first version of cli downloader done

Author: Hamid313-coder

.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

bin/downloader.dart

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+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:dio/dio.dart';
+import 'package:validators/validators.dart';
+
+void main(List<String> args) async {
+  try {
+    final argParser = buildParser();
+
+    final results = argParser.parse(args);
+    if (results.wasParsed('help')) {
+      printUsage(argParser);
+      return;
+    }
+
+    if (args.length > 1) {
+      throw 'Just one argument is allowed';
+    }
+    if (args.isEmpty) {
+      printUsage(argParser);
+      return;
+    }
+
+    if (!isURL(results.arguments.first)) {
+      throw 'Not a valid URL';
+    }
+    final filePath = await download(results.arguments.first);
+
+    print('\nFile downloaded to "$filePath"');
+  } catch (e) {
+    print(e.toString());
+  }
+}
+
+ArgParser buildParser() {
+  return ArgParser()
+    ..addFlag(
+      'help',
+      abbr: 'h',
+      negatable: false,
+    );
+}
+
+void printUsage(ArgParser argParser) {
+  print('Usage: downld [URL]');
+  print(argParser.usage);
+}
+
+Future<String> download(String url) async {
+  try {
+    final dio = Dio();
+
+    final directory = getDownloadsDirectory();
+
+    final savePath = '${directory.path}\\${Uri.parse(url).pathSegments.last}';
+
+    final response = await dio.download(
+      url,
+      savePath,
+      onReceiveProgress: (received, total) {
+        final progress = (received / total * 100).toInt();
+        showProgress(progress);
+      },
+    );
+
+    final contentType =
+        (response.headers.map['content-type'] as List)[0] as String;
+
+    final extion = contentType.split('/').last;
+
+    final newSavePath = renameIfNoExtenion(savePath, extion);
+
+    if (newSavePath != null) return newSavePath;
+
+    return savePath;
+  } catch (e) {
+    rethrow;
+  }
+}
+
+Directory getDownloadsDirectory() {
+  final userProfile = Platform.environment['USERPROFILE'];
+  if (userProfile != null) {
+    final downloadsDirectory = '$userProfile\\Downloads';
+    final dir = Directory(downloadsDirectory);
+    dir.createSync(recursive: true);
+    return dir;
+  }
+  return Directory.current;
+}
+
+void showProgress(int progress) {
+  try {
+    assert(
+        progress >= 0 && progress <= 100, 'Progress must be between 0 and 100');
+    const int total = 100;
+    const int barLength = 40;
+
+    if (progress > total) progress = total;
+
+    // Calculate the number of "=" signs based on progress
+    int filledLength = (barLength * progress) ~/ total;
+    String bar = '=' * filledLength + ' ' * (barLength - filledLength);
+
+    stdout.write('\r[$bar] $progress%');
+  } catch (e) {
+    rethrow;
+  }
+}
+
+String? renameIfNoExtenion(String filePath, String extenion) {
+  final fileName = filePath.split('\\').last;
+
+  if (fileName.contains('.')) return null;
+
+  final file = File(filePath);
+  var path = file.path;
+  var lastSeparator = path.lastIndexOf(Platform.pathSeparator);
+  var newPath = '${path.substring(0, lastSeparator + 1)}$fileName.$extenion';
+  return file.renameSync(newPath).path;
+}