X-Git-Url: http://gitweb.michael.orlitzky.com/?p=dead%2Fhalcyon.git;a=blobdiff_plain;f=src%2FMain.hs;h=942b512f78716aaf2b62907fd19ec36e6a32809c;hp=f42f2ce57738a4899005d146bf0700b46c88a377;hb=4f1ecbb17ed0e0a9506187630374468a46179514;hpb=69b8af30f49aaad0f5c051998d2556b9ec291df7

diff --git a/src/Main.hs b/src/Main.hs
index f42f2ce..942b512 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -3,152 +3,240 @@ where
 
 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
-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(..))
 
-
--- |The length of all calls to sleep (or threadDelay), in seconds.
-heartbeat :: Int
-heartbeat = 600
-
--- |A wrapper around threadDelay which takes seconds instead of
--- microseconds as its argument.
+-- | A wrapper around threadDelay which takes seconds instead of
+--   microseconds as its argument.
 thread_sleep :: Int -> IO ()
 thread_sleep seconds = do
   let microseconds = seconds * (10 ^ (6 :: Int))
   threadDelay microseconds
 
 
--- |Given a 'Message' and a 'Status', update that message's body and
--- subject with the information contained in the status. Returns the
--- updated message.
-message_from_status :: Message -> Status -> Message
-message_from_status message status =
-    message { subject = "Twat: " ++ (screen_name (user status)),
-              body    = (pretty_print status) }
-
-
--- |This is the main recursive loop. It takes a username, a
--- latest_status_id, and optionally a 'Message' as arguments. The
--- latest_status_id is the last status (that we know of) to be posted
--- to username's Twitter account. If we find any newer statuses when
--- we check, they are printed and optionally emailed (if a 'Message'
--- was supplied). Then, the process repeats.
-recurse :: String -> Integer -> (Maybe Message) -> IO ()
-recurse username latest_status_id maybe_message = do
-    thread_sleep heartbeat
-    xmldata <- get_user_new_statuses username latest_status_id
-
-    -- Parsing an empty result can blow up. Just pretend there are
-    -- no new statuses in that case.
-    let new_statuses = case xmldata of
-                         Just xml -> parse_statuses xml
-                         Nothing  -> []
-
-    case (length new_statuses) of
-      0 ->
-        recurse username latest_status_id maybe_message
-      _ -> do
-        let new_latest_status_id = get_max_status_id new_statuses
-        mapM (putStrLn . pretty_print) new_statuses
-
-        case maybe_message of
-          Nothing -> do
-             recurse username new_latest_status_id maybe_message
-             return ()
-          Just message -> do
-             let messages = map (message_from_status message) new_statuses
-             sendmail_results <- mapM sendmail messages
-             mapM print_sendmail_result sendmail_results
-             recurse username new_latest_status_id maybe_message
-             return ()
-
-
--- |Try continually to download username's timeline, and determine the
--- latest status id to be posted once we have done so.
-get_latest_status_id :: String -> IO Integer
-get_latest_status_id username = do
-  xmldata <- get_user_timeline username
-
-  let initial_statuses = case xmldata of
-                           Just xml -> parse_statuses xml
-                           Nothing -> []
-
-  case (length initial_statuses) of
-    0 -> do
+-- | Given a 'Message', 'Status', and date, update that message's body
+-- and subject with the information contained in the status. Adds a
+-- /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 = "Halcyon: " ++ (screen_name (user status)),
+            body    = (pretty_print mtz status),
+            headers = ((headers message) ++ ["Date: " ++ date])}
+  where
+    date =
+      case created_at status of
+        Nothing -> default_date
+        Just c  -> utc_time_to_rfc822 mtz c
+
+-- | If the given Message is not Nothing, send a copy of it for every
+-- Status in the list.
+send_messages :: Cfg -> Maybe TimeZone -> Maybe Message -> [Status] -> IO ()
+send_messages cfg mtz maybe_message statuses =
+  case maybe_message of
+    Nothing -> return ()
+    Just message -> do
+      default_date <- rfc822_now
+      let mfs = message_from_status mtz message default_date
+      let messages = map mfs statuses
+      sendmail_results <- mapM sendmail' messages
+      _ <- mapM print_sendmail_result sendmail_results
+      return ()
+  where
+    sendmail' = sendmail (sendmail_path cfg)
+
+-- | Display the number of skipped replies if ignore_replies is true
+--   and verbose is enabled.
+mention_replies :: Cfg -> [Status] -> IO ()
+mention_replies cfg ss = do
+  let replies  = filter reply ss
+  when ((ignore_replies cfg) && (verbose cfg)) $ do
+    let countstr = show $ length replies
+    putStrLn $ "Ignoring " ++ countstr ++ " replies."
+
+
+-- | Display the number of skipped retweets if ignore_retweets is true
+--   and verbose is enabled.
+mention_retweets :: Cfg -> [Status] -> IO ()
+mention_retweets cfg ss = do
+  let retweets = filter retweeted ss
+  when ((ignore_retweets cfg) && (verbose cfg)) $ do
+    let countstr = show $ length retweets
+    putStrLn  $ "Ignoring " ++ countstr ++ " retweets."
+
+
+
+-- | Filter out replies/retweets based on the configuration.
+filter_statuses :: Cfg -> [Status] -> [Status]
+filter_statuses cfg ss =
+  good_statuses
+  where
+  replies  = filter reply ss
+  retweets = filter retweeted ss
+
+  good_statuses' = if (ignore_replies cfg)
+                   then ss \\ replies
+                   else ss
+
+  good_statuses = if (ignore_retweets cfg)
+                  then good_statuses' \\ retweets
+                  else good_statuses'
+
+
+
+-- | This is the main recursive loop. It takes a the configuration, a
+--   username, a latest_status_id, and optionally a 'Message' as
+--   arguments. The latest_status_id is the last status (that we know
+--   of) to be posted to username's Twitter account. If we find any
+--   newer statuses when we check, they are printed and optionally
+--   emailed (if a 'Message' was supplied). Then, the process repeats.
+recurse :: Cfg -> String -> Integer -> (Maybe Message) -> IO ()
+recurse cfg username latest_status_id maybe_message = do
+  thread_sleep (heartbeat cfg)
+  timeline <- get_user_new_statuses cfg username latest_status_id
+
+  let decoded_timeline = decode timeline :: Maybe Timeline
+
+  when (isNothing decoded_timeline) $
+    hPutStrLn stderr $
+      "Couldn't retrieve "
+      ++ username
+      ++ "'s timeline. Skipping..."
+
+  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
+
+      let good_statuses = filter_statuses cfg new_statuses
+
+      tz <- getCurrentTimeZone
+      let mtz = Just tz
+      mapM_ (putStrLn . (pretty_print mtz)) good_statuses
+
+      send_messages cfg mtz maybe_message good_statuses
+
+      let new_latest_status_id = get_max_status_id new_statuses
+      do_recurse new_latest_status_id
+
+  where
+    -- This lets us write all of these parameters once rather
+    -- than... more than once.
+    do_recurse :: Integer -> IO ()
+    do_recurse lsi = recurse cfg username lsi maybe_message
+
+
+-- | Try continually to download username's timeline, and determine the
+--   latest status id to be posted once we have done so.
+get_latest_status_id :: Cfg -> String -> IO Integer
+get_latest_status_id cfg username = do
+  let delay = heartbeat cfg
+  timeline <- get_user_timeline cfg username
+
+  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 heartbeat
-      get_latest_status_id username
-    _ -> return (get_max_status_id initial_statuses)
-
-
-
--- |This function wraps two steps. First, we need to find the latest
--- status id posted by username. Once we have that, we can begin the
--- 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 :: Maybe Message -> String -> IO ()
-run_twat message username = do
-  latest_status_id <- get_latest_status_id username
-  recurse username latest_status_id message
+      thread_sleep delay
+      get_latest_status_id cfg username
+    _  ->
+      return (get_max_status_id initial_timeline)
+
+
+
+-- | This function wraps two steps. First, we need to find the latest
+--   status id posted by username. Once we have that, we can begin the
+--   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 :: 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 ()
 
 
+
+-- | Take advantage of the Maybe monad to only return a message when
+--   we have both a "to" and "from" address.
+construct_message :: Cfg -> Maybe Message
+construct_message cfg = do
+  to_addr <- to_address cfg
+  from_addr <- from_address cfg
+  return $ make_msg to_addr from_addr
+  where
+    make_msg t f = Message { headers = default_headers,
+                             body = "",
+                             subject = "",
+                             to = t,
+                             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
+  -- And a Cfg object.
+  rc_cfg  <- OC.from_rc
+  cmd_cfg <- apply_args
 
-  -- 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)
+  -- Merge the config file options with the command-line ones,
+  -- prefering the command-line ones.
+  let opt_config = rc_cfg <> cmd_cfg
 
-  -- Next, check to see if the 'help' option was passed to the
-  -- program. If it was, display the help, and exit successfully.
-  help_opt_set <- help_set
-  when help_opt_set $ do
-      putStrLn help_text
-      exitWith ExitSuccess
+  -- 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
 
-  usernames <- parse_usernames
+  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.
-  to_address <- to_email_address
-  from_address <- from_email_address
-  let message = case to_address of
-                  Nothing -> Nothing
-                  Just toaddr ->
-                      case from_address of
-                        Nothing -> Nothing
-                        Just fromaddr ->
-                            Just (Message { headers = [],
-                                            body = "",
-                                            subject = "",
-                                            to = toaddr,
-                                            from = fromaddr })
-
-  -- Execute run_twat on each username in a new thread.
-  mapM (forkIO . (run_twat message)) usernames
-
-  forever $ do
+  let message = construct_message 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,
     -- but when it terminates, so do all the threads we forked.
     -- As a result, we need to keep this thread on life support.
-    thread_sleep heartbeat
+    thread_sleep (heartbeat cfg)
 
   return ()