some morse stuff added

src/CMakeLists.txt

@@ -3,5 +3,6 @@ target_sources(raspi_keyer PRIVATE
     settings.cpp
     keyer.cpp
     sidetone.cpp
+    morse.cpp
     usb_descriptors.c
 )

src/morse.cpp

@@ -0,0 +1,47 @@
+#include <algorithm>
+#include <map>
+#include <regex>
+
+#include "morse.h"
+
+std::map<char, std::string> morseCode = {
+    {'A', ".-"},     {'B', "-..."},    {'C', "-.-."},   {'D', "-.."},    {'E', "."},      {'F', "..-."},
+    {'G', "--."},    {'H', "...."},    {'I', ".."},     {'J', ".---"},   {'K', "-.-"},    {'L', ".-.."},
+    {'M', "--"},     {'N', "-."},      {'O', "---"},    {'P', ".--."},   {'Q', "--.-"},   {'R', ".-."},
+    {'S', "..."},    {'T', "-"},       {'U', "..-"},    {'V', "...-"},   {'W', ".--"},    {'X', "-..-"},
+    {'Y', "-.--"},   {'Z', "--.."},    {'1', ".----"},  {'2', "..---"},  {'3', "...--"},  {'4', "....-"},
+    {'5', "....."},  {'6', "-...."},   {'7', "--..."},  {'8', "---.."},  {'9', "----."},  {'0', "-----"},
+    {',', "--..--"}, {'.', ".-.-.-"},  {'?', "..--.."}, {'/', "-..-."},  {'-', "-....-"}, {':', "---..."},
+    {'&', ".-..."},  {'\'', ".----."}, {'@', ".--.-."}, {')', "-.--.-"}, {'(', "-.--."},  {'\"', ".-..-."},
+    {'=', "-...-"},  // '=' == <BT>
+    {'k', "-.--."},  // k == <KN>
+    {'s', "...-.-"}, // s == <SK>
+    {'+', ".-.-."},  // + == <AR>
+    {'a', "-.-.-"},  // a == <KA>
+};
+
+std::string refurbishMessage(const std::string &msg)
+{
+    std::string msgUpper;
+    msgUpper.resize(msg.length());
+
+    // Make the message all upper case
+    std::transform(msg.cbegin(), msg.cend(), msgUpper.begin(), [](unsigned char c) { return std::toupper(c); });
+
+    // Encode the special characters as we like it
+    msgUpper = std::regex_replace(msgUpper, std::regex("<BT>"), "=");
+    msgUpper = std::regex_replace(msgUpper, std::regex("<KN>"), "k");
+    msgUpper = std::regex_replace(msgUpper, std::regex("<SK>"), "s");
+    msgUpper = std::regex_replace(msgUpper, std::regex("<AR>"), "+");
+    msgUpper = std::regex_replace(msgUpper, std::regex("<KA>"), "a");
+
+    // Remove all other unknown characters
+    msgUpper.erase(remove_if(msgUpper.begin(), msgUpper.end(),
+                             [](const char &c) { return c != ' ' && morseCode.find(c) == morseCode.end(); }),
+                   msgUpper.end());
+
+    // Remove spaces, if there are too many of them
+    msgUpper = std::regex_replace(msgUpper, std::regex("(\\s+)"), " ");
+
+    return msgUpper;
+}

src/morse.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <string>
+
+std::string refurbishMessage(const std::string msg);