pyscript.js

const pyscript = (() => {
	const process = require("process");
	const { spawnSync, spawn } = require("child_process");
	const { platform } = require("os");
    let python_intp = "";
    const os = platform();
    if (os == "win32") {
        let python_1 = spawnSync("where.exe", ["python"]).stdout.toString();
        let python_2 = spawnSync("where.exe", ["python3"]).stdout.toString();
        python_intp = python_1 != "" ? python_1 : python_2;
    } else if (os == "linux" || os == "darwin") {
        let python_1 = spawnSync("which", ["python"]).stdout.toString();
        let python_2 = spawnSync("which", ["python3"]).stdout.toString();
        python_intp = python_1 != "" ? python_1 : python_2;
    }
    if (python_intp.endsWith("\r\n")) {
        python_intp = python_intp.substring(python_intp.length - 2, -1);
    } else if (python_intp.endsWith("\n")) {
        python_intp = python_intp.substring(python_intp.length - 1, -1);
    }
    if (python_intp === "") {
        console.error("Error: No valid python installation found");
        process.exit(1);
    }
    return (
        script,
        { pipe, sync, on } = { pipe: true, sync: true, on: undefined }
    ) => {
        if (pipe === undefined) {
            pipe = true;
        }
        if (sync === undefined) {
            sync = true;
        }
        let python = sync
            ? (() => {
                  return spawnSync(python_intp.replace(/\r\n/g, ""), [script], {
                      cwd: process.cwd(),
                      stdio: pipe
                          ? "pipe"
                          : [process.stdin, process.stdout, process.stderr],
                  });
              })()
            : (() => {
                  return spawn(python_intp.replace(/\r\n/g, ""), [script], {
                      cwd: process.cwd(),
                      stdio: pipe
                          ? "pipe"
                          : [process.stdin, process.stdout, process.stderr],
                  });
              })();
        return sync
            ? pipe
                ? python.stderr.toString() != ""
                    ? [1, python.stderr.toString()]
                    : [0, python.stdout.toString()]
                : undefined
            : new Promise(async (res, rej) => {
                  python.stdin.setEncoding("utf-8");
                  let stdout = [];
                  let stderr = [];
                  if (Array.isArray(on) && typeof on[0] == "function") {
                      on[0]({
                          write: (data) => {
                              python.stdin.cork();
                              python.stdin.write(data);
                              python.stdin.end();
                              python.stdin.uncork();
                          },
                      });
                  }
                  python.stdout.on("data", (data) => {
                      stdout.push(data.toString());
                      if (Array.isArray(on) && typeof on[1] == "function") {
                          on[1]({
                              data: data.toString(),
                              write: (data) => {
                                  python.stdin.cork();
                                  python.stdin.write(data);
                                  python.stdin.end();
                                  python.stdin.uncork();
                              },
                          });
                      }
                  });
                  python.stderr.on("data", (data) => {
                      stderr.push(data.toString());
                      if (Array.isArray(on) && typeof on[2] == "function") {
                          on[2]({
                              data: data.toString(),
                              write: (data) => {
                                  python.stdin.cork();
                                  python.stdin.write(data);
                                  python.stdin.end();
                                  python.stdin.uncork();
                              },
                          });
                      }
                  });
                  python.on("close", (code) => {
                      res({ code, stderr, stdout });
                  });
              });
    };
})();