Refactor: standalone version module

Makefile

@@ -11,8 +11,8 @@ CGO_ENABLED := 0
 GO111MODULE := on
 
 LDFLAGS += -w -s -buildid=
-LDFLAGS += -X "$(MODULE)/constant.Version=$(BUILD_VERSION)"
-LDFLAGS += -X "$(MODULE)/constant.GitCommit=$(BUILD_COMMIT)"
+LDFLAGS += -X "$(MODULE)/version.Version=$(BUILD_VERSION)"
+LDFLAGS += -X "$(MODULE)/version.GitCommit=$(BUILD_COMMIT)"
 
 GO_BUILD = GO111MODULE=$(GO111MODULE) CGO_ENABLED=$(CGO_ENABLED) \
 	go build $(BUILD_FLAGS) -ldflags '$(LDFLAGS)' -tags '$(BUILD_TAGS)' -trimpath

constant/version.go

@@ -1,10 +0,0 @@
-package constant
-
-const (
-	Name = "tun2socks"
-)
-
-var (
-	Version   string
-	GitCommit string
-)

engine/engine.go

@@ -2,6 +2,7 @@ package engine
 
 import (
 	"errors"
+	"fmt"
 	"os"
 
 	"github.com/xjasonlyu/tun2socks/v2/component/dialer"
@@ -11,6 +12,7 @@ import (
 	"github.com/xjasonlyu/tun2socks/v2/proxy"
 	"github.com/xjasonlyu/tun2socks/v2/stats"
 	"github.com/xjasonlyu/tun2socks/v2/tunnel"
+	"github.com/xjasonlyu/tun2socks/v2/version"
 
 	"gopkg.in/yaml.v3"
 )
@@ -60,7 +62,8 @@ func (e *engine) start() error {
 	}
 
 	if e.Version {
-		showVersion()
+		fmt.Println(version.String())
+		fmt.Println(version.BuildString())
 		os.Exit(0)
 	}
 

engine/version.go

@@ -1,22 +0,0 @@
-package engine
-
-import (
-	"fmt"
-	"runtime"
-	"strings"
-
-	V "github.com/xjasonlyu/tun2socks/v2/constant"
-)
-
-func showVersion() {
-	fmt.Print(versionString())
-	fmt.Print(releaseString())
-}
-
-func versionString() string {
-	return fmt.Sprintf("%s-%s\n", V.Name, strings.TrimPrefix(V.Version, "v"))
-}
-
-func releaseString() string {
-	return fmt.Sprintf("%s/%s, %s, %s\n", runtime.GOOS, runtime.GOARCH, runtime.Version(), V.GitCommit)
-}

stats/server.go

@@ -8,9 +8,9 @@ import (
 	"strings"
 	"time"
 
-	V "github.com/xjasonlyu/tun2socks/v2/constant"
 	"github.com/xjasonlyu/tun2socks/v2/log"
 	"github.com/xjasonlyu/tun2socks/v2/tunnel/statistic"
+	V "github.com/xjasonlyu/tun2socks/v2/version"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/cors"

version/version.go

@@ -0,0 +1,27 @@
+package version
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+)
+
+const Name = "tun2socks"
+
+var (
+	// Version can be set at link time by executing
+	// the command: `git describe --abbrev=0 --tags HEAD`
+	Version string
+
+	// GitCommit can be set at link time by executing
+	// the command: `git rev-parse --short HEAD`
+	GitCommit string
+)
+
+func String() string {
+	return fmt.Sprintf("%s-%s", Name, strings.TrimPrefix(Version, "v"))
+}
+
+func BuildString() string {
+	return fmt.Sprintf("%s/%s, %s, %s", runtime.GOOS, runtime.GOARCH, runtime.Version(), GitCommit)
+}