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// run as 'go run ./version/gen/vgen.go'
package main
import (
"fmt"
"log"
"os/exec"
"strings"
"github.com/Masterminds/semver/v3"
)
func main() {
descVer, err := describedVersion()
if err != nil {
log.Fatal(err)
}
latest, err := latestTag()
if err != nil {
log.Fatal(err)
}
ver := version(descVer, latest)
fmt.Println(ver.String())
}
func describedVersion() (*semver.Version, error) {
desc, err := runCmd("git describe --always")
if err != nil {
return nil, fmt.Errorf("git describe failed: %w", err)
}
ver, err := semver.NewVersion(desc)
if err != nil {
return nil, err
}
return ver, nil
}
func version(descVer, latest *semver.Version) *semver.Version {
ver := *descVer
if ver.Prerelease() != "" {
ver = ver.IncPatch().IncPatch()
ver, _ = ver.SetPrerelease(descVer.Prerelease())
ver, _ = ver.SetMetadata(descVer.Metadata())
} else if ver.Metadata() != "" {
ver = ver.IncPatch()
ver, _ = ver.SetMetadata(descVer.Metadata())
}
// if we're on a release tag already, we're done
if descVer.Equal(&ver) {
return descVer
}
// If 'latest' is greater than 'ver', we need to skip to the next patch.
// If 'latest' is already a prerelease (i.e. if v5.0.0-pre was tagged),
// we should use
// If 'latest' is a prerelease, it's the same logic, except that we don't
// want to increment the patch version.
if latest.GreaterThan(&ver) || latest.Prerelease() != "" {
v := *latest
if v.Prerelease() == "" {
v = v.IncPatch()
}
v, _ = v.SetPrerelease(ver.Prerelease())
v, _ = v.SetMetadata(ver.Metadata())
ver = v
}
return &ver
}
func latestTag() (*semver.Version, error) {
// get the latest tag
tags, err := runCmd("git tag --list v*")
if err != nil {
return nil, fmt.Errorf("git tag failed: %w", err)
}
// find the latest tag
var latest *semver.Version
for tag := range strings.SplitSeq(tags, "\n") {
ver, err := semver.NewVersion(tag)
if err != nil {
return nil, fmt.Errorf("parsing tag %q failed: %w", tag, err)
}
if latest == nil || ver.GreaterThan(latest) {
latest = ver
}
}
if latest == nil {
return nil, fmt.Errorf("no tags found")
}
return latest, nil
}
func runCmd(c string) (string, error) {
parts := strings.Split(c, " ")
//nolint:gosec
cmd := exec.Command(parts[0], parts[1:]...)
out, err := cmd.CombinedOutput()
return strings.TrimSpace(string(out)), err
}
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