longest word

.gitignore

@@ -31,3 +31,4 @@ w1d1ex2/w1d1ex2
 go-cat2/go-cat2
 lower-1line/lower-1line
 upper-words/upper-words
+longest-word/longest-word

longest-word/main.go

@@ -0,0 +1,45 @@
+package main
+
+import "fmt"
+import "io"
+import "log"
+import "os"
+import "bufio"
+import "strings"
+
+func longest(r io.Reader) string {
+	lw := ""
+	s := bufio.NewScanner(r)
+	s.Split(bufio.ScanWords)
+	for s.Scan() {
+		word := s.Text()
+		word = strings.ToLower(word)
+		word = strings.Replace(word, ".", "", -1)
+		word = strings.Replace(word, ",", "", -1)
+		word = strings.Replace(word, "\"", "", -1)
+		for _, word := range strings.Split(word, "—") {
+			if len(word) > len(lw) {
+				if !strings.HasPrefix(word, "http://") {
+					lw = word
+				}
+			}
+		}
+	}
+	return lw
+}
+
+func openFile(path *string) *os.File {
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalln(err)
+	}
+	return f
+}
+func main() {
+	if len(os.Args) <= 1 {
+		log.Fatalln("Missing file")
+	}
+	f := openFile(&os.Args[1])
+
+	fmt.Println(longest(f))
+}