Fixes missing stream cleanup in emscripten builds

I did this months ago, just never committed it onto master for some reason.

.gitignore

@@ -374,3 +374,4 @@ Joao.exe
 
 ## Meson garbage
 builddir
+cross_wasm.txt

Args.cpp

@@ -106,7 +106,7 @@ static FailureOr try_run_expression(Program& prog, std::string&& expr_str) {
 //This means that we'll have to get kinda funky with it if we want to get user input w/o the front-end being a laggy, spinny, crashy mess.
 //
 //Make sure to use the -sASYNCIFY arg to em++ to make this work.
-//I'd add something to detect if you forget, but since it's a linker arg, the compiler doesn't get to know about that.
+//meson.build *SHOULD* have it as a default linker argument. Try not to override it or the whole binary may just, not work at runtime.
 static void detail_get_line(std::string& ret) 
 {
 	using std::cin;

Interpreter.cpp

@@ -99,6 +99,7 @@ void Interpreter::UncaughtRuntime(const Value& err)
 	throw err;
 #else
 	int code = err.t_value.as_object_ptr->get_property(*this, "code").t_value.as_int;
+	std::cout.flush();
 	if (code)
 		exit(code);
 	else

Parser.h

@@ -699,8 +699,8 @@ class Parser
 		if (t)
 			std::cout << t->dump();
 		else
-			std::cout << "Parser Error Error: No Token pointer provided to ParserError()!\n";
-
+			std::cout << "Parser Error Error: No Token pointer provided to ParserError()!";
+		std::cout << std::endl; // This is an emscripten thing. We need to make sure this is flushed.
 		if (!is_interactive)
 #ifdef JOAO_SAFE
 			throw error::parser(what);

docs/cross_wasm.txt

@@ -5,9 +5,9 @@ ar = 'WHEREEVER_IT_IS/emscripten/emar'
 
 [built-in options]
 c_args = []
-c_link_args = ['-sENVIRONMENT=web','-sASYNCIFY','--emrun', '-ojoao.html']
+c_link_args = ['-sENVIRONMENT=web','-sASYNCIFY', '-sEXIT_RUNTIME=1']
 cpp_args = []
-cpp_link_args = ['-sENVIRONMENT=web','-sASYNCIFY','--emrun', '-ojoao.html']
+cpp_link_args = ['-sENVIRONMENT=web','-sASYNCIFY', '-sEXIT_RUNTIME=1']
 
 [host_machine]
 

meson.build

@@ -42,8 +42,14 @@ configure_file(input : 'config.h.in', output : 'config.h',
 	'patch': version_parts[2],
   }
 )
-
-exe = executable('joao', nativefuncs + src)
+if build_machine.system() == 'emscripten'
+	exe =  executable('joao', nativefuncs + src,
+		cpp_args : [],
+		link_args : ['-sASYNCIFY']
+	)
+else
+	exe = executable('joao', nativefuncs + src)
+endif
 
 # Diagnostic tests
 diagnostics = [ #Meson has a philosophical disagreement with procedurally generating the list of files in a directory, so...