Able to read data

day13/day13.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type schedule struct {
+	timestamp int64
+	buses     map[int64]int64
+}
+
+func getIDs(busesString string) (map[int64]int64, error) {
+	buses := make(map[int64]int64)
+
+	for _, bus := range strings.Split(busesString, ",") {
+		if bus == "x" {
+			continue
+		}
+
+		busID, err := strconv.ParseInt(bus, 10, 32)
+		if err != nil {
+			return buses, fmt.Errorf("Error parsing busID %s: %s", bus, err)
+		}
+		buses[busID] = 0
+	}
+
+	return buses, nil
+}
+
+func readData(file *os.File) (schedule, error) {
+	scanner := bufio.NewScanner(file)
+	data := schedule{}
+
+	if !scanner.Scan() {
+		return data, fmt.Errorf("Error reading timestamp!")
+	}
+	timestampString := scanner.Text()
+
+	timestamp, err := strconv.ParseInt(timestampString, 10, 32)
+	if err != nil {
+		return data, fmt.Errorf("Error parsing timestamp %s: %s", timestampString, err)
+	}
+	data.timestamp = timestamp
+
+	if !scanner.Scan() {
+		return data, fmt.Errorf("Error reading buses!")
+	}
+	busesString := scanner.Text()
+	if err := scanner.Err(); err != nil {
+		return data, err
+	}
+
+	data.buses, err = getIDs(busesString)
+	if err != nil {
+		return data, err
+	}
+
+	return data, nil
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatal("You need to specify a file!")
+	}
+
+	file, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalf("Failed to open %s!\n", os.Args[1])
+
+	}
+
+	data, err := readData(file)
+	if err != nil {
+		log.Fatalf("Failed to read data: %s\n", err)
+	}
+	fmt.Println(data)
+}