2 files changed, 129 insertions, 0 deletions
diff --git a/source/lib/src/proto/command.cpp b/source/lib/src/proto/command.cpp
new file mode 100644
index 0000000..5a669f5
--- /dev/null
+++ b/source/lib/src/proto/command.cpp
@@ -0,0 +1,47 @@
+#include "wanda/proto/command.hpp"
+
+namespace wanda::proto
+{
+  std::optional<message> command::message() const
+  {
+    using namespace std::string_literals;
+    auto const command = [this] {
+      switch (id)
+      {
+        case command_id::change:
+          return "CHANGE"s;
+        default:
+          return ""s;
+      }
+    }();
+
+    auto argument_string = std::string{};
+    for (int index = 0ul; index < arguments.size(); ++index)
+    {
+      argument_string += (index) ? "," + arguments[index] : arguments[index];
+    }
+
+    if (command.empty())
+    {
+      return std::nullopt;
+    }
+
+    return wanda::proto::message{"C", command, argument_string};
+  }
+
+  std::optional<command> make_command(message message)
+  {
+    if (message.command == "CHANGE")
+    {
+      return {{command_id::change}};
+    }
+
+    return std::nullopt;
+  }
+
+  command make_change_command()
+  {
+    return {command_id::change};
+  }
+
+}  // namespace wanda::proto
+\ No newline at end of file
diff --git a/source/lib/src/proto/message.cpp b/source/lib/src/proto/message.cpp
new file mode 100644
index 0000000..f44ca06
--- /dev/null
+++ b/source/lib/src/proto/message.cpp
@@ -0,0 +1,82 @@
+#include "wanda/proto/message.hpp"
+
+#include <spdlog/common.h>
+
+#include <ios>
+#include <iterator>
+#include <sstream>
+
+namespace wanda::proto
+{
+  message::operator std::string() const
+  {
+    std::ostringstream buffer{};
+    buffer << source
+           << ':'
+           << command;
+    if (argument.has_value())
+    {
+      buffer << ':' << *argument;
+    }
+    return buffer.str();
+  }
+
+  std::size_t message::size() const
+  {
+    return static_cast<std::string>(*this).size();
+  }
+
+  template<typename InputIt, typename OutputIt, typename UnaryPredicate>
+  OutputIt copy_until(InputIt first, InputIt last, OutputIt out, UnaryPredicate predicate)
+  {
+    while (first != last && !predicate(*first))
+    {
+      *out++ = *first++;
+    }
+    return out;
+  }
+
+  std::istream & operator>>(std::istream & in, message & message)
+  {
+    auto pos = std::istream_iterator<char>{in};
+    auto end = std::istream_iterator<char>{};
+    auto buffer = std::string{};
+
+    copy_until(pos, end, std::back_inserter(buffer), [](auto const & c) { return c == ':'; });
+    if (in.eof() || buffer.size() != 1)
+    {
+      in.setstate(std::ios_base::failbit);
+      return in;
+    }
+    message.source = buffer;
+
+    buffer.clear();
+    copy_until(++pos, end, std::back_inserter(buffer), [](auto const & c) { return c == ':'; });
+    if (in.eof())
+    {
+      in.setstate(std::ios_base::failbit);
+    }
+    message.command = buffer;
+
+    buffer.clear();
+    copy(++pos, end, std::back_inserter(buffer));
+    if (buffer.size())
+    {
+      message.argument = std::optional{std::move(buffer)};
+    }
+
+    in.clear(in.rdstate() ^ std::ios_base::failbit);
+    return in;
+  }
+
+  std::ostream & operator<<(std::ostream & out, message const & message)
+  {
+    return out << static_cast<std::string>(message);
+  }
+
+}  // namespace wanda::proto
+
+auto spdlog::fmt_lib::formatter<wanda::proto::message>::format(wanda::proto::message const & message, format_context & context) const -> decltype(context.out())
+{
+  return formatter<std::string>::format(static_cast<std::string>(message), context);
+}