Can save the updated root config

src/commands/add-endpoint.ts

@@ -125,7 +125,7 @@ Adds an endpoint to ~/.fauna-shell.
       secret,
       url,
     });
-    // config.saveRootConfig();
+    config.saveRootConfig();
 
     this.log(`Saved endpoint ${endpointName} to ${getRootConfigPath()}`);
   }

src/lib/config/index.ts

@@ -282,6 +282,13 @@ export class ShellConfig {
     this.projectConfig?.save(this.projectConfigFile()!);
   }
 
+  /**
+   * Saves the root config.
+   */
+  saveRootConfig() {
+    this.rootConfig.save(getRootConfigPath());
+  }
+
   projectConfigFile(): string | undefined {
     return this.projectPath === undefined
       ? undefined

src/lib/config/root-config.ts

@@ -1,4 +1,6 @@
 import { Config, InvalidConfigError } from ".";
+import fs from "fs";
+const ini = require("ini");
 
 // Represents `~/.fauna-shell`
 export class RootConfig {
@@ -26,6 +28,24 @@ export class RootConfig {
       );
     }
   }
+
+  save(path: string) {
+    const config = this.toIni();
+
+    const encoded = ini.encode(config);
+    fs.writeFileSync(path, encoded);
+  }
+
+  toIni() {
+    return {
+      ...(this.defaultEndpoint !== undefined
+        ? { default: this.defaultEndpoint }
+        : {}),
+      endpoint: Object.fromEntries(
+        Object.entries(this.endpoints).map(([k, v]) => [k, v.toIni()])
+      ),
+    };
+  }
 }
 
 /**
@@ -134,4 +154,16 @@ export class Endpoint {
       return opts.url;
     }
   };
+
+  toIni() {
+    return {
+      secret: this.secret,
+      ...(this.url != "https://db.fauna.com" ? { url: this.url } : {}),
+
+      ...(this.graphqlHost != "graphql.fauna.com"
+        ? { graphqlHost: this.graphqlHost }
+        : {}),
+      ...(this.graphqlPort != 443 ? { graphqlPort: this.graphqlPort } : {}),
+    };
+  }
 }