random-trigger.lua: trigger random scripts
expwnent
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026ef063a4
commit
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--scripts/modtools/random-trigger.lua
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--triggers random scripts
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--register a few scripts, then tell it to "go" and it will pick a random one based on the probability weights you specified. outcomes are mutually exclusive. To make independent random events, call the script multiple times.
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local utils = require 'utils'
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local eventful = require 'plugins.eventful'
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outcomeLists = outcomeLists or {}
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randomGen = randomGen or dfhack.random.new()
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eventful.enableEvent(eventful.eventType.UNLOAD, 1)
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eventful.onUnload.randomTrigger = function()
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outcomeLists = {}
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end
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validArgs = validArgs or utils.invert({
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'help',
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'command',
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'outcomeListName',
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'weight',
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'seed',
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'trigger',
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'preserveList',
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'withProbability',
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'listOutcomes',
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'clear',
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})
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local function triggerEvent(outcomeListName)
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local outcomeList = outcomeLists[outcomeListName]
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local r = randomGen:random(outcomeList.total)
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local sum = 0
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--print ('r = ' .. r)
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for i,outcome in ipairs(outcomeList.outcomes) do
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sum = sum + outcome.weight
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if sum > r then
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local temp = outcome.command
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--print('triggering outcome ' .. i .. ': "' .. table.concat(temp, ' ') .. '"')
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--dfhack.run_command(table.unpack(temp))
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dfhack.run_script(table.unpack(temp))
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break
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else
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--print ('sum = ' .. sum .. ' <= r = ' .. r)
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end
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end
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--print('Done.')
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--dfhack.print('\n')
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end
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local args = utils.processArgs({...}, validArgs)
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if args.help then
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print([[scripts/modtools/random-trigger.lua
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Allows mutually-exclusive random events. Register a list of scripts along with positive integer relative weights, then tell the script to select one of them with the specified probabilities and run it.
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The weights must be positive integers, but they do NOT have to sum to 100 or any other particular number.
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The outcomes are mutually exclusive: only one will be triggered.
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If you want multiple independent random events, call the script multiple times.
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99% of the time, you won't need to worry about this, but just in case, you can specify a name of a list of outcomes to prevent interference from other scripts that call this one.
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That also permits situations where you don't know until runtime what outcomes you want.
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For example, you could make a reaction-trigger that registers the worker as a mayor candidate, then run this script to choose a random mayor from the list of units that did the mayor reaction.
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arguments:
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-help
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print this help message
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-outcomeListName name
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specify the name of this list of outcomes to prevent interference if two scripts are registering outcomes at the same time
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if none is specified, the default outcome list is selected automatically
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-command [ commandStrs ]
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specify the command to be run if this outcome is selected
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must be specified unless the -trigger argument is given
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-weight n
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the relative probability weight of this outcome
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n must be a non-negative integer
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if not specified, n=1 is used by default
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-trigger
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selects a random script based on the specified outcomeList (or the default one if none is specified)
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-preserveList
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when combined with trigger, preserves the list of outcomes so you don't have to register them again
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it is extremely highly recommended that you always specify the outcome list name when you give this command to prevent almost certain interference
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if you want to trigger one of 5 outcomes three times, you might want this option even without -outcomeListName
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most of the time, you won't want this
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will NOT be preserved after the user saves/loads (ask expwnent if you want this: it's not that hard but if nobody wants it I won't bother)
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performance will be slightly faster if you preserve the outcome lists when possible and trigger them multiple times instead of reregistering each time, but the effect should be small
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-withProbability p
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p is a real number between 0 and 1 inclusive
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triggers the command immediately with this probability
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-seed s
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sets the random seed (guarantees the same sequence of random numbers will be produced internally)
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use for debugging purposes
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-listOutcomes
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lists the currently registered list of outcomes of the outcomeList along with their probability weights
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use for debugging purposes
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-clear
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unregister everything
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]])
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return
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end
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if args.clear then
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outcomeLists = {}
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end
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if args.weight and not tonumber(args.weight) then
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error ('Invalid weight: ' .. args.weight)
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end
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args.weight = (args.weight and tonumber(args.weight)) or 1
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if args.weight ~= math.floor(args.weight) then
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error 'Noninteger weight.'
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end
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if args.weight < 0 then
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error 'invalid weight: must be non-negative'
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end
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if args.seed then
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randomGen:init(tonumber(args.seed), 37) --37 is probably excessive and definitely arbitrary
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end
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args.outcomeListName = args.outcomeListName or ''
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args.outcomeListName = 'outcomeList ' .. args.outcomeListName
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if args.withProbability then
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args.withProbability = tonumber(args.withProbability)
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if not args.withProbability or args.withProbability < 0 or args.withProbability > 1 then
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error('Invalid withProbability: ' .. (args.withProbability or 'nil'))
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end
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if randomGen:drandom() < args.withProbability then
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dfhack.run_command(table.unpack(args.command))
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end
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end
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if args.trigger then
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triggerEvent(args.outcomeListName)
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if not args.preserveList then
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outcomeLists[args.outcomeListName] = nil
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end
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return
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end
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if args.listOutcomes then
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local outcomeList = outcomeLists[args.outcomeListName]
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if not outcomeList then
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print ('No outcomes registered.')
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return
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end
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print ('Total weight: ' .. outcomeList.total)
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for _,outcome in ipairs(outcomeList.outcomes) do
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print(' outcome weight ' .. outcome.weight .. ': ' .. table.concat(outcome.command, ' '))
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end
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print('\n')
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return
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end
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if not args.command then
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return
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end
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--actually register
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local outcomeList = outcomeLists[args.outcomeListName]
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if not outcomeList then
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outcomeLists[args.outcomeListName] = {}
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outcomeList = outcomeLists[args.outcomeListName]
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end
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outcomeList.total = args.weight + (outcomeList.total or 0)
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local outcome = {}
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outcome.weight = args.weight
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outcome.command = args.command
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outcomeList.outcomes = outcomeList.outcomes or {}
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table.insert(outcomeList.outcomes, outcome)
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