1 files changed, 30 insertions, 0 deletions
diff --git a/src/Update/UpdateEdition.elm b/src/Update/UpdateEdition.elm
new file mode 100644
index 0000000..911a4c1
--- /dev/null
+++ b/src/Update/UpdateEdition.elm
@@ -0,0 +1,30 @@
+module Update.UpdateEdition
+  ( updateEdition
+  , EditionAction(..)
+  ) where
+
+import Char (..)
+
+import Model.Edition.Edition (..)
+
+import Utils.List (..)
+
+type EditionAction =
+  DeleteLast
+  | AddChar KeyCode
+
+updateEdition : EditionAction -> Edition -> Edition
+updateEdition action edition =
+  case action of
+    DeleteLast ->
+      case maybeTail edition.chars of
+        Just tailChars ->
+          { edition | chars <- tailChars }
+        Nothing ->
+          edition
+    AddChar keyCode ->
+      case keyCodeToChar edition.kind keyCode of
+        Just char ->
+          { edition | chars <- char :: edition.chars }
+        Nothing ->
+          edition