1 files changed, 39 insertions, 0 deletions
diff --git a/setup.js b/setup.js
new file mode 100644
index 0000000..68bde3b
--- /dev/null
+++ b/setup.js
@@ -0,0 +1,39 @@
+const core = require('@actions/core');
+const io = require('@actions/io');
+const exec = require('@actions/exec');
+const tc = require('@actions/tool-cache');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+
+async function run() {
+  try {
+    const millVersion = core.getInput('mill-version');
+    
+    var millPath = tc.find('mill', millVersion);
+    if (!millPath) {
+      core.info('no cached version found');
+      core.info('downloading mill');
+      const downloadPath = await tc.downloadTool(`https://github.com/lihaoyi/mill/releases/download/${millVersion}/${millVersion}-assembly`);
+      await io.mkdirP('mill');
+      await io.cp(downloadPath, 'mill/mill');
+      fs.chmodSync('mill/mill', '0755')
+      millPath = await tc.cacheDir('mill', 'mill', millVersion);
+    } else {
+      core.info(`using cached version of mill: ${millPath}`);
+    }
+    core.addPath(millPath);
+
+    // warm up mill, this populates ~/.mill
+    // TODO: once caching across workflow invocations is available, this dorectory should be cached too
+    //       (note that caching would only help for multiple jobs, as data is cached in the home directory
+    //       which is shared across steps)
+    await exec.exec('mill', ['version']);
+  }
+  catch (error) {
+    core.setFailed(error.message);
+  }
+
+}
+
+run()