allow user to specify temporary alternate master password

ChangeLog.md

@@ -3,6 +3,7 @@
 ## current
 
 - set maximum version of transformers package
+- allow user to specifiy a temporary master password to retrieve a password
 
 ## 0.3.0.2
 

app/UI.hs

@@ -27,7 +27,7 @@ module UI (getMasterPass, mainMenu) where
 import Control.Monad (when)
 import Control.Monad.Trans.Class (lift)
 import qualified Control.Monad.Trans.State as S
-import Lens.Micro (over, set, (^.))
+import Lens.Micro (over, set, (^.), (.~))
 import Lens.Micro.Extras (view)
 import System.Console.HCL
   ( Request
@@ -162,6 +162,7 @@ selectServ xs = menu "Select Service" $
 servMenu :: String -> S.StateT Status IO ()
 servMenu x = menu x
   [ ( "show password",           showPass x >> servMenu x )
+  , ( "show alternate password", showAltPass x            )
   , ( "edit password",           editPassMenu x           )
   , ( "remove service",          removeServ x             )
   , ( "rename service",          renameServ x             )
@@ -225,16 +226,25 @@ doEditPolicy x = withService x mainMenu $ \d -> do
   editPassMenu x
 
 showPass :: String -> S.StateT Status IO ()
-showPass x = do
+showPass x = withService x
-  lift $ putStrLn ""
-  withService x
   (lift $ putStrLn "The service could not be found in the database.") $
   \d -> do
+    lift $ putStrLn ""
     mp <- S.gets $ view masterPass
     lift $ putStrLn $ case pwGenerate mp d of
       Nothing -> "The password data were not valid."
       Just pw -> "password for " ++ x ++ ": " ++ pw
 
+showAltPass :: String -> S.StateT Status IO ()
+showAltPass srv = do
+  lift $ putStrLn ""
+  old <- S.gets $ view masterPass
+  Just new <- lift $ runRequest $ required $ prompt "alternate master password: " reqPassword
+  S.modify $ masterPass .~ new
+  showPass srv
+  S.modify $ masterPass .~ old
+  servMenu srv
+
 -- TODO: refactor this monstrosity
 editPolicy :: PWPolicy -> Request PWPolicy
 editPolicy policy = do