272 lines
5.9 KiB
Markdown
272 lines
5.9 KiB
Markdown
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<!-- Please do not edit this file. Edit the `blah` field in the `package.json` instead. If in doubt, open an issue. -->
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# exec-limiter
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[![Support me on Patreon][badge_patreon]][patreon] [![Buy me a book][badge_amazon]][amazon] [![PayPal][badge_paypal_donate]][paypal-donations] [](https://github.com/IonicaBizau/ama) [](https://travis-ci.org/IonicaBizau/exec-limiter/) [](https://www.npmjs.com/package/exec-limiter) [](https://www.npmjs.com/package/exec-limiter) [](https://www.codementor.io/johnnyb?utm_source=github&utm_medium=button&utm_term=johnnyb&utm_campaign=github)
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<a href="https://www.buymeacoffee.com/H96WwChMy" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/yellow_img.png" alt="Buy Me A Coffee"></a>
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> Limit the shell execution commands to <x> calls same time.
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## :cloud: Installation
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```sh
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# Using npm
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npm install --save exec-limiter
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# Using yarn
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yarn add exec-limiter
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```
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:bulb: **ProTip**: You can install the [cli version of this module](https://github.com/IonicaBizau/exec-limiter-cli) by running `npm install --global exec-limiter-cli` (or `yarn global add exec-limiter-cli`).
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## :clipboard: Example
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```js
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// Dependencies
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var ExecLimiter = require("exec-limiter");
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// Constants
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const COMMAND = "sleep 5; date;";
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// Create an instance of exec limiter
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var el = new ExecLimiter(2);
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// #1
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el.add("sleep 5", function (err) {
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console.log(err || "Waited 5 seconds for the first time.");
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});
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// #2
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el.add("sleep", ["7"], function (err) {
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console.log(err || "Waited another 7 seconds but probably I was ran in parallel with the other process.");
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});
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// #3
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el.add("sleep 5", function (err) {
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console.log(err || "I was ran in parallel with the second process and finished fine.");
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});
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// #4
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el.add("ls", ["-l"], { ignoreStdout: false }, function (err, stdout) {
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console.log(err || "The spawned 'ls -l' returned:\n" + stdout);
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});
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// These will be executed like below:
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//
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// Timeline: 0-1-2-3-4-5-6-7-8-9-10-11
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//
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// #1: ==========
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// #2: ==============
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// #3: ============
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// #4: ==
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//
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// Notice how they run in parallel, but not more than 2 in the same time.
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```
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## :question: Get Help
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There are few ways to get help:
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1. Please [post questions on Stack Overflow](https://stackoverflow.com/questions/ask). You can open issues with questions, as long you add a link to your Stack Overflow question.
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2. For bug reports and feature requests, open issues. :bug:
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3. For direct and quick help, you can [use Codementor](https://www.codementor.io/johnnyb). :rocket:
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## :memo: Documentation
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### `ExecLimiter(limit)`
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Creates a new instance of `ExecLimiter`.
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#### Params
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- **Number** `limit`: The limit of commands to run same time.
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#### Return
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- **ExecLimiter** The `ExecLimiter` instance.
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### `add(command, args, options, callback)`
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Adds a new command to run in the buffer.
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Usage:
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```js
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el.add(command, fn); // exec
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el.add(command, args, fn); // spawn
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el.add(command, options, fn); // exec
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el.add(command, args, options, fn); // spawn
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```
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#### Params
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- **String** `command`: The command to run as string.
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- **Object** `args`: The command arguments as array of strings (optional).
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- **Object** `options`: The options passed to the spawn/exec function, but extended with the following fields:
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- `ignoreStdout` (Boolean): If `false`, then the stdout output will be stored ant called back.
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- **Function** `callback`: The callback function.
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#### Return
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- **ExecLimiter** The `ExecLimiter` instance.
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## :yum: How to contribute
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Have an idea? Found a bug? See [how to contribute][contributing].
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## :sparkling_heart: Support my projects
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I open-source almost everything I can, and I try to reply to everyone needing help using these projects. Obviously,
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this takes time. You can integrate and use these projects in your applications *for free*! You can even change the source code and redistribute (even resell it).
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However, if you get some profit from this or just want to encourage me to continue creating stuff, there are few ways you can do it:
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- Starring and sharing the projects you like :rocket:
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- [![Buy me a book][badge_amazon]][amazon]—I love books! I will remember you after years if you buy me one. :grin: :book:
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- [![PayPal][badge_paypal]][paypal-donations]—You can make one-time donations via PayPal. I'll probably buy a ~~coffee~~ tea. :tea:
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- [![Support me on Patreon][badge_patreon]][patreon]—Set up a recurring monthly donation and you will get interesting news about what I'm doing (things that I don't share with everyone).
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- **Bitcoin**—You can send me bitcoins at this address (or scanning the code below): `1P9BRsmazNQcuyTxEqveUsnf5CERdq35V6`
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Thanks! :heart:
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## :dizzy: Where is this library used?
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If you are using this library in one of your projects, add it in this list. :sparkles:
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- `gry`
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- `engine-tools`
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- `git-stat`
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- `exec-limiter-cli`
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- `npmreserve`
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- `@isysd/gpm`
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- `gpm`
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## :scroll: License
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[MIT][license] © [Ionică Bizău][website]
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[license]: /LICENSE
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[website]: https://ionicabizau.net
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[contributing]: /CONTRIBUTING.md
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[docs]: /DOCUMENTATION.md
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[badge_patreon]: https://ionicabizau.github.io/badges/patreon.svg
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[badge_amazon]: https://ionicabizau.github.io/badges/amazon.svg
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[badge_paypal]: https://ionicabizau.github.io/badges/paypal.svg
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[badge_paypal_donate]: https://ionicabizau.github.io/badges/paypal_donate.svg
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[patreon]: https://www.patreon.com/ionicabizau
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[amazon]: http://amzn.eu/hRo9sIZ
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[paypal-donations]: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RVXDDLKKLQRJW
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