Able to read input

04/code.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+)
+
+type pair struct {
+	first  [2]int
+	second [2]int
+}
+
+func readInput(file *os.File) []pair {
+	scanner := bufio.NewScanner(file)
+	var pairs []pair
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if line == "" {
+			continue
+		}
+
+		current := pair{}
+		n, err := fmt.Sscanf(line, "%d-%d,%d-%d", &current.first[0], &current.first[1], &current.second[0], &current.second[1])
+		if n != 4 || err != nil {
+			log.Fatal("Problem reading input:", err)
+		}
+
+		pairs = append(pairs, current)
+	}
+
+	return pairs
+}
+
+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)
+
+	}
+
+	pairs := readInput(file)
+	fmt.Println(pairs)
+}