Implemented not repeating combinations.

pin/pin.go

@@ -14,15 +14,10 @@ var(
 	arg0 string
 	delim rune = '\n'
 	status int = 0
+	nVal int
+	chrs []rune
 )
 
-
-func
-usage() {
-	fmt.Fprintf(os.Stderr, "usage: %s [n_utf8_chars] [len]\n", arg0)
-	os.Exit(1)
-}
-
 func
 Pow(x, p int) int {
 	ret := 1 
@@ -46,10 +41,29 @@ func
 printPins(s []rune, l int) {
 	n := Pow(len(s), l)
 	for i:=0 ; i<n ; i++ {
-		fmt.Println(GetPin(s, l, i))
+		pin := GetPin(s, l, i)
+		if Fits([]rune(pin)) {
+			fmt.Println(GetPin(s, l, i))
+		}
 	}
 }
 
+func
+Fits(s []rune) bool {
+	a := make([]int, len(chrs))
+	for i, v1 := range chrs {
+		for _, v2 := range s {
+			if v1 == v2 {
+				a[i]++
+				if a[i] > nVal {
+					return false
+				}
+			}
+		}
+	}
+	return true
+}
+
 func
 Run(args []string) int {
 	arg0 = args[0]
@@ -58,14 +72,31 @@ Run(args []string) int {
 		"Add combinations with less number of chars starting with arg.")
 	flagSet.BoolVar(&Lflag, "L", false,
 		"Set less number to 1. Overrides l flag.")
+	flagSet.IntVar(&nVal, "n", 1, "Max repeats of the rune." )
 	flagSet.Parse(args[1:])
 	args = flagSet.Args()
-	if len(args) < 2 {
-		usage()
+	flagSet.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage of %s: %s [options] <tmpl_chars> [len]\n", arg0)
+		flagSet.PrintDefaults()
+		os.Exit(1)
+	}
+
+	var(
+		err error
+		n int
+	)
+
+	if len(args) == 0 {
+		flagSet.Usage()
+	}
+
+	chrs = []rune(args[0])
+	if len(args) == 2 {
+		n, err = strconv.Atoi(args[1])
+	} else if len(args) == 1 {
+		n = len(chrs)
 	}
 
-	chrs := []rune(args[0])
-	n, err := strconv.Atoi(args[1])
 	if err!=nil {
 		log.Fatal(err)
 	}
@@ -76,7 +107,7 @@ Run(args []string) int {
 
 	if lval != 0 {
 		if lval > n {
-			usage()
+			flagSet.Usage()
 		}
 		for i := lval ; i<=n ; i++ {
 			printPins(chrs, i)