package vaversion
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import (
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"encoding/json"
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"errors"
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"flag"
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"fmt"
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"math"
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"os"
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"strconv"
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"strings"
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)
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type (
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VaVersion int64
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)
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var (
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BuildVersion string
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BuildTime string
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CommitSha1 string
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AppName string
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ShowVer bool
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)
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func init() {
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flag.BoolVar(&ShowVer, "vbasic", false, "display build version")
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}
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func Usage() {
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if ShowVer {
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info := make(map[string]interface{})
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info["version"] = BuildVersion
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info["build"] = BuildTime
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info["commit"] = CommitSha1
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info["name"] = AppName
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b, err := json.Marshal(info)
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if nil != err {
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fmt.Println("internal error:", err)
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os.Exit(1)
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} else {
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fmt.Println(string(b))
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os.Exit(0)
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}
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}
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}
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func (v VaVersion) Valid() bool {
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if v < 0 {
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return false
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}
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majorVersion := v >> 32
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if majorVersion > math.MaxUint16 {
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return false
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}
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return true
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}
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func (v VaVersion) Compare(v1 VaVersion) (int, error) {
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if !v.Valid() {
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return 0, errors.New("Invalid VaVersion left value")
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}
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if !v1.Valid() {
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return 0, errors.New("Invalid VaVersion right value")
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}
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if v > v1 {
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return 1, nil
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}
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if v < v1 {
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return -1, nil
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}
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return 0, nil
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}
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func (v VaVersion) String() (string, error) {
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if !v.Valid() {
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return "", errors.New("Invalid VaVersion value")
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}
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majorVersion := (v >> 32) & 0xffff
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minorVersion := (v >> 16) & 0xffff
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buildNumber := v & 0xffff
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name := fmt.Sprintf("%d.%d.%d", majorVersion, minorVersion, buildNumber)
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return name, nil
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}
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func VersionName2VaVersion(version string) (VaVersion, error) {
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subVersions := strings.Split(version, ".")
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if len(subVersions) != 3 {
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return 0, errors.New("Incorrect version format, version formats like 1.12.3")
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}
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majorVersion, err := strconv.ParseInt(subVersions[0], 10, 64)
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if nil != err {
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return 0, errors.New(version + " major part can't be parsed, version formats like 1.12.3")
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}
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minorVersion, err := strconv.ParseInt(subVersions[1], 10, 64)
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if nil != err {
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return 0, errors.New(version + " minor part can't be parsed, version formats like 1.12.3")
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}
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buildNumber, err := strconv.ParseInt(subVersions[2], 10, 64)
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if nil != err {
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return 0, errors.New(version + " build number part can't be parsed, version formats like 1.12.3")
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}
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if majorVersion > math.MaxUint16 {
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return 0, errors.New(version + " major version too large, max value is:" + strconv.Itoa(math.MaxUint16))
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}
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if minorVersion > math.MaxUint16 {
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return 0, errors.New(version + " minor version too large, max value is:" + strconv.Itoa(math.MaxUint16))
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}
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if buildNumber > math.MaxUint16 {
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return 0, errors.New(version + " build number too large, max value is:" + strconv.Itoa(math.MaxUint16))
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}
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num := (majorVersion << 32) | (minorVersion << 16) | buildNumber
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return VaVersion(num), nil
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}
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