Refactor implementations of get and list commands

- Simplify the main functions by moving actual implementation to "pkg" package
- Remove the "path" package and move files into the root "pkg" package
- Replace viper with explicit Cfg structs

cmd/list/main.go

@@ -1,28 +1,25 @@
 package main
 
 import (
-	"fmt"
+	"git-get/pkg"
 	"git-get/pkg/cfg"
-	"git-get/pkg/path"
-	"git-get/pkg/print"
-	"os"
 
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
 
 var cmd = &cobra.Command{
-	Use:     "git-list",
-	Short:   "git list",
-	Run:     Run,
-	Args:    cobra.NoArgs,
-	Version: cfg.Version(),
+	Use:          "git-list",
+	Short:        "git list",
+	RunE:         run,
+	Args:         cobra.NoArgs,
+	Version:      cfg.Version(),
+	SilenceUsage: true,
 }
 
 func init() {
 	cmd.PersistentFlags().StringP(cfg.KeyReposRoot, "r", "", "repos root")
 	cmd.PersistentFlags().StringP(cfg.KeyPrivateKey, "p", "", "SSH private key path")
-
 	cmd.PersistentFlags().BoolP(cfg.KeyFetch, "f", false, "Fetch from remotes when listing repositories")
 	cmd.PersistentFlags().StringP(cfg.KeyOutput, "o", cfg.DefOutput, "output format.")
 
@@ -32,46 +29,19 @@ func init() {
 	viper.BindPFlag(cfg.KeyOutput, cmd.PersistentFlags().Lookup(cfg.KeyOutput))
 }
 
-func Run(cmd *cobra.Command, args []string) {
-	cfg.InitConfig()
+func run(cmd *cobra.Command, args []string) error {
+	cfg.Init()
 
-	root := viper.GetString(cfg.KeyReposRoot)
-
-	// TODO: move it to OpenAll and don't export
-	paths, err := path.FindRepos()
-	exitIfError(err)
-
-	repos, err := path.OpenAll(paths)
-	exitIfError(err)
-
-	var printer print.Printer
-	switch viper.GetString(cfg.KeyOutput) {
-	case cfg.OutFlat:
-		printer = &print.FlatPrinter{}
-	case cfg.OutTree:
-		printer = &print.SimpleTreePrinter{}
-	case cfg.OutSmart:
-		printer = &print.SmartTreePrinter{}
-	case cfg.OutDump:
-		printer = &print.DumpPrinter{}
-	default:
-		err = fmt.Errorf("invalid --out flag; allowed values: %v", []string{cfg.OutFlat, cfg.OutTree, cfg.OutSmart})
+	config := &pkg.ListCfg{
+		Fetch:      viper.GetBool(cfg.KeyFetch),
+		Output:     viper.GetString(cfg.KeyOutput),
+		PrivateKey: viper.GetString(cfg.KeyPrivateKey),
+		Root:       viper.GetString(cfg.KeyReposRoot),
 	}
-	exitIfError(err)
 
-	fmt.Println(printer.Print(root, repos))
+	return pkg.List(config)
 }
 
 func main() {
-	if err := cmd.Execute(); err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-}
-
-func exitIfError(err error) {
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
+	cmd.Execute()
 }