path utils

Author: softmarshmallow

cli/_utils/path/index.ts

@@ -0,0 +1,42 @@
+import fs from "fs";
+import path from "path";
+
+/**
+ * finds file with name in cwd
+ *
+ * e.g. package.json -> <cwd>/package.json
+ *
+ * @param name
+ * @param cwd
+ * @returns
+ */
+export function find_in_cwd(name, cwd = process.cwd()) {
+  const file = path.join(cwd, name);
+  if (fs.existsSync(file)) {
+    return file;
+  }
+  return null;
+}
+
+/**
+ * find file in parent directory (recursively)
+ * cwd
+ * ../package.json
+ * ../../package.json
+ * ../../../package.json
+ * ...
+ */
+export function find_in_parent(name, cwd = process.cwd(), recursively = true) {
+  const parent_dir = path.dirname(cwd);
+  if (parent_dir === cwd) {
+    return null;
+  }
+  const file = path.join(parent_dir, name);
+  if (fs.existsSync(file)) {
+    return file;
+  }
+  if (recursively) {
+    return find_in_parent(name, parent_dir, recursively);
+  }
+  return null;
+}

cli/npm/index.ts

@@ -1,4 +1,41 @@
+import type { IPackageManifest } from "@web-builder/nodejs";
+import path from "path";
+import { find_in_cwd, find_in_parent } from "../_utils/path";
+
+const _PACKAGE_JSON = "package.json";
+
 /**
- * finds a package root with package.json search
+ * finds a npm pacakge root with package.json search
  */
-export function findPackageRoot() {}
+export function locatePackage(cwd = process.cwd()): {
+  base_dir: string;
+  package_json: string;
+  manifest: IPackageManifest;
+} | null {
+  const packagejson = find_in_cwd(_PACKAGE_JSON, cwd);
+  if (packagejson) {
+    return {
+      base_dir: path.dirname(packagejson),
+      package_json: packagejson,
+      manifest: read(packagejson),
+    };
+  }
+  const packagejson_in_parent_dir = find_in_parent(_PACKAGE_JSON, cwd, true);
+  if (packagejson_in_parent_dir) {
+    return {
+      base_dir: path.dirname(packagejson_in_parent_dir),
+      package_json: packagejson_in_parent_dir,
+      manifest: read(packagejson_in_parent_dir),
+    };
+  }
+  return null;
+}
+
+/**
+ * returns the config object by reading package.json file
+ * @param path
+ * @returns
+ */
+export function read(path): IPackageManifest {
+  return require(path);
+}