upperwords

.gitignore

@@ -30,3 +30,4 @@ swap/swap
 w1d1ex2/w1d1ex2
 go-cat2/go-cat2
 lower-1line/lower-1line
+upper-words/upper-words

upper-words/main.go

@@ -0,0 +1,78 @@
+package main
+
+import "bufio"
+
+//import "fmt"
+import "io"
+import "log"
+import "os"
+import "strings"
+
+func splitWord(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) > 0 {
+		//fmt.Print("EOF")
+		return len(data), data, nil
+	}
+	splitAt := -1
+	if len(data) > 0 {
+		for i, c := range data {
+			//fmt.Print(string(c))
+			switch string(c) {
+			case "\n":
+				fallthrough
+			case " ":
+				fallthrough
+			case "\t":
+				if splitAt < 0 {
+					splitAt = i
+				}
+			default:
+				if splitAt > 0 {
+					return i, data[:splitAt], nil
+				}
+			}
+		}
+		//fmt.Println()
+	}
+	return 0, nil, nil
+}
+
+func transform(in io.Reader, out io.Writer) {
+	bufw := bufio.NewWriter(out)
+	s := bufio.NewScanner(in)
+	//s.Split(bufio.ScanWords)
+	s.Split(splitWord)
+	for s.Scan() {
+		token := s.Text()
+		//fmt.Println(token)
+		if len(token) > 1 {
+			bufw.WriteString(strings.ToUpper(string(token[0])) + token[1:] + " ")
+		}
+	}
+	bufw.Flush()
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatalln("Usage upper-line <file>")
+	}
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		log.Fatalln("Error opening file", err)
+	}
+	defer f.Close()
+
+	var w io.Writer
+	if len(os.Args) >= 3 {
+		fout, err := os.Create(os.Args[2])
+		if err != nil {
+			log.Fatalln("Error creating file", err)
+		}
+		defer fout.Close()
+		w = fout
+	} else {
+		w = os.Stdout
+	}
+
+	transform(f, w)
+}