feat: allow optionally fixing template output

brick/brick.yaml

@@ -45,3 +45,9 @@ vars:
     description: Whether the generated package is intended to be published.
     default: false
     prompt: Will the package be published?
+  dart_fix_output:
+    type: boolean
+    description: >-
+      Whether or not the generated Dart output files should be fixed and formatted.
+    default: false
+    prompt: Should the generated output fix and format Dart files?

brick/hooks/post_gen.dart

@@ -0,0 +1,87 @@
+import 'dart:io';
+
+import 'package:mason/mason.dart';
+import 'package:meta/meta.dart';
+import 'package:very_good_flutter_plugin_hooks/src/cli/cli.dart';
+
+/// The key for the `dartFixOutput` context variable.
+@visibleForTesting
+const dartFixOutputVariableKey = 'dartFixOutput';
+
+Future<void> run(
+  HookContext context, {
+  @visibleForTesting VeryGoodCli veryGoodCli = VeryGoodCli.instance,
+  @visibleForTesting DartCli dartCli = DartCli.instance,
+}) async {
+  final dartFixOutput = context.vars.containsKey(dartFixOutputVariableKey) &&
+      context.vars[dartFixOutputVariableKey] as bool;
+  if (dartFixOutput) {
+    await _dartFixOutput(
+      logger: context.logger,
+      workingDirectory: Directory.current.path,
+      veryGoodCli: veryGoodCli,
+      dartCli: dartCli,
+    );
+  }
+}
+
+/// Attempts to `dart` fix and format the output.
+///
+/// Since the template includes Dart files with templated variables, generating
+/// the template can cause the generated Dart files to be invalid. For example,
+/// if the user inputs a long enough package name, the generated Dart files may
+/// exceed the 80 character line limit enforced by the the Dart formatter.
+/// Running `dart fix` and `dart format` on the generated output ensures that
+/// the generated output is always valid.
+///
+/// Before we can run `dart fix` and `dart format`, we need to ensure that the
+/// dependencies are installed. Doing so allows getting remote analysis options
+/// and allows the Dart code to resolve the imports.
+///
+/// If the [DartCli] or [VeryGoodCli] is not installed, this function will log
+/// a warning and return immediately.
+Future<void> _dartFixOutput({
+  required Logger logger,
+  required String workingDirectory,
+  required VeryGoodCli veryGoodCli,
+  required DartCli dartCli,
+}) async {
+  if (!await dartCli.isInstalled(logger: logger)) {
+    logger.warn(
+      '''Could not fix output because Dart CLI is not installed.''',
+    );
+    return;
+  }
+  if (!await veryGoodCli.isInstalled(logger: logger)) {
+    logger.warn(
+      '''Could not fix output because Very Good CLI is not installed.''',
+    );
+    return;
+  }
+
+  try {
+    await veryGoodCli.packagesGet(
+      logger: logger,
+      recursive: true,
+      cwd: workingDirectory,
+    );
+    await dartCli.fix(
+      logger: logger,
+      apply: true,
+      cwd: workingDirectory,
+    );
+    await dartCli.format(
+      logger: logger,
+      cwd: workingDirectory,
+    );
+  } on ProcessException catch (e) {
+    logger.err(
+      '''
+Running process ${e.executable} with ${e.arguments} failed:
+${e.message}
+''',
+    );
+  } catch (e) {
+    logger.err('Unknown error occurred when fixing output: $e');
+  }
+}

brick/hooks/test/cli/dart_cli_test.dart

@@ -3,7 +3,7 @@ import 'dart:io';
 import 'package:mason/mason.dart';
 import 'package:mocktail/mocktail.dart';
 import 'package:test/test.dart';
-import 'package:very_good_start_hooks/cli/cli.dart';
+import 'package:very_good_flutter_plugin_hooks/src/cli/cli.dart';
 
 class _TestProcess {
   Future<ProcessResult> run(