refactor: move root command into internal package

The Cobra command and Execute() function are not part of the public API and
should not be imported by downstream consumers. Placing it logic under
internal/cmd strengthens encapsulation and allows the CLI wiring to evolve
without creating a breaking change surface.

Signed-off-by: Roman Dmytrenko <rdmytrenko@gmail.com>

Author: erka

cmd/lazykiq/main.go

@@ -1,10 +1,21 @@
 // Package main provides the lazykiq CLI entry point.
 package main
 
-import "os"
+import (
+	"os"
+
+	"github.com/kpumuk/lazykiq/internal/cmd"
+)
+
+var (
+	Version = "dev"
+	Commit  = ""
+	Date    = ""
+	BuiltBy = ""
+)
 
 func main() {
-	if err := Execute(); err != nil {
+	if err := cmd.Execute(Version, Commit, Date, BuiltBy); err != nil {
 		os.Exit(1)
 	}
 }

cmd/lazykiq/root.go internal/cmd/root.gocmd/lazykiq/root.go renamed to internal/cmd/root.go

@@ -1,4 +1,6 @@
-package main
+// Package cmd provides the entrypoint and CLI command configuration for the
+// lazykiq application.
+package cmd
 
 import (
 	"context"
@@ -16,30 +18,6 @@ import (
 	"github.com/kpumuk/lazykiq/internal/ui"
 )
 
-var (
-	Version = "dev"
-	Commit  = ""
-	Date    = ""
-	BuiltBy = ""
-)
-
-var rootCmd = &cobra.Command{
-	Use:   "lazykiq",
-	Short: "A terminal UI for Sidekiq.",
-	Long:  "A terminal UI for Sidekiq.",
-	Args:  cobra.NoArgs,
-}
-
-func Execute() error {
-	return fang.Execute(
-		context.Background(),
-		rootCmd,
-		fang.WithVersion(rootCmd.Version),
-		fang.WithoutCompletions(),
-		fang.WithoutManpage(),
-	)
-}
-
 func buildVersion(version, commit, date, builtBy string) string {
 	result := version
 	if commit != "" {
@@ -59,8 +37,16 @@ func buildVersion(version, commit, date, builtBy string) string {
 	return result
 }
 
-func init() {
-	rootCmd.Version = buildVersion(Version, Commit, Date, BuiltBy)
+// Execute initializes and runs the lazykiq terminal application.
+func Execute(version, commit, date, builtBy string) error {
+	rootCmd := &cobra.Command{
+		Use:   "lazykiq",
+		Short: "A terminal UI for Sidekiq.",
+		Long:  "A terminal UI for Sidekiq.",
+		Args:  cobra.NoArgs,
+	}
+
+	rootCmd.Version = buildVersion(version, commit, date, builtBy)
 	rootCmd.SetVersionTemplate(`lazykiq {{printf "version %s\n" .Version}}`)
 
 	rootCmd.Flags().String(
@@ -126,4 +112,12 @@ func init() {
 
 		return nil
 	}
+
+	return fang.Execute(
+		context.Background(),
+		rootCmd,
+		fang.WithVersion(rootCmd.Version),
+		fang.WithoutCompletions(),
+		fang.WithoutManpage(),
+	)
 }