1 files changed, 25 insertions, 10 deletions
diff --git a/src/Update/UpdateTimerEdition.elm b/src/Update/UpdateTimerEdition.elm
index cff39f7..e9493eb 100644
--- a/src/Update/UpdateTimerEdition.elm
+++ b/src/Update/UpdateTimerEdition.elm
@@ -1,19 +1,34 @@
 module Update.UpdateTimerEdition
   ( updateTimerEdition
+  , TimerEditionAction(..)
   ) where
 
 import Char (..)
 
 import Model.TimerEdition (..)
 
-updateTimerEdition : Maybe Char -> TimerEdition -> TimerEdition
-updateTimerEdition maybeChar timerEdition =
-  case maybeChar of
-    Just char ->
-      if isDigit char
-        then
-          { timerEdition | numbers <- char :: timerEdition.numbers }
-        else
+import Utils.List (..)
+
+type TimerEditionAction =
+  DeleteLast
+  | AddNumber KeyCode
+
+updateTimerEdition : TimerEditionAction -> TimerEdition -> TimerEdition
+updateTimerEdition action timerEdition =
+  case action of
+    DeleteLast ->
+      case maybeTail timerEdition.numbers of
+        Just tailNumbers ->
+          { timerEdition | numbers <- tailNumbers }
+        Nothing ->
+          timerEdition
+    AddNumber keyCode ->
+      case keyCodeToNumberChar keyCode of
+        Just char ->
+          if isDigit char
+            then
+              { timerEdition | numbers <- char :: timerEdition.numbers }
+            else
+              timerEdition
+        Nothing ->
           timerEdition
-    Nothing ->
-      timerEdition