Lua: Some fixes related to sysrc.lua

- Detect syntax errors in sysrc.lua and abort compile
- Print special errors for parse errors on sysrc.lua (if above fails).
- Print errors from sysrc.lua specially.

buildaux/txt2cstr.cpp

@@ -42,7 +42,7 @@ struct encoder
 			}
 			i++;
 		}
-		output << out.str() << std::endl;
+		output << out.str();
 		return i;
 	}
 	size_t operator()()

src/lua/Makefile

@@ -7,6 +7,7 @@ __all__.files: $(OBJECTS)
 	echo >__all__.ldflags
 
 sysrc.cpp: sysrc.lua
+	luac -p $<
 	../../buildaux/txt2cstr.exe lua_sysrc_script $< >$@
 
 sysrc.cpp.dep: sysrc.cpp

src/lua/lua.cpp

@@ -124,6 +124,8 @@ namespace
 
 #define TEMPORARY "LUAINTERP_INTERNAL_COMMAND_TEMPORARY"
 
+	const char* eval_sysrc_lua = "local fn = loadstring(" TEMPORARY ", \"<built-in>\"); if fn then fn(); else "
+		"print2(\"Parse error in sysrc.lua script\"); end;";
 	const char* eval_lua_lua = "local fn = loadstring(" TEMPORARY "); if fn then fn(); else print("
 		"\"Parse error in Lua statement\"); end;";
 	const char* run_lua_lua = "dofile(" TEMPORARY ");";
@@ -245,7 +247,10 @@ namespace
 
 	void run_sysrc_lua(lua::state& L)
 	{
-		do_eval_lua(L, lua_sysrc_script);
+		L.pushstring(lua_sysrc_script);
+		L.setglobal(TEMPORARY);
+		luareader_fragment = eval_sysrc_lua;
+		run_lua_fragment(L);
 	}
 
 	void run_synchronous_paint(struct lua_render_context* ctx)