Refactor file structure, update how commands run

Since the tool is only React Native for now, it didn't seem necessary to
have the 'react-native' directory. Moved to 'src'.

Also created utility for importing commands for commander

bin/belt

@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-yarn ts-node ./react-native/react-native.ts "$@"
+yarn ts-node ./src/cli.ts "$@"

src/cli.ts

@@ -0,0 +1,25 @@
+import { program } from "commander";
+import buildAction from "./util/buildAction";
+
+console.log("React Native 🎉");
+
+export default function runCli() {
+  program
+    .name("thoughtbelt")
+    .description(
+      "Perform React Native and Expo setup and redundant tasks without your pants falling down!"
+    )
+
+    .command("eslint")
+    .description("Configure ESLint")
+    .action(buildAction(import("./commands/eslint")));
+
+  program
+    .command("prettier")
+    .description("Configure Prettier")
+    .action(buildAction(import("./commands/prettier")));
+
+  program.showHelpAfterError().parse();
+}
+
+runCli();

src/commands/eslint.ts

@@ -0,0 +1,3 @@
+export default function runEslint() {
+  console.log("ESLint!");
+}

src/commands/prettier.ts

@@ -0,0 +1,3 @@
+export default function runPrettier() {
+  console.log("Prettier!");
+}

src/util/buildAction.ts

@@ -0,0 +1,17 @@
+type AsyncModule = Promise<{
+  default: (...args: unknown[]) => void;
+}>;
+
+/**
+ * builds the action function that is passed to Commander's
+ * program.action.
+ * Eg: program.action(
+ *   buildAction(import('./commands/prettier))
+ * )
+ */
+export default function buildAction(asyncModule: AsyncModule) {
+  return async (...args: unknown[]) => {
+    const module = await asyncModule;
+    module.default(args);
+  };
+}