go-gitver/gitver/gitver.go

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package gitver
import (
"fmt"
"os/exec"
"regexp"
"strconv"
"strings"
"time"
)
var exactVer *regexp.Regexp
var gitVer *regexp.Regexp
func init() {
// exactly vX.Y.Z (go-compatible semver)
exactVer = regexp.MustCompile(`^v\d+\.\d+\.\d+$`)
// vX.Y.Z-n-g0000000 git post-release, semver prerelease
// vX.Y.Z-dirty git post-release, semver prerelease
gitVer = regexp.MustCompile(`^(v\d+\.\d+)\.(\d+)(-(\d+))?(-(g[0-9a-f]+))?(-(dirty))?`)
}
// Versions describes the various version properties
type Versions struct {
Timestamp time.Time
Version string
Rev string
}
// ExecAndParse will run git and parse the output
func ExecAndParse() (*Versions, error) {
desc, err := gitDesc()
if nil != err {
return nil, err
}
rev, err := gitRev()
if nil != err {
return nil, err
}
ver, err := semVer(desc)
if nil != err {
return nil, err
}
ts, err := gitTimestamp(desc)
if nil != err {
ts = time.Now()
}
return &Versions{
Timestamp: ts,
Version: ver,
Rev: rev,
}, nil
}
func gitDesc() (string, error) {
args := strings.Split("git describe --tags --dirty --always", " ")
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if nil != err {
// Don't panic, just carry on
//out = []byte("0.0.0-0-g0000000")
return "", err
}
return strings.TrimSpace(string(out)), nil
}
func gitRev() (string, error) {
args := strings.Split("git rev-parse HEAD", " ")
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if nil != err {
return "", fmt.Errorf("\nUnexpected Error\n\n"+
"Please open an issue at https://git.rootprojects.org/root/go-gitver/issues/new \n"+
"Please include the following:\n\n"+
"Command: %s\n"+
"Output: %s\n"+
"Error: %s\n"+
"\nPlease and Thank You.\n\n", strings.Join(args, " "), out, err)
}
return strings.TrimSpace(string(out)), nil
}
func semVer(desc string) (string, error) {
if exactVer.MatchString(desc) {
// v1.0.0
return strings.TrimPrefix(desc, "v"), nil
}
if !gitVer.MatchString(desc) {
return "", nil
}
// (v1.0).(0)(-(1))(-(g0000000))(-(dirty))
vers := gitVer.FindStringSubmatch(desc)
patch, err := strconv.Atoi(vers[2])
if nil != err {
return "", fmt.Errorf("\nUnexpected Error\n\n"+
"Please open an issue at https://git.rootprojects.org/root/go-gitver/issues/new \n"+
"Please include the following:\n\n"+
"git description: %s\n"+
"RegExp: %#v\n"+
"Error: %s\n"+
"\nPlease and Thank You.\n\n", desc, gitVer, err)
}
// v1.0.1-pre1
// v1.0.1-pre1+g0000000
// v1.0.1-pre0+dirty
// v1.0.1-pre0+g0000000-dirty
if "" == vers[4] {
vers[4] = "0"
}
ver := fmt.Sprintf("%s.%d-pre%s", vers[1], patch+1, vers[4])
if "" != vers[6] || "dirty" == vers[8] {
ver += "+"
if "" != vers[6] {
ver += vers[6]
if "" != vers[8] {
ver += "-"
}
}
ver += vers[8]
}
return strings.TrimPrefix(ver, "v"), nil
}
func gitTimestamp(desc string) (time.Time, error) {
// Other options:
//
// Commit Date
// git log -1 --format=%cd --date=format:%Y-%m-%dT%H:%M:%SZ%z
//
// Author Date
// git log -1 --format=%ad --date=format:%Y-%m-%dT%H:%M:%SZ%z
//
// I think I chose this because it would account for dirty-ness better... maybe?
args := []string{
"git",
"show", desc,
"--format=%cd",
"--date=format:%Y-%m-%dT%H:%M:%SZ%z",
"--no-patch",
}
cmd := exec.Command(args[0], args[1:]...)
out, err := cmd.CombinedOutput()
if nil != err {
// a dirty desc was probably used
return time.Time{}, err
}
return time.Parse(time.RFC3339, strings.TrimSpace(string(out)))
}