Able to read input

10/code.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+)
+
+type op byte
+
+const (
+	addx op = iota
+	noop
+)
+
+type command struct {
+	instruction op
+	value       int
+}
+
+func readInput(file *os.File) []command {
+	scanner := bufio.NewScanner(file)
+	var commands []command
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if line == "" {
+			continue
+		}
+
+		var current command
+		if line[0] == 'n' {
+			current.instruction = noop
+		} else {
+			current.instruction = addx
+			n, err := fmt.Sscanf(line, "addx %d", &current.value)
+			if n != 1 || err != nil {
+				log.Fatal("Can't parse input:", err, line)
+			}
+		}
+
+		commands = append(commands, current)
+	}
+
+	return commands
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatal("You need to specify a file!")
+	}
+
+	filePath := os.Args[1]
+	file, err := os.Open(filePath)
+	if err != nil {
+		log.Fatalf("Failed to open %s!\n", filePath)
+
+	}
+
+	commands := readInput(file)
+	fmt.Println(commands)
+}