1. /**
  2. * Gracefully handles text file maintenance tasks with input validation.
  3. *
  4. * @param {string} filePath - The path to the text file.
  5. * @param {function} taskFunction - The function to execute on the file content.
  6. * @returns {Promise<void>} - A promise that resolves when the task is complete or rejects on error.
  7. */
  8. async function processTextFile(filePath, taskFunction) {
  9. try {
  10. // Check if the file exists
  11. try {
  12. await fs.access(filePath, fs.constants.F_OK); // Check if file exists
  13. } catch (err) {
  14. throw new Error(`File not found: ${filePath}`);
  15. }
  17. // Read the file content
  18. const fileContent = await fs.readFile(filePath, 'utf8');
  20. // Basic input validation: Check if the file content is not empty
  21. if (!fileContent.trim()) {
  22. throw new Error('File content is empty.');
  23. }
  25. // Execute the task function with the file content
  26. await taskFunction(fileContent);
  28. } catch (error) {
  29. console.error(`Error processing file ${filePath}: ${error.message}`);
  30. throw error; // Re-throw the error to allow the caller to handle it.
  31. }
  32. }
  34. // Example usage (assuming you have 'fs' module available - e.g., from Node.js)
  35. // npm install fs
  36. const fs = require('fs');
  38. /**
  39. * Example task function: Convert text to uppercase
  40. * @param {string} text - The text to convert.
  41. * @returns {string} - The uppercase version of the text.
  42. */
  43. async function convertToUppercase(text) {
  44. console.log("Converting text to uppercase...");
  45. const uppercaseText = text.toUpperCase();
  46. console.log("Uppercase conversion complete.");
  47. return uppercaseText;
  48. }
  51. // Example call
  52. async function main() {
  53. try {
  54. await processTextFile('maintenance.txt', convertToUppercase);
  55. console.log('File processing successful.');
  56. } catch (error) {
  57. console.error('File processing failed.');
  58. }
  59. }
  61. //Create a dummy maintenance.txt for testing
  62. fs.writeFileSync('maintenance.txt', 'This is a test file.');
  63. main();

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