Started working on map command

command_exit.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func commandExit() error {
+	fmt.Println("Closing the Pokedex... Goodbye!")
+	os.Exit(0)
+	return nil
+}

command_help.go

@@ -0,0 +1,15 @@
+package main
+
+import "fmt"
+
+func commandHelp() error {
+	fmt.Println()
+	fmt.Println("Welcome to the Pokedex!")
+	fmt.Println("Usage:")
+	fmt.Println()
+	for _, c := range getCommands() {
+		fmt.Printf("\t%v\t\t%v\n", c.name, c.description)
+	}
+	fmt.Println()
+	return nil
+}

main.go

@@ -1,21 +1,7 @@
 package main
 
-import (
-	"bufio"
-	"fmt"
-	"os"
-)
-
 const prompt = "Pokedex > "
 
 func main() {
-	dexScanner := bufio.NewScanner(os.Stdin)
-	for {
-		fmt.Print(prompt)
-		if !dexScanner.Scan() {
-			break
-		}
-		command := cleanInput(dexScanner.Text())
-		fmt.Println("Your command was:", command[0])
-	}
+	startRepl()
 }

repl.go

@@ -1,6 +1,68 @@
 package main
 
-import "strings"
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func getCommands() map[string]cliCommand {
+	return map[string]cliCommand{
+		"exit": {
+			name:        "exit",
+			description: "Exit the pokedex",
+			callback:    commandExit,
+		},
+		"help": {
+			name:        "help",
+			description: "Displays a help message",
+			callback:    commandHelp,
+		},
+		"map": {
+			name:        "map",
+			description: "Displays the names of the next 20 locations",
+		},
+		"mapb": {
+			name:        "mapb",
+			description: "Displays the names of the previous 20 locations",
+		},
+	}
+}
+
+func startRepl() {
+	reader := bufio.NewScanner(os.Stdin)
+	for {
+		fmt.Print(prompt)
+		reader.Scan()
+
+		words := cleanInput(reader.Text())
+		if len(words) == 0 {
+			continue
+		}
+
+		inputCommand := words[0]
+		command, exists := getCommands()[inputCommand]
+
+		if exists {
+			err := command.callback()
+			if err != nil {
+				fmt.Printf("%v error: %v", command.name, err.Error())
+			}
+		} else {
+
+			fmt.Println("Unknown command")
+			continue
+		}
+
+	}
+}
+
+type cliCommand struct {
+	name        string
+	description string
+	callback    func() error
+}
 
 func cleanInput(text string) []string {
 	input := strings.ToLower(text)