2 files changed, 89 insertions, 0 deletions
diff --git a/app/Utils/Prompt.hs b/app/Utils/Prompt.hs
new file mode 100644
index 0000000..51b3f0c
--- /dev/null
+++ b/app/Utils/Prompt.hs
@@ -0,0 +1,50 @@
+-- |
+-- Copyright   : (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
+-- License     : MIT
+-- Maintainer  : Egor.Tensin@gmail.com
+-- Stability   : experimental
+-- Portability : portable
+
+module Utils.Prompt
+    ( withPrompt
+    , withoutPrompt
+    ) where
+
+import Control.Monad (void, when)
+import Control.Monad.Trans.Class  (lift)
+import Control.Monad.Trans.Except (ExceptT)
+import Data.Char     (toLower)
+import System.IO     (hFlush, stdout)
+
+prompt :: String -> IO String
+prompt msg = do
+    putStr msg
+    hFlush stdout
+    getLine
+
+promptYesNo :: String -> IO Bool
+promptYesNo msg = do
+    response <- map toLower <$> prompt msg
+    if response `elem` yeses
+        then return True
+        else if response `elem` noes
+            then return False
+            else promptToContinue
+  where
+    yeses = ["y", "yes"]
+    noes = ["n", "no"]
+
+promptToContinue :: IO Bool
+promptToContinue = promptYesNo "Continue? (y/n) "
+
+withPrompt :: String -> ExceptT IOError IO a -> ExceptT IOError IO Bool
+withPrompt msg m = do
+    lift $ do
+        putStr msg
+        hFlush stdout
+    agreed <- lift promptToContinue
+    when agreed $ void m
+    return agreed
+
+withoutPrompt :: ExceptT IOError IO a -> ExceptT IOError IO Bool
+withoutPrompt m = m >> return True
diff --git a/app/Utils/PromptMessage.hs b/app/Utils/PromptMessage.hs
new file mode 100644
index 0000000..37fc1e6
--- /dev/null
+++ b/app/Utils/PromptMessage.hs
@@ -0,0 +1,39 @@
+-- |
+-- Copyright   : (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+-- License     : MIT
+-- Maintainer  : Egor.Tensin@gmail.com
+-- Stability   : experimental
+-- Portability : Windows-only
+
+module Utils.PromptMessage
+    ( oldNewMessage
+    , newMessage
+    , wipeMessage
+    ) where
+
+import Text.Printf (printf)
+
+import qualified WindowsEnv
+
+oldNewMessage :: WindowsEnv.Profile -> WindowsEnv.VarName -> WindowsEnv.VarValue -> WindowsEnv.VarValue -> String
+oldNewMessage profile name oldValue newValue =
+    descrMsg ++ oldValueMsg ++ newValueMsg
+  where
+    profileKey = WindowsEnv.profileKeyPath profile
+    descrMsg = printf "Saving variable '%s' to '%s'...\n" name (show profileKey)
+    oldValueMsg = printf "\tOld value: %s\n" oldValue
+    newValueMsg = printf "\tNew value: %s\n" newValue
+
+newMessage :: WindowsEnv.Profile -> WindowsEnv.VarName -> WindowsEnv.VarValue -> String
+newMessage profile name newValue =
+    descrMsg ++ newValueMsg
+  where
+    profileKey = WindowsEnv.profileKeyPath profile
+    descrMsg = printf "Saving variable '%s' to '%s'...\n" name (show profileKey)
+    newValueMsg = printf "\tNew value: %s\n" newValue
+
+wipeMessage :: WindowsEnv.Profile -> WindowsEnv.VarName -> String
+wipeMessage profile name =
+    printf "Deleting variable '%s' from '%s'...\n" name (show profileKey)
+  where
+    profileKey = WindowsEnv.profileKeyPath profile