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modloader.lua
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modloader.lua
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--[[
Copyright 2019 Zakru
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
]]
-- The modloader module keeps track of every mod and their content
local modloader = {}
modloader.mods = {}
modloader.tiles = {}
modloader.entities = {}
modloader.generators = {}
modloader.events = {}
modloader.keybinds = {}
modloader.keyevents = {}
local Tile = require('engine/tile')
local Mod = require('engine/mod')
local World = require('engine/world')
local Tilemap = require('engine/tilemap')
local Entity = require('engine/entity')
local Creature = require('engine/creature')
local Resource = require('engine/resource')
local function registerTileFactory(namespace)
return function(id, tile)
if not modloader.tiles[namespace] then modloader.tiles[namespace] = {} end
modloader.tiles[namespace][id] = tile
tile.registeredNamespace = namespace
tile.registeredId = id
end
end
local function registerEntityFactory(namespace)
return function(id, entity)
if not modloader.entities[namespace] then modloader.entities[namespace] = {} end
modloader.entities[namespace][id] = entity
entity.registeredNamespace = namespace
entity.registeredId = id
end
end
local function registerGeneratorFactory(namespace)
return function(id, generator)
if not modloader.generators[namespace] then modloader.generators[namespace] = {} end
modloader.generators[namespace][id] = generator
end
end
local function registerEventFactory(namespace)
return function(id)
if not modloader.events[namespace] then modloader.events[namespace] = {} end
local e = {}
e.listeners = {}
modloader.events[namespace][id] = e
function e.addListener(listener)
table.insert(e.listeners, listener)
end
function e.call(...)
for l,listener in ipairs(e.listeners) do
listener(...)
end
end
return e
end
end
local function registerKeybindFactory(namespace)
return function(id, defaultKey)
if not modloader.keyevents[namespace] then modloader.keyevents[namespace] = {} end
local e = {}
e.listeners = {}
e.keybind = {key=defaultKey, event=e}
modloader.keyevents[namespace][id] = e
function e.addListener(listener)
table.insert(e.listeners, listener)
end
table.insert(modloader.keybinds, e.keybind)
return e
end
end
local function safeCall(modId, func, ...)
if arg[2] == '--test' then
local status, err, ret xpcall(function()
func(unpack(args))
end, function(err)
print(err)
end)
if status then
return status, err, ret
end
love.event.quit(1)
end
local args = ... or {}
return xpcall(function()
func(unpack(args))
end, function(err)
modloader.mods[modId] = nil
print(err)
end)
end
local function getMod(name)
return modloader.mods[name]
end
local _require
local function loadGlobals(prefix)
_G.selfRequire = function(path)
return require(prefix .. path)
end
end
local function unloadGlobals()
_G.selfRequire = nil
end
function modloader.load()
_G.modRequire = function(mod, path)
return require('modules/' .. mod .. '/' .. path)
end
local modDirs = love.filesystem.getDirectoryItems('modules')
-- Load modules
for _,namespace in ipairs(modDirs) do
local status, _,_ = safeCall(namespace, function()
local modMain = love.filesystem.getInfo('modules/' .. namespace .. '/main.lua')
-- If the module has a main.lua, require its return value
if modMain and modMain.type == 'file' then
loadGlobals('modules/' .. namespace .. '/')
-- Require the mod
modloader.mods[namespace] = modRequire(namespace, 'main')
-- PRELOAD MOD
modloader.mods[namespace]:preLoad({
registerEvent=registerEventFactory(namespace),
registerKeybind=registerKeybindFactory(namespace),
registerTile=registerTileFactory(namespace),
registerEntity=registerEntityFactory(namespace),
registerGenerator=registerGeneratorFactory(namespace),
})
-- Unload globals
unloadGlobals()
end
end)
if not status then
print(namespace .. ': An error occurred and this mod was disabled.')
end
end
for _,namespace in ipairs(modloader.mods) do
modloader.mods[namespace]:load({
registerEventListener=registerEventListener,
})
end
-- LOAD RESOURCES
love.graphics.setDefaultFilter('linear', 'nearest')
-- Tiles
for namespace, tiles in pairs(modloader.tiles) do
for id, tile in pairs(tiles) do
tile.texture = love.graphics.newImage('modules/' .. namespace .. '/tile/' .. id .. '.png')
end
end
-- Entities
for namespace, entities in pairs(modloader.entities) do
for id, entity in pairs(entities) do
entity.texture = love.graphics.newImage('modules/' .. namespace .. '/entity/' .. id .. '.png')
end
end
-- Load miscellaneous resources
for namespace, mod in pairs(modloader.mods) do
local resources = {}
for _,filename in ipairs(love.filesystem.getDirectoryItems('modules/' .. namespace .. '/resource')) do
resources[filename] = Resource:new('modules/' .. namespace .. '/resource/' .. filename)
end
modloader.mods[namespace]:postLoad(resources)
end
end
function modloader.getInitialWorld()
for id,mod in pairs(modloader.mods) do
local initialWorld = mod:getInitialWorld()
if initialWorld then
return initialWorld
end
end
return nil
end
function modloader.update(dt, world)
for id,mod in pairs(modloader.mods) do
mod:preUpdate(dt, world)
end
if world then
world:update(dt)
end
for id,mod in pairs(modloader.mods) do
mod:update(dt, world)
end
end
function modloader.draw()
for id,mod in pairs(modloader.mods) do
mod:draw()
end
end
function modloader.handleKey(key, pressed)
for _,keybind in ipairs(modloader.keybinds) do
if keybind.key == key then
for l,listener in ipairs(keybind.event.listeners) do
listener(pressed)
end
end
end
end
return modloader