mirror of https://github.com/docker/cli.git
66 lines
1.7 KiB
Markdown
66 lines
1.7 KiB
Markdown
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# Versioning Library for Go
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[](https://travis-ci.org/hashicorp/go-version)
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go-version is a library for parsing versions and version constraints,
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and verifying versions against a set of constraints. go-version
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can sort a collection of versions properly, handles prerelease/beta
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versions, can increment versions, etc.
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Versions used with go-version must follow [SemVer](http://semver.org/).
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## Installation and Usage
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Package documentation can be found on
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[GoDoc](http://godoc.org/github.com/hashicorp/go-version).
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Installation can be done with a normal `go get`:
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```
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$ go get github.com/hashicorp/go-version
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```
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#### Version Parsing and Comparison
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```go
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v1, err := version.NewVersion("1.2")
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v2, err := version.NewVersion("1.5+metadata")
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// Comparison example. There is also GreaterThan, Equal, and just
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// a simple Compare that returns an int allowing easy >=, <=, etc.
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if v1.LessThan(v2) {
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fmt.Printf("%s is less than %s", v1, v2)
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}
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```
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#### Version Constraints
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```go
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v1, err := version.NewVersion("1.2")
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// Constraints example.
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constraints, err := version.NewConstraint(">= 1.0, < 1.4")
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if constraints.Check(v1) {
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fmt.Printf("%s satisfies constraints %s", v1, constraints)
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}
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```
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#### Version Sorting
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```go
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versionsRaw := []string{"1.1", "0.7.1", "1.4-beta", "1.4", "2"}
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versions := make([]*version.Version, len(versionsRaw))
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for i, raw := range versionsRaw {
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v, _ := version.NewVersion(raw)
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versions[i] = v
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}
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// After this, the versions are properly sorted
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sort.Sort(version.Collection(versions))
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```
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## Issues and Contributing
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If you find an issue with this library, please report an issue. If you'd
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like, we welcome any contributions. Fork this library and submit a pull
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request.
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