implement dynamic changing of working directory

src/XMonad/Custom/TopicSpace.hs

@@ -6,6 +6,8 @@ module XMonad.Custom.TopicSpace (
   , currentTopicConfig
   , goto
   , spawnInTopicDir
+  , setTopicDir
+  , promptSetTopicDir
   ) where
 
 
@@ -43,12 +45,14 @@ module XMonad.Custom.TopicSpace (
 --
 --
 
--- import qualified Data.Map.Strict as M
+import Data.Map
 import qualified XMonad.Util.ExtensibleState as XS
--- import qualified XMonad.StackSet as W
+import qualified XMonad.StackSet as W
 
 import XMonad
 import XMonad.Actions.TopicSpace
+import XMonad.Prompt
+import XMonad.Prompt.Workspace
 
 
 -- | An alias for topicNames.
@@ -84,15 +88,19 @@ instance ExtensionClass StoreTopicConfig where
 topicConfig :: StoreTopicConfig -> TopicConfig
 topicConfig (StoreTopicConfig tc) = tc
 
--- | Put initial topic Config into X state at startup
--- Add this to the XConfig startupHook
-topicStartupHook :: TopicConfig -> X ()
-topicStartupHook = XS.put . StoreTopicConfig
+-- | Update the value of the topic config in the X state
+updateTopicConfig :: TopicConfig -> X ()
+updateTopicConfig = XS.put . StoreTopicConfig
 
 -- | Retrieve the current topic config from the X state
 currentTopicConfig :: X TopicConfig
 currentTopicConfig = fmap topicConfig XS.get
 
+-- | Put initial topic Config into X state at startup
+-- Add this to the XConfig startupHook
+topicStartupHook :: TopicConfig -> X ()
+topicStartupHook = updateTopicConfig
+
 
 -------------------------------------------
 -- | These are the real utilities that we aimed for
@@ -112,3 +120,16 @@ spawnInTopicDir cmd = do
   tc <- currentTopicConfig
   dir <- currentTopicDir tc
   spawn $ "cd " ++ dir ++ "; " ++ cmd
+
+-- | Set the working directory of the current topic
+setTopicDir :: Dir -> X ()
+setTopicDir dir = do
+  ws <- gets (W.currentTag . windowset)
+  tc <- currentTopicConfig
+  updateTopicConfig tc {
+    topicDirs = insert ws dir $ topicDirs tc
+  }
+
+-- | Prompt for the new working directory
+promptSetTopicDir :: XPConfig -> X ()
+promptSetTopicDir xpc = workspacePrompt xpc setTopicDir