Platform_Win32Console: Actually handle Unicode filenames correctly -.-

Right, we do in fact have to do the conversion at compile time.

Platform_Win32Console.cpp

@@ -4,6 +4,12 @@
 // Since we need std::min() and std::max()...
 #define NOMINMAX
 
+// Unicode WFILE macro
+// https://stackoverflow.com/a/3291315/5035474
+#define WIDEN2(x) L ## x
+#define WIDEN(x) WIDEN2(x)
+#define WFILE WIDEN(__FILE__)
+
 #include <numeric>
 #include <sstream>
 #include <vector>
@@ -17,7 +23,7 @@ void fatal(std::wstring_view message)
 }
 
 void fatal_from_lasterror(
-	std::string_view file, unsigned int line, DWORD lasterror
+	std::wstring_view file, unsigned int line, DWORD lasterror
 )
 {
 	auto fail = [lasterror]() {
@@ -46,25 +52,8 @@ void fatal_from_lasterror(
 		fail();
 	}
 
-	// std::wstring_convert is deprecated... So, MultiByteToWideChar it is.
-	int file_len = static_cast<int>(file.size());
-	int file_utf16_len = MultiByteToWideChar(
-		CP_UTF8, 0, file.data(), file_len, nullptr, 0
-	);
-	if(file_utf16_len == 0) {
-		fail();
-	}
-
-	// The terminating '\0' is already included here.
-	std::wstring file_utf16(file_utf16_len, '\0');
-	if(!MultiByteToWideChar(
-		CP_UTF8, 0, file.data(), file_len, file_utf16.data(), file_utf16_len
-	)) {
-		fail();
-	}
-
 	std::wstringstream message;
-	message << file_utf16 << ":" << std::to_wstring(line) << ": " << formatted;
+	message << file << ":" << std::to_wstring(line) << ": " << formatted;
 	fatal(message.str());
 }
 
@@ -78,7 +67,7 @@ std::unordered_set<char> Platform_Win32Console::get_input(void)
 
 	DWORD events_available;
 	if(!GetNumberOfConsoleInputEvents(handle_in, &events_available)) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	// ReadConsoleInput blocks if we have no events. So, don't even call it
@@ -93,7 +82,7 @@ std::unordered_set<char> Platform_Win32Console::get_input(void)
 	if(!ReadConsoleInput(
 		handle_in, input_records.data(), events_available, &events_read
 	)) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	for(auto const &record : input_records) {
@@ -201,22 +190,22 @@ Platform_Win32Console Platform_Win32Console::init()
 	// Make sure to create a dedicated window, even if we launch from a shell
 	FreeConsole(); // We don't care if this fails
 	if(!AllocConsole()) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	auto handle_out = GetStdHandle(STD_OUTPUT_HANDLE);
 	if(handle_out == INVALID_HANDLE_VALUE) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	auto handle_in = GetStdHandle(STD_INPUT_HANDLE);
 	if(handle_in == INVALID_HANDLE_VALUE) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	CONSOLE_FONT_INFOEX cfi = { sizeof(CONSOLE_FONT_INFOEX) };
 	if(!GetCurrentConsoleFontEx(handle_out, false, &cfi)) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	// Make sure to enforce a default Windows font that actually has U+2580
@@ -225,7 +214,7 @@ Platform_Win32Console Platform_Win32Console::init()
 	cfi.dwFontSize.X = 4;
 	cfi.dwFontSize.Y = 4;
 	if(!SetCurrentConsoleFontEx(handle_out, false, &cfi)) {
-		fatal_from_lasterror(__FILE__, __LINE__, GetLastError());
+		fatal_from_lasterror(WFILE, __LINE__, GetLastError());
 	}
 
 	CONSOLE_CURSOR_INFO cursor_info = { 1, false };