1. #!/usr/bin/env node
  3. const readline = require('readline').createInterface({
  4. input: process.stdin,
  5. output: process.stdout,
  6. });
  7. const fs = require('fs');
  9. /**
  10. * Truncates log entries to a specified length.
  11. * @param {string} logData The log data to truncate.
  12. * @param {number} maxLength The maximum length of each log entry.
  13. * @returns {string} The truncated log data.
  14. */
  15. function truncateLog(logData, maxLength) {
  16. if (!logData) return ""; // Handle empty input
  17. return logData.length > maxLength ? logData.substring(0, maxLength) + "..." : logData;
  18. }
  21. /**
  22. * Reads log data from a file, truncates it, and writes the truncated data to a new file.
  23. */
  24. function processLogFile() {
  25. const inputFilePath = process.argv[2]; // Input file path from command line
  26. const maxLength = parseInt(process.argv[3], 10) || 100; // Max length, default to 100
  28. if (!inputFilePath) {
  29. console.error('Usage: truncate-log <input_file> <max_length>');
  30. readline.close();
  31. process.exit(1);
  32. }
  34. try {
  35. const fileContent = fs.readFileSync(inputFilePath, 'utf8');
  36. const truncatedContent = truncateLog(fileContent, maxLength);
  38. const outputFilePath = inputFilePath + '.truncated'; // Output file name
  39. fs.writeFileSync(outputFilePath, truncatedContent);
  40. console.log(`Truncated log data written to ${outputFilePath}`);
  41. } catch (error) {
  42. console.error('Error processing file:', error.message);
  43. readline.close();
  44. process.exit(1);
  45. }
  46. }
  49. readline.question('Enter the input log file path: ', (inputFilePath) => {
  50. readline.question('Enter the maximum log entry length (default: 100): ', (maxLengthStr) => {
  51. const maxLength = maxLengthStr ? parseInt(maxLengthStr, 10) : 100;
  52. processLogFile();
  53. readline.close();
  54. });
  55. });

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