and root-level session transcripts.
CLAUDE.md covers the parts of working here that README does not: the
no-dependencies rule, the version-stamp rule and why forgetting it looks like a
failed fix, where the vanilla ground truth lives and how to query the jar
directly with unzip and javap, the precedent for dumping runtime constants with a
throwaway Java program, and an honest list of which layers are bit-exact versus
approximated.
The world now survives restarts: chunks load from disk (read-through
cache) and player edits persist via async autosave + a final SaveAll on
shutdown. RegionIO finally does region I/O.
- world/regionfile.go: Anvil .mca container — 8192-byte header
(offset + timestamp tables), 4096-byte sectors, zlib chunk records.
- world/compress.go: zlib deflate/inflate for chunk payloads.
- world/store.go: chunk <-> Level-nested NBT (per-section
block_states/biomes palettes, WORLD_SURFACE heightmap, DataVersion
4790, yPos -4) via the existing nbt package; Store opens one
RegionFile per region with proper floor-division coords.
- world/state_names.go: id->name bridge from the embedded blocks.json
report so network int-IDs round-trip through the disk named palette.
- world/encode.go: GetBiome read accessor for serialization.
- world/cache.go: read-through (disk then generation), dirty tracking,
StartAutosave (returns a done channel so the saver exits before
Close), SaveAll, NewCacheWithStore.
- server.go + main.go: Config.WorldDir (default "world"), -world flag,
autosave loop every 30s, SaveAll + store Close on signal.
- Tests: region round-trip/absent/overwrite, chunk NBT round-trip,
end-to-end save-reload, negative chunk coords, autosave persistence.
