gobindlua

Generate bindings for GopherLua

gobindlua generates GopherLua bindings and LuaLS definitions. It can generate bindings and definitions for structs, interfaces, and package functions.

Example

gobindlua is designed to be used with go:generate:

// Replace *version* with a gobindlua version.

//go:generate go run github.com/ChrisTrenkamp/gobindlua/gobindlua@*version*
type Joiner interface {
    Join() string
	gobindlua.LuaUserData
}

//go:generate go run github.com/ChrisTrenkamp/gobindlua/gobindlua@*version*
type SomeStruct struct {
    SomeStrings []string
}

//gobindlua:constructor
func NewSomeStruct(strs []string) SomeStruct {
    return SomeStruct {
        SomeStrings: strs,
    }
}

//gobindlua:function
func (s SomeStruct) Join() string {
    return strings.Join(s.SomeStrings, ", ")
}

... this will generate a file called lua_SomeStruct.go. The generated bindings will work seamlessly with Lua tables:

local some_struct = require "some_struct"
local my_struct = some_struct.new({"foo", "bar", "eggs", "ham"})
print(my_struct:join()) --[[ foo, bar, eggs, ham ]]

It will also generate LuaLS definitions for the struct and interface:

---lua_SomeStruct_definitions.go
---@meta some_struct

local some_struct = {}

---@return some_struct_fields
function some_struct.new() end

---@class some_struct_fields : joiner
---@field public my_string string[]
local my_struct = {}

---@return string
function some_struct_fields:join() end

return some_struct

---lua_Joiner_definitions.go
---@meta joiner

---@class joiner
local joiner = {}

---@return string
function joiner.join() end

return joiner

Enable interface discovery

If you want to generate interface definitions, create a gobindlua-conf.txt file in the root of your Go project (next to the go.mod file), with the list of Go modules that have generated gobindlua source files (including your own project). Any interface field listed in the gobindlua-conf.txt and has a //go:generate directive will be picked up and generated as its own type in the Lua definitions. Otherwise, it will be generated as an any type.

Tutorials

See the docs for instructions on how to use gobindlua.

Hacking gobindlua

When making changes to gobindlua, you can build and test it by running:

go generate ./... && go test ./...

TODO:

• Provide a way to rename structs/packages for the generated Lua bindings.
• godoc comments for structs, fields, and methods should be attached to the lua definitions.