cargo/src/main.ts

const path = require('path');

import * as core from '@actions/core';

import * as input from './input';
import {Cargo, Cross} from '@actions-rs/core';

export async function run(actionInput: input.Input): Promise<void> {
    let program;
    if (actionInput.useCross) {
        program = await Cross.getOrInstall();
    } else {
        program = await Cargo.get();
    }

    let args: string[] = [];
    if (actionInput.toolchain) {
        args.push(`+${actionInput.toolchain}`);
    }
    args.push(actionInput.command);
    args = args.concat(actionInput.args);

    await program.call(args);
}

async function main(): Promise<void> {
    const actionInput = input.get();

    const matchersPath = path.join(__dirname, '.matchers');
    console.log(`::add-matcher::${path.join(matchersPath, 'rust.json')}`);
    // Enabling `rustfmt` problem matcher only if `cargo fmt` is called
    if (actionInput.command == 'fmt') {
        console.log(`::add-matcher::${path.join(matchersPath, 'rustfmt.json')}`);
    }

    try {
        await run(actionInput);
    } catch (error) {
        core.setFailed(error.message);
    }
}

main();