module Main
where
-import Control.Concurrent (forkIO, threadDelay)
-import Control.Monad (forever, when)
-import Data.Aeson (decode)
-import Data.List ((\\))
-import Data.Monoid ((<>))
-import Data.Time.LocalTime (TimeZone, getCurrentTimeZone)
-import System.Exit (ExitCode(..), exitWith)
-import System.IO (hPutStrLn, stderr)
-
-import CommandLine
-import Configuration (Cfg(..), default_config, merge_optional)
-import ExitCodes (exit_no_usernames)
-import qualified OptionalConfiguration as OC
+import Control.Concurrent ( forkIO, threadDelay )
+import Control.Monad ( forever, when )
+import Data.Aeson ( decode )
+import Data.List ( (\\) )
+import Data.Maybe ( fromMaybe, isNothing )
+import Data.Monoid ( (<>) )
+import Data.Time.LocalTime ( TimeZone, getCurrentTimeZone )
+import System.Exit ( ExitCode(..), exitWith )
+import System.IO ( hPutStrLn, stderr )
+
+import CommandLine ( get_args, show_help )
+import Configuration ( Cfg(..), default_config, merge_optional )
+import ExitCodes ( exit_no_usernames )
+import qualified OptionalConfiguration as OC ( from_rc )
import Mail (
Message(..),
default_headers,
print_sendmail_result,
rfc822_now,
- sendmail
- )
-import Twitter.Http
-import Twitter.Status
-import Twitter.User
-
+ sendmail )
+import Twitter.Http ( get_user_new_statuses, get_user_timeline )
+import Twitter.Status (
+ Status(..),
+ Timeline,
+ get_max_status_id,
+ pretty_print,
+ utc_time_to_rfc822 )
+import Twitter.User ( User(..) )
+import Usernames ( Usernames(..) )
-- | A wrapper around threadDelay which takes seconds instead of
-- microseconds as its argument.
-- /Date: / header, and returns the updated message.
message_from_status :: Maybe TimeZone -> Message -> String -> Status -> Message
message_from_status mtz message default_date status =
- message { subject = "Twat: " ++ (screen_name (user status)),
+ message { subject = "Halcyon: " ++ (screen_name (user status)),
body = (pretty_print mtz status),
headers = ((headers message) ++ ["Date: " ++ date])}
where
thread_sleep (heartbeat cfg)
timeline <- get_user_new_statuses cfg username latest_status_id
- -- FIXME
- let Just new_statuses = decode timeline :: Maybe Timeline
+ let decoded_timeline = decode timeline :: Maybe Timeline
+
+ when (isNothing decoded_timeline) $
+ hPutStrLn stderr $
+ "Couldn't retrieve "
+ ++ username
+ ++ "'s timeline. Skipping..."
- case (length new_statuses) of
- 0 ->
- do_recurse latest_status_id
- _ -> do
+ let new_statuses = fromMaybe [] decoded_timeline
+ case new_statuses of
+ [] -> do_recurse latest_status_id
+ _ -> do
mention_replies cfg new_statuses
mention_retweets cfg new_statuses
tz <- getCurrentTimeZone
let mtz = Just tz
- mapM_ (putStrLn . (pretty_print mtz)) good_statuses
+ mapM_ (putStr . (pretty_print mtz)) good_statuses
send_messages cfg mtz maybe_message good_statuses
get_latest_status_id cfg username = do
let delay = heartbeat cfg
timeline <- get_user_timeline cfg username
- let Just initial_timeline = decode timeline :: Maybe Timeline
- case (length initial_timeline) of
- 0 -> do
+ let decoded_timeline = decode timeline :: Maybe Timeline
+
+ when (isNothing decoded_timeline) $
+ hPutStrLn stderr $
+ "Couldn't retrieve "
+ ++ username
+ ++ "'s timeline. Skipping..."
+
+ let initial_timeline = fromMaybe [] decoded_timeline
+
+ case initial_timeline of
+ [] -> do
-- If the HTTP part barfs, try again after a while.
- putStrLn ("Couldn't retrieve " ++ username ++ "'s timeline. Retrying...")
thread_sleep delay
get_latest_status_id cfg username
- _ -> return (get_max_status_id initial_timeline)
+ _ ->
+ return (get_max_status_id initial_timeline)
-- recursive loop that checks for updates forever. The message
-- argument is optional and is passed to recurse in case the updates
-- should be emailed.
-run_twat :: Cfg -> Maybe Message -> String -> IO ()
-run_twat cfg msg username = do
+run :: Cfg -> Maybe Message -> String -> IO ()
+run cfg msg username = do
latest_status_id <- get_latest_status_id cfg username
recurse cfg username latest_status_id msg
return ()
from = f }
-- |The main function just parses the command-line arguments and then
--- forks off calls to 'run_twat' for each supplied username. After
+-- forks off calls to 'run' for each supplied username. After
-- forking, main loops forever.
main :: IO ()
main = do
-- And a Cfg object.
rc_cfg <- OC.from_rc
- cmd_cfg <- apply_args
+ cmd_cfg <- get_args
-- Merge the config file options with the command-line ones,
-- prefering the command-line ones.
-- set in either the config file or on the command-line.
let cfg = merge_optional default_config opt_config
- when (null $ usernames cfg) $ do
+ when (null $ get_usernames (usernames cfg)) $ do
hPutStrLn stderr "ERROR: no usernames supplied."
_ <- show_help
exitWith (ExitFailure exit_no_usernames)
-- message object to be passed to all of our threads.
let message = construct_message cfg
- -- Execute run_twat on each username in a new thread.
- let run_twat_curried = run_twat cfg message
- _ <- mapM (forkIO . run_twat_curried) (usernames cfg)
+ -- Execute run on each username in a new thread.
+ let run_curried = run cfg message
+ _ <- mapM (forkIO . run_curried) (get_usernames (usernames cfg))
_ <- forever $
-- This thread (the one executing main) doesn't do anything,
projects / dead / halcyon.git / blobdiff