init

internal/version/version.go

@@ -0,0 +1,69 @@
+// Package version exposes build metadata injected at link time.
+package version
+
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+	"sync"
+)
+
+// Injected via -ldflags "-X github.com/iceBear67/simplepages/internal/version.Version=...".
+var (
+	Version = "dev"
+	Commit  = ""
+	Date    = ""
+)
+
+var once sync.Once
+
+// vcsFromBuildInfo fills Commit/Date from the embedded build info when the
+// linker flags were not supplied (the usual case for `go run` and `go install`).
+func vcsFromBuildInfo() {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	for _, s := range info.Settings {
+		switch s.Key {
+		case "vcs.revision":
+			if Commit == "" {
+				Commit = s.Value
+			}
+		case "vcs.time":
+			if Date == "" {
+				Date = s.Value
+			}
+		}
+	}
+}
+
+// String renders a one-line human-readable version banner.
+func String() string {
+	once.Do(vcsFromBuildInfo)
+	s := Version
+	if Commit != "" {
+		short := Commit
+		if len(short) > 12 {
+			short = short[:12]
+		}
+		s += "+" + short
+	}
+	if Date != "" {
+		s += " (" + Date + ")"
+	}
+	return fmt.Sprintf("%s %s/%s %s", s, runtime.GOOS, runtime.GOARCH, runtime.Version())
+}
+
+// Short returns just the version string, for API responses.
+func Short() string {
+	once.Do(vcsFromBuildInfo)
+	if Commit == "" {
+		return Version
+	}
+	short := Commit
+	if len(short) > 12 {
+		short = short[:12]
+	}
+	return Version + "+" + short
+}