add simple cmd handler

main.cpp

@@ -1,6 +1,9 @@
 #include <stm32f1xx_hal.h>
 #include <stm32f1xx_hal_uart.h>
 
+#include <array>
+#include <tuple>
+
 #include "logging.hpp"
 #include "spi.hpp"
 
@@ -22,6 +25,72 @@
 extern uint8_t LoRa_buff[RH_RF95_FIFO_SIZE];
 extern SPI_HandleTypeDef hspi1;
 
+void print_version(void) { log::info("running PentaTrack v0.1.3"); }
+
+class cmd_holder {
+ public:
+  typedef void (*functionPointerType)(void);
+
+  void add_cmd(std::string_view msg, functionPointerType func) {
+    commands[amount_cmds++] = std::make_tuple(msg, func);
+  }
+
+  functionPointerType get_func(std::string_view message) const {
+    for (const auto &[msg, func] : commands) {
+      if (message == msg) {
+        return func;
+      }
+    }
+
+    return nullptr;
+  }
+
+ private:
+  std::array<std::tuple<std::string_view, functionPointerType>, 12> commands;
+  size_t amount_cmds = 0;
+};
+
+class cmd_handler {
+ public:
+  using array_t = std::array<uint8_t, 24>;
+  using iterator_t = array_t::iterator;
+  using const_iterator_t = array_t::const_iterator;
+
+  cmd_handler() : symbols{}, iterator{symbols.begin()} {
+    commands.add_cmd("ver", &print_version);
+  }
+
+  static cmd_handler *get_instance() {
+    static cmd_handler handler{};
+
+    return &handler;
+  }
+
+  void add_symbol(uint8_t symbol) {
+    *iterator++ = symbol;
+    if (iterator == symbols.end()) {
+      iterator = symbols.begin();
+    }
+  }
+
+  std::string_view get_current_cmd() const {
+    return {reinterpret_cast<const char *>(symbols.data()),
+            static_cast<size_t>(
+                std::distance(symbols.begin(), const_iterator_t{iterator}))};
+  }
+
+  void log_current_command() { log::debug(get_current_cmd()); }
+
+ private:
+  cmd_holder commands;
+
+  array_t symbols;
+  iterator_t iterator;
+};
+
+// cmd_handler::array_t cmd_handler::symbols = cmd_handler::array_t{};
+// cmd_handler::iterator_t cmd_handler::iterator = cmd_handler::iterator_t{};
+
 // This prevent name mangling for functions used in C/assembly files.
 extern "C" {
 void SysTick_Handler(void) {