your-land-mirror/yl_speak_up
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yl_speak_up/fs/fs_add_trade_simple.lua

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-- when closing the yl_speak_up.get_fs_add_trade_simple formspec:
-- give the items back to the player (he took them from his inventory and
-- had no real chance to put them elsewhere - so there really ought to be
-- room enough)
yl_speak_up.add_trade_simple_return_items = function(player, trade_inv, pay, buy)
local player_inv = player:get_inventory()
if( pay and player_inv:room_for_item("main", pay)) then
player_inv:add_item("main", pay)
trade_inv:set_stack("setup", 1, "")
end
if( buy and player_inv:room_for_item("main", buy)) then
player_inv:add_item("main", buy)
trade_inv:set_stack("setup", 2, "")
end
end
-- simple trade: add a new trade or edit existing one (by storing a new one);
-- set trade_id to "new" if it shall be a new trade added to the trade list;
-- set trade_id to "<d_id> <o_id>" if it shall be a result/effect of a dialog option;
yl_speak_up.get_fs_add_trade_simple = function(player, trade_id)
if(not(player)) then
return yl_speak_up.trade_fail_fs
end
local pname = player:get_player_name()
local n_id = yl_speak_up.speak_to[pname].n_id
local dialog = yl_speak_up.speak_to[pname].dialog
-- is this player allowed to edit the NPC and his trades? If not abort.
if(not(yl_speak_up.may_edit_npc(player, n_id)) or not(dialog) or not(dialog.n_npc)) then
return "size[9,2]"..
"label[2.0,1.8;Ups! Something went wrong.]"..
"button[6.2,1.6;2.0,0.9;abort_trade_simple;Back]"
end
-- store the trade_id (so that it doesn't have to be transfered in a hidden field)
yl_speak_up.speak_to[pname].trade_id = trade_id
local delete_button =
"button[0.2,2.6;1.0,0.9;delete_trade_simple;Delete]"..
"tooltip[delete_trade_simple;Delete this trade.]"
-- no point in deleting a new trade - it doesn't exist yet
if(trade_id and trade_id == "new") then
delete_button = ""
end
return table.concat({"size[8.5,9]",
"label[4.35,0.8;",
minetest.formspec_escape(dialog.n_npc),
" sells:]",
"list[current_player;main;0.2,4.85;8,1;]",
"list[current_player;main;0.2,6.08;8,3;8]",
-- show the second slot of the setup inventory in the detached player's inv
"list[detached:yl_speak_up_player_",
pname,
";setup;2,1.5;1,1;]",
-- show the second slot of said inventory
"list[detached:yl_speak_up_player_",
pname,
";setup;5,1.5;1,1;1]",
"label[0.5,0.0;Configure trade with ",
minetest.formspec_escape(dialog.n_npc),
":]",
"label[1.5,0.8;The customer pays:]",
"label[1.5,3.8;Put items in the two slots and click on \"Store trade\".]",
"label[1.5,4.2;You will get your items back when storing the trade.]",
-- annoyingly, the height value no longer works :-(
"label[0.2,2.5;Item\nname:]",
"field[1.5,3.2;3,0.2;item_name_price;;]",
"label[4.35,2.5;If you don't have the item you\n",
"want to buy, then enter its item\n",
"name (i.e. default:diamond) here.]",
"button[0.2,1.6;1.0,0.9;abort_trade_simple;Abort]",
delete_button,
"button[6.2,1.6;2.0,0.9;store_trade_simple;Store trade]",
"tooltip[store_trade_simple;Click here to store this as a new trade. Your\n",
"items will be returned to you and the trade will\n",
"will be shown the way the customer can see it.]",
"tooltip[abort_trade_simple;Abort setting up this new trade.]"
}, "")
end
-- the player wants to add a simple trade; handle formspec input
-- possible inputs:
-- fields.back_from_error_msg show this formspec here again
-- fields.store_trade_simple store this trade as a result and
-- go on to showing the do_trade_simple formspec
-- fields.delete_trade_simple delete this trade
-- go back to edit options dialog
-- abort_trade_simple, ESC go back to edit options dialog
-- The rest is inventory item movement.
yl_speak_up.input_add_trade_simple = function(player, formname, fields, input_to)
if(not(player)) then
return 0
end
local pname = player:get_player_name()
if(not(input_to)) then
input_to = "add_trade_simple"
end
-- we return from showing an error message (the player may not have noticed
-- a chat message while viewing a formspec; thus, we showed a formspec message)
if(fields.back_from_error_msg) then
yl_speak_up.show_fs(player, input_to)
return
end
-- which trade are we talking about?
local trade_id = yl_speak_up.speak_to[pname].trade_id
-- this also contains the inventory list "setup" where the player placed the items
local trade_inv = minetest.get_inventory({type="detached", name="yl_speak_up_player_"..pname})
-- fields.abort_trade_simple can be ignored as it is similar to ESC
local pay = trade_inv:get_stack("setup", 1)
local buy = trade_inv:get_stack("setup", 2)
-- clicking on abort here when adding a new trade via the trade list
-- goes back to the trade list (does not require special privs)
if(fields.abort_trade_simple and trade_id == "new") then
-- we are no longer doing a particular trade
yl_speak_up.speak_to[pname].trade_id = nil
-- return the items (setting up the trade was aborted)
yl_speak_up.add_trade_simple_return_items(player, trade_inv, pay, buy)
-- ..else go back to the edit options formspec
yl_speak_up.show_fs(player, "trade_list")
return
end
-- adding a new trade via the trade list?
if(not(trade_id) and fields.store_trade_simple) then
trade_id = "new"
end
local n_id = yl_speak_up.speak_to[pname].n_id
local d_id = yl_speak_up.speak_to[pname].d_id
local o_id = yl_speak_up.speak_to[pname].o_id
-- the trade can only be changed in edit mode
if((input_to == "add_trade_simple")
-- exception: when adding a new trade via the trade list
-- (that is allowed without having to be in edit mode)
and not(trade_id == "new" and yl_speak_up.may_edit_npc(player, n_id))) then
-- return the items (setting up the trade was aborted)
yl_speak_up.add_trade_simple_return_items(player, trade_inv, pay, buy)
return
end
-- store the new trade
if(fields.store_trade_simple) then
local error_msg = ""
local simulated_pay = false
if(pay:is_empty() and fields.item_name_price and fields.item_name_price ~= "") then
pay = ItemStack(fields.item_name_price)
simulated_pay = true
end
-- check for error conditions
if(pay:is_empty()) then
error_msg = "What shall the customer pay?\nWe don't give away stuff for free here!"
elseif(buy:is_empty()) then
error_msg = "What shall your NPC sell?\nCustomers won't pay for nothing!"
elseif(pay:get_wear() > 0 or buy:get_wear() > 0) then
error_msg = "Selling used items is not possible."
elseif(not(minetest.registered_items[ pay:get_name() ])
or not(minetest.registered_items[ buy:get_name() ])) then
error_msg = "Unkown items cannot be traded."
elseif(pay:get_name() == buy:get_name()) then
error_msg = "Selling *and* buying the same item\nat the same time makes no sense."
else
-- get the necessary dialog data
local dialog = yl_speak_up.speak_to[pname].dialog
-- player_gives (pay stack):
local ps = pay:get_name().." "..tostring(pay:get_count())
-- npc_gives (buy stack):
local bs = buy:get_name().." "..tostring(buy:get_count())
local r_id = "?"
if(not(dialog.trades)) then
dialog.trades = {}
end
-- is this a trade attached to the trade list?
-- or do we have to create a new trade ID?
if(trade_id == "new") then
-- if the player adds the same trade again, the ID is reused; other
-- than that, the ID is uniq
-- (the ID is formed so that we can later easily sort the offers by
-- the name of the buy stack - which is more helpful for the player
-- than sorting by the pay stack)
trade_id = "sell "..bs.." for "..ps
-- log the change
yl_speak_up.log_change(pname, n_id,
"Trade: Added offer "..tostring(trade_id)..".")
-- add this new trade
dialog.trades[ trade_id ] = {pay={ps},buy={bs}}
-- actually save the dialog to disk
yl_speak_up.save_dialog(n_id, dialog)
-- store the newly created trade_id
yl_speak_up.speak_to[pname].trade_id = trade_id
-- all ok so far
error_msg = nil
-- storing trades that are associated with particular dialogs and options
-- requires d_id and o_id to be set
elseif(trade_id ~= "new" and (not(d_id) or not(o_id))) then
error_msg = "Internal error. o_id was not set."
else
-- would be too complicated to handle exceptions; this is for edit_mode:
if(yl_speak_up.npc_was_changed
and yl_speak_up.npc_was_changed[n_id]) then
-- record this as a change, but do not save do disk yet
table.insert(yl_speak_up.npc_was_changed[ n_id ],
"Dialog "..d_id..": Trade "..tostring(trade_id)..
" added to option "..tostring(o_id)..".")
end
-- add this new trade - complete with information to which dialog and
-- to which option the trade belongs
dialog.trades[ trade_id ] = {pay={ps},buy={bs}, d_id = d_id, o_id = o_id}
-- all ok so far
error_msg = nil
end
-- do not return yet - the items still need to be given back!
end
-- make sure we don't create items here out of thin air
if(simulated_pay) then
pay = ItemStack("")
end
-- show error message (that leads back to this formspec)
if(error_msg) then
yl_speak_up.show_fs(player, "msg", {
input_to = "yl_speak_up:"..input_to,
formspec =
"size[6,2]"..
"label[0.2,0.5;"..error_msg.."]"..
"button[2,1.5;1,0.9;back_from_error_msg;Back]"})
return
end
-- we need a way of deleting trades as well;
-- this affects only trades that are associated with dialogs and options;
-- trades from the trade list are deleted more directly
elseif(fields.delete_trade_simple) then
-- delete this result (if it exists)
-- get the necessary dialog data
local dialog = yl_speak_up.speak_to[pname].dialog
-- would be too complicated to handle exceptions; this is for edit_mode:
if(yl_speak_up.npc_was_changed
and yl_speak_up.npc_was_changed[n_id]) then
-- record this as a change
table.insert(yl_speak_up.npc_was_changed[ n_id ],
"Dialog "..d_id..": Trade "..tostring(trade_id)..
" deleted from option "..tostring(o_id)..".")
end
if(not(dialog.trades)) then
dialog.trades = {}
end
-- delete the trade type result
if(trade_id) then
dialog.trades[ trade_id ] = nil
end
-- do not return yet - the items still need to be given back!
end
-- return the items after successful setup
yl_speak_up.add_trade_simple_return_items(player, trade_inv, pay, buy)
local dialog = yl_speak_up.speak_to[pname].dialog
if(not(dialog.trades)) then
dialog.trades = {}
end
if(dialog.trades[ trade_id ] and dialog.trades[ trade_id ].d_id
and input_to == "add_trade_simple") then
yl_speak_up.speak_to[pname].trade_id = trade_id
-- tell the player that the new trade has been added
yl_speak_up.show_fs(player, "msg", {
input_to = "yl_speak_up:do_trade_simple",
formspec =
"size[6,2]"..
"label[0.2,0.5;The new trade has been configured successfully.]"..
"button[1.5,1.5;2,0.9;trade_simple_stored;Show trade]"})
-- return back to trade list
elseif(not(o_id)) then
-- we are no longer trading
yl_speak_up.speak_to[pname].trade_id = nil
-- ..else go back to the edit options formspec
yl_speak_up.show_fs(player, "trade_list")
else
-- we are no longer trading
yl_speak_up.speak_to[pname].trade_id = nil
-- the trade has been stored or deleted successfully
return true
-- -- ..else go back to the edit options formspec (obsolete)
-- yl_speak_up.show_fs(player, "edit_option_dialog",
-- {n_id = n_id, d_id = d_id, o_id = o_id})
end
end
yl_speak_up.get_fs_add_trade_simple_wrapper = function(player, param)
local pname = player:get_player_name()
-- the optional parameter param is the trade_id
if(not(param) and yl_speak_up.speak_to[pname]) then
param = yl_speak_up.speak_to[pname].trade_id
end
return yl_speak_up.get_fs_add_trade_simple(player, param)
end
yl_speak_up.register_fs("add_trade_simple",
yl_speak_up.input_add_trade_simple,
yl_speak_up.get_fs_add_trade_simple_wrapper,
-- force formspec version 1:
1
)
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