add version subcmd

cmd/root.go

@@ -1,11 +1,14 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
 )
 
+var version string
+
 var rootCmd = &cobra.Command{
 	Use:   "clibgen",
 	Short: "Library Genesis command line / terminal client",
@@ -14,6 +17,15 @@ Clibgen is a CLI application to search and download epubs, pdfs, from library ge
 Useful if you are lazy to open up a browser to download e-books/resources.`,
 }
 
+var versionCmd = &cobra.Command{
+  Use:   "version",
+  Short: "Print the version number of Hugo",
+  Long:  `All software has versions. This is Hugo's`,
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println(version)
+  },
+}
+
 func Execute() {
 	err := rootCmd.Execute()
 	if err != nil {
@@ -22,5 +34,5 @@ func Execute() {
 }
 
 func init() {
-	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+  rootCmd.AddCommand(versionCmd)
 }

main.go

@@ -1,6 +1,8 @@
 package main
 
-import "github.com/laureanray/clibgen/cmd"
+import (
+	"github.com/laureanray/clibgen/cmd"
+)
 
 func main() {
 	cmd.Execute()