From 6850159bf998a209ad7b6d7103d113a54659937e Mon Sep 17 00:00:00 2001
From: Joris
Date: Sat, 21 Nov 2015 17:32:28 +0100
Subject: Add filter birthday between function

---
 README.md        |  2 +-
 src/Birthdate.hs | 17 +++++++++++++----
 src/Date.hs      | 18 ++++++++++++++++++
 src/Main.hs      | 30 +++++++++++++++++-------------
 4 files changed, 49 insertions(+), 18 deletions(-)

diff --git a/README.md b/README.md
index ec643c7..5fa517b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ birthdates.csv:
 …
 ```
 
-Mail contacts are given in config.txt:
+Create config.txt:
 
 ```
 mail-to = john.dupont@mail.com
diff --git a/src/Birthdate.hs b/src/Birthdate.hs
index c9d0bda..48d3a4e 100644
--- a/src/Birthdate.hs
+++ b/src/Birthdate.hs
@@ -4,13 +4,13 @@ module Birthdate
   ( Birthdate(..)
   , fullname
   , age
-  , filterBirthday
+  , filterBirthdayAt
   ) where
 
 import Data.Text (Text)
 import qualified Data.Text as T
 
-import Date (Date, sameDayAndMonth, yearsGap)
+import Date
 
 data Birthdate = Birthdate
   { date :: Date
@@ -24,5 +24,14 @@ fullname d = T.concat [firstname d, " ", lastname d]
 age :: Date -> Birthdate -> Int
 age currentDate birthdate = yearsGap currentDate (date birthdate)
 
-filterBirthday :: Date -> [Birthdate] -> [Birthdate]
-filterBirthday d = filter (sameDayAndMonth d . date)
+filterBirthdayAt :: Date -> [Birthdate] -> [Birthdate]
+filterBirthdayAt d = filter (sameDayAndMonth d . date)
+
+filterBirthdayBetween :: Date -> Date -> [Birthdate] -> [Birthdate]
+filterBirthdayBetween begin end =
+  filter (\bd ->
+    let d = date bd
+    in  (  d `isAfterOrEqualDayAndMonth` begin
+        && d `isBeforeOrEqualDayAndMonth` end
+        )
+  )
diff --git a/src/Date.hs b/src/Date.hs
index 8ab9fd2..63830d3 100644
--- a/src/Date.hs
+++ b/src/Date.hs
@@ -2,6 +2,8 @@ module Date
   ( Date(..)
   , getCurrentDate
   , sameDayAndMonth
+  , isBeforeOrEqualDayAndMonth
+  , isAfterOrEqualDayAndMonth
   , yearsGap
   ) where
 
@@ -29,5 +31,21 @@ sameDayAndMonth d1 d2 =
   && month d1 == month d2
   )
 
+isBeforeOrEqualDayAndMonth :: Date -> Date -> Bool
+isBeforeOrEqualDayAndMonth d1 d2 =
+  (  month d1 < month d2
+  || (  month d1 == month d2
+     && day d1 <= day d2
+     )
+  )
+
+isAfterOrEqualDayAndMonth :: Date -> Date -> Bool
+isAfterOrEqualDayAndMonth d1 d2 =
+  (  month d1 > month d2
+  || (  month d1 == month d2
+     && day d1 >= day d2
+     )
+  )
+
 yearsGap :: Date -> Date -> Int
 yearsGap d1 d2 = abs (year d2 - year d1)
diff --git a/src/Main.hs b/src/Main.hs
index 29e9698..d72bd95 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -10,7 +10,7 @@ import qualified Data.Text as T
 import qualified Data.Text.IO as T
 
 import Date (getCurrentDate)
-import Birthdate (filterBirthday)
+import Birthdate (Birthdate, filterBirthdayAt)
 import BirthdateParser (parseBirthdates)
 import Mail (mailSubject, mailBody)
 import SendMail (sendMail)
@@ -43,15 +43,19 @@ main = do
           , ":\n"
           , err
           ]
-    (Right birthdates, Right config) -> do
-      currentDate <- getCurrentDate
-      let birthdays = filterBirthday currentDate birthdates
-      if not (null birthdays)
-        then
-          sendMail
-            (mailTo config)
-            (mailFrom config)
-            (mailSubject birthdays)
-            (mailBody currentDate birthdays)
-        else
-          return ()
+    (Right birthdates, Right config) ->
+      sendNotificationForBirthdayToday birthdates config
+
+sendNotificationForBirthdayToday :: [Birthdate] -> Config -> IO ()
+sendNotificationForBirthdayToday birthdates config = do
+  currentDate <- getCurrentDate
+  let birthdays = filterBirthdayAt currentDate birthdates
+  if not (null birthdays)
+    then
+      sendMail
+        (mailTo config)
+        (mailFrom config)
+        (mailSubject birthdays)
+        (mailBody currentDate birthdays)
+    else
+      return ()
-- 
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