124 lines
2.5 KiB
Go
124 lines
2.5 KiB
Go
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// +build tools
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package main
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import (
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"bytes"
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"fmt"
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"go/format"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"text/template"
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"time"
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)
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var exactVer *regexp.Regexp
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var gitVer *regexp.Regexp
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var verFile = "generated-version.go"
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func init() {
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// exactly vX.Y.Z (go-compatible semver)
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exactVer = regexp.MustCompile(`^v\d+\.\d+\.\d+$`)
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// vX.Y.Z-n-g0000000 git post-release, semver prerelease
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gitVer = regexp.MustCompile(`^(v\d+\.\d+)\.(\d+)-(\d+)-g`)
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}
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// Goal: Either use an exact version like v1.0.0
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// or translate the git version like v1.0.0-4-g0000000
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// to a semver like v1.0.1-pre4+g0000000
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// Don't fail when git repo isn't available.
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func main() {
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desc := gitDesc()
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rev := gitRev()
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ver := semVer(desc)
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ts := time.Now().Format(time.RFC3339)
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v := struct {
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Timestamp string
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Version string
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GitRev string
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}{
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Timestamp: ts,
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Version: ver,
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GitRev: rev,
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}
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// Create or overwrite the go file from template
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var buf bytes.Buffer
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if err := versionTpl.Execute(&buf, v); nil != err {
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panic(err)
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}
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// Format
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src, err := format.Source(buf.Bytes())
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if nil != err {
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panic(err)
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}
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// Write to disk (in the Current Working Directory)
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f, err := os.Create(verFile)
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if nil != err {
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panic(err)
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}
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if _, err := f.Write(src); nil != err {
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panic(err)
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}
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if err := f.Close(); nil != err {
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panic(err)
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}
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}
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func gitDesc() string {
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args := strings.Split("git describe --tags --dirty --always", " ")
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cmd := exec.Command(args[0], args[1:]...)
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out, err := cmd.CombinedOutput()
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if nil != err {
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// Don't panic, just carry on
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out = []byte("v0.0.0-0-g0000000")
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}
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return strings.TrimSpace(string(out))
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}
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func gitRev() string {
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args := strings.Split("git rev-parse HEAD", " ")
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cmd := exec.Command(args[0], args[1:]...)
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out, err := cmd.CombinedOutput()
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if nil != err {
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// Don't panic, just carry on
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out = []byte("00000000000000000")
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}
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return strings.TrimSpace(string(out))
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}
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func semVer(desc string) string {
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var ver string
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if exactVer.MatchString(desc) {
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// v1.0.0
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ver = desc
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} else if gitVer.MatchString(desc) {
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// ((v1.0).(0)-(1))
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vers := gitVer.FindStringSubmatch(desc)
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patch, err := strconv.Atoi(vers[2])
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if nil != err {
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panic(err)
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}
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// v1.0.1-pre1
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ver = fmt.Sprintf("%s.%d-pre%s", vers[1], patch+1, vers[3])
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}
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return ver
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}
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var versionTpl = template.Must(template.New("").Parse(`// Code generated by go generate; DO NOT EDIT.
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package main
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func init() {
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Timestamp = "{{ .Timestamp }}"
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Version = "{{ .Version }}"
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GitRev = "{{ .GitRev }}"
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}
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`))
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