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
-import Configuration (Cfg(..))
-import ExitCodes
-import Mail
+import Configuration (Cfg(..), default_config, merge_optional)
+import ExitCodes (exit_no_usernames)
+import qualified OptionalConfiguration as OC
+import Mail (
+ Message(..),
+ default_headers,
+ print_sendmail_result,
+ rfc822_now,
+ sendmail
+ )
import Twitter.Http
import Twitter.Status
import Twitter.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
replies = filter reply ss
retweets = filter retweeted ss
- good_statuses' = case (ignore_replies cfg) of
- True -> ss \\ replies
- False -> ss
+ good_statuses' = if (ignore_replies cfg)
+ then ss \\ replies
+ else ss
- good_statuses = case (ignore_retweets cfg) of
- True -> good_statuses' \\ retweets
- False -> good_statuses'
+ good_statuses = if (ignore_retweets cfg)
+ then good_statuses' \\ retweets
+ else good_statuses'
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
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
- errors <- parse_errors
-
- -- If there were errors parsing the command-line options,
- -- print them and exit.
- when (not (null errors)) $ do
- hPutStrLn stderr (concat errors)
- putStrLn help_text
- exitWith (ExitFailure exit_args_parse_failed)
+ -- And a Cfg object.
+ rc_cfg <- OC.from_rc
+ cmd_cfg <- apply_args
- -- Next, check to see if the 'help' option was passed to the
- -- program. If it was, display the help, and exit successfully.
- help <- help_set
- when (help) $ do
- putStrLn help_text
- exitWith ExitSuccess
+ -- Merge the config file options with the command-line ones,
+ -- prefering the command-line ones.
+ let opt_config = rc_cfg <> cmd_cfg
- -- Get the list of usernames.
- usernames <- parse_usernames
+ -- Finally, update a default config with any options that have been
+ -- set in either the config file or on the command-line.
+ let cfg = merge_optional default_config opt_config
- -- And a Cfg object.
- cfg <- get_cfg
+ when (null $ get_usernames (usernames cfg)) $ do
+ hPutStrLn stderr "ERROR: no usernames supplied."
+ _ <- show_help
+ exitWith (ExitFailure exit_no_usernames)
-- If we have both a "To" and "From" address, we'll create a
-- 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
+ -- Execute run on each username in a new thread.
+ let run_curried = run cfg message
+ _ <- mapM (forkIO . run_curried) (get_usernames (usernames cfg))
- _ <- forever $ do
+ _ <- forever $
-- This thread (the one executing main) doesn't do anything,
-- but when it terminates, so do all the threads we forked.
-- As a result, we need to keep this thread on life support.
projects / dead / halcyon.git / blobdiff