old_contents: 'use strict';
  
  const os = require('os');
  const fs = require('fs');
  const process = require('process');
  const readline = require('readline');
  const run = require('comandante');
  
  function plotStream(stream, options) {
    // Read the options
    const dataNum = options.dataNum || null;
    const usesSplot = options.usesSplot || false;
    const gnuplotOptions = options.gnuplotOptions || [];
    const plotOptions = options.plotOptions || "";
    const initializeScript = options.initializeScript || "";
    const finalizeScript = options.finalizeScript || "";
  
    const tmpfile = `${os.tmpdir()}/gnuplot-streaming.${process.pid}`
  
    const plotCommand = (usesSplot) ? "splot" : "plot";
  
    const data = [];
  
    // Run gnuplot command
    const gnuplot = run('gnuplot', gnuplotOptions);
    // Initialize gnuplot
    gnuplot.write(`${initializeScript}\n`);
    // Open a window
    gnuplot.write(`${plotCommand} '${tmpfile}' ${plotOptions}\n`);
  
    const reader = readline.createInterface({
      input: stream,
      output: null,
      terminal: false
    });
    reader.on('line', (line) => {
      if (dataNum == null || dataNum <= 0) {
        fs.appendFileSync(tmpfile, `${line}\n`);
      } else {
        // Remove the previous data
        data.push(line);
        while (data.length > dataNum) {
          data.shift(); // Remove the oldest line
        }
        fs.writeFileSync(tmpfile, data.join('\n'));
      }
      // Update the plot
      gnuplot.write(`${plotCommand} '${tmpfile}' ${plotOptions}\n`);
    });
    reader.on('close', () => {
      // Finalize gnuplot
      gnuplot.write(`${finalizeScript}\nquit\n`);
      fs.unlinkSync(tmpfile);
    });
  }
  
  module.exports = {
    plotStream: plotStream,
    plotFile(filename, options) {
      plotStream(fs.createReadStream(filename), options);
    },
    plotStdin(usesSplot, options) {
      plotStream(process.stdin, options);
    }
  }
  
new_contents: 'use strict';
  
  const os = require('os');
  const fs = require('fs');
  const process = require('process');
  const readline = require('readline');
  const run = require('comandante');
  
  function plotStream(stream, options) {
    // Read the options
    const dataNum = options.dataNum || null;
    const usesSplot = options.usesSplot || false;
    const gnuplotOptions = options.gnuplotOptions || [];
    const plotOptions = options.plotOptions || "";
    const initializeScript = options.initializeScript || "";
    const finalizeScript = options.finalizeScript || "";
  
    const tmpfile = `${os.tmpdir()}/gnuplot-streaming.${process.pid}`
  
    const plotCommand = (usesSplot) ? "splot" : "plot";
  
    const data = [];
  
    // Run gnuplot command
    const gnuplot = run('gnuplot', gnuplotOptions);
    // Initialize gnuplot
    gnuplot.write(`${initializeScript}\n`);
    // Open a window
    gnuplot.write(`${plotCommand} '${tmpfile}' ${plotOptions}\n`);
  
    const reader = readline.createInterface({
      input: stream,
      output: null,
      terminal: false
    });
    reader.on('line', (line) => {
      if (dataNum == null || dataNum <= 0) {
        fs.appendFileSync(tmpfile, `${line}\n`);
      } else {
        // Remove the previous data
        data.push(line);
        while (data.length > dataNum) {
          data.shift(); // Remove the oldest line
        }
        fs.writeFileSync(tmpfile, data.join('\n'));
      }
      // Update the plot
      gnuplot.write(`${plotCommand} '${tmpfile}' ${plotOptions}\n`);
    });
    reader.on('close', () => {
      // Finalize gnuplot
      gnuplot.write(`${finalizeScript}\nquit\n`);
      fs.unlinkSync(tmpfile);
    });
  }
  
  module.exports = {
    plotStream: plotStream,
    plotFile(filename, options) {
      plotStream(fs.createReadStream(filename), options);
    },
    plotStdin(options) {
      plotStream(process.stdin, options);
    }
  }
  
subject: Fix the bug of plotStdin's arguments