Adding password manager for my own good

lib/KeyBindings.hs

@@ -24,6 +24,9 @@ import qualified Solarized as S
 import qualified Scratchpad as R
 import qualified XMonad.StackSet as W
 
+-- Custom (in libs)
+import Password (passPrompt)
+
 modify :: XConfig l -> XConfig l
 modify conf = conf
   { modMask = mod4Mask -- Use the "Win" key for the mod key
@@ -57,6 +60,7 @@ modify conf = conf
     , ("M-p n", switchProjectPrompt promptConfig)
     , ("M-p r", renameProjectPrompt promptConfig)
     , ("M-p s", shellPrompt promptConfig)
+    , ("M-d", passPrompt promptConfig)
     -- Scratchpads
     , ("M-p p", namedScratchpadAction R.pads "htop")
     ]

lib/Password.hs

@@ -0,0 +1,56 @@
+-- Initially from
+-- https://github.com/MasseR/xmonad-masser/blob/master/src/XMonad/Password.hs
+
+module Password (passGeneratePrompt, passPrompt) where
+
+import           Control.Monad.Trans   (liftIO)
+import           Data.Function         (on)
+import           Data.List             (foldl', scanl', sort, sortBy)
+import           System.Directory      (getHomeDirectory)
+import           System.FilePath.Posix (dropExtension, takeExtension, (</>))
+import           System.Posix.Env      (getEnv)
+import           XMonad.Core
+import           XMonad.Prompt
+import           XMonad.Util.Run       (runProcessWithInput)
+
+newtype Pass = Pass { passLabel :: String }
+
+-- Rosetta code levenshtein
+levenshtein :: String -> String -> Int
+levenshtein s1 s2 = last $ foldl' transform [0..length s1] s2
+  where
+    transform [] _ = []
+    transform ns@(n:ns1) c = scanl' calc (n+1) $ zip3 s1 ns ns1
+      where
+        calc z (c1, x, y) = minimum [y+1, z+1, x + (fromEnum (c1 /= c) * 2)]
+
+instance XPrompt Pass where
+  showXPrompt p = passLabel p <> ": "
+  commandToComplete _ = id
+  nextCompletion _ = getNextCompletion
+
+passGeneratePrompt :: XPConfig -> X ()
+passGeneratePrompt _ = return () -- Not implemented
+
+passPrompt :: XPConfig -> X ()
+passPrompt = mkPassPrompt "Select password" selectPassword
+
+mkPassPrompt :: String -> (String -> X ()) -> XPConfig -> X ()
+mkPassPrompt label f conf = do
+  -- I'm just sorting here, but could use some kind of fuzzy matching instead, but it requires a bit more effort
+  passwords <- sort <$> liftIO getPasswords
+  -- Other change, use infixof instead of prefixof
+  mkXPrompt (Pass label) conf (\input -> pure (sortBy (compare `on` levenshtein input) . filter (consumes input) $ passwords)) f
+  where
+    consumes [] _ = True -- everything consumed
+    consumes (_:_) [] = False -- all not consumed
+    consumes (a:xs) (a':ys) | a == a' = consumes xs ys
+                            | otherwise = consumes (a:xs) ys
+    getPasswords = do
+      passwordStoreDir <- (</> "pass") <$> getHomeDirectory
+      files <- runProcessWithInput "find" [ passwordStoreDir, "-type", "f", "-name", "*.gpg", "-printf", "%p\n"] []
+      return . lines $ files
+
+selectPassword :: String -> X ()
+selectPassword pass = spawn $ "gpg --decrypt " ++ pass ++ " | /home/eeva/.nix-profile/bin/copy"
+