fix compiler warnings + refactoring

1 files changed, 33 insertions, 0 deletions

diff --git a/apps/PromptMessage.hs b/apps/PromptMessage.hs
new file mode 100644
index 0000000..226a090
--- /dev/null
+++ b/apps/PromptMessage.hs
@@ -0,0 +1,33 @@
+{-
+ - 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 PromptMessage
+    ( engraveMessage
+    , wipeMessage
+    ) where
+
+import Data.Maybe  (fromJust, isJust)
+import Text.Printf (printf)
+
+import qualified Windows.Environment as Env
+
+engraveMessage :: Env.Profile -> Env.VarName -> Maybe Env.VarValue -> Env.VarValue -> String
+engraveMessage profile name oldValue newValue =
+    warning ++ values
+  where
+    warning = printf "Saving variable '%s' to '%s'...\n" name $ Env.profileKeyPath profile
+
+    values
+        | isJust oldValue = oldValueMsg ++ newValueMsg
+        | otherwise       = valueMsg
+
+    oldValueMsg = printf "\tOld value: %s\n" $ fromJust oldValue
+    newValueMsg = printf "\tNew value: %s\n" newValue
+    valueMsg = printf "\tValue: %s\n" newValue
+
+wipeMessage :: Env.Profile -> Env.VarName -> String
+wipeMessage profile name =
+    printf "Deleting variable '%s' from '%s'...\n" name $ Env.profileKeyPath profile