verb/lib/middleware/diff.js

Documentation generator for GitHub projects. Verb is extremely powerful, easy to use, and is used on hundreds of projects of all sizes to generate everything from API docs to readmes.

'use strict';

var chalk = require('chalk');
var relative = require('relative');

/**
 * Show a diff comparison of pre- and post-render content.
 */

module.exports = function(app) {
  return function (file, next) {
    var diff = app.get('argv.diff');

    if (!diff) return next();
    console.log();
    console.log('- end -');
    console.log('---------------------------------------------------------------');
    console.log(relative(file.path));
    console.log();

    if (file.content === '') {
      console.log(chalk.gray('  no content.'));
    } else if (file.content === file.orig) {
      console.log(chalk.gray('  content is unchanged.'));
    } else {
      app.diff(file.orig, file.content, 'diffLines');
    }
    next();
  };
};