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{-# LANGUAGE TemplateHaskell, MultiParamTypeClasses, TypeSynonymInstances, FlexibleInstances #-}
-- Plugin.Source
-- Display source for specified identifiers
module Plugin.Source (theModule) where
import Plugin
import Lambdabot.Util
import qualified Data.Map as M
import qualified Data.ByteString.Char8 as P
import Data.ByteString.Char8 (pack,ByteString)
$(plugin "Source")
type Env = M.Map ByteString ByteString
instance Module SourceModule Env where
moduleCmds _ = ["src"]
moduleHelp _ _ = help
-- all the hard work is done to build the src map.
-- uses a slighly custom Map format
moduleSerialize _= Just . readOnly $ M.fromList . map pair . splat . P.lines
where
pair (a:b) = (a, P.unlines b)
splat [] = []
splat s = a : splat (tail b) where (a,b) = break P.null s
fprocess_ _ _ key = readMS >>= \env -> case fetch key env of
_ | M.null env -> box $ pack "No source in the environment yet"
_ | P.null key -> box $ pack help
Nothing -> box . P.pack . ("Source not found. " ++) =<< io (random insult)
Just s -> box s
fetch :: ByteString -> M.Map ByteString ByteString -> Maybe ByteString
fetch x m = M.lookup x m `mplus`
M.lookup (P.concat [P.singleton '(', x, P.singleton ')']) m
help :: String
help = "src <id>. Display the implementation of a standard function"
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