bbx: 增加version命令，显示bbx工具的版本信息。变更makefile文件，增加帮助信息的输出

Author: apple

Makefile

@@ -9,12 +9,16 @@ else
 	endif
 endif
 
-TAG := "v1.0.1"
+VERSION_FILE := cmd/version.go
+TAG := $(shell sed -rn 's/const version = "(.*)"/\1/p' $(VERSION_FILE))
 OS_LIST := windows darwin linux
 ARCH_LIST := 386 amd64 arm64
 
 auto: $(TARGET)
 
+test:
+		@echo $(TAG)
+
 tidy:
 		@go mod tidy
 
@@ -73,4 +77,4 @@ help:
 		@echo "clean:        make clean                      clean bbx and bbx.exe file"
 		@echo "clean_all     make clean_all                  clean all binary files"
 		@echo "install:      make install                    install binary file to GOBIN dir"
-		@echo "gen_releases: make gen_releases [TAG=v1.0.1]  generate releases into releases/\$$TAG dir"
+		@echo "gen_releases: make gen_releases               generate releases into releases/$(TAG)"

cmd/version.go

@@ -0,0 +1,38 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+const version = "v1.0.2"
+
+// versionCmd represents the version command
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "A brief description of your command",
+	Long: `A longer description that spans multiple lines and likely contains examples
+and usage of using your command. For example:
+
+Cobra is a CLI library for Go that empowers applications.
+This application is a tool to generate the needed files
+to quickly create a Cobra application.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println(version)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+
+	// Here you will define your flags and configuration settings.
+
+	// Cobra supports Persistent Flags which will work for this command
+	// and all subcommands, e.g.:
+	// versionCmd.PersistentFlags().String("foo", "", "A help for foo")
+
+	// Cobra supports local flags which will only run when this command
+	// is called directly, e.g.:
+	// versionCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+}