Added basic message encoder

.gitignore

@@ -1,5 +1,6 @@
 /locbackup
 /numberstation
+/nsencode
 /build
 /bin
 

nsencoder.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+func main() {
+	// Define the shift and hex flags
+	shift := flag.Int("s", 0, "Shift value for alphabet positions (can be negative)")
+	useHex := flag.Bool("x", false, "Encode numbers in hexadecimal")
+	flag.Parse()
+
+	// Check if input is being piped or passed as an argument
+	stat, _ := os.Stdin.Stat()
+	if (stat.Mode() & os.ModeCharDevice) != 0 {
+		// No input, display help text
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	// Read input from stdin
+	inputBytes, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Println("Error reading input:", err)
+		os.Exit(1)
+	}
+	input := strings.TrimSpace(string(inputBytes))
+
+	// Convert input to uppercase and prepare the result slice
+	input = strings.ToUpper(input)
+	var result []string
+	var currentNumber string
+
+	for _, char := range input {
+		if unicode.IsLetter(char) {
+			// If there was a number being processed, add it to the result first
+			if currentNumber != "" {
+				appendNumber(&result, currentNumber, *useHex)
+				currentNumber = ""
+			}
+			// Get the position of the character in the alphabet (A = 1, B = 2, ..., Z = 26)
+			position := int(char - 'A' + 1)
+			// Apply the shift, wrapping around the alphabet
+			shiftedPosition := (position + *shift - 1) % 26
+			if shiftedPosition < 0 {
+				shiftedPosition += 26
+			}
+			shiftedPosition += 1
+
+			// Append the shifted position to the result slice
+			result = append(result, fmt.Sprintf("%02d", shiftedPosition))
+		} else if unicode.IsDigit(char) {
+			// Collect digits to process as a whole number
+			currentNumber += string(char)
+		} else {
+			// If there was a number being processed and now a non-digit/non-letter appears, append it
+			if currentNumber != "" {
+				appendNumber(&result, currentNumber, *useHex)
+				currentNumber = ""
+			}
+		}
+	}
+
+	// If there's any remaining number at the end of the input, append it
+	if currentNumber != "" {
+		appendNumber(&result, currentNumber, *useHex)
+	}
+
+	// Join the result slice into a space-separated string and print it
+	fmt.Println(strings.Join(result, " "))
+}
+
+// appendNumber appends a formatted number to the result slice
+func appendNumber(result *[]string, number string, useHex bool) {
+	if useHex {
+		num, err := strconv.Atoi(number)
+		if err == nil {
+			*result = append(*result, fmt.Sprintf("0x%X", num))
+		}
+	} else {
+		*result = append(*result, "0d"+number)
+	}
+}
+