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editing: README.md

[![Latest Stable Version](https://poser.pugx.org/sebastian/version/v/stable.png)](https://packagist.org/packages/sebastian/version)

# sebastian/version

**sebastian/version** is a library that helps with managing the version number of Git-hosted PHP projects.

## Installation

You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):

```
composer require sebastian/version
```

If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:

```
composer require --dev sebastian/version
```
## Usage

The constructor of the `SebastianBergmann\Version` class expects two parameters:

* `$release` is the version number of the latest release (`X.Y.Z`, for instance) or the name of the release series (`X.Y`) when no release has been made from that branch / for that release series yet.
* `$path` is the path to the directory (or a subdirectory thereof) where the sourcecode of the project can be found. Simply passing `__DIR__` here usually suffices.

Apart from the constructor, the `SebastianBergmann\Version` class has a single public method: `asString()`.

Here is a contrived example that shows the basic usage:

```php
<?php declare(strict_types=1);
use SebastianBergmann\Version;

$version = new Version('1.0.0', __DIR__);

var_dump($version->asString());
```
```
string(18) "1.0.0-17-g00f3408"
```

When a new release is prepared, the string that is passed to the constructor as the first argument needs to be updated.

### How SebastianBergmann\Version::asString() works

* If `$path` is not (part of) a Git repository and `$release` is in `X.Y.Z` format then `$release` is returned as-is.
* If `$path` is not (part of) a Git repository and `$release` is in `X.Y` format then `$release` is returned suffixed with `-dev`.
* If `$path` is (part of) a Git repository and `$release` is in `X.Y.Z` format then the output of `git describe --tags` is returned as-is.
* If `$path` is (part of) a Git repository and `$release` is in `X.Y` format then a string is returned that begins with `X.Y` and ends with information from `git describe --tags`.

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