Log details about sent mails in a file

3 files changed, 58 insertions, 14 deletions

diff --git a/src/Logger.hs b/src/Logger.hs
new file mode 100644
index 0000000..4be55be
--- /dev/null
+++ b/src/Logger.hs
@@ -0,0 +1,22 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Logger
+  ( info
+  ) where
+
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.Text.IO as T (appendFile)
+import Data.Time.LocalTime (getZonedTime)
+import Data.Time.Format (formatTime, defaultTimeLocale)
+
+info :: Text -> IO ()
+info message = do
+  time <- T.pack <$> formatTime defaultTimeLocale "[%d/%m/%Y, %H:%M]" <$> getZonedTime
+  T.appendFile "logs" $
+    T.concat
+      [ time
+      , " - "
+      , message
+      , "\n"
+      ]
diff --git a/src/Main.hs b/src/Main.hs
index d72bd95..0aa2910 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -6,6 +6,7 @@ module Main
 
 import System.IO (stderr)
 
+import Data.Text (Text)
 import qualified Data.Text as T
 import qualified Data.Text.IO as T
 
@@ -28,24 +29,32 @@ main = do
   eitherConfig <- getConfig configPath
   case (eitherBirthdates, eitherConfig) of
     (Left err, _) ->
-      T.hPutStr stderr $
-        T.concat
-          [ "Error while parsing file "
-          , T.pack birthdatePath
-          , ":\n"
-          , err
-          ]
+      birthdateError err
     (_, Left err) ->
-      T.hPutStr stderr $
-        T.concat
-          [ "Error while parsing config file "
-          , T.pack birthdatePath
-          , ":\n"
-          , err
-          ]
+      configError err
     (Right birthdates, Right config) ->
       sendNotificationForBirthdayToday birthdates config
 
+birthdateError :: Text -> IO ()
+birthdateError err =
+  T.hPutStr stderr $
+    T.concat
+      [ "Error while parsing file "
+      , T.pack birthdatePath
+      , ":\n"
+      , err
+      ]
+
+configError :: Text -> IO ()
+configError err =
+  T.hPutStr stderr $
+    T.concat
+      [ "Error while parsing config file "
+      , T.pack configPath
+      , ":\n"
+      , err
+      ]
+
 sendNotificationForBirthdayToday :: [Birthdate] -> Config -> IO ()
 sendNotificationForBirthdayToday birthdates config = do
   currentDate <- getCurrentDate
diff --git a/src/SendMail.hs b/src/SendMail.hs
index 23b1b80..0e1f91d 100644
--- a/src/SendMail.hs
+++ b/src/SendMail.hs
@@ -5,12 +5,25 @@ module SendMail
   ) where
 
 import Data.Text (Text)
+import qualified Data.Text as T
 import Data.Text.Lazy (fromStrict)
 
 import Network.Mail.Mime
 
+import Logger
+
 sendMail :: Text -> Text -> Text -> Text -> IO ()
 sendMail to from subject body = do
+  Logger.info $
+    T.concat
+      [ "Sending mail to "
+      , to
+      , " with subject “"
+      , subject
+      , "” and body “"
+      , body
+      , "”"
+      ]
   renderSendMail (simpleMail' (address to) (address from) subject (fromStrict body))
 
 address :: Text -> Address