this is insane but sure

src/log.cpp

@@ -1,5 +1,7 @@
 #include "log.h"
 
+#include <filesystem>
+#include <iterator>
 #include <print>
 
 #include "sdl.h"
@@ -9,6 +11,37 @@ using namespace anm2ed::util;
 
 namespace anm2ed
 {
+  namespace
+  {
+    bool ensure_utf8_bom(const std::filesystem::path& path)
+    {
+      std::error_code ec{};
+      if (!std::filesystem::exists(path, ec)) return false;
+
+      std::ifstream existing(path, std::ios::binary);
+      if (!existing) return false;
+
+      char bom[3]{};
+      existing.read(bom, sizeof(bom));
+      auto bytesRead = existing.gcount();
+      auto hasBom = bytesRead == sizeof(bom) && bom[0] == '\xEF' && bom[1] == '\xBB' && bom[2] == '\xBF';
+      if (hasBom) return true;
+
+      existing.clear();
+      existing.seekg(0, std::ios::beg);
+      std::string contents((std::istreambuf_iterator<char>(existing)), std::istreambuf_iterator<char>());
+      existing.close();
+
+      std::ofstream output(path, std::ios::binary | std::ios::trunc);
+      if (!output) return false;
+      output << "\xEF\xBB\xBF";
+      output.write(contents.data(), static_cast<std::streamsize>(contents.size()));
+      output.close();
+
+      return true;
+    }
+  }
+
   void Logger::write_raw(const std::string& message)
   {
     std::println("{}", message);
@@ -26,7 +59,17 @@ namespace anm2ed
   void Logger::error(const std::string& message) { write(ERROR, message); }
   void Logger::fatal(const std::string& message) { write(FATAL, message); }
   void Logger::command(const std::string& message) { write(COMMAND, message); }
-  void Logger::open(const std::filesystem::path& path) { file.open(path, std::ios::out | std::ios::app); }
+  void Logger::open(const std::filesystem::path& path)
+  {
+    std::error_code ec{};
+    auto exists = std::filesystem::exists(path, ec);
+    if (exists) ensure_utf8_bom(path);
+
+    file.open(path, std::ios::out | std::ios::app);
+    if (!file.is_open()) return;
+
+    if (!exists) file << "\xEF\xBB\xBF";
+  }
 
   std::filesystem::path Logger::path() { return sdl::preferences_directory_get() / "log.txt"; }
 

src/render.cpp

@@ -1,11 +1,17 @@
 #include "render.h"
 
+#include <cstddef>
+#include <cstdint>
 #include <cstring>
 #include <filesystem>
 #include <format>
 #include <fstream>
 #include <string>
 
+#if _WIN32
+  #include <windows.h>
+#endif
+
 #include "log.h"
 #include "process_.h"
 #include "sdl.h"
@@ -109,28 +115,55 @@ namespace anm2ed
     command += " 2>&1";
 
 #if _WIN32
-    auto escape_double_quotes_for_cmd = [](const std::string& input)
+    auto logCommand =
+        std::string("& ") + command + " | Tee-Object -FilePath " + string::quote(loggerPathString) + " -Append";
+    logger.command(logCommand);
+
+    auto utf8_to_wstring = [](const std::string& value)
     {
-      std::string escaped{};
-      escaped.reserve(input.size() * 2);
-      for (char character : input)
-      {
-        if (character == '"')
-          escaped += "\"\"";
-        else
-          escaped += character;
-      }
-      return escaped;
+      if (value.empty()) return std::wstring{};
+      auto length = MultiByteToWideChar(CP_UTF8, 0, value.c_str(), -1, nullptr, 0);
+      if (length <= 0) return std::wstring{};
+      std::wstring wide(static_cast<std::size_t>(length - 1), L'\0');
+      MultiByteToWideChar(CP_UTF8, 0, value.c_str(), -1, wide.data(), length);
+      return wide;
     };
 
-    auto powershellScript =
-        std::string("& { & ") + command + " | Tee-Object -FilePath " + string::quote(loggerPathString) + " -Append }";
-    command = "powershell -Command \"" + escape_double_quotes_for_cmd(powershellScript) + "\"";
+    auto base64_encode_utf16 = [](const std::wstring& input)
+    {
+      const auto* bytes = reinterpret_cast<const unsigned char*>(input.c_str());
+      auto length = input.size() * sizeof(wchar_t);
+      static constexpr char alphabet[] =
+          "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+      std::string encoded{};
+      encoded.reserve(((length + 2) / 3) * 4);
+
+      for (std::size_t i = 0; i < length;)
+      {
+        auto remaining = length - i;
+        auto octetA = bytes[i++];
+        auto octetB = remaining > 1 ? bytes[i++] : 0;
+        auto octetC = remaining > 2 ? bytes[i++] : 0;
+
+        auto triple = (static_cast<uint32_t>(octetA) << 16) | (static_cast<uint32_t>(octetB) << 8) |
+                      static_cast<uint32_t>(octetC);
+
+        encoded.push_back(alphabet[(triple >> 18) & 0x3F]);
+        encoded.push_back(alphabet[(triple >> 12) & 0x3F]);
+        encoded.push_back(remaining > 1 ? alphabet[(triple >> 6) & 0x3F] : '=');
+        encoded.push_back(remaining > 2 ? alphabet[triple & 0x3F] : '=');
+      }
+
+      return encoded;
+    };
+
+    auto script = std::wstring(L"& { ") + utf8_to_wstring(logCommand) + L" }";
+    auto encodedCommand = base64_encode_utf16(script);
+    command = "powershell -NoProfile -EncodedCommand " + string::quote(encodedCommand);
 #else
     command += " | tee -a " + string::quote(loggerPathString);
-#endif
-
     logger.command(command);
+#endif
 
     Process process(command.c_str(), "w");