File size: 3,493 Bytes
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import (
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"sync"
)
// BuildVersion can be injected at build time via -ldflags.
// In release builds it should come from Git tag (e.g. v2.3.5).
var BuildVersion = ""
var (
currentOnce sync.Once
currentVal string
sourceVal string
)
func Current() (value string, source string) {
currentOnce.Do(func() {
if build := strings.TrimSpace(BuildVersion); build != "" {
currentVal = normalize(build)
sourceVal = "build-ldflags"
return
}
if fv := readVersionFile(); fv != "" {
currentVal = normalize(fv)
sourceVal = "file:VERSION"
return
}
if vv := versionFromVercelEnv(); vv != "" {
currentVal = vv
sourceVal = "env:vercel"
return
}
currentVal = "dev"
sourceVal = "default"
})
return currentVal, sourceVal
}
func readVersionFile() string {
candidates := []string{"VERSION"}
if wd, err := os.Getwd(); err == nil {
candidates = append(candidates, filepath.Join(wd, "VERSION"))
}
if _, file, _, ok := runtime.Caller(0); ok {
repoRoot := filepath.Clean(filepath.Join(filepath.Dir(file), "../.."))
candidates = append(candidates, filepath.Join(repoRoot, "VERSION"))
}
seen := map[string]struct{}{}
for _, c := range candidates {
c = filepath.Clean(strings.TrimSpace(c))
if c == "" {
continue
}
if _, ok := seen[c]; ok {
continue
}
seen[c] = struct{}{}
b, err := os.ReadFile(c)
if err != nil {
continue
}
if v := strings.TrimSpace(string(b)); v != "" {
return v
}
}
return ""
}
func normalize(v string) string {
v = strings.TrimSpace(v)
if v == "" {
return ""
}
return strings.TrimPrefix(v, "v")
}
func Tag(v string) string {
v = normalize(v)
if v == "" || v == "dev" {
return v
}
if v[0] < '0' || v[0] > '9' {
return v
}
return "v" + v
}
func versionFromVercelEnv() string {
if tag := normalize(strings.TrimSpace(os.Getenv("VERCEL_GIT_COMMIT_TAG"))); tag != "" {
return tag
}
ref := strings.TrimSpace(os.Getenv("VERCEL_GIT_COMMIT_REF"))
sha := strings.TrimSpace(os.Getenv("VERCEL_GIT_COMMIT_SHA"))
if len(sha) > 7 {
sha = sha[:7]
}
ref = sanitizeVersionLabel(ref)
sha = sanitizeVersionLabel(sha)
if ref == "" && sha == "" {
return ""
}
if ref != "" && sha != "" {
return "preview-" + ref + "." + sha
}
if ref != "" {
return "preview-" + ref
}
return "preview-" + sha
}
func sanitizeVersionLabel(in string) string {
in = strings.TrimSpace(strings.ToLower(in))
if in == "" {
return ""
}
var b strings.Builder
b.Grow(len(in))
prevDash := false
for i := 0; i < len(in); i++ {
c := in[i]
if (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') {
b.WriteByte(c)
prevDash = false
continue
}
if !prevDash {
b.WriteByte('-')
prevDash = true
}
}
out := strings.Trim(b.String(), "-")
return out
}
func Compare(a, b string) int {
pa := parse(normalize(a))
pb := parse(normalize(b))
for i := 0; i < 3; i++ {
if pa[i] < pb[i] {
return -1
}
if pa[i] > pb[i] {
return 1
}
}
return 0
}
func parse(v string) [3]int {
var out [3]int
parts := strings.SplitN(v, ".", 4)
for i := 0; i < 3 && i < len(parts); i++ {
n := readLeadingInt(parts[i])
out[i] = n
}
return out
}
func readLeadingInt(s string) int {
s = strings.TrimSpace(s)
if s == "" {
return 0
}
i := 0
for ; i < len(s); i++ {
if s[i] < '0' || s[i] > '9' {
break
}
}
if i == 0 {
return 0
}
n, err := strconv.Atoi(s[:i])
if err != nil {
return 0
}
return n
}
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