From 16fca4f16f23364a1441c17ea023bc9744b286c0 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sun, 14 Feb 2016 03:11:33 +0300
Subject: allow adding/removing multiple paths at once

---
 AddPath.hs    | 24 +++++++++++++-----------
 RemovePath.hs | 30 +++++++++++++-----------------
 2 files changed, 26 insertions(+), 28 deletions(-)

diff --git a/AddPath.hs b/AddPath.hs
index 8ef00c5..e17adc9 100644
--- a/AddPath.hs
+++ b/AddPath.hs
@@ -6,7 +6,7 @@
 
 module Main ( main ) where
 
-import Control.Monad ( when )
+import Control.Monad ( mapM_, when )
 import System.Console.GetOpt
 import System.Environment ( getArgs, getProgName )
 import System.Exit ( exitFailure, exitSuccess )
@@ -20,17 +20,19 @@ main = do
   case getOpt Permute optionDescription rawArgs of
     (actions, args, []) -> do
       options <- foldl (>>=) (return defaultOptions) actions
-      case args of
-        [path] -> addPath path options
-        _ -> invalidNumberOfArguments
+      addPath args options
     (_, _, errorMessages) -> exitWithUsageErrors errorMessages
 
-addPath :: String -> Options -> IO ()
-addPath path options = do
-  oldVal <- EnvUtils.getEnv $ name options
-  when (notElem path $ EnvUtils.splitPaths oldVal) $ do
-    oldValFromReg <- EnvUtils.queryFromRegistry (env options) (name options)
-    EnvUtils.saveToRegistryWithPrompt (env options) (name options) $ EnvUtils.joinPaths [path,oldValFromReg]
+addPath :: [String] -> Options -> IO ()
+addPath paths options = do
+  missingPaths <- dropIncludedPaths paths
+  when (not $ null missingPaths) $ do
+    oldPath <- EnvUtils.queryFromRegistry (env options) (name options)
+    EnvUtils.saveToRegistryWithPrompt (env options) (name options) $ EnvUtils.joinPaths $ missingPaths ++ [oldPath]
+      where
+        dropIncludedPaths paths = do
+          currentPath <- EnvUtils.getEnv $ name options
+          return $ filter (flip notElem $ EnvUtils.splitPaths currentPath) paths
 
 data Options = Options { name :: String
                        , env :: EnvUtils.RegistryBasedEnvironment }
@@ -48,7 +50,7 @@ buildHelpMessage = do
       buildHeader :: IO String
       buildHeader = do
         progName <- getProgName
-        return $ "Usage: " ++ progName ++ " [OPTIONS...] PATH\nOptions:"
+        return $ "Usage: " ++ progName ++ " [OPTIONS...] [PATH...]\nOptions:"
 
 exitWithHelpMessage :: a -> IO b
 exitWithHelpMessage _ = do
diff --git a/RemovePath.hs b/RemovePath.hs
index 5fd6d6d..2e8fd01 100644
--- a/RemovePath.hs
+++ b/RemovePath.hs
@@ -20,27 +20,23 @@ main = do
   case getOpt Permute optionDescription rawArgs of
     (actions, args, []) -> do
       options <- foldl (>>=) (return defaultOptions) actions
-      case args of
-        [path] -> removePath path options
-        _ -> invalidNumberOfArguments
+      removePath args options
     (_, _, errorMessages) -> exitWithUsageErrors errorMessages
 
-removePath :: String -> Options -> IO ()
-removePath path options = do
+removePath :: [String] -> Options -> IO ()
+removePath paths options = do
   let varName = name options
   userVal <- EnvUtils.queryFromRegistry EnvUtils.CurrentUserEnvironment varName
   let userValParts = EnvUtils.splitPaths userVal
-  if path `elem` userValParts
-    then do
-      let newUserValParts = filter (/= path) userValParts
-      EnvUtils.saveToRegistryWithPrompt EnvUtils.CurrentUserEnvironment varName $ EnvUtils.joinPaths newUserValParts
-    else do
-      when (global options) $ do
-        globalVal <- EnvUtils.queryFromRegistry EnvUtils.AllUsersEnvironment varName
-        let globalValParts = EnvUtils.splitPaths globalVal
-        when (path `elem` globalValParts) $ do
-          let newGlobalValParts = filter (/= path) globalValParts
-          EnvUtils.saveToRegistryWithPrompt EnvUtils.AllUsersEnvironment varName $ EnvUtils.joinPaths newGlobalValParts
+  let newUserValParts = filter (`notElem` paths) userValParts
+  when (length userValParts /= length newUserValParts) $ do
+    EnvUtils.saveToRegistryWithPrompt EnvUtils.CurrentUserEnvironment varName $ EnvUtils.joinPaths newUserValParts
+  when (global options) $ do
+    globalVal <- EnvUtils.queryFromRegistry EnvUtils.AllUsersEnvironment varName
+    let globalValParts = EnvUtils.splitPaths globalVal
+    let newGlobalValParts = filter (`notElem` paths) globalValParts
+    when (length globalValParts /= length newGlobalValParts) $ do
+      EnvUtils.saveToRegistryWithPrompt EnvUtils.AllUsersEnvironment varName $ EnvUtils.joinPaths newGlobalValParts
 
 data Options = Options { name :: String
                        , global :: Bool }
@@ -58,7 +54,7 @@ buildHelpMessage = do
       buildHeader :: IO String
       buildHeader = do
         progName <- getProgName
-        return $ "Usage: " ++ progName ++ " [OPTIONS...] PATH\nOptions:"
+        return $ "Usage: " ++ progName ++ " [OPTIONS...] [PATH...]\nOptions:"
 
 exitWithHelpMessage :: a -> IO b
 exitWithHelpMessage _ = do
-- 
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