Initial version

src/main.ts

@@ -0,0 +1,27 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+
+import * as args from './args';
+
+async function do_exec(program: string, args: string[]) {
+    try {
+        await exec.exec(program, args);
+    } catch (error) {
+        core.setFailed(error.message);
+    }
+}
+
+async function run() {
+    let opts = args.toolchain_args();
+    await do_exec('rustup', ['toolchain', 'install', opts.name]);
+
+    if (opts.default) {
+        await do_exec('rustup', ['default', opts.name]);
+    }
+
+    if (opts.override) {
+        await do_exec('rustup', ['override', opts.name]);
+    }
+}
+
+run();