Create jazip

.gitignore

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+# Files and directories created by pub
+.dart_tool/
+.packages
+
+# Conventional directory for build outputs
+build/
+
+# Directory created by dartdoc
+doc/api/
+
+.DS_Store

Makefile

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+VERSION=0.1.0
+
+default:
+	cat ./Makefile
+
+.PHONY: build
+build:
+	mkdir -p build/jazip-${VERSION}
+	dart2native bin/main.dart -o build/jazip-${VERSION}/jazip
+	tar -zcvf build/jazip-${VERSION}.tar.gz build/jazip-${VERSION}

README.md

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+# JaZip
+郵便番号から住所を検索するCLIツール。
+
+``` sh
+$ jazip 2790031
+千葉県,浦安市,舞浜
+```
+
+### Created by stagehand
+Created from templates made available by Stagehand under a BSD-style
+[license](https://github.com/dart-lang/stagehand/blob/master/LICENSE).

analysis_options.yaml

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+# Defines a default set of lint rules enforced for
+# projects at Google. For details and rationale,
+# see https://github.com/dart-lang/pedantic#enabled-lints.
+include: package:pedantic/analysis_options.yaml
+
+# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
+# Uncomment to specify additional rules.
+# linter:
+#   rules:
+#     - camel_case_types
+
+analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

bin/main.dart

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+// import 'package:jazip/jazip.dart' as jazip;
+import 'dart:io';
+import 'dart:async';
+import 'dart:convert';
+import 'package:path/path.dart' as path;
+import 'package:args/args.dart';
+
+final argParser = ArgParser();
+final CSV_DATA_FILE_NAME = 'KEN_ALL_ROME.CSV';
+
+void main(List<String> arguments) {
+  final argResults = argParser.parse(arguments);
+  if (argResults.rest.isEmpty) {
+    exit(1);
+  }
+
+  final postcode = argResults.rest.first;
+  getAddressCSVFile().then((csvFile) => runCommand(csvFile, postcode));
+}
+
+void runCommand(File csvFile, String postcode) {
+  Stream fileReader = csvFile.openRead();
+  fileReader
+    .transform(utf8.decoder)
+    .transform(LineSplitter())
+    .listen(
+    (String line) {
+      var values = line.split(',');
+      if (values.first.contains(postcode)) {
+        var output = '${values[1]},${values[2]},${values[3]}'.replaceAll('"', '').replaceAll('　', '');
+        stdout.writeln(output);
+        exit(0);
+      }
+    },
+    onDone: () => exit(1)
+  );
+}
+
+String getHomePath() {
+  String home;
+  final envVars = Platform.environment;
+  if (Platform.isMacOS) {
+    home = envVars['HOME'];
+  } else if (Platform.isLinux) {
+    home = envVars['HOME'];
+  } else if (Platform.isWindows) {
+    home = envVars['UserProfile'];
+  }
+
+  return home;
+}
+
+Directory configureCacheDirectory() {
+  final cacheDir = Directory(path.fromUri('${getHomePath()}/.jazip'));
+  if (!cacheDir.existsSync()) {
+    cacheDir.createSync();
+  }
+  return cacheDir;
+}
+
+Future<File> getAddressCSVFile() async {
+  final cacheDir = configureCacheDirectory();
+  final csvPath = path.join(cacheDir.path, CSV_DATA_FILE_NAME);
+  final csvFile = File(csvPath);
+  if (!csvFile.existsSync()) {
+    return fetchAddressData(csvFile);
+  }
+
+  var completer = Completer<File>();
+  completer.complete(csvFile);
+  return completer.future;
+}
+
+Future<File> fetchAddressData(File file) async {
+  final url = 'https://raw.githubusercontent.com/kra8/jazip/master/data/${CSV_DATA_FILE_NAME}';
+  var httpClient = HttpClient();
+  var request = await httpClient.getUrl(Uri.parse(url));
+  var response = await request.close();
+  await response.pipe(file.openWrite());
+  return file;
+}

lib/jazip.dart

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+int calculate() {
+  return 6 * 7;
+}