options can now be marked as Done when having been visited once

editor/edit_mode_apply_changes.lua

@@ -386,6 +386,27 @@ yl_speak_up.edit_mode_apply_changes = function(pname, fields)
 		d_option.o_text_when_prerequisites_not_met = fields.option_text_not_met
 	end
 
+	-- toggle visit often/only *once*
+	if(d_option and fields.option_visits and fields.option_visits ~= "") then
+		local old_visit_mode = "often"
+		if(d_option.o_visit_only_once and d_option.o_visit_only_once == 1) then
+			old_visit_mode = "*once*"
+		end
+		if(fields.option_visits ~= old_visit_mode) then
+			if(fields.option_visits == "often") then
+				d_option.o_visit_only_once = 0
+				table.insert(yl_speak_up.npc_was_changed[ n_id ],
+					"Dialog "..d_id..": Option "..tostring(o_id)..
+					" can now be visited often/unlimited (default).")
+			elseif(fields.option_visits == "*once*") then
+				d_option.o_visit_only_once = 1
+				table.insert(yl_speak_up.npc_was_changed[ n_id ],
+					"Dialog "..d_id..": Option "..tostring(o_id)..
+					" can now be visited only *once* per talk.")
+			end
+		end
+	end
+
 	-- toggle autoselection/autoclick of an option
 	if(d_option and fields.option_autoanswer and fields.option_autoanswer ~= "") then
 		local old_answer_mode = "by clicking on it"
@@ -394,7 +415,7 @@ yl_speak_up.edit_mode_apply_changes = function(pname, fields)
 		elseif(d_option.o_autoanswer and d_option.o_autoanswer == 1) then
 			old_answer_mode = "automaticly"
 		end
-		if(fields.otpion_autoanswer ~= old_answer_mode) then
+		if(fields.option_autoanswer ~= old_answer_mode) then
 			local new_answer_mode = ""
 			if(fields.option_autoanswer == "by clicking on it") then
 				d_option.o_autoanswer = nil

editor/fs/fs_edit_options_dialog.lua

@@ -271,11 +271,25 @@ yl_speak_up.get_fs_edit_option_dialog = function(player, n_id, d_id, o_id, calle
 		answer_mode = 2
 	end
 
+	-- show an option only once
+	local visit_only_once = 0
+	if(d_option.o_visit_only_once and d_option.o_visit_only_once == 1) then
+		visit_only_once = 1
+	end
+
 	local answer_text =
 		-- answer of the player (the actual option)
 		"container[0.0,8.3]"..
 		"label[0.2,0.0;..the player may answer with this text"..
 			minetest.formspec_escape(" [dialog option \""..tostring(o_id).."\"]:").."]"..
+		"dropdown[13.3,-0.4;2.5,0.7;option_visits;"..
+			"often,*once*;"..tostring(visit_only_once + 1)..";]"..
+		"tooltip[option_visits;\"often\" allows to select this option whenever the\n"..
+				"\tpreconditions are fulfilled.\n"..
+				"\"*once*\" greys out the option after it has been selected\n"..
+				"\tone time successfully.\n"..
+				"Useful for visually marking options as read for the player.\n"..
+				"Talking to the NPC anew resets this option and it can be selected again.]"..
 		"dropdown[16.0,-0.4;5.3,0.7;option_autoanswer;"..
 			"by clicking on it,automaticly,randomly;"..tostring(answer_mode+1)..";]"
 			-- (automaticly *by fulfilling the prerequirements*)

editor/fs/fs_talkdialog_edit_mode.lua

@@ -451,11 +451,18 @@ yl_speak_up.get_fs_talkdialog_line = function(
 	end
 	-- add a button "-> d_<nr>" that leads to the target dialog (if one is set)
 	-- selecting an option this way MUST NOT execute the pre(C)onditions or (Ef)fects!
+	local arrow = "->"
+	local only_once = ""
+	if(sb_v.o_visit_only_once and sb_v.o_visit_only_once == 1) then
+		arrow = "*"
+		only_once = "\nNote: This option can be selected only *once* per talk!"
+	end
 	yl_speak_up.add_formspec_element_with_tooltip_if(formspec,
 		"button", tostring(9.6+offset)..","..h..";1,0.9", "button_" .. oid,
-		"->",
+		arrow,
 		"Go to target dialog "..minetest.formspec_escape(target_dialog or "")..
-			" that will be shown when this option ("..oid..") is selected.",
+			" that will be shown when this option ("..oid..") is selected."..
+			only_once,
 		(target_dialog))
 
 	-- allow to set a new target dialog

fs/fs_talkdialog.lua

@@ -224,7 +224,13 @@ yl_speak_up.get_fs_talkdialog_line = function(
 			sb_v.o_text_when_prerequisites_not_met, dialog, pname))
 	end
 	if(t or t_alt) then
-		-- if(t) then t = "Visits: "..tostring(sb_v.visits or 0).." "..tostring(t) end
+		-- some options can be visited only once; talking to the NPC anew resets that
+		-- (not stored persistently)
+		if(t and sb_v.visits and sb_v.visits > 0
+		    and sb_v.o_visit_only_once and sb_v.o_visit_only_once == 1) then
+			t_alt = minetest.formspec_escape("[Done] ")..t
+			t = nil
+		end
 		-- actually show the button
 		h = yl_speak_up.add_edit_button_fs_talkdialog(formspec, h,
 			"button_" .. oid,