gha-main

Write GitHub Actions in Rust!

This crate provides two convenience macros to make it easier to write GitHub Actions in Rust.

How to use:

1. Annotate your main() function with #[gha_main].
2. Add return type GitHubActionResult.
3. Use the ? operator to propagate errors.
4. Return ouputs (anything that implements Display) to the action runner with the gha_output!() macro so they can be used in later workflow steps or other actions.

Example usage:

use std::env;
use gha_main::{gha_main, gha_output, GitHubActionResult};

#[gha_main]
fn main() -> GitHubActionResult {
    let args: Vec<String> = env::args().collect();
    let input = &args[1];
    let parsed_u32 = input.parse::<u32>()?;
    gha_output!(parsed_u32);
    Ok(())
}

Values wrapped in gha_output!() are returned to the runner with the output name equal to the Rust variable name. In the example above, if the action is called with input "5", the parsed_u32 output will be set to 5.

Errors propagated via the ? operator are returned to the runner as the error output. The error values are formatted using [anyhow::Error]'s Display implementation.

Example actions

The /example-actions folder contains several examples that demonstrate how GitHub Actions can be written in Rust.

License: Apache-2.0 OR MIT