Add Lua errors to error dialog

builtin/fstk/ui.lua

@@ -60,11 +60,33 @@ function ui.update()
 
 	-- handle errors
 	if gamedata ~= nil and gamedata.errormessage ~= nil then
-		formspec = "size[12,3.2]" ..
-			"textarea[1,1;10,2;;ERROR: " ..
-			core.formspec_escape(gamedata.errormessage) ..
-			";]"..
-			"button[4.5,2.5;3,0.5;btn_error_confirm;" .. fgettext("Ok") .. "]"
+		local ar = gamedata.errormessage:split("\n")
+		for i = 1, #ar do
+			local text = ar[i]
+			-- Hack to add word wrapping.
+			-- TODO: Add engine support for wrapping in formspecs
+			while #text > 80 do
+				if formspec ~= "" then
+					formspec = formspec .. ","
+				end
+				formspec = formspec .. core.formspec_escape(string.sub(text, 1, 79))
+				text = string.sub(text, 80, #text)
+			end
+			if formspec ~= "" then
+				formspec = formspec .. ","
+			end
+			formspec = formspec .. core.formspec_escape(text)
+		end
+		local error_title
+		if string.find(gamedata.errormessage, "ModError") then
+			error_title = fgettext("An error occured in a Lua script, such as a mod:")
+		else
+			error_title = fgettext("An error occured:")
+		end
+		formspec = "size[12,5]" ..
+				"label[0.5,0;" .. error_title ..
+				"]textlist[0.2,0.8;11.5,3.5;;" .. formspec ..
+				"]button[4.5,4.6;3,0.5;btn_error_confirm;" .. fgettext("Ok") .. "]"
 	else
 		local active_toplevel_ui_elements = 0
 		for key,value in pairs(ui.childlist) do

src/script/cpp_api/s_base.cpp

@@ -119,14 +119,14 @@ ScriptApiBase::~ScriptApiBase()
 }
 
 bool ScriptApiBase::loadMod(const std::string &script_path,
-		const std::string &mod_name)
+		const std::string &mod_name, std::string *error)
 {
 	ModNameStorer mod_name_storer(getStack(), mod_name);
 
-	return loadScript(script_path);
+	return loadScript(script_path, error);
 }
 
-bool ScriptApiBase::loadScript(const std::string &script_path)
+bool ScriptApiBase::loadScript(const std::string &script_path, std::string *error)
 {
 	verbosestream << "Loading and running script from " << script_path << std::endl;
 
@@ -140,13 +140,14 @@ bool ScriptApiBase::loadScript(const std::string &script_path)
 	}
 	ok = ok && !lua_pcall(L, 0, 0, m_errorhandler);
 	if (!ok) {
-		errorstream << "========== ERROR FROM LUA ===========" << std::endl;
-		errorstream << "Failed to load and run script from " << std::endl;
-		errorstream << script_path << ":" << std::endl;
-		errorstream << std::endl;
-		errorstream << lua_tostring(L, -1) << std::endl;
-		errorstream << std::endl;
-		errorstream << "======= END OF ERROR FROM LUA ========" << std::endl;
+		std::string error_msg = lua_tostring(L, -1);
+		if (error)
+			(*error) = error_msg;
+		errorstream << "========== ERROR FROM LUA ===========" << std::endl
+			<< "Failed to load and run script from " << std::endl
+			<< script_path << ":" << std::endl << std::endl
+			<< error_msg << std::endl << std::endl
+			<< "======= END OF ERROR FROM LUA ========" << std::endl;
 		lua_pop(L, 1); // Pop error message from stack
 		return false;
 	}
@@ -268,4 +269,3 @@ void ScriptApiBase::objectrefGet(lua_State *L, u16 id)
 	lua_remove(L, -2); // object_refs
 	lua_remove(L, -2); // core
 }
-

src/script/cpp_api/s_base.h

@@ -51,8 +51,8 @@ public:
 	ScriptApiBase();
 	virtual ~ScriptApiBase();
 
-	bool loadMod(const std::string &script_path, const std::string &mod_name);
-	bool loadScript(const std::string &script_path);
+	bool loadMod(const std::string &script_path, const std::string &mod_name, std::string *error=NULL);
+	bool loadScript(const std::string &script_path, std::string *error=NULL);
 
 	/* object */
 	void addObjectReference(ServerActiveObject *cobj);

src/server.cpp

@@ -239,11 +239,9 @@ Server::Server(
 	m_mods = modconf.getMods();
 	std::vector<ModSpec> unsatisfied_mods = modconf.getUnsatisfiedMods();
 	// complain about mods with unsatisfied dependencies
-	if(!modconf.isConsistent())
-	{
+	if(!modconf.isConsistent()) {
 		for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
-			it != unsatisfied_mods.end(); ++it)
-		{
+			it != unsatisfied_mods.end(); ++it) {
 			ModSpec mod = *it;
 			errorstream << "mod \"" << mod.name << "\" has unsatisfied dependencies: ";
 			for(std::set<std::string>::iterator dep_it = mod.unsatisfied_depends.begin();
@@ -259,8 +257,7 @@ Server::Server(
 	std::vector<std::string> names = worldmt_settings.getNames();
 	std::set<std::string> load_mod_names;
 	for(std::vector<std::string>::iterator it = names.begin();
-		it != names.end(); ++it)
-	{
+		it != names.end(); ++it) {
 		std::string name = *it;
 		if(name.compare(0,9,"load_mod_")==0 && worldmt_settings.getBool(name))
 			load_mod_names.insert(name.substr(9));
@@ -272,8 +269,7 @@ Server::Server(
 	for(std::vector<ModSpec>::iterator it = unsatisfied_mods.begin();
 			it != unsatisfied_mods.end(); ++it)
 		load_mod_names.erase((*it).name);
-	if(!load_mod_names.empty())
-	{
+	if(!load_mod_names.empty()) {
 		errorstream << "The following mods could not be found:";
 		for(std::set<std::string>::iterator it = load_mod_names.begin();
 			it != load_mod_names.end(); ++it)
@@ -296,10 +292,11 @@ Server::Server(
 	m_script = new GameScripting(this);
 
 	std::string script_path = getBuiltinLuaPath() + DIR_DELIM "init.lua";
+	std::string error_msg;
 
-	if (!m_script->loadMod(script_path, BUILTIN_MOD_NAME)) {
-		throw ModError("Failed to load and run " + script_path);
-	}
+	if (!m_script->loadMod(script_path, BUILTIN_MOD_NAME, &error_msg))
+		throw ModError("Failed to load and run " + script_path
+				+ "\nError from Lua:\n" + error_msg);
 
 	// Print mods
 	infostream << "Server: Loading mods: ";
@@ -314,18 +311,21 @@ Server::Server(
 			i != m_mods.end(); i++) {
 		const ModSpec &mod = *i;
 		if (!string_allowed(mod.name, MODNAME_ALLOWED_CHARS)) {
-			errorstream << "Error loading mod \"" << mod.name
+			std::ostringstream err;
+			err << "Error loading mod \"" << mod.name
 					<< "\": mod_name does not follow naming conventions: "
 					<< "Only chararacters [a-z0-9_] are allowed." << std::endl;
-			throw ModError("Mod \"" + mod.name + "\" does not follow naming conventions.");
+			errorstream << err.str().c_str();
+			throw ModError(err.str());
 		}
 		std::string script_path = mod.path + DIR_DELIM "init.lua";
 		infostream << "  [" << padStringRight(mod.name, 12) << "] [\""
 				<< script_path << "\"]" << std::endl;
-		if (!m_script->loadMod(script_path, mod.name)) {
+		if (!m_script->loadMod(script_path, mod.name, &error_msg)) {
 			errorstream << "Server: Failed to load and run "
 					<< script_path << std::endl;
-			throw ModError("Failed to load and run " + script_path);
+			throw ModError("Failed to load and run " + script_path
+					+ "\nError from Lua:\n" + error_msg);
 		}
 	}