From b5f484cc7e943509fd0ebddb83d4ca988ecb1f58 Mon Sep 17 00:00:00 2001
From: Spencer Janssen <spencerjanssen@gmail.com>
Date: Sun, 21 Sep 2008 11:34:53 +0200
Subject: Prompt: add configurable history filters

darcs-hash:20080921093453-25a6b-131438cecc65038c592e99e60b98c878d39e01cd.gz
---
 XMonad/Prompt.hs | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to 'XMonad/Prompt.hs')

diff --git a/XMonad/Prompt.hs b/XMonad/Prompt.hs
index 0e54a4b..acea7bb 100644
--- a/XMonad/Prompt.hs
+++ b/XMonad/Prompt.hs
@@ -44,6 +44,9 @@ module XMonad.Prompt
     , decodeInput
     , encodeOutput
     , historyCompletion
+    -- * History filters
+    , deleteAllDuplicates
+    , deleteConsecutiveDuplicates
     ) where
 
 import Prelude hiding (catch)
@@ -109,11 +112,14 @@ data XPConfig =
         , position          :: XPPosition -- ^ Position: 'Top' or 'Bottom'
         , height            :: !Dimension -- ^ Window height
         , historySize       :: !Int       -- ^ The number of history entries to be saved
+        , historyFilter     :: [String] -> [String]
+                                          -- ^ a filter to determine which
+                                          -- history entries to remember
         , defaultText       :: String     -- ^ The text by default in the prompt line
         , autoComplete      :: Maybe Int  -- ^ Just x: if only one completion remains, auto-select it,
 	, showCompletionOnTab :: Bool     -- ^ Only show list of completions when Tab was pressed
                                           --   and delay by x microseconds
-        } deriving (Show, Read)
+        }
 
 data XPType = forall p . XPrompt p => XPT p
 
@@ -180,6 +186,7 @@ defaultXPConfig =
         , position          = Bottom
         , height            = 18
         , historySize       = 256
+        , historyFilter     = id
         , defaultText       = []
         , autoComplete      = Nothing
 	, showCompletionOnTab = False
@@ -808,3 +815,11 @@ uniqSort = toList . fromList
 --   from the query history stored in ~/.xmonad/history.
 historyCompletion :: ComplFunction
 historyCompletion x = fmap (filter (isInfixOf x) . Map.fold (++) []) readHistory
+
+-- | Functions to be used with the 'historyFilter' setting.
+-- 'deleteAllDuplicates' will remove all duplicate entries.
+-- 'deleteConsecutiveDuplicates' will remove duplicate elements which are
+-- immediately next to each other.
+deleteAllDuplicates, deleteConsecutiveDuplicates :: [String] -> [String]
+deleteAllDuplicates = nub
+deleteConsecutiveDuplicates = map head . group
-- 
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