actually call the trade dialog

functions.lua

@@ -3050,6 +3050,11 @@ yl_speak_up.input_talk = function(player, formname, fields)
 
         local d_option = n_dialog.d_options[o]
 
+	-- which dialog do we have to show next? default: keep this one
+	local target_dialog = d_id
+	-- currently not trading; but a new trade may be started here
+	yl_speak_up.trade[pname] = nil
+
         -- Let's do something if results exist
         if d_option.o_results ~= nil then
             for k, v in pairs(d_option.o_results) do
@@ -3171,9 +3176,7 @@ yl_speak_up.input_talk = function(player, formname, fields)
                 end
                 if v.r_type == "dialog" then
                     if dialog.n_dialogs[v.r_value] ~= nil then
-                        -- if there are any changes done: ask first and don't switch to the new dialog yet
+                        target_dialog = v.r_value
-			yl_speak_up.save_changes_and_switch_to_other_dialog(player, fields, v.r_value)
-	                return
                     else
                         say("This dialog does not exist")
                     end
@@ -3181,6 +3184,46 @@ yl_speak_up.input_talk = function(player, formname, fields)
                 if v.r_type == "auto" then
                     say("auto forward")
                 end
+		if v.r_type == "trade" then
+			-- prepare a trade
+			-- TODO: this may not be a simple trade but instead a more complex one
+			yl_speak_up.trade[pname] = {
+				-- trade_simple is a fallback
+				trade_type = v.r_trade_type,
+				-- we will create a new trade
+				player_gives = v.r_player_gives,
+				npc_gives    = v.r_npc_gives,
+				-- can be determined from other variables, but it is easier to store it here
+				n_id = n_id,
+				npc_name = dialog.n_npc,
+				-- for statistics and in order to determine which dialog to show next
+				trade_done = 0,
+				-- we need to know which option this is
+				o_id = o,
+				-- we are iterateing over the results right now; the key k is what we need
+				r_id = k,
+				-- we do not know yet which target dialog to choose; it may have
+				-- shown up already or come later on in this loop
+				target_dialog = d_id,
+			}
+		end
+            end -- end of loop over d_option.o_results
+
+	    -- if there is a trade in the results/effects, show that trade now
+	    if(yl_speak_up.trade[pname]) then
+		-- we now know the right arget dialog for this trade
+		yl_speak_up.trade[pname].target_dialog = target_dialog
+		-- show the trade dialog
+		minetest.show_formspec(pname, "yl_speak_up:do_trade_simple",
+			yl_speak_up.get_fs_trade_simple(player))
+		return
+            end
+
+	    -- else switch to the target dialog as stated in results/effects
+	    if(target_dialog ~= d_id) then
+                -- if there are any changes done: ask first and don't switch to the new dialog yet
+                yl_speak_up.save_changes_and_switch_to_other_dialog(player, fields, target_dialog)
+                return
             end
         end
 end