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28 lines
732 B
JavaScript
28 lines
732 B
JavaScript
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'use strict';
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var eventStream = require('event-stream');
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var fsExtra = require('fs-extra');
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var Promise = require('bluebird');
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module.exports = readLines;
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/**
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* Read a file line-by-line.
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*
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* @param {String} path Path to the file.
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* @param {Function} callback Function to call when reading each line.
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* @returns {Promise} A promise when the reader is finished.
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*
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* @private
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*/
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function readLines(path, callback) {
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return new Promise(function(resolve, reject) {
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fsExtra.createReadStream(path)
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.on('error', reject)
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.on('end', resolve)
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.pipe(eventStream.split())
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.pipe(eventStream.mapSync(function (line) {
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callback(line);
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}));
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});
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}
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