From f3a63fb85bb938dcb52215057206915c23c51296 Mon Sep 17 00:00:00 2001
From: k1574 <k1574@yandex.ru>
Date: Sun, 30 Aug 2020 02:46:11 +0500
Subject: [PATCH] pin: simple implementation added.

---
 main.go    |  2 ++
 pin/pin.go | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 pin/pin.go

diff --git a/main.go b/main.go
index 9a4885f..b5680e3 100644
--- a/main.go
+++ b/main.go
@@ -4,6 +4,7 @@ import(
 	"fmt"
 	"os"
 	"github.com/k1574/utf8tmpl/tmpl"
+	"github.com/k1574/utf8tmpl/pin"
 )
 
 func main() {
@@ -15,6 +16,7 @@ func main() {
 
 	utilsMap := map[string]  interface{}  {
 		"tmpl" : tmpl.Run,
+		"pin" : pin.Run,
 	}
 
 	if len(os.Args)<2  {
diff --git a/pin/pin.go b/pin/pin.go
new file mode 100644
index 0000000..f6ade11
--- /dev/null
+++ b/pin/pin.go
@@ -0,0 +1,67 @@
+package pin
+
+import(
+	"os"
+	"fmt"
+	"strconv"
+	"log"
+)
+
+var(
+	arg0 string
+	delim rune = '\n'
+	status int = 0
+)
+
+
+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 
+	for i:=0 ; i<p ; i++ {
+		ret *= x
+	}
+	return ret
+}
+
+func
+GetPin(s []rune, l int, i int) string {
+	ret := ""
+	slen := len(s)
+	for j:=0 ; j<l ; j++ {
+		ret += string(s[ ( i/Pow(slen, j) ) % slen] )
+	}
+	return ret
+}
+
+func
+printPins(s []rune, l int) {
+	n := Pow(len(s), l)
+	for i:=0 ; i<n ; i++ {
+		fmt.Println(GetPin(s, l, i))
+	}
+}
+
+func
+Run(args []string) int {
+	arg0 = args[0]
+
+	if len(args) < 3 {
+		usage()
+	}
+
+	chrs := []rune(args[1])
+	n, err := strconv.Atoi(args[2])
+	if err!=nil {
+		log.Fatal(err)
+	}
+
+	printPins(chrs, n)
+
+	return status
+}