From 60dafc9de224e2f1e53826858e5335916dc6d8c8 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter@cs.unisa.edu.au>
Date: Thu, 20 Dec 2007 12:21:34 +1030
Subject: [PATCH] Add --loop to "xinput list". Re-prints devices when hierarchy
 changes.

---
 src/list.c   | 32 +++++++++++++++++++++++++-------
 src/xinput.c | 12 ++++++------
 2 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/src/list.c b/src/list.c
index d1bc086..85b766d 100644
--- a/src/list.c
+++ b/src/list.c
@@ -115,17 +115,35 @@ list(Display	*display,
     XDeviceInfo		*info;
     int			loop;
     int                 shortformat = False;
+    int                 daemon = False;
 
     shortformat = (argc == 1 && strcmp(argv[0], "--short") == 0);
+    daemon = (argc == 1 && strcmp(argv[0], "--loop") == 0);
 
-    if (argc == 0 || shortformat) {
+    if (argc == 0 || shortformat || daemon) {
 	int		num_devices;
-
-	info = XListInputDevices(display, &num_devices);
-
-	for(loop=0; loop<num_devices; loop++) {
-	    print_info(info+loop, shortformat);
-	}
+        XEvent  ev;
+        int     daemon = argc;
+
+        if (daemon)
+        {
+            XiSelectEvent(display, DefaultRootWindow(display),
+                          XI_DeviceHierarchyChangedMask);
+        }
+
+        do {
+            info = XListInputDevices(display, &num_devices);
+            for(loop=0; loop<num_devices; loop++) {
+                print_info(info+loop, shortformat);
+            }
+
+            /* just wait for the next generic event to come along */
+            while (daemon && !XNextEvent(display, &ev))
+            {
+                if (ev.type == GenericEvent)
+                    break;
+            }
+        } while(daemon);
     } else {
 	int	ret = EXIT_SUCCESS;
 
diff --git a/src/xinput.c b/src/xinput.c
index 68f7f0b..47603d2 100644
--- a/src/xinput.c
+++ b/src/xinput.c
@@ -1,6 +1,6 @@
 /*
  * Copyright 1996 by Frederic Lepied, France. <Frederic.Lepied@sugix.frmug.org>
- *                                                                            
+ *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is  hereby granted without fee, provided that
  * the  above copyright   notice appear  in   all  copies and  that both  that
@@ -9,8 +9,8 @@
  * advertising or publicity pertaining to distribution of the software without
  * specific,  written      prior  permission.     Frederic  Lepied   makes  no
  * representations about the suitability of this software for any purpose.  It
- * is provided "as is" without express or implied warranty.                   
- *                                                                            
+ * is provided "as is" without express or implied warranty.
+ *
  * FREDERIC  LEPIED DISCLAIMS ALL   WARRANTIES WITH REGARD  TO  THIS SOFTWARE,
  * INCLUDING ALL IMPLIED   WARRANTIES OF MERCHANTABILITY  AND   FITNESS, IN NO
  * EVENT  SHALL FREDERIC  LEPIED BE   LIABLE   FOR ANY  SPECIAL, INDIRECT   OR
@@ -32,7 +32,7 @@ typedef int (*prog)(
 #endif
 );
 
-typedef struct 
+typedef struct
 {
     char	*func_name;
     char	*arg_desc;
@@ -66,7 +66,7 @@ static entry drivers[] =
      set_mode
     },
     {"list",
-     "[--short || <device name>...]",
+     "[--loop || --short || <device name>...]",
      list
     },
     {"query-state",
@@ -106,7 +106,7 @@ is_xinput_present(Display	*display)
 {
     XExtensionVersion	*version;
     Bool		present;
-    
+
     version = XGetExtensionVersion(display, INAME);
 
     if (version && (version != (XExtensionVersion*) NoSuchExtension)) {
-- 
2.56.0