func Parse(gitversion string) (semver.Version, error) {
// optionally trim leading spaces then one v
var seen bool
gitversion = strings.TrimLeftFunc(gitversion, func(ch rune) bool {
if seen {
return false
}
if ch == 'v' {
seen = true
return true
}
return unicode.IsSpace(ch)
})
return semver.Make(gitversion)
}
func main() {
v, err := semver.Parse("0.0.1-alpha.preview.222+123.github")
if err != nil {
fmt.Printf("Error while parsing (not valid): %q", err)
}
fmt.Printf("Version to string: %q\n", v)
fmt.Printf("Major: %d\n", v.Major)
fmt.Printf("Minor: %d\n", v.Minor)
fmt.Printf("Patch: %d\n", v.Patch)
// Prerelease versions
if len(v.Pre) > 0 {
fmt.Println("Prerelease versions:")
for i, pre := range v.Pre {
fmt.Printf("%d: %q\n", i, pre)
}
}
// Build meta data
if len(v.Build) > 0 {
fmt.Println("Build meta data:")
for i, build := range v.Build {
fmt.Printf("%d: %q\n", i, build)
}
}
// Make == Parse (Value), New for Pointer
v001, err := semver.Make("0.0.1")
fmt.Println("\nUse Version.Compare for comparisons (-1, 0, 1):")
fmt.Printf("%q is greater than %q: Compare == %d\n", v001, v, v001.Compare(v))
fmt.Printf("%q is less than %q: Compare == %d\n", v, v001, v.Compare(v001))
fmt.Printf("%q is equal to %q: Compare == %d\n", v, v, v.Compare(v))
fmt.Println("\nUse comparison helpers returning booleans:")
fmt.Printf("%q is greater than %q: %t\n", v001, v, v001.GT(v))
fmt.Printf("%q is greater than equal %q: %t\n", v001, v, v001.GTE(v))
fmt.Printf("%q is greater than equal %q: %t\n", v, v, v.GTE(v))
fmt.Printf("%q is less than %q: %t\n", v, v001, v.LT(v001))
fmt.Printf("%q is less than equal %q: %t\n", v, v001, v.LTE(v001))
fmt.Printf("%q is less than equal %q: %t\n", v, v, v.LTE(v))
fmt.Println("\nManipulate Version in place:")
v.Pre[0], err = semver.NewPRVersion("beta")
if err != nil {
fmt.Printf("Error parsing pre release version: %q", err)
}
fmt.Printf("Version to string: %q\n", v)
fmt.Println("\nCompare Prerelease versions:")
pre1, _ := semver.NewPRVersion("123")
pre2, _ := semver.NewPRVersion("alpha")
pre3, _ := semver.NewPRVersion("124")
fmt.Printf("%q is less than %q: Compare == %d\n", pre1, pre2, pre1.Compare(pre2))
fmt.Printf("%q is greater than %q: Compare == %d\n", pre3, pre1, pre3.Compare(pre1))
fmt.Printf("%q is equal to %q: Compare == %d\n", pre1, pre1, pre1.Compare(pre1))
fmt.Println("\nValidate versions:")
v.Build[0] = "?"
err = v.Validate()
if err != nil {
fmt.Printf("Validation failed: %s\n", err)
}
fmt.Println("Create valid build meta data:")
b1, _ := semver.NewBuildVersion("build123")
v.Build[0] = b1
fmt.Printf("Version with new build version %q\n", v)
_, err = semver.NewBuildVersion("build?123")
if err != nil {
fmt.Printf("Create build version failed: %s\n", err)
}
}