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|
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE OverloadedStrings #-}
module Reaktor.Plugins.System (plugin) where
import Blessings
import Control.Applicative
import Control.Concurrent (forkIO)
import Control.Exception (finally)
import Data.Aeson
import qualified Data.ByteString.Char8 as BS
import qualified Data.Map as M
import Reaktor.Message
import Reaktor.Plugins.System.Types
import Reaktor.Types
import System.Environment (getEnvironment)
import System.FilePath.Posix (takeBaseName)
import System.IO (Handle,hClose,hPutStr,hIsEOF)
import System.IO (BufferMode(LineBuffering),hSetBuffering)
import System.Process (StdStream(CreatePipe),waitForProcess)
import System.Process (createProcess,CreateProcess(..),proc)
import qualified Text.Regex.PCRE.Heavy as RE
import qualified Text.Regex.PCRE.Light as RE
plugin :: Value -> IO Plugin
plugin = simplePlugin run
-- TODO indicated whether other plugins should run
run :: SystemConfig -> PluginFunc
run cfg (Message (Just prefix) "PRIVMSG" (msgtarget:text:[])) = do
nick_ <- getNick
let hs = maybe [] id (M.lookup "PRIVMSG" (hooks cfg))
mapM_ (\h -> run1 cfg nick_ h prefix msgtarget text) hs
run cfg (Message (Just prefix) "JOIN" (channel:[])) = do
nick_ <- getNick
let hs = maybe [] id (M.lookup "JOIN" (hooks cfg))
mapM_ (\h -> run1 cfg nick_ h prefix channel "") hs
-- TODO warning?
run _ _ = return ()
run1 ::
SystemConfig
-> Nickname
-> SystemParams
-> BS.ByteString
-> BS.ByteString
-> BS.ByteString
-> PluginIO ()
run1 cfg nick_ params prefix msgtarget text = do
let
isActivated =
case activate params of
Always -> Just ""
Match ->
case pattern params of
Nothing -> Nothing
Just pat ->
let
result = RE.scan patternRE text
patternRE = RE.compile pat []
in
if null result
then Nothing
else Just ""
Query ->
if
| BS.isPrefixOf (nick_ <> ":") text ->
Just (nick_ <> ":")
| BS.isPrefixOf "*:" text ->
Just "*:"
| isQuery ->
Just ""
| otherwise ->
Nothing
audience = if isQuery then from else msgtarget
-- TODO check if msgtarget is one of our channels?
-- what if our nick has changed?
isQuery = msgtarget == nick_
from = BS.takeWhile (/='!') prefix
--maybe prefix (flip BS.take prefix) $ BS.findIndex (=='!') prefix
case isActivated of
Just trigger -> do
let cmdline = BS.dropWhile (==' ') $ BS.drop (BS.length trigger) text
resultPrefix = if isQuery then [] else [from <> ":"]
parseCommandLine' pat s =
if null result then [] else snd (head result)
where
result = RE.scan patternRE s
patternRE = RE.compile pat []
parse' =
case pattern params of
Nothing -> [] -- TODO everything
Just pat -> parseCommandLine' pat cmdline
headMaybe x = if null x then Nothing else Just (head x)
-- TODO rename "command" to something like "commandSpec"
command' = case command params of
Capture i ->
case headMaybe (drop (fromIntegral i - 1) parse') of
Nothing -> Nothing
Just k -> M.lookup k (commands params)
CaptureOr c -> Just c
cmdName = case command params of
Capture i ->
case headMaybe (drop (fromIntegral i - 1) parse') of
Nothing -> "<CMDERP>"
Just k -> k
CaptureOr c -> BS.pack (takeBaseName $ commandPath c)
args' =
map BS.unpack $
map (maybe "" id) $
reverse $
dropWhile (==Nothing) $
reverse $
map f (arguments params)
where
f arg = case arg of
Capture i ->
case headMaybe (drop (fromIntegral i - 1) parse') of
Nothing -> Nothing
Just k -> Just k
CaptureOr x -> Just x
case command' of
Just c -> do
sendMsg_ <- gets s_sendMsg
putLog_ <- gets s_putLog
let onErrLine s =
putLog_ $ SGR [31,1] $
Plain (BS.pack (takeBaseName $ commandPath c) <> ": "<> s)
onOutLine s =
sendMsg_ (privmsg audience [s])
extraEnv = [("_prefix", BS.unpack prefix),
("_from", BS.unpack from)]
lift $ fork cfg c args' (Just extraEnv) "" onOutLine onErrLine
Nothing -> do
sendMsg (privmsg audience (resultPrefix <> [cmdName <> ": command not found"]))
Nothing -> return ()
fork :: SystemConfig
-> SystemCommand
-> [String]
-> Maybe [(String, String)]
-> String
-> (BS.ByteString -> IO ())
-> (BS.ByteString -> IO ())
-> IO ()
fork cfg cmd args extraEnv input onOutLine onErrLine = do
baseEnv <- getEnvironment
let procEnv = M.toList $ mconcat [
maybe mempty M.fromList extraEnv,
maybe mempty id (commandEnv cmd),
M.fromList baseEnv
]
(inh, outh, errh) <- do
(Just inh, Just outh, Just errh, ph) <-
createProcess (proc (commandPath cmd) args) {
cwd = commandWorkDir cmd <|> defaultWorkDir cfg,
env = Just procEnv,
std_in = CreatePipe,
std_out = CreatePipe,
std_err = CreatePipe,
close_fds = True,
create_group = True,
new_session = True
}
_ <- forkIO $ waitForProcess ph >> return ()
return (inh, outh, errh)
mapM_ forkIO [
hPutStr inh input `finally` hClose inh,
hWithLines outh onOutLine,
hWithLines errh onErrLine
]
hWithLines :: Handle -> (BS.ByteString -> IO ()) -> IO ()
hWithLines h f = do
hSetBuffering h LineBuffering
go `finally` hClose h
where
go =
hIsEOF h >>= \case
True -> return ()
False -> BS.hGetLine h >>= f >> go
|
