WIP: Fix Mill download link fix for 1.x and 0.12.16

README.md

@@ -253,7 +253,7 @@ When it launches it will send PR to update all the repos selected in step (2.2).
     # Steward will still respect the version specified in
     # your repository while updating it.
     #
-    # Default: 0.12.5
+    # Default: 0.12.16
     mill-version: ''
 
     # Other Scala Steward arguments not yet supported by

action.yml

@@ -116,7 +116,7 @@ inputs:
       just affect the global `mill` executable. Scala 
       Steward will still respect the version specified in
       your repository while updating it.
-    default: "0.12.5"
+    default: "0.12.16"
     required: false
   other-args:
     description: |

src/modules/mill.ts

@@ -19,7 +19,9 @@ export async function install(): Promise<void> {
     if (cachedPath) {
       core.addPath(cachedPath)
     } else {
-      const millUrl = `https://github.com/lihaoyi/mill/releases/download/${millVersion}/${millVersion}`
+      const artifactSuffix = getArtifactSuffix()
+      const downloadExtension = 'exe'
+      const millUrl = `https://repo1.maven.org/maven2/com/lihaoyi/mill-dist${artifactSuffix}/${millVersion}/mill-dist${artifactSuffix}-${millVersion}.${downloadExtension}`
 
       core.debug(`Attempting to install Mill from ${millUrl}`)
 
@@ -46,3 +48,27 @@ export async function install(): Promise<void> {
 export async function remove(): Promise<void> {
   await io.rmRF(path.join(path.join(os.homedir(), 'bin'), 'mill'))
 }
+
+function getArtifactSuffix(): string {
+  const platform = os.platform() // 'linux', 'darwin', 'win32'
+  const arch = os.arch() // 'x64', 'arm64', etc.
+
+  let suffix = ''
+
+  if (platform === 'linux') {
+    suffix = arch === 'arm64'
+      ? '-native-linux-aarch64'
+      : '-native-linux-amd64'
+  } else if (platform === 'darwin') {
+    suffix = arch === 'arm64'
+      ? '-native-mac-aarch64'
+      : '-native-mac-amd64'
+  }
+
+  if (suffix === '') {
+    core.error('This native mill launcher supports only Linux and macOS.')
+    throw new Error('Unable to detect Mill artifact suffix')
+  } else {
+    return suffix
+  }
+}