https://github.com/busterc/lbl
:heavy_dollar_sign: Process stdin, line by line, sort of like AWK but 100% JS
https://github.com/busterc/lbl
awk byline cli console-log eval gawk grep javascript line-by-line line-reader lines print sed split stdin stdio
Last synced: 30 days ago
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:heavy_dollar_sign: Process stdin, line by line, sort of like AWK but 100% JS
- Host: GitHub
- URL: https://github.com/busterc/lbl
- Owner: busterc
- License: isc
- Created: 2018-07-02T16:19:17.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2018-08-25T22:01:34.000Z (over 6 years ago)
- Last Synced: 2025-03-06T11:46:01.840Z (about 2 months ago)
- Topics: awk, byline, cli, console-log, eval, gawk, grep, javascript, line-by-line, line-reader, lines, print, sed, split, stdin, stdio
- Language: JavaScript
- Size: 67.4 KB
- Stars: 2
- Watchers: 3
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# lbl [![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url]
> Process stdin, line by line, sort of like AWK but 100% JS
## Prerequisites
- There are a couple of handy globals available
- `$` is an alias for `global`
- `log` is an alias for `console.log`
- `chalk` is available for adding color to ouput
## Installation
```sh
$ npm install lbl --global
```
## Usage
```sh
Usage
$ lbl
Options
# Pass processing functions on CLI
-a, --after function to run after processing lines [optional]
-b, --before function to run before processing lines [optional]
-e, --each function to run on each line [required]
# Or, use a node module file with processing functions:
# before(), after(), each()
-r, --require module file with functions
-h, --help show this usage info
--version show the current version installed
Examples
$ cat ./data/x.file | lbl -r ./scripts/X.js
<>
> XX
> Matched 1 from 3
$ printf 'x\\nXX\\nxXx' | lbl -e 'x => { n++; if (x.match(/^X/)) { log(chalk.yellow('> ') + x); f++; } }' -b '() => { $.n = 0; $.f = 0; log('<>'); }' -a '() => { log('> Matched ' + f + ' from ' + n); }'
<>
> XX
> Matched 1 from 3
```
### Sample Module File
```js
'use strict';
/* global $, log, chalk, n:true, f:true */
module.exports = {
each: x => {
n++;
if (x.match(/^X/)) {
log(chalk.yellow('> ') + x);
f++;
}
},
before: () => {
$.n = 0;
$.f = 0;
log('<>');
},
after: () => {
log('> Matched ' + f + ' from ' + n);
}
};
```
## License
ISC © [Buster Collings]()
[npm-image]: https://badge.fury.io/js/lbl.svg
[npm-url]: https://npmjs.org/package/lbl
[travis-image]: https://travis-ci.org/busterc/lbl.svg?branch=master
[travis-url]: https://travis-ci.org/busterc/lbl
[daviddm-image]: https://david-dm.org/busterc/lbl.svg?theme=shields.io
[daviddm-url]: https://david-dm.org/busterc/lbl