X-Git-Url: http://gitweb.michael.orlitzky.com/?p=dead%2Fhalcyon.git;a=blobdiff_plain;f=src%2FMain.hs;h=942b512f78716aaf2b62907fd19ec36e6a32809c;hp=14539c11a737defc430d35e8aed0491c9d3cb397;hb=4f1ecbb17ed0e0a9506187630374468a46179514;hpb=dd6cea3dc5e830691b1da442fcf91602e4cf94aa

diff --git a/src/Main.hs b/src/Main.hs
index 14539c1..942b512 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -2,21 +2,30 @@ module Main
 where
 
 import Control.Concurrent (forkIO, threadDelay)
-import Control.Monad (forever, unless, when)
+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(..), exitSuccess, exitWith)
+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.
@@ -31,7 +40,7 @@ thread_sleep seconds = do
 -- /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
@@ -106,14 +115,19 @@ recurse cfg username latest_status_id maybe_message = do
   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
 
@@ -141,15 +155,24 @@ 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 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)
 
 
 
@@ -158,8 +181,8 @@ get_latest_status_id cfg 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
+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 ()
@@ -181,39 +204,34 @@ 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
-
-  -- If there  were errors parsing the command-line options,
-  -- print them and exit.
-  unless (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
-    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 $
     -- This thread (the one executing main) doesn't do anything,