X-Git-Url: http://gitweb.michael.orlitzky.com/?p=dead%2Fhalcyon.git;a=blobdiff_plain;f=src%2FMain.hs;h=942b512f78716aaf2b62907fd19ec36e6a32809c;hp=a52a73fa51d37215255d2a2b17aec5e56737d1ea;hb=4f1ecbb17ed0e0a9506187630374468a46179514;hpb=fdc80f514bfe9005f55768f63b619ad170ad1b56

diff --git a/src/Main.hs b/src/Main.hs
index a52a73f..942b512 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -3,51 +3,61 @@ 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 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.
+-- | 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', 'Status', and default 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 :: Message -> String -> Status -> Message
-message_from_status message default_date status =
-  message { subject = "Twat: " ++ (screen_name (user status)),
-            body    = (pretty_print status),
+-- | 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
-    -- Use the Status' created_at date if it can be coerced into
-    -- RFC822 format.
-    date = case (created_at_to_rfc822 $ created_at status) of
-             Nothing -> default_date
-             Just c  -> c
+    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 Message -> [Status] -> IO ()
-send_messages cfg maybe_message statuses =
+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 message (default_date)
+      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
@@ -69,7 +79,7 @@ mention_replies cfg ss = do
 --   and verbose is enabled.
 mention_retweets :: Cfg -> [Status] -> IO ()
 mention_retweets cfg ss = do
-  let retweets = filter retweet ss
+  let retweets = filter retweeted ss
   when ((ignore_retweets cfg) && (verbose cfg)) $ do
     let countstr = show $ length retweets
     putStrLn  $ "Ignoring " ++ countstr ++ " retweets."
@@ -82,15 +92,15 @@ filter_statuses cfg ss =
   good_statuses
   where
   replies  = filter reply ss
-  retweets = filter retweet 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'
 
 
 
@@ -103,27 +113,31 @@ filter_statuses cfg ss =
 recurse :: Cfg -> String -> Integer -> (Maybe Message) -> IO ()
 recurse cfg username latest_status_id maybe_message = do
   thread_sleep (heartbeat cfg)
-  xmldata <- get_user_new_statuses username latest_status_id
+  timeline <- get_user_new_statuses cfg username latest_status_id
+
+  let decoded_timeline = decode timeline :: Maybe Timeline
 
-  -- 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  -> []
+  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
 
       let good_statuses = filter_statuses cfg new_statuses
 
-      _ <- mapM (putStrLn . pretty_print) good_statuses
+      tz <- getCurrentTimeZone
+      let mtz = Just tz
+      mapM_ (putStrLn . (pretty_print mtz)) good_statuses
 
-      send_messages cfg maybe_message 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
@@ -137,21 +151,28 @@ recurse cfg username latest_status_id maybe_message = do
 
 -- | 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 :: Int -> String -> IO Integer
-get_latest_status_id delay username = do
-  xmldata <- get_user_timeline username
+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_statuses = case xmldata of
-                           Just xml -> parse_statuses xml
-                           Nothing -> []
+  let initial_timeline = fromMaybe [] decoded_timeline
 
-  case (length initial_statuses) of
-    0 -> do
+  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 delay username
-    _ -> return (get_max_status_id initial_statuses)
+      get_latest_status_id cfg username
+    _  ->
+      return (get_max_status_id initial_timeline)
 
 
 
@@ -160,9 +181,9 @@ get_latest_status_id delay username = do
 --   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
-  latest_status_id <- get_latest_status_id (heartbeat cfg) username
+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 ()
 
@@ -183,77 +204,39 @@ construct_message cfg = do
                              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 <- help_set
-  when (help) $ 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
 
-  -- Get the list of usernames.
-  usernames <- parse_usernames
+  when (null $ get_usernames (usernames cfg)) $ do
+    hPutStrLn stderr "ERROR: no usernames supplied."
+    _ <- show_help
+    exitWith (ExitFailure exit_no_usernames)
 
-  -- And a Cfg object.
-  cfg <- get_cfg
-  
   -- 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.
     thread_sleep (heartbeat cfg)
 
   return ()
-
-
--- | A debugging tool that will parse, print, and email a single
---   status (given by its id).
-twat_single_status :: Cfg -> Integer -> (Maybe Message) -> IO ()
-twat_single_status cfg the_status_id maybe_message = do
-    xmldata <- get_status the_status_id
-
-    -- Parsing an empty result can blow up. Just pretend there are
-    -- no new statuses in that case.
-    let statuses = case xmldata of
-                     Just xml -> parse_status xml
-                     Nothing  -> []
-
-    case (length statuses) of
-      0 -> do
-        putStrLn "No statuses returned."
-        return ()
-      _ -> do
-        _ <- mapM (putStrLn . pretty_print) statuses
-
-        case maybe_message of
-          Nothing -> do
-             putStrLn "No message object given."
-             return ()
-          Just message -> do
-             default_date <- rfc822_now
-             let messages = map (message_from_status message (default_date)) statuses
-             sendmail_results <- mapM sendmail' messages
-             _ <- mapM print_sendmail_result sendmail_results
-             return ()
-    where
-      sendmail' = sendmail (sendmail_path cfg)
\ No newline at end of file