semverly is a Ruby gem for parsing and comparing version strings that comply with the Semantic Versioning 2.0.0 specification.

The .parse class method parses a SemVer-compliant version string into its component parts.

require 'semverly'

irb> semver = SemVer.parse('1.2.3-alpha+gitsha.abc1123')
=> #<SemVer:0x007f9e8b88f898 @major=1, @minor=2, @patch=3, @prerelease="alpha", @metadata="gitsha.abc1123">
irb> semver.major
=> 1
irb> semver.minor
=> 2
irb> semver.patch
=> 3
irb> semver.prerelease
=> "alpha"
irb> semver.metadata
=> "gitsha.abc1123"

A leading “v” prefix is optional.

irb> SemVer.parse('v1.0')
=> #<SemVer:0x007f9e8b8c75b8 @major=1, @minor=0, @patch=0, @prerelease=nil, @metadata=nil>

Strings that are not SemVer-compliant return nil.

irb> SemVer.parse('v1.0a')
=> nil

You can also build SemVer instances with .new.

irb> SemVer.new(1, 2, 3, 'beta.1', 'gitsha.abc123')
=> #<SemVer:0x007f9e8b854e78 @major=1, @minor=2, @patch=3, @prerelease="beta.1", @metadata="gitsha.abc123">

#to_s gives you back a String representation of the version.

irb> semver = SemVer.new(1, 2, 3, 'beta.1', 'gitsha.abc123')
=> #<SemVer:0x007f9e8b8e0400 @major=1, @minor=2, @patch=3, @prerelease="beta.1", @metadata="gitsha.abc123">
irb> semver.to_s
=> "1.2.3-beta.1+gitsha.abc123"

Sorting works as expected.

irb> %w(1.0.0-alpha 1.0.0-alpha.1 1.0.0-alpha.beta 1.0.0-beta 1.0.0-beta.2 1.0.0-beta.11 1.0.0-rc.1 1.0.0).shuffle.map { |s| SemVer.parse(s) }.sort.map(&:to_s)
=> ["1.0.0-alpha", "1.0.0-alpha.1", "1.0.0-alpha.beta", "1.0.0-beta", "1.0.0-beta.2", "1.0.0-beta.11", "1.0.0-rc.1", "1.0.0"]

1. Fork it.

2. Create a topic branch for your feature or bug fix.

3. Commit your changes, including new/updated tests.

4. Create a pull request.

Semverly is released under the MIT license.