Adding support for project configuration files (#3)

src/config.ts

@@ -0,0 +1,47 @@
+import fs from 'fs';
+import path from 'path';
+
+const JSON_CONFIG_FILE_NAME = 'ldd.json';
+
+const DEFAULT_CONFIG: JsonConfiguration = {
+  dbName: undefined,
+};
+
+interface JsonConfiguration {
+  dbName?: string;
+}
+
+const findAndReadConfig = () => {
+  try {
+    let startdir = process.cwd();
+    let userConfigData = '{}';
+
+    while (true) {
+      var list = fs.readdirSync(startdir);
+
+      if (list.indexOf(JSON_CONFIG_FILE_NAME) != -1) {
+        // Found
+        console.info(`Loading configuration from: ${path.join(startdir, JSON_CONFIG_FILE_NAME)}`);
+
+        userConfigData = fs.readFileSync(path.join(startdir, JSON_CONFIG_FILE_NAME)).toString();
+        break;
+      } else if (startdir == '/') {
+        // Root dir, file not found
+        break;
+      } else {
+        startdir = path.normalize(path.join(startdir, '..'));
+      }
+    }
+
+    return {
+      ...DEFAULT_CONFIG,
+      ...JSON.parse(userConfigData),
+    } as JsonConfiguration;
+  } catch (e) {
+    console.error('ERROR: Failed reading LDD configuration file...');
+
+    process.exit(1);
+  }
+};
+
+export default findAndReadConfig();