Add version flag to display current version

internal/config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"errors"
+	"fmt"
 	"log"
 	"os"
 	"strings"
@@ -13,10 +14,11 @@ import (
 )
 
 type CLI struct {
-	NoConfigFile               bool   `short:"C" default:"false" help:"Disable config file creation."`
-	ConfigFilePath             string `short:"c" default:"bibliomane.toml" type:"path" help:"Config file path."`
-	DisableStoreJWTKeyInConfig bool   `default:"false" help:"Do not store the generated key used for JWT when initializing configuration."`
-	ConfigFile                 Config `embed:"" prefix:""`
+	Version                    kong.VersionFlag `short:"v"`
+	NoConfigFile               bool             `short:"C" default:"false" help:"Disable config file creation."`
+	ConfigFilePath             string           `short:"c" default:"bibliomane.toml" type:"path" help:"Config file path."`
+	DisableStoreJWTKeyInConfig bool             `default:"false" help:"Do not store the generated key used for JWT when initializing configuration."`
+	ConfigFile                 Config           `embed:"" prefix:""`
 }
 
 type Config struct {
@@ -61,12 +63,12 @@ func defaultConfig() CLI {
 	return CLI{NoConfigFile: false, ConfigFilePath: "bibliomane.toml", DisableStoreJWTKeyInConfig: false, ConfigFile: c}
 }
 
-func LoadConfig() Config {
+func LoadConfig(applicationVersion string) Config {
 
 	var cfg CLI
 
 	//parse first to get config path
-	kong.Parse(&cfg)
+	kong.Parse(&cfg, kong.Vars{"version": fmt.Sprintf("bibliomane v%s", applicationVersion)})
 
 	configPath := cfg.ConfigFilePath
 

main.go

@@ -6,7 +6,8 @@ import (
 )
 
 func main() {
-	c := config.LoadConfig()
+	applicationVersion := "0.0.0"
+	c := config.LoadConfig(applicationVersion)
 	r := setup.Setup(&c)
 	r.Run(":" + c.Port)
 }