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version.go
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version.go
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package version
import (
"bytes"
"fmt"
"strings"
)
const (
// semanticAlphabet
semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
// These constants define the application version and follow the semantic
// versioning 2.0.0 spec (http://semver.org/).
AppMajor uint = 0
AppMinor uint = 1
AppPatch uint = 4
// appPreRelease MUST only contain characters from semanticAlphabet per
// the semantic versioning spec.
AppPreRelease = "beta"
)
// appBuild is defined as a variable so it can be overridden during the build
// process with '-ldflags "-X main.appBuild foo' if needed.
// It MUST only contain characters from semanticAlphabet per the semantic
// versioning spec.
var AppBuild string
// Version returns the application version as a properly formed string per
// the semantic versioning 2.0.0 spec (http://semver.org/).
func Version() string {
// Start with the major, minor, and patch versions.
version := fmt.Sprintf("%d.%d.%d", AppMajor, AppMinor, AppPatch)
// Append pre-release version if there is one.
// The hyphen called for by the semantic versioning spec is automatically
// appended and should not be contained in the pre-release string.
// The pre-release version is not appended if it contains invalid
// characters.
preRelease := NormalizeVerString(AppPreRelease)
if preRelease != "" {
version = fmt.Sprintf("%s-%s", version, preRelease)
}
// Append build metadata if there is any.
// The plus called for by the semantic versioning spec is automatically
// appended and should not be contained in the build metadata string.
// The build metadata string is not appended if it contains invalid
// characters.
build := NormalizeVerString(AppBuild)
if build != "" {
version = fmt.Sprintf("%s+%s", version, build)
}
return version
}
// NormalizeVerString returns the passed string stripped of all characters
// which are not valid according to the semantic versioning guidelines for
// pre-release version and build metadata strings.
// In particular they MUST only contain characters in semanticAlphabet.
func NormalizeVerString( str string) string {
var result bytes.Buffer
for _, r := range str {
if strings.ContainsRune(semanticAlphabet, r) {
result.WriteRune(r)
}
}
return result.String()
}