# Versionaire
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Provides immutable, thread-safe, semantic versioning.
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## Table of Contents
- [Features](#features)
- [Screencasts](#screencasts)
- [Requirements](#requirements)
- [Setup](#setup)
- [Usage](#usage)
- [Initialization](#initialization)
- [Equality](#equality)
- [Value (`#==`)](#value-)
- [Hash (`#eql?`)](#hash-eql)
- [Case (`#===`)](#case-)
- [Identity (`#equal?`)](#identity-equal)
- [Conversions](#conversions)
- [Function (Casting)](#function-casting)
- [Implicit](#implicit)
- [Explicit](#explicit)
- [Math](#math)
- [Addition](#addition)
- [Subtraction](#subtraction)
- [Tests](#tests)
- [Versioning](#versioning)
- [Code of Conduct](#code-of-conduct)
- [Contributions](#contributions)
- [License](#license)
- [History](#history)
- [Credits](#credits)
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## Features
- Provides [Semantic Versioning](http://semver.org).
- Provides immutable, thread-safe version instances.
- Provides conversions (casts) from a `String`, `Array`, `Hash`, or `Version` to a `Version`.
## Screencasts
[](https://asciinema.org/a/40455)
## Requirements
0. [Ruby 2.5.x](https://www.ruby-lang.org)
## Setup
Type the following to install:
gem install versionaire
Add the following to your Gemfile:
gem "versionaire"
## Usage
### Initialization
A new version can be initialized in a variety of ways:
Versionaire::Version.new # "0.0.0"
Versionaire::Version.new major: 1 # "1.0.0"
Versionaire::Version.new major: 1, minor: 2 # "1.2.0"
Versionaire::Version.new major: 1, minor: 2, maintenance: 3 # "1.2.3"
### Equality
#### Value (`#==`)
Equality is deterimined by the state of the object. This means that a version is equal to another
version as long as all of the values (i.e. state) are equal to each other. Example:
version_a = Versionaire::Version.new major: 1
version_b = Versionaire::Version.new major: 2
version_c = Versionaire::Version.new major: 1
version_a == version_a # true
version_a == version_b # false
version_a == version_c # true
Knowning this, versions can be compared against one another too:
version_a > version_b # false
version_a < version_b # true
version_a.between? version_c, version_b # true
#### Hash (`#eql?`)
Behaves exactly as `#==`.
#### Case (`#===`)
Behaves exactly as `#==`.
#### Identity (`#equal?`)
Works like any other standard Ruby object where an object is equal only to itself.
version_a = Versionaire::Version.new major: 1
version_b = Versionaire::Version.new major: 2
version_c = Versionaire::Version.new major: 1
version_a.equal? version_a # true
version_a.equal? version_b # false
version_a.equal? version_c # false
### Conversions
#### Function (Casting)
The `Versionaire::Version` function is provided for explicit casting to a version:
version = Versionaire::Version.new major: 1
Versionaire::Version "1.0.0"
Versionaire::Version [1, 0, 0]
Versionaire::Version major: 1, minor: 0, maintenance: 0
Versionaire::Version version
Each of these conversions will result in a version object that represents "1.0.0". When attempting
to convert an unsupported type, a `Versionaire::Errors::Conversion` exception will be thrown.
#### Implicit
Implicit conversion to a `String` is supported:
"1.0.0".match Versionaire::Version.new(major: 1) # <MatchData "1.0.0">
#### Explicit
Explicit conversion to a `String`, `Array`, or `Hash` is supported:
version = Versionaire::Version.new
version.to_s # "0.0.0"
version.to_a # [0, 0, 0]
version.to_h # {major: 0, minor: 0, maintenance: 0}
### Math
Versions can be added and subtracted from each other.
#### Addition
version_1 = Versionaire::Version.new major: 1, minor: 2, maintenance: 3
version_2 = Versionaire::Version.new major: 2, minor: 5, maintenance: 7
version_1 + version_2 # "3.7.10"
#### Subtraction
version_1 = Versionaire::Version.new major: 1, minor: 2, maintenance: 3
version_2 = Versionaire::Version.new major: 1, minor: 1, maintenance: 1
version_1 - version_2 # "0.1.2"
version_1 = Versionaire::Version.new major: 1
version_2 = Versionaire::Version.new major: 5
version_1 - version_2 # Fails with a Versionaire::Errors::NegativeNumber
## Tests
To test, run:
bundle exec rake
## Versioning
Read [Semantic Versioning](http://semver.org) for details. Briefly, it means:
- Major (X.y.z) - Incremented for any backwards incompatible public API changes.
- Minor (x.Y.z) - Incremented for new, backwards compatible, public API enhancements/fixes.
- Patch (x.y.Z) - Incremented for small, backwards compatible, bug fixes.
## Code of Conduct
Please note that this project is released with a [CODE OF CONDUCT](CODE_OF_CONDUCT.md). By
participating in this project you agree to abide by its terms.
## Contributions
Read [CONTRIBUTING](CONTRIBUTING.md) for details.
## License
Copyright (c) 2016 [Alchemists](https://www.alchemists.io).
Read [LICENSE](LICENSE.md) for details.
## History
Read [CHANGES](CHANGES.md) for details.
Built with [Gemsmith](https://github.com/bkuhlmann/gemsmith).
## Credits
Developed by [Brooke Kuhlmann](https://www.alchemists.io) at
[Alchemists](https://www.alchemists.io).