Able to read input

15/code.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+)
+
+type point struct {
+	x int
+	y int
+}
+
+func readInput(file *os.File) [][2]point {
+	scanner := bufio.NewScanner(file)
+	var points [][2]point
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if line == "" {
+			continue
+		}
+
+		var current [2]point
+		n, err := fmt.Sscanf(line, "Sensor at x=%d, y=%d: closest beacon is at x=%d, y=%d", &current[0].x, &current[0].y, &current[1].x, &current[1].y)
+		if n != 4 || err != nil {
+			log.Fatal("Can't parse", line, err)
+		}
+		points = append(points, current)
+	}
+
+	return points
+}
+
+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)
+
+	}
+
+	points := readInput(file)
+	fmt.Println(points)
+}