Implement new structure

src/node/settings.ts

@@ -0,0 +1,40 @@
+import * as fs from "fs-extra"
+import { logger } from "@coder/logger"
+import { extend } from "./util"
+
+export type Settings = { [key: string]: Settings | string | boolean | number }
+
+/**
+ * Provides read and write access to settings.
+ */
+export class SettingsProvider<T> {
+  public constructor(private readonly settingsPath: string) {}
+
+  /**
+   * Read settings from the file. On a failure return last known settings and
+   * log a warning.
+   */
+  public async read(): Promise<T> {
+    try {
+      const raw = (await fs.readFile(this.settingsPath, "utf8")).trim()
+      return raw ? JSON.parse(raw) : {}
+    } catch (error) {
+      if (error.code !== "ENOENT") {
+        logger.warn(error.message)
+      }
+    }
+    return {} as T
+  }
+
+  /**
+   * Write settings combined with current settings. On failure log a warning.
+   * Objects will be merged and everything else will be replaced.
+   */
+  public async write(settings: Partial<T>): Promise<void> {
+    try {
+      await fs.writeFile(this.settingsPath, JSON.stringify(extend(this.read(), settings)))
+    } catch (error) {
+      logger.warn(error.message)
+    }
+  }
+}