feat: add version display supports.

README.md

@@ -48,6 +48,7 @@ $ dhttpd --help
     --host=<host>    The hostname to listen on.
                      (defaults to "localhost")
 -h, --help           Displays the help.
+    --version        Prints the version of dhttpd.
 ```
 
 [path]: https://dart.dev/tools/pub/cmd/pub-global#running-a-script-from-your-path

bin/dhttpd.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:dhttpd/dhttpd.dart';
 import 'package:dhttpd/src/options.dart';
+import 'package:dhttpd/src/version.dart';
 
 Future<void> main(List<String> args) async {
   Options options;
@@ -19,6 +20,11 @@ Future<void> main(List<String> args) async {
     return;
   }
 
+  if (options.version) {
+    print(packageVersion);
+    return;
+  }
+
   await Dhttpd.start(
     path: options.path,
     port: options.port,

lib/src/options.dart

@@ -31,10 +31,14 @@ class Options {
   @CliOption(abbr: 'h', negatable: false, help: 'Displays the help.')
   final bool help;
 
+  @CliOption(negatable: false, help: 'Prints the version of dhttpd.')
+  final bool version;
+
   Options({
     required this.port,
     this.path,
     required this.host,
     required this.help,
+    required this.version,
   });
 }

pubspec.yaml

@@ -17,6 +17,7 @@ dev_dependencies:
   build_cli: ^2.0.2
   build_runner: ^2.0.0
   build_verify: '>=2.0.0 <4.0.0'
+  build_version: ^2.1.1
   lints: ^1.0.0
   path: ^1.6.1
   test: ^1.3.0

test/readme_test.dart

@@ -29,6 +29,7 @@ $ dhttpd --help
     --host=<host>    The hostname to listen on.
                      (defaults to "localhost")
 -h, --help           Displays the help.
+    --version        Prints the version of dhttpd.
 ```''');
 
   expect(readme.readAsStringSync(), contains(expected));