X.P.OrgMode: Remove the need for todoKeywords argument

This is (i) much simpler to use and (ii) helps us with refiling.  Emacs
will ignore todo keywords _that it knows_ when refiling, but when
started in batch-mode it doesn't know a whole lot.  One would need to
thread the `todoKeywords' through to `refile' and then set
`org-todo-keywords' or a similar variable, which does not sound like a
good experience.  Hence, falling back to showing the todo keyword to the
user when deciding upon a headline sounds acceptable.

XMonad/Prompt/OrgMode.hs

@@ -162,7 +162,7 @@ automatically
 <https://orgmode.org/manual/Refile-and-Copy.html refile>
 the generated item under a heading of choice.  For example, binding
 
-> orgPromptRefile def ["TODO", "DONE", "SOMEDAY"] "TODO" "todos.org"
+> orgPromptRefile def "TODO" "todos.org"
 
 to a key will first pop up an ordinary prompt that works exactly like
 'orgPrompt', and then query the user for an already existing heading
@@ -171,12 +171,6 @@ prompt is cancelled, the heading will appear in the org file as normal
 (i.e., at the end of the file); otherwise, it gets refiled under the
 selected heading.
 
-The second argument to 'orgPromptRefile'—in this case, @["TODO", "DONE",
-"SOMEDAY"]@—says which keywords you want to have recognised as todo
-keywords.  This means that they won't be shown in the prompt when
-selecting headings.  This should probably be at least close to the value
-of @org-todo-keywords@.
-
 -}
 
 {- TODO
@@ -255,14 +249,8 @@ instance XPrompt RefilePrompt where
 -- instructions in "XMonad.Util.Run#g:EDSL"; more specifically, by
 -- changing the 'XMonad.Util.Run.emacs' field of
 -- 'XMonad.Util.Run.ProcessConfig'.
-orgPromptRefile
-  :: XPConfig
-  -> [String]  -- ^ List of strings to be treated as todo keywords.
-               --   Should reflect the value of @org-todo-keywords@.
-  -> String
-  -> FilePath
-  -> X ()
-orgPromptRefile xpc todoPrefixes str fp = do
+orgPromptRefile :: XPConfig -> String -> FilePath -> X ()
+orgPromptRefile xpc str fp = do
   orgCfg <- mkOrgCfg NoClpSupport str fp
 
   -- NOTE: Ideally we would just use System.IO.readFile' here
@@ -278,7 +266,7 @@ orgPromptRefile xpc todoPrefixes str fp = do
   when notCancelled $
     -- If the user didn't cancel, try to parse the org file and offer to
     -- refile the entry if possible.
-    whenJust (runParser (pOrgFile todoPrefixes) fileContents) $ \headings ->
+    whenJust (runParser pOrgFile fileContents) $ \headings ->
       mkXPromptWithReturn Refile xpc (completeHeadings headings) pure >>= \case
         Nothing     -> pure ()
         Just parent -> refile parent (orgFile orgCfg)
@@ -610,25 +598,19 @@ pNumBetween lo hi = do
 data Heading = Heading
   { level       :: Natural
     -- ^ Level of the Org heading; i.e., the number of leading stars.
-  , todoType    :: String
-    -- ^ Type of the Org heading.  This is some todo keyword used as a
-    -- prefix to mark the heading as such.
   , headingText :: String
-    -- ^ The heading text without its level and prefix keyword.
+    -- ^ The heading text without its level.
   }
 
 -- | Naïvely parse an Org file.  At this point, only the headings are
 -- parsed into a non-nested list (ignoring parent-child relations); no
 -- further analysis is done on the individual lines themselves.
-pOrgFile :: [String] -> Parser [Heading]
-pOrgFile = many . pHeading
+pOrgFile :: Parser [Heading]
+pOrgFile = many pHeading
 
-pHeading :: [String] -> Parser Heading
-pHeading todoPrefixes = skipSpaces *> do
+pHeading :: Parser Heading
+pHeading = skipSpaces *> do
   level       <- genericLength <$> munch1 (== '*') <* " "
-  todoType    <- option "" $ do word <- munch1 (/= ' ') <* skipSpaces
-                                guard (word `elem` todoPrefixes)
-                                pure word
   headingText <- pLine
   void $ many (pLine >>= \line -> guard (isNotHeading line) $> line) -- skip body
   pure Heading{..}