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|
{-# LANGUAGE TemplateHaskell, MultiParamTypeClasses, TypeSynonymInstances, FlexibleInstances #-}
-- | Module: Vote
-- | Support for voting
-- |
-- | License: lGPL
-- |
-- | added by Kenneth Hoste (boegel), 22/11/2005
-- | inspiration: Where plugin (thanks shapr,dons)
module Plugin.Poll (theModule) where
import Plugin hiding (choice)
import qualified Data.ByteString.Char8 as P
import qualified Data.Map as M
$(plugin "Vote")
newPoll :: Poll
newPoll = (True,[])
appendPoll :: String -> Poll -> (Maybe Poll)
appendPoll choice (o,ls) = Just (o,(choice,0):ls)
voteOnPoll :: Poll -> String -> (Poll,String)
voteOnPoll (o,poll) choice =
if any (\(x,_) -> x == choice) poll
then ((o,map (\(c,n) ->
if c == choice then (c,n+1)
else (c,n)) poll)
,"voted on " ++ show choice)
else ((o,poll),show choice ++ " is not currently a candidate in this poll")
------------------------------------------------------------------------
type Count = Int
type Candidate = String
type PollName = P.ByteString
type Poll = (Bool, [(Candidate, Count)])
type VoteState = M.Map PollName Poll
type VoteWriter = VoteState -> LB ()
-- type Vote m a = ModuleT VoteState m a
------------------------------------------------------------------------
-- Define a serialiser
voteSerial :: Serial VoteState
voteSerial = Serial (Just . showPacked) (Just . readPacked)
------------------------------------------------------------------------
instance Module VoteModule VoteState where
moduleCmds _ = ["poll-list"
,"poll-show"
,"poll-add"
,"choice-add"
,"vote"
,"poll-result"
,"poll-close"
,"poll-remove"]
--
-- todo, should @vote foo automagically add foo as a possibility?
moduleHelp _ s = case s of
"poll-list" -> "poll-list Shows all current polls"
"poll-show" -> "poll-show <poll> Shows all choices for some poll"
"poll-add" -> "poll-add <name> Adds a new poll, with no candidates"
"choice-add" -> "choice-add <poll> <choice> Adds a new choice to the given poll"
"vote" -> "vote <poll> <choice> Vote for <choice> in <poll>"
"poll-result" -> "poll-result <poll> Show result for given poll"
"poll-close" -> "poll-close <poll> Closes a poll"
"poll-remove" -> "poll-remove <poll> Removes a poll"
moduleDefState _ = return M.empty
moduleSerialize _ = Just voteSerial
process_ _ "poll-list" _ = do
result <- withMS $ \factFM writer -> processCommand factFM writer "poll-list" []
return [result]
process_ _ _ [] = return ["Missing argument. Check @help <vote-cmd> for info."]
process_ _ cmd dat = do
result <- withMS $ \factFM writer -> processCommand factFM writer cmd (words dat)
return [result]
------------------------------------------------------------------------
processCommand :: VoteState -> VoteWriter -> String -> [String] -> LB String
processCommand fm writer cmd dat = case cmd of
-- show all current polls
"poll-list" -> return $ listPolls fm
-- show candidates
"poll-show" -> return $ case length dat of
1 -> showPoll fm (head dat)
_ -> "usage: @poll-show <poll>"
-- declare a new poll
"poll-add" -> case length dat of
1 -> addPoll fm writer (head dat)
_ -> return "usage: @poll-add <poll> with \"ThisTopic\" style names"
"choice-add" -> case length dat of
2 -> addChoice fm writer (head dat) (last dat)
_ -> return "usage: @choice-add <poll> <choice>"
"vote" -> case length dat of
2 -> vote fm writer (head dat) (last dat)
_ -> return "usage: @vote <poll> <choice>"
"poll-result" -> return $ case length dat of
1 -> showResult fm (head dat)
_ -> "usage: @poll-result <poll>"
"poll-close" -> case length dat of
1 -> closePoll fm writer (head dat)
_ -> return "usage: @poll-close <poll>"
"poll-remove" -> case length dat of
1 -> removePoll fm writer (head dat)
_ -> return "usage: @poll-remove <poll>"
_ -> return "Unknown command."
------------------------------------------------------------------------
listPolls :: VoteState -> String
listPolls fm = show $ map fst (M.toList fm)
showPoll :: VoteState -> String -> String
showPoll fm poll =
case M.lookup (P.pack poll) fm of
Nothing -> "No such poll: " ++ show poll ++ " Use @poll-list to see the available polls."
Just p -> show $ map fst (snd p)
addPoll :: VoteState -> VoteWriter -> String -> LB String
addPoll fm writer poll =
case M.lookup (P.pack poll) fm of
Nothing -> do writer $ M.insert (P.pack poll) newPoll fm
return $ "Added new poll: " ++ show poll
Just _ -> return $ "Poll " ++ show poll ++
" already exists, choose another name for your poll"
addChoice :: VoteState -> VoteWriter -> String -> String -> LB String
addChoice fm writer poll choice = case M.lookup (P.pack poll) fm of
Nothing -> return $ "No such poll: " ++ show poll
Just _ -> do writer $ M.update (appendPoll choice) (P.pack poll) fm
return $ "New candidate " ++ show choice ++
", added to poll " ++ show poll ++ "."
vote :: VoteState -> VoteWriter -> String -> String -> LB String
vote fm writer poll choice = case M.lookup (P.pack poll) fm of
Nothing -> return $ "No such poll:" ++ show poll
Just (False,_) -> return $ "The "++ show poll ++ " poll is closed, sorry !"
Just p@(True,_) -> do let (np,msg) = voteOnPoll p choice
writer $ M.update (const (Just np)) (P.pack poll) fm
return msg
showResult :: VoteState -> String -> String
showResult fm poll = case M.lookup (P.pack poll) fm of
Nothing -> "No such poll: " ++ show poll
Just (o,p) -> "Poll results for " ++ poll ++ " (" ++ (status o) ++ "): "
++ (concat $ intersperse ", " $ map ppr p)
where
status s | s = "Open"
| otherwise = "Closed"
ppr (x,y) = x ++ "=" ++ show y
removePoll :: VoteState -> VoteWriter -> String -> LB String
removePoll fm writer poll = case M.lookup (P.pack poll) fm of
Just (True,_) -> return "Poll should be closed before you can remove it."
Just (False,_) -> do writer $ M.delete (P.pack poll) fm
return $ "poll " ++ show poll ++ " removed."
Nothing -> return $ "No such poll: " ++ show poll
closePoll :: VoteState -> VoteWriter -> String -> LB String
closePoll fm writer poll = case M.lookup (P.pack poll) fm of
Nothing -> return $ "No such poll: " ++ show poll
Just (_,p) -> do writer $ M.update (const (Just (False,p))) (P.pack poll) fm
return $ "Poll " ++ show poll ++ " closed."
|
