minetest_mana/init.lua

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--[[
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Mana 0.2.0
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This mod adds mana to players, a special attribute
License: WTFPL
]]
--[===[
Initialization
]===]
mana = {}
mana.playerlist = {}
--[===[
API functions
]===]
--[[ Sets the mana reserves of the specified player
It is ensured that the resulting value will always be within the bounds of [0, maxmana]
]]
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function mana.set(playername, value)
if value < 0 then
minetest.log("info", "[mana] Warning: mana.set was called with negative value!")
value = 0
end
if value > mana.playerlist[playername].maxmana then
value = mana.playerlist[playername].maxmana
end
if mana.playerlist[playername].mana ~= value then
mana.playerlist[playername].mana = value
mana.hud_update(playername)
end
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end
--[[ Sets the maximum mana of the specified player. The value must be positive or 0.
The player's mana reserves will be capped at the new maximum, if neccessary.
]]
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function mana.setmax(playername, value)
if value < 0 then
value = 0
minetest.log("info", "[mana] Warning: mana.setmax was called with negative value!")
end
if mana.playerlist[playername].maxmana ~= value then
mana.playerlist[playername].maxmana = value
if(mana.playerlist[playername].mana > value) then
mana.playerlist[playername].mana = value
end
mana.hud_update(playername)
end
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end
-- Returns the current mana of the specified player
function mana.get(playername)
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return mana.playerlist[playername].mana
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end
-- Returns the maximum mana of the specified player
function mana.getmax(playername)
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return mana.playerlist[playername].maxmana
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end
--[[
Adds up to the specified amount of mana to the player.
If the sum would be greater than the maximum, the new
mana amount will be capped at the maximum.
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returns:
- true, excess on success, where excess is the amount of mana which
was no
- false on failure
]]
function mana.add_up_to(playername, value)
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local t = mana.playerlist[playername]
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if(t ~= nil and value >= 0) then
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local excess
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if((t.mana + value) > t.maxmana) then
excess = (t.mana + value) - t.maxmana
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t.mana = t.maxmana
else
excess = 0
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t.mana = t.mana + value
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end
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mana.hud_update(playername)
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return true, excess
else
return false
end
end
--[[
Adds the specified amount of mana to the player,
iff it would not exceed the maximum.
returns:
- true on success, all mana has been added
- false on failure, no mana has been added
]]
function mana.add(playername, value)
local t = mana.playerlist[playername]
if(t ~= nil and ((t.mana + value) <= t.maxmana) and value >= 0) then
t.mana = t.mana + value
mana.hud_update(playername)
return true
else
return false
end
end
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--[[
Subtracts the specified amount of mana from the player,
iff the player has enough mana reserves.
returns:
- true on success, all mana has been subtracted
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- false on failure, no mana has been subtracted
]]
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function mana.subtract(playername, value)
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local t = mana.playerlist[playername]
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if(t ~= nil and t.mana >= value and value >= 0) then
t.mana = t.mana -value
mana.hud_update(playername)
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return true
else
return false
end
end
--[[
Subtracts up to the specified amount of mana from the player.
returns:
- true, missing on success, where missing is the amount of mana which could not been subtracted
- false on failure, no mana has been subtracted
]]
function mana.subtract_up_to(playername, value)
local t = mana.playerlist[playername]
if(t ~= nil and value >= 0) then
local missing
if((t.mana - value) < 0) then
missing = math.abs(t.mana - value)
t.mana = 0
else
missing = 0
t.mana = t.mana - value
end
mana.hud_update(playername)
return true, missing
else
return false
end
end
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--[===[
File handling, loading data, saving data, setting up stuff for players.
]===]
-- Load the playerlist from a previous session, if available.
do
local filepath = minetest.get_worldpath().."/mana.mt"
local file = io.open(filepath, "r")
if file then
minetest.log("action", "[mana] mana.mt opened.")
local string = file:read()
io.close(file)
if(string ~= nil) then
local savetable = minetest.deserialize(string)
mana.playerlist = savetable.playerlist
minetest.debug("[mana] mana.mt successfully read.")
end
end
end
function mana.save_to_file()
local savetable = {}
savetable.playerlist = mana.playerlist
local savestring = minetest.serialize(savetable)
local filepath = minetest.get_worldpath().."/mana.mt"
local file = io.open(filepath, "w")
if file then
file:write(savestring)
io.close(file)
minetest.log("action", "[mana] Wrote mana data into "..filepath..".")
else
minetest.log("error", "[mana] Failed to write mana data into "..filepath..".")
end
end
minetest.register_on_dieplayer(function(player)
local playername = player:get_player_name()
mana.set(playername, 0)
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mana.hud_update(playername)
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end)
minetest.register_on_leaveplayer(function(player)
local playername = player:get_player_name()
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mana.hud_remove(playername)
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mana.playerlist[playername] = nil
end)
minetest.register_on_shutdown(function()
minetest.log("action", "[mana] Server shuts down. Rescuing data into mana.mt")
mana.save_to_file()
end)
minetest.register_on_joinplayer(function(player)
local playername = player:get_player_name()
if mana.playerlist[playername] == nil then
mana.playerlist[playername] = {}
mana.playerlist[playername].mana = 0
mana.playerlist[playername].maxmana = 100
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end
if minetest.get_modpath("hudbars") ~= nil then
hud.init_hudbar(player, "mana", mana.get(playername), mana.getmax(playername))
else
mana.hud_add(playername)
end
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end)
--[===[
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HUD functions
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]===]
if minetest.get_modpath("hudbars") ~= nil then
hud.register_hudbar("mana", 0xFFFFFF, "Mana", { bar = "mana_bar.png", icon = "mana_icon.png" }, 0, 100, false)
function mana.hud_update(playername)
local player = minetest.get_player_by_name(playername)
hud.change_hudbar(player, "mana", mana.get(playername), mana.getmax(playername))
end
else
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function mana.manastring(playername)
return string.format("Mana: %d/%d", mana.get(playername), mana.getmax(playername))
end
function mana.hud_add(playername)
local player = minetest.get_player_by_name(playername)
id = player:hud_add({
hud_elem_type = "text",
position = { x = 0.5, y=0.9 },
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text = mana.manastring(playername),
scale = { x = 0, y = 0 },
alignment = { x = 1, y = 0},
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direction = 1,
number = 0xFFFFFF,
offset = { x = -200, y = 15}
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})
mana.playerlist[playername].hudid = id
return id
end
function mana.hud_update(playername)
local player = minetest.get_player_by_name(playername)
player:hud_change(mana.playerlist[playername].hudid, "number", mana.get(playername))
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end
function mana.hud_remove(playername)
local player = minetest.get_player_by_name(playername)
player:hud_remove(mana.playerlist[playername].hudid)
end
end