Simple and performant hot-reloading for Rust

Related tags

Learning Resources reloady
Overview

reloady

Simple, performant hot-reloading for Rust.

Requires Rust nightly and only works on Linux for now.

installing CLI

To install the CLI helper cargo hot-reload:

cargo install --path cargo-hot-reload

running examples

To run an example, run cargo hot-reload inside its directory.

Note: initial builds may take a while to complete at first, but will be fast afterwards.

Reloady's performance goal is to hot-reload in under 2 seconds, which it currently achieves.

usage

First, add the dependency to your Cargo.toml (reloady is not published on crates.io yet):

[dependencies]
reloady = { path = "../../reloady" }

Next, add the following features to the top of your lib.rs or main.rs:

#![feature(link_args)]
#![feature(linkage)]

Lastly, annotate any function you would like to hot-reload with the attribute:

#[reloady::hot_reload]
fn hot_reload_me() {
    /* ... */
}

And hot reload your code with:

$ cargo hot-reload

Note that functions are only reloaded when they are called, so reloady works best when it is annotating a function that is called in a loop. For more information on this, see examples.

features

  • hot reloads in <2s
  • zero-cost when not hot-reloading (compiled out entirely!)
  • (coming soon) hot reloading structs/state
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Comments
  • The link_args attribute has been removed

    The link_args attribute has been removed

    See https://github.com/rust-lang/cargo/pull/9557.

    A temporary fix I found was to remove all references to it in the source code and add a build script that prints cargo:rustc-link-arg=-export-dynamic to my app (I'm on Linux).

    Could it perhaps be possible to export a helper for users to put in their build scripts that prints the correct cargo:rustc-link-arg directive for their platform and selected feature set?

    Or is this only needed for the reloady library and not for the actual projects that use it?
    Because in that case I feel like the fix would be easier.

    opened by ohmree 6
Releases(v0.1.0)
Owner
Anirudh Balaji
I like to write useful code.
Anirudh Balaji
GitHub
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