flython 0.2.0

Use Flython to combine the power of Python with Dart. It was originally created to be used with Flutter but, it doesn't depend on Flutter and can be used in pure Dart code.

example/main.dart

import 'package:flython/flython.dart';

class OpenCV extends Flython {
  static const cmdToGray = 1;

  Future<dynamic> toGray(
    String inputFile,
    String outputFile,
  ) async {
    var command = {
      "cmd": cmdToGray,
      "input": inputFile,
      "output": outputFile,
    };
    return await runCommand(command);
  }
}

void main() async {
  final opencv = OpenCV();
  await opencv.initialize("python", "./example/opencv.py", false);
  await opencv.toGray("./image.png", "./image_gray.png");
  opencv.finalize();
}

// For the record, here are the contents of ./example/opencv.py, since it doesn't show up in the official package Example page on pub.dev (at least at the time of publishing this package)
/*
import argparse
import json
import sys

import cv2

CMD_SYS_VERSION = 0
CMD_TO_GRAY = 1


def run(command):
    if command["cmd"] == CMD_SYS_VERSION:
        return {
            "sys.version": sys.version,
        }

    if command["cmd"] == CMD_TO_GRAY:
        image = cv2.imread(command["input"])
        gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
        cv2.imwrite(command["output"], gray)
        return {}

    else:
        return {"error": "Unknown command."}


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--uuid")
    args = parser.parse_args()
    stream_start = f"`S`T`R`E`A`M`{args.uuid}`S`T`A`R`T`"
    stream_end = f"`S`T`R`E`A`M`{args.uuid}`E`N`D`"
    while True:
        cmd = input()
        cmd = json.loads(cmd)
        try:
            result = run(cmd)
        except Exception as e:
            result = {"exception": e.__str__()}
        result = json.dumps(result)
        print(stream_start + result + stream_end)
 */