Introduction to dir-compare

Directory comparison is a crucial task for developers who work with file systems, particularly for version control, backup synchronization, and file auditing. dir-compare is a powerful tool in Node.js that facilitates this process by offering a plethora of useful APIs to compare directories and analyze differences efficiently.

Basic Usage

To get started with dir-compare, you can install it using npm:

 npm install dir-compare 

API Examples

Let’s dive into the various APIs offered by dir-compare:

Compare Two Directories

 const dircompare = require('dir-compare'); const options = { compareContent: true }; const res = dircompare.compareSync('path/to/dir1', 'path/to/dir2', options);
console.log(res.same); // Outputs: true or false console.log('Differences: ', res.diffSet); 

Compare Asynchronously

 const dircompare = require('dir-compare'); const options = { compareContent: true };
dircompare.compare('path/to/dir1', 'path/to/dir2', options)
  .then(res => {
    console.log(res.same); // true or false
    console.log('Differences: ', res.diffSet);
  });

Customize Options

 const options = {
  compareContent: true,
  excludeFilter: 'node_modules, *.log',
  includeFilter: '*.js, *.json',
};
const res = dircompare.compareSync('path/to/dir1', 'path/to/dir2', options); console.log('Differences: ', res.diffSet); 

Detailed Difference Output

 const options = { compareContent: true }; const res = dircompare.compareSync('path/to/dir1', 'path/to/dir2', options);
res.diffSet.forEach(dif => {
  console.log('State: ', dif.state);
  console.log('Name1: ', dif.name1);
  console.log('Name2: ', dif.name2);
}); 

Sample Application

Here is an example of a simple Node.js application that uses the dir-compare library to compare two directories and print the results in a readable format:

 const dircompare = require('dir-compare');
const options = { compareContent: true }; const dir1 = 'path/to/dir1'; const dir2 = 'path/to/dir2';
async function compareDirectories() {
  try {
    const res = await dircompare.compare(dir1, dir2, options);

    if (res.same) {
      console.log('Directories are identical.');
    } else {
      console.log('Differences found:');
      res.diffSet.forEach(dif => {
        console.log(\`File: \${dif.name1 || 'N/A'} <-> \${dif.name2 || 'N/A'} - State: \${dif.state}\`);
      });
    }
  } catch (error) {
    console.error('Error comparing directories:', error);
  }
}
compareDirectories(); 

Using dir-compare, developers can create robust scripts and tools to handle directory comparison tasks efficiently, ensuring data consistency and aiding in file management workflows.

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