sheller 0.4.0-dev2

Ergonomic utilities for interacting with shells and converting output. Useful for writing Dart scripts.

sheller

Ergonomic utilities for interacting with shells and converting output. Useful for writing Dart scripts.

List<File> files = await $("cd $outputDir && dart pub run index_generator && find . -maxdepth 1 -type f").lines();

Table of Contents

1. Examples
2. Valid Conversion Types
3. Custom Conversion Types
4. Real Use Case - Protobuf Package Generation Script Example

Examples

// Linux
void main() async {
  // int
  int number = await $("echo 1")();
  assert(number == 1);
  // json
  String data ='{\\"id\\":1, \\"name\\":\\"lorem ipsum\\", \\"address\\":\\"dolor set amet\\"}';
  Map<String, dynamic> json = await $('echo $data')();
  assert(json.entries.length == 3);
  // List<double>
  List<double> doubleList = await $('echo 1 2 3').spaces();
  assert(doubleList.length == 3);
  // Class version
  $ shellClass = $("echo 1");
  int id = await shellClass.pid;
  int convertedResult = await shellClass(); // == 1
}

Valid Conversion Types

int
double
num
BigInt
String
bool
Map<String, dynamic>
Object
FileSystemEntity
Directory
File
Link

As well as their List variants.

Custom Conversion Types

class IntConverter extends Converter<String, int> {
  const IntConverter();

  @override
  int convert(String input) {
    int? result = int.tryParse(input);
    if (result == null) {
      throw ShellResultConversionException(int, input);
    }
    return result;
  }
}

ShellConversionConfig.add(const IntConverter());

Real Use Case - Protobuf Package Generation Script Example

Future<void> main() async {
  String osPathSeparator = path.separator;
  assert(Directory.current.path.split(osPathSeparator).last == "lib");
  var protoFilesDir = "../../../proto";
  var outputDir = "../../generated";
  var outputSrcDir = "../../generated/lib/src";
  Directory(outputDir).deleteSync(recursive: true);
  Directory(outputSrcDir).createSync(recursive: true);

  var protoFiles = Directory(protoFilesDir)
      .listSync()
      .whereType<File>()
      .where((file) => file.path.endsWith(".proto"))
      .map((file) => file.path)
      .toList();

  var command = "protoc -I=$protoFilesDir --dart_out=grpc:$outputSrcDir ${protoFiles.join(' ')} google/protobuf/empty.proto";
  print(await $(command)());

  var toCopyOver = "../to_copy_over";
  Directory(toCopyOver).copyToSync(Directory(outputDir));

  final generateBarrelFileCommand = "cd $outputDir && dart pub run index_generator";
  print(await $(generateBarrelFileCommand)());
}