Projects using Rhai

[stevedonovan]

Just a tracking issue for projects.

Apparently I've got the first published crate that uses Rhai as a dependency:

https://github.com/stevedonovan/findr

[luciusmagn]

Awesome! I like the idea of a find that doesn't have an arcane obscure syntax. Yep, you are the first person to actually have a crate using it published. Good job :D

[zesterer]

@luciusmagn We're considering using Rhai for a game project (https://www.github.com/veloren/game/). The team has a few questions about the language first though. Where is best to ask them?

[luciusmagn]

I'd say here, or you can write me an email at luk.hozda@gmail.com. I am currently out of home, so it may take a while for me to respond Dne pá 6. 7. 2018 10:48 uživatel Joshua Barretto <notifications@github.com> napsal:

…

@luciusmagn <https://github.com/luciusmagn> We're considering using Rhai for a game project (https://www.github.com/veloren/game/). The team has a few questions about the language first though. Where is best to ask them? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#69 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AIAzh6bJeD2eB_VIbrajwJi6iVse0VwYks5uDyRugaJpZM4TK_Rr> .

[0x8f701]

casbin-rs is also using rhai!

[MarkuBu]

I consider using Rhai for a game too. But I'm in the planning process and far away from any code

Another option for scripting would be Mun, but this is also in an early state

[schungx]

@MarkuBu my $0.02 worth - use Rhai if you want tight integration with lots of functionalities written in Rust. If you want to basically write your game logic in a scripting language, probably Lua is much more suited for this purpose.

[MarkuBu]

@schungx why? Because of the performance? I know that Lua is fast, even without the JIT

[schungx]

Yes. Rhai is an AST-walking interpreter. It is never going to break any speed records. So use it where the majority of your application's time is not spend in the script.

[MarkuBu]

Ok, thanks.

[sunng87]

I'm looking for a scripting language to add dynamic helper support for my template engine handlebars-rust. By far Rhai seems to be a good fit because of its inter-operatability with rust data. I will be writing poc code recently and seeking for help with you.

[schungx]

No prob!

[sunng87]

FYI support for rhai script helper has been released in handlebars 3.1.0 with a feature flag script_helper https://github.com/sunng87/handlebars-rust/blob/master/examples/script.rs

[Pebaz]

I'm trying to integrate Rhai into my game but for the life of me I can't figure out how to pass a Vec of a custom Rust type (already registered with the engine) and access the indices from it.

I can successfully pass it but when the script tries to access any index it crashes.

[schungx]

When you pass a Vec into Rhai, it treats it as a custom type. You're responsible for registering an API for use with that API. In your case, you'd want to register an indexer.

engine
    .register_type_with_name::<Vec<MyType>>("Vec<MyType>")
    .register_indexer_get_set(
        |v: &mut Vec<MyType>, i: INT| v[i],
        |v: &mut Vec<MyType>, i: INT, value: MyType| v[i] = value)
    .register_fn("len", |v: &mut Vec<MyType>| v.len() as INT)
    .register_get("len", |v: &mut Vec<MyType>| v.len() as INT)
    .register_fn("contains", |v: &mut Vec<MyType>, value: MyType| v.contains(&value))
    .register_fn("is_empty", |v: &mut Vec<MyType>| v.is_empty())
    .register_get("is_empty", |v: &mut Vec<MyType>| v.is_empty());

After a while it gets clumsy. You'd want to use a plugin module to define the API instead.

[schungx]

Alternatively, you can convert the Vec<T> into a Rhai Array and it'll work with Rhai just fine.

// assuming 'my_vec' is 'Vec<T>'
let array: Dynamic = my_vec.into();

The catch is that a Rhai Array is dynamically typed, meaning that you cannot restrict it to hold only MyType.