package version import ( "fmt" ) // Version is a structured representation of a version number type Version struct { Major int Minor int Patch int Extension string Text string } // Compare this version (a) with another version (b). // This function returns -1 if a is less than b, 1 if a is greater than b, or 0 if a is equal to b. // // Extensions such as pre-release version or build metadata are ignored when comparing versions. func (a *Version) Compare(b *Version) int { if a.Major == b.Major { if a.Minor == b.Minor { if a.Patch == b.Patch { return 0 } else if a.Patch > b.Patch { return 1 } } else if a.Minor > b.Minor { return 1 } } else if a.Major > b.Major { return 1 } return -1 } // Less performs a simple comparison of this version (a) with another version (b). // This function returns true if a is less than b, or false otherwise. // // Extensions such as pre-release version or build metadata are ignored when comparing versions. func (a *Version) Less(b *Version) bool { return a.Compare(b) < 0 } // SemanticString returns a version string conforming to the standard described in Semantic Versioning 2.0.0. // // See https://semver.org/#is-v123-a-semantic-version func (v *Version) SemanticString() string { return fmt.Sprintf("%d.%d.%d%s", v.Major, v.Minor, v.Patch, v.Extension) } func (v *Version) String() string { if v.Text != "" { return v.Text } return v.SemanticString() }