Able to read tokens

day18/day18.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func getTokens(line string) ([]string, error) {
+	scanner := bufio.NewScanner(strings.NewReader(line))
+	scanner.Split(bufio.ScanWords)
+	var tokens []string
+	for scanner.Scan() {
+		tokens = append(tokens, scanner.Text())
+	}
+	if err := scanner.Err(); err != nil {
+		return tokens, fmt.Errorf("Scanner error: %s", err)
+	}
+
+	return tokens, nil
+}
+
+func readFile(file *os.File) {
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if line == "" {
+			continue
+		}
+
+		tokens, err := getTokens(line)
+		if err != nil {
+			log.Fatalf("Error scanning %s: %s", line, err)
+		}
+
+		fmt.Println(strings.Join(tokens, ","))
+
+	}
+	if err := scanner.Err(); err != nil {
+		log.Fatalf("Scanner error: %s", err)
+	}
+}
+
+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)
+
+	}
+
+	readFile(file)
+	if err := file.Close(); err != nil {
+		log.Fatalf("Failed to close file: %s", err)
+	}
+}