Add check-latest functionality (#406)

src/find-python.ts

@@ -33,12 +33,34 @@ function binDir(installDir: string): string {
 export async function useCpythonVersion(
   version: string,
   architecture: string,
-  updateEnvironment: boolean
+  updateEnvironment: boolean,
+  checkLatest: boolean
 ): Promise<InstalledVersion> {
+  let manifest: tc.IToolRelease[] | null = null;
   const desugaredVersionSpec = desugarDevVersion(version);
-  const semanticVersionSpec = pythonVersionToSemantic(desugaredVersionSpec);
+  let semanticVersionSpec = pythonVersionToSemantic(desugaredVersionSpec);
   core.debug(`Semantic version spec of ${version} is ${semanticVersionSpec}`);
 
+  if (checkLatest) {
+    manifest = await installer.getManifest();
+    const resolvedVersion = (
+      await installer.findReleaseFromManifest(
+        semanticVersionSpec,
+        architecture,
+        manifest
+      )
+    )?.version;
+
+    if (resolvedVersion) {
+      semanticVersionSpec = resolvedVersion;
+      core.info(`Resolved as '${semanticVersionSpec}'`);
+    } else {
+      core.info(
+        `Failed to resolve version ${semanticVersionSpec} from manifest`
+      );
+    }
+  }
+
   let installDir: string | null = tc.find(
     'Python',
     semanticVersionSpec,
@@ -50,7 +72,8 @@ export async function useCpythonVersion(
     );
     const foundRelease = await installer.findReleaseFromManifest(
       semanticVersionSpec,
-      architecture
+      architecture,
+      manifest
     );
 
     if (foundRelease && foundRelease.files && foundRelease.files.length > 0) {