What is this?

Easy way to read file lines async and efficiently on two directions: from the beginning to the end and from the end to the beginning.

Installing

npm install --save read-lines-riched

Run tests

npm test

Highlights of functionality

• readLines(file_path[,options]) - Return instance of readLineRiched configured with options to read file lines.

  • options Object (Optional)
    • bChunk Integer - Size in bytes of how many bytes are readed from file at the same time. Default is 1024.
    • dir Integer - 1 read lines from beginning to the end. -1 read lines from the end to the beginning. Default is 1.

• readLinesStartToEnd(file_path) - Return instance of readLineRiched that read from the beginning of the file to the end reading chunks of 1kb.

• readLinesEndToStart(file_path) - Return instance of readLineRiched that read from the end of the file to the beginning reading chunks of 1kb.

• readLineRiched.readNextLine() - Read next line of file based on given configuration.

Usage

Reading from beginning to end using Promise

const readLinesEndToStart = require("read-lines-riched").readLinesEndToStart(file_path);

var func = function () {
    readLinesEndToStart.readNextLine().then(line => {
        if (line) {
            console.log(line);
            func()
        } else
            readLinesEndToStart.closeReader();
    });
};
func();

Reading from end to beginning using Async

const readLinesStartToEnd = require("read-lines-riched").readLinesStartToEnd(file_path);

(async function () {
    var line;
    while (line = await readLinesStartToEnd.readNextLine()) {
        console.log(line);
    }
    readLinesStartToEnd.closeReader();
})();

Reading from end to beginning on chunks of 4kb.

const readLinesRiched = require("read-lines-riched").readLines(file_path, {
        bChunk: 1024 * 4,
        dir: -1
    });

(async function () {
    var line;
    while (line = await readLinesRiched.readNextLine()) {
        console.log(line);
    }
    readLinesRiched.closeReader();
})();

Changelog

All notable changes to this project can be seen here.

Contributing

1. Fork it on Github https://github.com/Puzzle9900/read-lines-riched
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

License

This project is licensed under the MIT License - see the LICENSE.md file for details

Copyright (c) 2018 Puzzle9900