1 files changed, 31 insertions, 0 deletions
diff --git a/apps/Banner.hs b/apps/Banner.hs
new file mode 100644
index 0000000..c25741b
--- /dev/null
+++ b/apps/Banner.hs
@@ -0,0 +1,31 @@
+{-
+ - Copyright 2016 Egor Tensin <Egor.Tensin@gmail.com>
+ - This file is licensed under the terms of the MIT License.
+ - See LICENSE.txt for details.
+-}
+
+module Banner
+    ( engraveBanner
+    , wipeBanner
+    ) where
+
+import Data.Maybe  (fromJust, isJust)
+import Text.Printf (printf)
+
+import qualified Windows.Environment as Env
+
+engraveBanner :: Env.Profile -> Env.VarName -> Maybe Env.VarValue -> Env.VarValue -> String
+engraveBanner profile name oldValue newValue =
+    warning ++ valuesStr
+  where
+    warning = printf "Saving variable '%s' to '%s'...\n" name (Env.profileKeyPath profile)
+    valuesStr
+        | isJust oldValue = oldValueStr ++ newValueStr
+        | otherwise       = theValueStr
+    oldValueStr = printf "\tOld value: %s\n" $ fromJust oldValue
+    newValueStr = printf "\tNew value: %s\n" newValue
+    theValueStr = printf "\tValue: %s\n" newValue
+
+wipeBanner :: Env.Profile -> Env.VarName -> String
+wipeBanner profile name =
+    printf "Deleting variable '%s' from '%s'...\n" name (Env.profileKeyPath profile)