chore: set version when built outside makefile

close #103

pkg/version/version.go

@@ -3,6 +3,8 @@ package version
 import (
 	"flag"
 	"fmt"
+	"runtime/debug"
+	"time"
 )
 
 // Version of the app
@@ -28,3 +30,26 @@ This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
 `, Version, GitCommit, Built)
 }
+
+func init() {
+	if GitCommit != "snapshot" {
+		return
+	}
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+	Version = info.Main.Version
+	for _, kv := range info.Settings {
+		if kv.Value == "" {
+			continue
+		}
+		switch kv.Key {
+		case "vcs.revision":
+			GitCommit = kv.Value[:7]
+		case "vcs.time":
+			lastCommit, _ := time.Parse(time.RFC3339, kv.Value)
+			Built = lastCommit.Format(time.RFC1123)
+		}
+	}
+}