Improve CLI output

documentation/docs/detailed-techniques.md

@@ -46,7 +46,7 @@ message SomeData { ... }
 This applies same to marked Protobuf messages.
 
 ```proto title="Protobuf"
-// [RINF:DART-SIGNAL]
+// [DART-SIGNAL]
 // This is an audio data sample of...
 // contains...
 // responsible for...

documentation/docs/frequently-asked-questions.md

@@ -188,13 +188,13 @@ However, if you really need to store some state in a Flutter widget, you can ach
 syntax = "proto3";
 package tutorial_resource;
 
-// [RINF:DART-SIGNAL]
+// [DART-SIGNAL]
 message MyUniqueInput {
   int32 interaction_id = 1;
   int32 before_number = 2;
 }
 
-// [RINF:RUST-SIGNAL]
+// [RUST-SIGNAL]
 message MyUniqueOutput {
   int32 interaction_id = 1;
   int32 after_number = 2;

documentation/docs/messaging.md

@@ -4,10 +4,10 @@ There are special comments that you can mark messages with.
 
 ## 📢 Channels
 
-`[RINF:RUST-SIGNAL]` generates a message channel from Rust to Dart.
+`[RUST-SIGNAL]` generates a message channel from Rust to Dart.
 
 ```proto title="Protobuf"
-// [RINF:RUST-SIGNAL]
+// [RUST-SIGNAL]
 message MyDataOutput { ... }
 ```
 
@@ -29,10 +29,10 @@ StreamBuilder(
 )
 ```
 
-Use `[RINF:RUST-SIGNAL-BINARY]` to include binary data without the overhead of serialization.
+Use `[RUST-SIGNAL-BINARY]` to include binary data without the overhead of serialization.
 
 ```proto title="Protobuf"
-// [RINF:RUST-SIGNAL-BINARY]
+// [RUST-SIGNAL-BINARY]
 message MyDataOutput { ... }
 ```
 
@@ -56,10 +56,10 @@ StreamBuilder(
 )
 ```
 
-`[RINF:DART-SIGNAL]` generates a message channel from Dart to Rust.
+`[DART-SIGNAL]` generates a message channel from Dart to Rust.
 
 ```proto title="Protobuf"
-// [RINF:DART-SIGNAL]
+// [DART-SIGNAL]
 message MyDataInput { ... }
 ```
 
@@ -75,10 +75,10 @@ while let Some(dart_signal) = receiver.recv().await {
 }
 ```
 
-Use `[RINF:DART-SIGNAL-BINARY]` to include binary data without the overhead of serialization.
+Use `[DART-SIGNAL-BINARY]` to include binary data without the overhead of serialization.
 
 ```proto title="Protobuf"
-// [RINF:DART-SIGNAL-BINARY]
+// [DART-SIGNAL-BINARY]
 message MyDataInput { ... }
 ```
 
@@ -98,9 +98,9 @@ while let Some(dart_signal) = receiver.recv().await {
 
 ## 🔖 Attributes
 
-`[RINF:RUST-ATTRIBUTE(...)]` writes an attribute above the generated message struct in Rust. This is useful when you want to automatically implement a trait for the message struct in Rust.
+`[RUST-ATTRIBUTE(...)]` writes an attribute above the generated message struct in Rust. This is useful when you want to automatically implement a trait for the message struct in Rust.
 
 ```proto title="Protobuf"
-// [RINF:RUST-ATTRIBUTE(#[derive(Hash)])]
+// [RUST-ATTRIBUTE(#[derive(Hash)])]
 message MyDataInput { ... }
 ```

documentation/docs/tutorial.md

@@ -15,13 +15,13 @@ child: Column(
 
 Let's say that you want to create a new button in Dart that sends an array of numbers and a string to Rust. We need a signal to notify Rust that a user event has occurred.
 
-Write a new `.proto` file in the `./messages` directory with a new message. Note that the message should have the comment `[RINF:DART-SIGNAL]` above it.
+Write a new `.proto` file in the `./messages` directory with a new message. Note that the message should have the comment `[DART-SIGNAL]` above it.
 
 ```proto title="messages/tutorial_messages.proto"
 syntax = "proto3";
 package tutorial_messages;
 
-// [RINF:DART-SIGNAL]
+// [DART-SIGNAL]
 message MyPreciousData {
   repeated int32 input_numbers = 1;
   string input_string = 2;
@@ -99,13 +99,13 @@ flutter: ZERO-COST ABSTRACTION
 
 Let's say that you want to send increasing numbers every second from Rust to Dart.
 
-Define the message. Note that the message should have the comment `[RINF:RUST-SIGNAL]` above it.
+Define the message. Note that the message should have the comment `[RUST-SIGNAL]` above it.
 
 ```proto title="messages/tutorial_messages.proto"
 syntax = "proto3";
 package tutorial_messages;
 
-// [RINF:RUST-SIGNAL]
+// [RUST-SIGNAL]
 message MyAmazingNumber { int32 current_number = 1; }
 ```
 
@@ -172,10 +172,10 @@ You can easily show the updated state on the screen by combining those two ways
 syntax = "proto3";
 package tutorial_messages;
 
-// [RINF:DART-SIGNAL]
+// [DART-SIGNAL]
 message MyTreasureInput {}
 
-// [RINF:RUST-SIGNAL]
+// [RUST-SIGNAL]
 message MyTreasureOutput { int32 current_value = 1; }
 ```
 

flutter_package/bin/rinf.dart

@@ -1,55 +1,111 @@
+import 'package:args/command_runner.dart';
+import 'package:chalkdart/chalkstrings.dart';
+
 import 'src/config.dart';
 import 'src/helpers.dart';
 import 'src/message.dart';
 import 'src/internet.dart';
+import 'src/common.dart';
 
 Future<void> main(List<String> args) async {
-  if (args.isEmpty) {
-    print('No operation is provided.');
-    print('Use `rinf --help` to see all available operations.');
-    return;
-  }
+  // After running `dart run rinf`,
+  // Unnecessary two lines of
+  //`Building package executable...\nBuilt rinf:rinf.` appear.
+  // Remove those before proceeding.
+  removeCliLines(2);
 
-  final rinfConfig = await loadVerifiedRinfConfig('pubspec.yaml');
+  // Check the internet connection status and rembember it.
   await checkConnectivity();
 
-  switch (args[0]) {
-    case 'config':
-      print(rinfConfig);
-      break;
-    case 'template':
-      await applyRustTemplate(messageConfig: rinfConfig.message);
-      break;
-    case 'message':
-      if (args.contains('--watch') || args.contains('-w')) {
-        await watchAndGenerateMessageCode(messageConfig: rinfConfig.message);
-      } else {
-        await generateMessageCode(messageConfig: rinfConfig.message);
-      }
-      break;
-    case 'wasm':
-      if (args.contains('--release') || args.contains('-r')) {
-        await buildWebassembly(isReleaseMode: true);
-      } else {
-        await buildWebassembly();
-      }
-      break;
-    case '--help':
-    case '-h':
-      print('Usage: rinf [arguments]');
-      print('Arguments:');
-      print('  -h, --help        Shows this usage information.');
-      print('  config            Shows current Rinf configuration'
-          '\n                    resolved from `pubspec.yaml`'
-          '\n                    with defaults applied.');
-      print('  template          Applies Rust template'
-          '\n                    to current Flutter project.');
-      print('  message           Generates message code from `.proto` files.');
-      print('    -w, --watch     Continuously watches `.proto` files.');
-      print('  wasm              Builds webassembly module.');
-      print('    -r, --release   Builds in release mode.');
-    default:
-      print('No such operation is available.');
-      print('Use `rinf --help` to see all available operations.');
+  // Parse CLI arguments and run the corresponding function.
+  final runner = CommandRunner(
+    'rinf',
+    'Helper commands for building apps with Rust in Flutter.',
+    usageLineLength: 80,
+  )
+    ..addCommand(ConfigCommand())
+    ..addCommand(TemplateCommand())
+    ..addCommand(MessageCommand())
+    ..addCommand(WasmCommand());
+
+  try {
+    await runner.run(args);
+  } catch (error) {
+    // Print the error gracefully without backtrace.
+    print(error.toString().trim().red);
+  }
+}
+
+class ConfigCommand extends Command {
+  final name = 'config';
+  final description = 'Shows current Rinf configuration' +
+      ' resolved from `pubspec.yaml` with defaults applied.';
+
+  ConfigCommand() {}
+
+  Future<void> run() async {
+    final rinfConfig = await loadVerifiedRinfConfig('pubspec.yaml');
+    print(rinfConfig.toString().dim);
+  }
+}
+
+class TemplateCommand extends Command {
+  final name = 'template';
+  final description = 'Applies Rust template to the current Flutter project.';
+
+  TemplateCommand() {}
+
+  Future<void> run() async {
+    final rinfConfig = await loadVerifiedRinfConfig('pubspec.yaml');
+    await applyRustTemplate(messageConfig: rinfConfig.message);
+  }
+}
+
+class MessageCommand extends Command {
+  final name = 'message';
+  final description = 'Generates message code from `.proto` files.';
+
+  MessageCommand() {
+    argParser.addFlag(
+      'watch',
+      abbr: 'w',
+      help: 'Continuously watches `.proto` files.',
+    );
+  }
+
+  Future<void> run() async {
+    final results = argResults;
+    if (results == null) {
+      return;
+    }
+    final watch = results.flag('watch');
+    final rinfConfig = await loadVerifiedRinfConfig('pubspec.yaml');
+    if (watch) {
+      await watchAndGenerateMessageCode(messageConfig: rinfConfig.message);
+    } else {
+      await generateMessageCode(messageConfig: rinfConfig.message);
+    }
+  }
+}
+
+class WasmCommand extends Command {
+  final name = 'wasm';
+  final description = 'Builds the webassembly module for the web.';
+
+  WasmCommand() {
+    argParser.addFlag(
+      'release',
+      abbr: 'r',
+      help: 'Builds in release mode.',
+    );
+  }
+
+  Future<void> run() async {
+    final results = argResults;
+    if (results == null) {
+      return;
+    }
+    final release = results.flag('release');
+    await buildWebassembly(release);
   }
 }

flutter_package/bin/src/common.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 extension UriJoin on Uri {
   Uri join(String path) {
     if (path.isEmpty || path == '/') {
@@ -12,3 +14,12 @@ extension UriJoin on Uri {
     }
   }
 }
+
+/// Removes an existing line from the CLI.
+void removeCliLines(int lines) {
+  for (var i = 0; i < lines; i++) {
+    stdout.write('\x1B[1A'); // Move the cursor up one line
+    stdout.write('\x1B[2K'); // Clear the line
+    stdout.write('\r'); // Return the cursor to the front
+  }
+}

flutter_package/bin/src/config.dart

@@ -1,4 +1,5 @@
 import 'dart:io';
+
 import 'package:yaml/yaml.dart';
 
 class RinfConfigMessage {