this post was submitted on 22 Mar 2024
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Rust Programming

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I have a plugin trait that includes some heavy types that would be almost impossible to wrap into a single API. It looks like this:

pub struct PluginContext<'a> {
    pub query: &'a mut String,
    pub gl_window: &'a GlutinWindowContext,
    flow: PluginFlowControl,
    pub egui_ctx: &'a Context,
    disable_cursor: bool,
    error: Option<String>,
}
pub trait Plugin {
    fn configure(&mut self, builder: ConfigBuilder) -> Result<ConfigBuilder, ConfigError> {
        Ok(builder)
    }
    fn search(&mut self, ui: &mut Ui, ctx: &mut PluginContext<'_>);
    fn before_search(&mut self, _ctx: &mut PluginContext<'_>) {}
}

Here is what I considered:

  1. Keeping all plugins in-repo. This is what I do now, however I'd like to make a plugin that would just pollute the repository. So I need another option that would keep the plugins' freedom as it is right now, but with the possibility to move the plugin out to a separate repository.
  2. I tried to look into dynamic loading, and since rust doesn't have a stable ABI, I'm okay with restricting the rust versions for the plugin ecosystem. However, I don't think it's possible to compile this complex API into a dynamic lib and load it safely.
  3. I'm also ok with recompiling the app every time I need a new plugin, but I would like to load these plugins automatically, so I don't want to change the code every time I need a new plugin. For example, I imagine loading all plugins from a folder. Unfortunately, I didn't find an easy solution for this neither. I think I will write a build macro that checks the ~/.config/myapp/plugins and include all of them into the repo.

Do you have any better ideas, suggestions? Thanks in advance.

(For context, this the app I'm writing about: https://github.com/fxdave/vonal-rust)

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[โ€“] [email protected] 1 points 8 months ago (1 children)

If there won't be too many different plugins, maybe having a feature for each plugin would work. Then you could use --features=... when compiling to select the plugins you need.

[โ€“] [email protected] 1 points 8 months ago

Thanks, I forgot to mention but that's what I do now. My problem with this is that I would like to make a plugin that makes sense only for me and not for the other users. I could maintain my personal fork though.