mirror of https://github.com/Hilbis/Hilbish
93 lines
2.3 KiB
Go
93 lines
2.3 KiB
Go
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package main
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import (
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"plugin"
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"hilbish/util"
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rt "github.com/arnodel/golua/runtime"
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)
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// #interface module
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// native module loading
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// #field paths A list of paths to search when loading native modules. This is in the style of Lua search paths and will be used when requiring native modules. Example: `?.so;?/?.so`
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/*
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The hilbish.module interface provides a function to load
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Hilbish plugins/modules. Hilbish modules are Go-written
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plugins (see https://pkg.go.dev/plugin) that are used to add functionality
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to Hilbish that cannot be written in Lua for any reason.
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Note that you don't ever need to use the load function that is here as
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modules can be loaded with a `require` call like Lua C modules, and the
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search paths can be changed with the `paths` property here.
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To make a valid native module, the Go plugin has to export a Loader function
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with a signature like so: `func(*rt.Runtime) rt.Value`.
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`rt` in this case refers to the Runtime type at
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https://pkg.go.dev/github.com/arnodel/golua@master/runtime#Runtime
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Hilbish uses this package as its Lua runtime. You will need to read
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it to use it for a native plugin.
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Here is some code for an example plugin:
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```go
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package main
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import (
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rt "github.com/arnodel/golua/runtime"
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)
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func Loader(rtm *rt.Runtime) rt.Value {
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return rt.StringValue("hello world!")
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}
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```
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This can be compiled with `go build -buildmode=plugin plugin.go`.
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If you attempt to require and print the result (`print(require 'plugin')`), it will show "hello world!"
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*/
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func moduleLoader(rtm *rt.Runtime) *rt.Table {
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exports := map[string]util.LuaExport{
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"load": {moduleLoad, 2, false},
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}
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mod := rt.NewTable()
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util.SetExports(rtm, mod, exports)
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return mod
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}
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// #interface module
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// load(path)
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// Loads a module at the designated `path`.
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// It will throw if any error occurs.
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func moduleLoad(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
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if err := c.CheckNArgs(1); err != nil {
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return nil, err
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}
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path, err := c.StringArg(0)
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if err != nil {
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return nil, err
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}
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p, err := plugin.Open(path)
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if err != nil {
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return nil, err
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}
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value, err := p.Lookup("Loader")
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if err != nil {
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return nil, err
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}
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loader, ok := value.(func(*rt.Runtime) rt.Value)
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if !ok {
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return nil, nil
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}
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val := loader(t.Runtime)
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return c.PushingNext1(t.Runtime, val), nil
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}
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