1 files changed, 37 insertions, 0 deletions

diff --git a/packages/turbo-ignore/src/getWorkspace.ts b/packages/turbo-ignore/src/getWorkspace.ts
new file mode 100644
index 0000000..e0b3167
--- /dev/null
+++ b/packages/turbo-ignore/src/getWorkspace.ts
@@ -0,0 +1,37 @@
+import fs from "fs";
+import path from "path";
+import { error, info } from "./logger";
+import { TurboIgnoreArgs } from "./types";
+
+export function getWorkspace(args: TurboIgnoreArgs): string | null {
+  const { directory = process.cwd(), workspace } = args;
+
+  // if the workspace is provided via args, use that
+  if (workspace) {
+    info(`Using "${workspace}" as workspace from arguments`);
+    return workspace;
+  }
+
+  // otherwise, try and infer it from a package.json in the current directory
+  const packageJsonPath = path.join(directory, "package.json");
+  try {
+    const raw = fs.readFileSync(packageJsonPath, "utf8");
+    const packageJsonContent: Record<string, string> & { name: string } =
+      JSON.parse(raw);
+
+    if (!packageJsonContent.name) {
+      error(`"${packageJsonPath}" is missing the "name" field (required).`);
+      return null;
+    }
+
+    info(
+      `Inferred "${packageJsonContent.name}" as workspace from "package.json"`
+    );
+    return packageJsonContent.name;
+  } catch (e) {
+    error(
+      `"${packageJsonPath}" could not be found. turbo-ignore inferencing failed`
+    );
+    return null;
+  }
+}