feat: add help and exit commands

repl.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"regexp"
+	"strings"
+)
+
+func cleanInput(input string) []string {
+	normalized := strings.ToLower(input)
+	trimmed := strings.TrimSpace(normalized)
+
+	re := regexp.MustCompile(`[\s]+`)
+
+	words := re.Split(trimmed, -1)
+	return words
+}
+
+type inputScanner interface {
+	Scan() bool
+	Err() error
+	Text() string
+}
+
+func runREPL(s inputScanner, w io.Writer, sanitizer func(string) []string) {
+	context := NewContext()
+
+	for {
+		fmt.Fprint(w, "Pokedex > ")
+
+		s.Scan()
+		err := s.Err()
+
+		if err != nil {
+			fmt.Fprintf(w, "Pokedex > Sorry I didn't get that.\n")
+			continue
+		}
+
+		input := s.Text()
+
+		if input == "" {
+			break
+		}
+
+		cleanedInput := sanitizer(input)
+
+		if len(cleanedInput) < 1 {
+			fmt.Fprintf(w, "Pokedex > Sorry I couldn't understand that.\n")
+			continue
+		}
+
+		requestedCommand := cleanedInput[0]
+		command, exists := context.commands[requestedCommand]
+
+		if !exists {
+			fmt.Fprintln(w, "Unknown command")
+			continue
+		}
+
+		err = command.callback(context)
+
+		if err != nil {
+			fmt.Fprintf(w, "Pokedex > Error occurred executing command: %s", err)
+		}
+	}
+}