adding version flag (#78)

cli.go

@@ -7,24 +7,44 @@ import (
 	"github.com/digitalghost-dev/poke-cli/cmd"
 	"github.com/digitalghost-dev/poke-cli/flags"
 	"os"
+	"runtime/debug"
 )
 
 var (
 	styleBold  = lipgloss.NewStyle().Bold(true)
 	helpBorder = lipgloss.NewStyle().
-			BorderStyle(lipgloss.RoundedBorder()).
-			BorderForeground(lipgloss.Color("#FFCC00"))
+		BorderStyle(lipgloss.RoundedBorder()).
+		BorderForeground(lipgloss.Color("#FFCC00"))
 	errorColor  = lipgloss.NewStyle().Foreground(lipgloss.Color("#F2055C"))
 	errorBorder = lipgloss.NewStyle().
-			BorderStyle(lipgloss.RoundedBorder()).
-			BorderForeground(lipgloss.Color("#F2055C"))
+		BorderStyle(lipgloss.RoundedBorder()).
+		BorderForeground(lipgloss.Color("#F2055C"))
 )
 
+var version = "(devel)"
+
+func currentVersion() {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		fmt.Println("Unable to determine version information.")
+		return
+	}
+
+	if buildInfo.Main.Version != "" {
+		fmt.Printf("Version: %s\n", buildInfo.Main.Version)
+	} else {
+		fmt.Println("Version: unknown")
+	}
+}
+
 func runCLI(args []string) int {
 	mainFlagSet := flag.NewFlagSet("poke-cli", flag.ContinueOnError)
 	latestFlag := mainFlagSet.Bool("latest", false, "Prints the program's latest Docker Image and Release versions.")
 	shortLatestFlag := mainFlagSet.Bool("l", false, "Prints the program's latest Docker Image and Release versions.")
 
+	currentVersionFlag := mainFlagSet.Bool("version", false, "Prints the current version")
+	shortCurrentVersionFlag := mainFlagSet.Bool("v", false, "Prints the current version")
+
 	mainFlagSet.Usage = func() {
 		helpMessage := helpBorder.Render(
 			"Welcome! This tool displays data related to Pokémon!",
@@ -34,8 +54,8 @@ func runCLI(args []string) int {
 			fmt.Sprintf("\n\t%-15s %s", "poke-cli <command> <subcommand> [flag]", ""),
 			"\n\n", styleBold.Render("FLAGS:"),
 			fmt.Sprintf("\n\t%-15s %s", "-h, --help", "Shows the help menu"),
-			fmt.Sprintf("\n\t%-15s %s", "-l, --latest", "Prints the latest available"),
-			fmt.Sprintf("\n\t%-15s %s", "", "version of the program"),
+			fmt.Sprintf("\n\t%-15s %s", "-l, --latest", "Prints the latest version available"),
+			fmt.Sprintf("\n\t%-15s %s", "-v, --version", "Prints the current version"),
 			"\n\n", styleBold.Render("AVAILABLE COMMANDS:"),
 			fmt.Sprintf("\n\t%-15s %s", "pokemon", "Get details of a specific Pokémon"),
 			fmt.Sprintf("\n\t%-15s %s", "types", "Get details of a specific typing"),
@@ -70,6 +90,9 @@ func runCLI(args []string) int {
 	} else if *latestFlag || *shortLatestFlag {
 		flags.LatestFlag()
 		return 0
+	} else if *currentVersionFlag || *shortCurrentVersionFlag {
+		currentVersion()
+		return 0
 	} else if cmdFunc, exists := commands[os.Args[1]]; exists {
 		cmdFunc()
 		return 0