This repo contains a Go module/pakage to make NBT (named binary tags) readable and editable in a Lua script environment, and a command-line interface similar to native lua to run Lua scripts which can load, modify, and write NBT data.

Lua NBT functions

• use_bedrock_encoding() - Sets future NBT encoding decoding using the Bedrock Edition (little endian) format
• use_java_encoding() - Sets future NBT encoding decoding using the Java Edition (little endian) format
• loadnbt(path) - Where path is a path to an NBT file, it will auto-detect whether it's compressed and populate the nbt variable with its data
• savenbt(path, compress) - Converts nbt back to NBT and writes to path. compress is true for compressed output and ommitted or false for uncompressed output.

Format of nbt variable in Lua

• lua's global nbt is a table {} in which each top-level nbt tag is
• in many cases there is only one top-level nbt compound tag, so nbt[1] is that tag, and nbt[1][1], nbt[1][2]... are the first-tier tags you're looking for. Try nbt[1][1].name or the equivalent nbt[1][1]["name"]
• All tags (except tag 0 / end) are added as tables, and they have a tagType, value, and name
• Compound and list tags' values are again tables of the values beginning with [1]

Lua examples

See /examples folder for example lua scripts.

Go code example

See examples/go-example.go for how to use the package

Go exported functions

• func Nbt2Lua(b []byte, L *lua.LState) error - pass it an uncompressed nbt byte array and the gopher-lua state variable, and it will populate the nbt global variable in Lua with a table hierarchy representing the nbt data
• func Lua2Nbt(L *lua.LState) ([]byte, error) - pass it the gopher-lua state variable, and it will convert the nbt global variable into an nbt byte array and return it
• func UseBedrockEncoding() - This makes any future conversions read/write the nbt usable by Minecraft Bedrock Edition (little endian). This is the default state when the package is loaded.
• func UseJavaEncoding() - This makes any future conversions read/write the nbt usable by Minecraft Java Edition (big endian)
• func NewState() *lua.LState - This can be used in place of calling lua.NewState for one less include in the client program, and it calls Nlua before returing LState
• func Nlua(L *lua.LState) - Nlua injects loadnbt() and (future) savenbt() functions into a lua environment