rewrite it all

src/workspace.ts

@@ -0,0 +1,42 @@
+import path from "path";
+
+import { getCmdOutput } from "./utils";
+
+export class Workspace {
+  constructor(public root: string, public target: string) {}
+
+  public async getPackages(): Promise<Packages> {
+    let packages: Packages = [];
+    try {
+      const meta: Meta = JSON.parse(
+        await getCmdOutput("cargo", ["metadata", "--all-features", "--format-version", "1"]),
+      );
+      for (const pkg of meta.packages) {
+        if (!pkg.manifest_path.startsWith(this.root)) {
+          continue;
+        }
+        const targets = pkg.targets.filter((t) => t.kind[0] === "lib").map((t) => t.name);
+        packages.push({ name: pkg.name, version: pkg.version, targets, path: path.dirname(pkg.manifest_path) });
+      }
+    } catch {}
+    return packages;
+  }
+}
+
+export interface PackageDefinition {
+  name: string;
+  version: string;
+  path: string;
+  targets: Array<string>;
+}
+
+export type Packages = Array<PackageDefinition>;
+
+interface Meta {
+  packages: Array<{
+    name: string;
+    version: string;
+    manifest_path: string;
+    targets: Array<{ kind: Array<string>; name: string }>;
+  }>;
+}