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legacy.go
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/
legacy.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 = 2
AppPatch uint = 2
// 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()
}