#2

internal/config/command.go

@@ -0,0 +1,6 @@
+package config
+
+type Command struct {
+	Name string
+	Args []string
+}

internal/config/commands.go

@@ -0,0 +1,19 @@
+package config
+
+import "errors"
+
+type Commands struct {
+	Commands map[string]func(*State, Command) error
+}
+
+func (c *Commands) Register(name string, f func(*State, Command) error) {
+	c.Commands[name] = f
+}
+
+func (c *Commands) Run(s *State, cmd Command) error {
+	f, ok := c.Commands[cmd.Name]
+	if !ok {
+		return errors.New("unknown command: " + cmd.Name)
+	}
+	return f(s, cmd)
+}

internal/config/config.go

@@ -3,7 +3,6 @@ package config
 import (
 	"encoding/json"
 	"os"
-	"os/user"
 )
 
 const configFileName = ".gatorconfig.json"
@@ -31,22 +30,9 @@ func Read() (Config, error) {
 
 }
 
-func (config Config) SetUser() error {
+func (config Config) SetUser(username string) error {
-	usr, err := user.Current()
+	config.CurrentUserName = username
-
+	return write(config)
-	if err != nil {
-		return err
-	}
-
-	config.CurrentUserName = usr.Username
-
-	err = write(config)
-	if err != nil {
-		return err
-	}
-
-	return nil
-
 }
 
 func getConfigFilePath() (string, error) {
@@ -68,7 +54,9 @@ func write(cfg Config) error {
 	if err != nil {
 		return err
 	}
-	defer file.Close()
+	defer func(file *os.File) {
+		_ = file.Close()
+	}(file)
 
 	encoder := json.NewEncoder(file)
 	encoder.SetIndent("", "  ") // For pretty printing

internal/config/state.go

@@ -0,0 +1,5 @@
+package config
+
+type State struct {
+	Config *Config
+}

internal/handlers/loginHandler.go

@@ -0,0 +1,22 @@
+package handlers
+
+import (
+	"errors"
+	"fmt"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/config"
+)
+
+func HandlerLogin(s *config.State, cmd config.Command) error {
+	if len(cmd.Args) < 1 {
+		return errors.New("missing required argument USERNAME")
+	}
+
+	err := s.Config.SetUser(cmd.Args[0])
+	if err != nil {
+		return fmt.Errorf("failed to set current user: %w", err)
+	}
+
+	fmt.Printf("User set to %s\n", s.Config.CurrentUserName)
+
+	return nil
+}

main.go

@@ -1,23 +1,41 @@
 package main
 
 import (
-	"fmt"
 	"github.com/rdarius/boot-dev-blog-aggregator/internal/config"
+	"github.com/rdarius/boot-dev-blog-aggregator/internal/handlers"
 	"log"
+	"os"
 )
 
+var commands config.Commands
+
 func main() {
 
 	cfg, err := config.Read()
 	if err != nil {
 		log.Fatal(err)
 	}
-	cfg.SetUser()
 
-	cfg2, err := config.Read()
+	state := config.State{
+		Config: &cfg,
+	}
+
+	commands = config.Commands{
+		Commands: map[string]func(*config.State, config.Command) error{},
+	}
+
+	commands.Register("login", handlers.HandlerLogin)
+
+	if len(os.Args) < 2 {
+		log.Fatal("usage: boot-dev-blog-aggregator <command> [args...]")
+		return
+	}
+
+	name := os.Args[1]
+	args := os.Args[2:]
+
+	err = commands.Run(&state, config.Command{Name: name, Args: args})
 	if err != nil {
 		log.Fatal(err)
 	}
-	fmt.Printf("%v\n", cfg2)
-
 }