I want to allow the users of my project be able to write the driving logic, while I provide the tools. What are some embedded scripting languages in Rust that can be sandboxed and are easy for absolute beginners?

edit: Thanks for all of your answers, I decided to go with lua using mlua

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[–] ignotum@lemmy.world 12 points 2 weeks ago (2 children)

Many languages can be compiled to wasm, and it's quite easy to load and run wasm from rust

That way you could give the user multiple options, they could write it in rust, c, c++, javascript, etc

[–] Bunbury@programming.dev 5 points 1 week ago

Although the OP has already decided to go with Lua, if anyone else looking at this thread is considering their options for making a plugin system, WASM/WASI is an excellent choice - mostly because it allows users to use Python (a favorite among programming newbies) along with any other language that compiles to WebAssembly (which will eventually be all languages).

You can even use something like Extism which is purpose-built as a drop-in library for creating a plugin system with WASM plugins, or you can use other runtime options like Wasmtime (built in Rust, from the ByteCode Alliance - where the WASI spec is being developed) or the WasmEdge runtime (built in C++, which is a CNCF project and is already being used in areas like eBPF to help users build Linux Kernel extensions).

In short, if you're building a project that has to be maintained long-term and you need a plugin system, then choose WebAssembly - you can't go wrong.

Cheers!

[–] AsudoxDev@programming.dev 4 points 2 weeks ago (1 children)

WASM is a bit overkill and is also complicated. I need a simple scripting language that won't stress the users out. As mentioned in my post, I expect them to be absolute beginners.

[–] ignotum@lemmy.world 8 points 2 weeks ago (1 children)

I didn't mean that the users would write wasm, just that they could write it in some language, then your program would compile it to wasm and run it

Gives some flexibility as to the choice of language and it runs sandboxed

[–] AsudoxDev@programming.dev 4 points 2 weeks ago* (last edited 2 weeks ago)

yeah no no, who writes wasm by hand?

it's just that this interoperability with all languages is a bit overkill. I also don't know how I would expose a rust struct that has methods in wasm