From f2ea4ff515f3f3b0f16616fb11df907ac7f60f47 Mon Sep 17 00:00:00 2001
From: "allbery.b" <allbery.b@gmail.com>
Date: Sun, 3 Aug 2014 04:06:01 +0200
Subject: debug-managehook

Ignore-this: 51f9255b496cca79e4a53e274c400ecc
A set of hooks, and convenience combinators, to help with ManageHook debugging.
Ordinary users may well want to use debugManageHookOn in normal configs,
specifying a key sequence which can be pressed before running a command in
order to capture debug information just for that command's main window.

This is especially useful when trying to diagnose issues such as programs
that do not play well with SpawnOn, or ManageHook matching on 'title' when
the program does not set the window title until after it is mapped.

darcs-hash:20140803020601-181ff-78e3735233c7af1d65d1aa3b2b6dbfead1a987b7.gz
---
 XMonad/Hooks/ManageDebug.hs | 100 ++++++++++++++++++++++++++++++++++++++++++++
 xmonad-contrib.cabal        |   1 +
 2 files changed, 101 insertions(+)
 create mode 100644 XMonad/Hooks/ManageDebug.hs

diff --git a/XMonad/Hooks/ManageDebug.hs b/XMonad/Hooks/ManageDebug.hs
new file mode 100644
index 0000000..acfb058
--- /dev/null
+++ b/XMonad/Hooks/ManageDebug.hs
@@ -0,0 +1,100 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Hooks.ManageDebug
+-- Copyright   :  (c) Brandon S Allbery KF8NH, 2014
+-- License     :  BSD3-style (see LICENSE)
+--
+-- Maintainer  :  allbery.b@gmail.com
+-- Stability   :  unstable
+-- Portability :  not portable
+--
+-- A @manageHook@ and associated @logHook@ for debugging 'ManageHook's.
+-- Simplest usage: wrap your xmonad config in the @debugManageHook@ combinator.
+-- Or use @debugManageHookOn@ for a triggerable version, specifying the
+-- triggering key sequence in 'XMonad.Util.EZConfig' syntax. Or use the
+-- individual hooks in whatever way you see fit.
+--
+-----------------------------------------------------------------------------
+--
+--
+
+module XMonad.Hooks.ManageDebug (debugManageHook
+                                ,debugManageHookOn
+                                ,manageDebug
+                                ,maybeManageDebug
+                                ,manageDebugLogHook
+                                ,debugNextManagedWindow
+                                ) where
+
+import           XMonad
+import           XMonad.Hooks.DebugStack
+import           XMonad.Util.DebugWindow
+import           XMonad.Util.EZConfig
+import qualified XMonad.Util.ExtensibleState                                                 as XS
+import           Control.Monad                            (when)
+
+-- persistent state for manageHook debugging to trigger logHook debugging
+data ManageStackDebug = MSD (Bool,Bool) deriving Typeable
+instance ExtensionClass ManageStackDebug where
+  initialValue = MSD (False,False)
+
+-- | A combinator to add full 'ManageHook' debugging in a single operation.
+debugManageHook :: XConfig l -> XConfig l
+debugManageHook cf = cf {logHook    = manageDebugLogHook <+> logHook    cf
+                        ,manageHook = manageDebug        <+> manageHook cf
+                        }
+
+-- | A combinator to add triggerable 'ManageHook' debugging in a single operation.
+--   Specify a key sequence as a string in 'XMonad.Util.EZConfig' syntax; press
+--   this key before opening the window to get just that logged.
+debugManageHookOn :: String -> XConfig l -> XConfig l
+debugManageHookOn key cf = cf {logHook    = manageDebugLogHook <+> logHook    cf
+                              ,manageHook = maybeManageDebug   <+> manageHook cf
+                              }
+                           `additionalKeysP`
+                           [(key,debugNextManagedWindow)]
+
+-- | Place this at the start of a 'ManageHook', or possibly other places for a
+--   more limited view. It will show the current 'StackSet' state and the new
+--   window, and set a flag so that @manageDebugLogHook@ will display the
+--   final 'StackSet' state.
+--
+--   Note that the initial state shows only the current workspace; the final
+--   one shows all workspaces, since your 'ManageHook' might use e.g. 'doShift',
+manageDebug :: ManageHook
+manageDebug = do
+  w <- ask
+  liftX $ do
+    trace "== manageHook; current stack =="
+    debugStackString >>= trace
+    ws <- debugWindow w
+    trace $ "new:\n  " ++ ws
+    XS.modify $ \(MSD (_,key)) -> MSD (True,key)
+  idHook
+
+-- | @manageDebug@ only if the user requested it with @debugNextManagedWindow@.
+maybeManageDebug :: ManageHook
+maybeManageDebug = do
+  go <- liftX $ do
+    MSD (log_,go') <- XS.get
+    XS.put $ MSD (log_,False)
+    return go'
+  if go then manageDebug else idHook
+
+-- | If @manageDebug@ has set the debug-stack flag, show the stack.
+manageDebugLogHook :: X ()
+manageDebugLogHook = do
+                       MSD (go,key) <- XS.get
+                       when go $ do
+                         trace "== manageHook; final stack =="
+                         debugStackFullString >>= trace
+                         XS.put $ MSD (False,key)
+                       idHook
+
+-- | Request that the next window to be managed be @manageDebug@-ed. This can
+--   be used anywhere an X action can, such as key bindings, mouse bindings
+--   (presumably with 'const'), 'startupHook', etc.
+debugNextManagedWindow :: X ()
+debugNextManagedWindow = XS.modify $ \(MSD (log_,_)) -> MSD (log_,True)
diff --git a/xmonad-contrib.cabal b/xmonad-contrib.cabal
index cd77fa2..698a40c 100644
--- a/xmonad-contrib.cabal
+++ b/xmonad-contrib.cabal
@@ -166,6 +166,7 @@ library
                         XMonad.Hooks.FloatNext
                         XMonad.Hooks.ICCCMFocus
                         XMonad.Hooks.InsertPosition
+                        XMonad.Hooks.ManageDebug
                         XMonad.Hooks.ManageDocks
                         XMonad.Hooks.ManageHelpers
                         XMonad.Hooks.Minimize
-- 
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