Help with shop npc script

[tarantonio]

I want to make an npc that buy/sell items, but I don't want to use npc libs, I want to code the shop into npc lua script.

I need help with the amount of items to buy/sell.

Example:

player: sell 3 serpent swords
npc: do you want to sell 3 serpent swords?

How do I manage the amount (3 in this example) in the lua script?

 

[Xikini]

I had trouble with this as well, and opted to ask the player step by step what they wanted to do.

Player: serpent sword
NPC: would you like to buy or sell a serpent sword?
Player: sell
NPC: how many would you like to sell?
Player: 3
NPC: Would you like to sell 3 serpent swords for 2550 gold?
Player: yes
NPC: Thank you for your patronage!

-- Edit
and I just made a table of all available items for that specific npc, then they just guide the player through the rest.

I'm only a mediocre scripter though. :/

 

[R.yan]

 local sellable_items = {
                ["serpent sword"] = {Money = 1000, ItemId = 9999},
                }

            for v in pairs(sellable_items) do
             if (msgcontains(msg:lower(),'sell')) and (getCount(msg) > 1) and (msgcontains(msg, v)) and (npcHandler.focus == cid) then
                Count = getCount(msg)
                ItemId = sellable_items[v].ItemId
                Money = sellable_items[v].Money
                npcHandler:say('Do you want to sell '..Count..' '..getItemNameById(sellable_items[v].ItemId)..'s for '..sellable_items[v].Money*Count..' gold?')
                npcHandler:doTopic(cid, 2)

             elseif(msgcontains(msg:lower(),'sell')) and (msgcontains(msg, v)) and (npcHandler.focus == cid) then
                Count = 1
                ItemId = sellable_items[v].ItemId
                Money = sellable_items[v].Money
                npcHandler:say('Do you want to sell a '..getItemNameById(sellable_items[v].ItemId)..' for '..sellable_items[v].Money..' gold?')
                npcHandler:doTopic(cid, 2)
             end
            end

             if (msgcontains(msg:lower(),'yes')) and (npcHandler.Topic == 2) and (npcHandler.focus == cid) then
                    if (doPlayerRemoveItem(cid,ItemId,Count)) then
                        doPlayerAddMoney(cid,Count*Money)
                        npcHandler:say('Ok. Here is your gold.')
                    else
                     if  (Count > 1) then
                        npcHandler:say("You don't have that many.")
                     else
                        npcHandler:say("You don't have one.")
                     end
                    end
                end
                        npcHandler:doTopic(cid, 0)
             end

something like that

 

[tarantonio]

 local sellable_items = {
                ["serpent sword"] = {Money = 1000, ItemId = 9999},
                }

            for v in pairs(sellable_items) do
             if (msgcontains(msg:lower(),'sell')) and (getCount(msg) > 1) and (msgcontains(msg, v)) and (npcHandler.focus == cid) then
                Count = getCount(msg)
                ItemId = sellable_items[v].ItemId
                Money = sellable_items[v].Money
                npcHandler:say('Do you want to sell '..Count..' '..getItemNameById(sellable_items[v].ItemId)..'s for '..sellable_items[v].Money*Count..' gold?')
                npcHandler:doTopic(cid, 2)

             elseif(msgcontains(msg:lower(),'sell')) and (msgcontains(msg, v)) and (npcHandler.focus == cid) then
                Count = 1
                ItemId = sellable_items[v].ItemId
                Money = sellable_items[v].Money
                npcHandler:say('Do you want to sell a '..getItemNameById(sellable_items[v].ItemId)..' for '..sellable_items[v].Money..' gold?')
                npcHandler:doTopic(cid, 2)
             end
            end

             if (msgcontains(msg:lower(),'yes')) and (npcHandler.Topic == 2) and (npcHandler.focus == cid) then
                    if (doPlayerRemoveItem(cid,ItemId,Count)) then
                        doPlayerAddMoney(cid,Count*Money)
                        npcHandler:say('Ok. Here is your gold.')
                    else
                     if  (Count > 1) then
                        npcHandler:say("You don't have that many.")
                     else
                        npcHandler:say("You don't have one.")
                     end
                    end
                end
                        npcHandler:doTopic(cid, 0)
             end

something like that

I forgot to say that I use OTHire engine, probably I'll have to modify some things to make it work on it.

 

[Zothion]

local string = "sell 3 serpent swords"
print(string:match('%s(%d+)%s'))

the string:match will return the first number found in the string separated by space on both sides, then use normal script with the count

edit: i would not use a script that looks like what ryan posted, having a loop to go through every possible sellable item is a very bad way for performance, rather just set it so for example if you want players to say
"sell N item"
string:match() the 3rd and 4th word and check if its in the table (with or without an extra s at the end e.g serpent swordS)

 

[StreamSide]

nice you both guys