Initial import of vwm1 from published source tgz

 - Basic window management, window resizing, virtual desktops and shelf
   implementation
 - Simple double fork execution of launched clients

8 files changed, 2446 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f31737e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+vwm:	vwm.c vwm.h list.h colors.def launchers.def Makefile
+	$(CC) -Wall -o vwm vwm.c -lX11 #-g -DTRACE
+
+clean:
+	rm -f vwm
diff --git a/TODO b/TODO
new file mode 100644
index 0000000..a073025
--- /dev/null
+++ b/TODO
@@ -0,0 +1,90 @@
+BUGS:
+
+- Audit the code for memory leaks, I don't clean up things diligently on
+  destroy of things, especially surrounding X resources I presume.
+
+- There seems to be a problem with automatically focusing the remaining window
+  when the focused window is unmanaged.  Seems like I can simply repro. this by
+  starting iceweasel in an empty desktop.  It seems to be due to the 10x10 plugin
+  container window, why are we tripped up by this little window?  Why is this
+  window managed but not focusable? fucking X
+
+- Shelving a window doesn't focus it in the shelf context (is this limited to
+  only migration shelving?)
+
+- A floating window in the shelf, even when rendered as focused, doesn't behave
+  as it's focused.... this is really annoying.  I really need to formalize the
+  multi-window (new window) behavior within the shelf, it's totally undefined
+  currently, I just avoid launching things in the shelf and don't run apps which
+  create windows from within it.
+
+  ... 
+
+  Window creation while in the shelf is still a bit odd.  The shelf isn't
+  intended to be a multi-window context, but it probably makes sense to
+  allow temporary situations on new windows in the shelf where windows
+  coexist/potentially overlap.  In such a situation, the new window should
+  be mapped and raised but not focused, as well as being flagged as shelved.
+  Focusing the newly created window via Mod1+Tab or a click-to-focus should
+  not unmap the currently focused window, but should focus the new window,
+  temporarily adopting virtual-desktop behavior within the shelf.  If the
+  window is closed/destroyed, the previously focused shelved window resumes
+  focus.  If the shelf is exited and reentered, the newly created and
+  shelved window becomes the exclusively mapped and focused window.  The
+  multi-window state within the shelf is a transient one which ceases to
+  occur the moment the shelf context is left or a subsequent Alt+Tab further
+  cycles the focused shelf, unmapping the currently mapped windows.
+
+- Mod1+d destruction of an empty virtual desktop should probably require double
+  press of the 'd', and perhaps a visual indicator of emminent destruction after
+  the initial 'd'.
+
+
+FEATURES:
+
+- It would be useful if fullscreened windows obscured their border when they are
+  not obscured, as-is I lose a pixel on each edge in fullscreen xterms just so I
+  can see if the window is focused or not via the border color.  This is only
+  appreciated when focus is potentially ambiguous.  Come up with a good approach
+  which allows obstruction of the border while still showing the border in
+  potentially ambiguous situations.
+
+- Mod1+enter currently toggles between the currently user-specified (starts out
+  at client-configured) dimensions, and full-screen.  I think it would be useful
+  to support 3 states, the clients originally configured dimensions, the
+  user-specified dimensions (if they have been varied from the client-configured
+  dimensions) and full-screen.  This needs more thought, because it might not 
+  be very intuitive to sometimes have 3 persisted window states vs. 2, depending
+  on if the user has reconfigured the window dimensions, perhaps it should just
+  always be 3 but sometimes 2 of them are identical.
+
+- Mod1+right click resizing should insert a short delay before actually applying
+  motion events for resizing, this better facilitates the use case of
+  click-focusing without raising, without accidental resizes occuring.  This
+  window of time could also be leveraged to discover on what axis the resize is
+  to occur (compound vs x vs y).  The resize outcome of the motion events which
+  occur in this delay period should still become realized rather than discarded,
+  should the resize last long enough to become realized rather than suppressed
+  and treated as only a focus without raise event.
+
+- Window cycling should probably be reversible (shift+Mod1+Tab?)
+
+- Window placement is static, at least cascade, preferably intelligent
+  placement resorting to cascade when the desktop is filled.  I actually like how
+  wmaker 'auto mode' tries to fill open spaces with window placement then falls
+  back to cascade once no open spaces exist to accomodate the created window's
+  preferred size.
+
+- Virtual desktop genesis needs to query the user for the name, and create a
+  full-screen xterm running screen -S $desktopname for the root (or something)
+
+- Implement screen lock (right now I use xlock, I want something integrated which
+  does the following:
+  * disable sysrq on screen lock via /proc/sys/kernel/sysrq, restores sysrq on unlock
+
+  * disable VT switching on screen lock (unsure how right now), restore VT switching
+    on unlock
+
+  * if possible, disable ctrl-alt-backspace, allowing me to run Xorg with this enabled
+    without making my desktop totally insecure.  When unlocked I like this ability, but
+    when locked it can't be available for obvious reasons.
diff --git a/colors.def b/colors.def
new file mode 100644
index 0000000..c71479a
--- /dev/null
+++ b/colors.def
@@ -0,0 +1,5 @@
+color(focused_window_border, "Green")
+color(shelved_window_border, "purple")
+color(unfocused_window_border, "DarkGray")
+color(rubberband, "Orange")
+color(logo, "LimeGreen")
diff --git a/launchers.def b/launchers.def
new file mode 100644
index 0000000..428e5f9
--- /dev/null
+++ b/launchers.def
@@ -0,0 +1,6 @@
+/* it's up to you to ensure you don't conflict with the global VWM keys */
+/* keysym, argv list */
+launcher(XK_x, "/usr/bin/xterm")
+launcher(XK_b, "/usr/bin/iceweasel", "-ProfileManager", "-no-remote")
+launcher(XK_g, "/usr/bin/gimp")
+launcher(XK_period, "/usr/local/bin/xlock")
diff --git a/list.h b/list.h
new file mode 100644
index 0000000..2a0e6e2
--- /dev/null
+++ b/list.h
@@ -0,0 +1,240 @@
+#ifndef __LIST_H
+#define __LIST_H
+
+/* linux kernel linked list interface */
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+typedef struct list_head {
+	struct list_head *next, *prev;
+} list_head_t;
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+#define INIT_LIST_HEAD(ptr) do { \
+	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries. 
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *new,
+			      struct list_head *prev,
+			      struct list_head *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head, head->next);
+}
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head *prev, struct list_head *next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty on entry does not return true after this, the entry is in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	entry->next = (void *) 0;
+	entry->prev = (void *) 0;
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static inline void list_del_init(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	INIT_LIST_HEAD(entry); 
+}
+
+/**
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+        __list_del(list->prev, list->next);
+        list_add(list, head);
+}
+
+/**
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+				  struct list_head *head)
+{
+        __list_del(list->prev, list->next);
+        list_add_tail(list, head);
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(struct list_head *head)
+{
+	return head->next == head;
+}
+
+static inline void __list_splice(struct list_head *list,
+				 struct list_head *head)
+{
+	struct list_head *first = list->next;
+	struct list_head *last = list->prev;
+	struct list_head *at = head->next;
+
+	first->prev = head;
+	head->next = first;
+
+	last->next = at;
+	at->prev = last;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+	if (!list_empty(list))
+		__list_splice(list, head);
+}
+
+/**
+ * list_splice_init - join two lists and reinitialise the emptied list.
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_init(struct list_head *list,
+				    struct list_head *head)
+{
+	if (!list_empty(list)) {
+		__list_splice(list, head);
+		INIT_LIST_HEAD(list);
+	}
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+/**
+ * list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @head:	the head for your list.
+ */
+#define list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); \
+        	pos = pos->next)
+/**
+ * list_for_each_prev	-	iterate over a list backwards
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev(pos, head) \
+	for (pos = (head)->prev; pos != (head); \
+        	pos = pos->prev)
+        	
+/**
+ * list_for_each_safe	-	iterate over a list safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
+
+/**
+ * list_for_each_entry	-	iterate over list of given type
+ * @pos:	the type * to use as a loop counter.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = list_entry((head)->next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop counter.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+
+#endif
diff --git a/vwm.c b/vwm.c
new file mode 100644
index 0000000..e7a1a5e
--- /dev/null
+++ b/vwm.c
@@ -0,0 +1,1376 @@
+/*
+ *  VWM - Vito's Window Manager, a minimal, non-reparenting X11 window manager
+ *
+ *  Copyright (C) 2012  Vito Caputo - <vcaputo@gnugeneration.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Work started 8/3/2012, in the form of research into creating WM's using xcb,
+ * clearly I decided to just use Xlib instead at some point, and here we are.
+ */
+
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/cursorfont.h>
+#include <X11/Xatom.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "vwm.h"
+
+#define WINDOW_BORDER_WIDTH			1
+#define WINDOW_CASCADE_DELTA			100
+
+typedef enum _vwm_context_focus_t {
+	VWM_CONTEXT_FOCUS_OTHER = 0,
+	VWM_CONTEXT_FOCUS_DESKTOP,
+	VWM_CONTEXT_FOCUS_SHELF
+} vwm_context_focus_t;
+
+
+static LIST_HEAD(desktops);							/* global list of all (virtual) desktops in spatial created-in order */
+static LIST_HEAD(desktops_mru);							/* global list of all (virtual) desktops in MRU order */
+static LIST_HEAD(windows);							/* global list of all managed windows kept in MRU order */
+static vwm_desktop_t		*focused_desktop = NULL;			/* currently focused (virtual) desktop */
+static vwm_window_t		*focused_shelf = NULL;				/* currently focused shelved window */
+static vwm_context_focus_t	focused_context = VWM_CONTEXT_FOCUS_DESKTOP;	/* currently focused context */ 
+static int			key_is_grabbed = 0;				/* flag for tracking keyboard grab state */
+
+static Display			*display;
+static Colormap			cmap;
+
+#define color(_sym, _str) \
+static XColor			_sym ## _color;
+#include "colors.def"
+#undef color
+
+static int			screen_num;
+static GC			gc;
+static Atom			wm_delete_atom;
+static Atom			wm_protocols_atom;
+
+static void vwm_win_focus(vwm_window_t *vwin);
+static void vwm_keypressed(Window win, XEvent *keypress);
+
+/* animated vwm logo done with simple XOR'd lines, a display of the WM being started and ready */
+typedef struct _vwm_point_t {
+	float	x, y;
+} vwm_point_t;
+
+vwm_point_t	vwm_logo[] = {	{0.0, 0.0},
+				{0.170731, 1.0},
+				{0.341463, 0.0},
+				{0.463414, 1.0},
+				{0.536585, 0.6},
+				{0.609756, 1.0},
+				{0.731707, 0.0},
+				{0.804878, 0.4},
+				{0.878048, 0.0},
+				{1.0, 1.0} };
+
+static void vwm_draw_logo(void)
+{
+	Window		root;
+	int		x, y, i;
+	unsigned int	width, height, border_width, depth, yoff, xoff;
+	XPoint		points[sizeof(vwm_logo) / sizeof(vwm_point_t)];
+
+	XGrabServer(display);
+
+	/* learn the dimensions of the root window */
+	XGetGeometry(display, RootWindow(display, screen_num), &root, &x, &y, &width, &height, &border_width, &depth);
+
+	yoff = ((float)height * .375);
+	xoff = 0;
+	height /= 4;
+
+	/* the logo gets shrunken vertically until it's essentially a flat line */
+	while(height--) {
+		/* scale and center the points to the screen size */
+		for(i = 0; i < sizeof(points) / sizeof(XPoint); i++) {
+			points[i].x = xoff + (vwm_logo[i].x * (float)width);
+			points[i].y = (vwm_logo[i].y * (float)height) + yoff;
+		}
+
+		XDrawLines(display, RootWindow(display, screen_num), gc, points, sizeof(points) / sizeof(XPoint), CoordModeOrigin);
+		XFlush(display);
+		usleep(3333);
+		XDrawLines(display, RootWindow(display, screen_num), gc, points, sizeof(points) / sizeof(XPoint), CoordModeOrigin);
+
+		/* the width is shrunken as well, but only by as much as it is tall */
+		yoff++;
+		width -= 4;
+		xoff += 2;
+	}
+
+	XUngrabServer(display);
+}
+
+
+/* XXX: for now just double forks to avoid having to collect return statuses of the long-running process */
+static void vwm_launch(char **argv)
+{
+	if(!fork()) {
+		if(!fork()) {
+			/* child */
+			execvp(argv[0], argv);
+		}
+		exit(0);
+	}
+	wait(NULL);
+}
+
+
+/* switch to the desired context if it isn't already the focused one, inform caller if anything happened */
+static int vwm_context_focus(vwm_context_focus_t desired_context)
+{
+	vwm_context_focus_t	entry_context = focused_context;
+
+	switch(focused_context) {
+		vwm_window_t		*vwin;
+
+		case VWM_CONTEXT_FOCUS_SHELF:
+			if(desired_context == VWM_CONTEXT_FOCUS_SHELF) break;
+
+			/* desired == DESKTOP && focused == SHELF */
+
+			VWM_TRACE("unmapping shelf window \"%s\"", focused_shelf->name);
+			XUnmapWindow(display, focused_shelf->window);
+			XFlush(display); /* for a more responsive feel */
+
+			/* map the focused desktop */
+			list_for_each_entry(vwin, &windows, windows) {
+				if(vwin->desktop == focused_desktop && !vwin->shelved) {
+					VWM_TRACE("Mapping desktop window \"%s\"", vwin->name);
+					XMapWindow(display, vwin->window);
+				}
+			}
+
+			if(focused_desktop->focused_window) {
+				VWM_TRACE("Focusing \"%s\"", focused_desktop->focused_window->name);
+				XSetInputFocus(display, focused_desktop->focused_window->window, RevertToPointerRoot, CurrentTime);
+			}
+
+			focused_context = VWM_CONTEXT_FOCUS_DESKTOP;
+			break;
+
+		case VWM_CONTEXT_FOCUS_DESKTOP:
+			/* unmap everything, map the shelf */
+			if(desired_context == VWM_CONTEXT_FOCUS_DESKTOP) break;
+
+			/* desired == SHELF && focused == DESKTOP */
+
+			/* there should be a focused shelf if the shelf contains any windows, we NOOP the switch if the shelf is empty. */
+			if(focused_shelf) {
+				/* unmap everything on the current desktop */
+				list_for_each_entry(vwin, &windows, windows) {
+					if(vwin->desktop == focused_desktop) {
+						VWM_TRACE("Unmapping desktop window \"%s\"", vwin->name);
+						XUnmapWindow(display, vwin->window);
+					}
+				}
+
+				XFlush(display); /* for a more responsive feel */
+
+				VWM_TRACE("Mapping shelf window \"%s\"", focused_shelf->name);
+				XMapWindow(display, focused_shelf->window);
+				vwm_win_focus(focused_shelf);
+
+				focused_context = VWM_CONTEXT_FOCUS_SHELF;
+			}
+			break;
+
+		default:
+			VWM_BUG("unexpected focused context %x", focused_context);
+			break;
+	}
+
+	/* return if the context has been changed, the caller may need to branch differently if nothing happened */
+	return (focused_context != entry_context);
+}
+
+
+/* make the specified desktop the most recently used one */
+static void vwm_desktop_mru(vwm_desktop_t *d)
+{
+	list_move(&d->desktops_mru, &desktops_mru);
+}
+
+
+/* focus a virtual desktop */
+/* this switches to the desktop context if necessary, maps and unmaps windows accordingly if necessary */
+static int vwm_desktop_focus(vwm_desktop_t *d)
+{
+	XGrabServer(display);
+	XSync(display, False);
+
+	/* if the context switched and the focused desktop is the desired desktop there's nothing else to do */
+	if( (vwm_context_focus(VWM_CONTEXT_FOCUS_DESKTOP) && focused_desktop != d) || focused_desktop != d) {
+		vwm_window_t	*w;
+
+		/* unmap the windows on the currently focused desktop, map those on the newly focused one */
+		list_for_each_entry(w, &windows, windows) {
+			if(w->shelved) continue;
+
+			if(w->desktop == focused_desktop) {
+				VWM_TRACE("Unmapping \"%s\"", w->name);
+				XUnmapWindow(display, w->window);
+			}
+		}
+
+		XFlush(display);
+
+		list_for_each_entry(w, &windows, windows) {
+			if(w->shelved) continue;
+
+			if(w->desktop == d) {
+				VWM_TRACE("Mapping \"%s\"", w->name);
+				XMapWindow(display, w->window);
+			}
+		}
+
+		focused_desktop = d;
+	}
+
+	/* directly focus the desktop's focused window if there is one, we don't use vwm_win_focus() intentionally XXX */
+	if(focused_desktop->focused_window) {
+		VWM_TRACE("Focusing \"%s\"", focused_desktop->focused_window->name);
+		XSetInputFocus(display, focused_desktop->focused_window->window, RevertToPointerRoot, CurrentTime);
+	}
+
+	XUngrabServer(display);
+
+	return 1;
+}
+
+
+/* create a virtual desktop */
+static vwm_desktop_t * vwm_desktop_create(char *name)
+{
+	vwm_desktop_t	*d;
+
+	d = malloc(sizeof(vwm_desktop_t));
+	if(d == NULL) {
+		VWM_PERROR("Failed to allocate desktop");
+		goto _fail;
+	}
+
+	d->name = name == NULL ? name : strdup(name);
+	d->focused_window = NULL;
+
+	list_add_tail(&d->desktops, &desktops);
+	list_add_tail(&d->desktops_mru, &desktops_mru);
+
+	return d;
+
+_fail:
+	return NULL;
+}
+
+
+/* destroy a virtual desktop */
+static void vwm_desktop_destroy(vwm_desktop_t *d)
+{
+	/* silently refuse to destroy a desktop having windows (for now) */
+	/* there's _always_ a focused window on a desktop having mapped windows */
+	/* also silently refuse to destroy the last desktop (for now) */
+	if(d->focused_window || (d->desktops.next == d->desktops.prev)) return;
+
+	/* focus another desktop if we're the focused desktop */
+	if(d == focused_desktop) {
+		/* we just look for one that is different from ours, relative to ours, looking at the next one then the previous */
+		if(d->desktops.next != &desktops) {
+			vwm_desktop_focus(list_entry(d->desktops.next, vwm_desktop_t, desktops));
+		} else if(d->desktops.prev != &desktops) {
+			vwm_desktop_focus(list_entry(d->desktops.prev, vwm_desktop_t, desktops));
+		}
+	}
+
+	list_del(&d->desktops);
+	list_del(&d->desktops_mru);
+}
+
+
+/* make the specified window the most recently used one */
+static void vwm_win_mru(vwm_window_t *vwin)
+{
+	list_move(&vwin->windows, &windows);
+}
+
+
+/* send a client message to a window (currently used for WM_DELETE) */
+static void vwm_win_message(vwm_window_t *vwin, Atom type, long foo)
+{
+	XEvent	event;
+
+	memset(&event, 0, sizeof(event));
+	event.xclient.type = ClientMessage;
+	event.xclient.window = vwin->window;
+	event.xclient.message_type = type;
+	event.xclient.format = 32;
+	event.xclient.data.l[0] = foo;
+	event.xclient.data.l[1] = CurrentTime;	/* XXX TODO: is CurrentTime actually correct to use for this purpose? */
+
+	XSendEvent(display, vwin->window, False, 0, &event);
+}
+
+
+/* looks up the window in the global window list */
+static vwm_window_t * vwm_win_lookup(Window win)
+{
+	vwm_window_t	*tmp, *vwin = NULL;
+
+	list_for_each_entry(tmp, &windows, windows) {
+		if(tmp->window == win) {
+			vwin = tmp;
+			break;
+		}
+	}
+
+	return vwin;
+}
+
+
+/* helper for returning the currently focused window (considers current context...), may return NULL */
+static vwm_window_t * vwm_win_focused(void)
+{
+	vwm_window_t	*vwin = NULL;
+
+	switch(focused_context) {
+		case VWM_CONTEXT_FOCUS_SHELF:
+			vwin = focused_shelf;
+			break;
+
+		case VWM_CONTEXT_FOCUS_DESKTOP:
+			if(focused_desktop) vwin = focused_desktop->focused_window;
+			break;
+
+		default:
+			VWM_BUG("Unsupported context");
+			break;
+	}
+
+	return vwin;
+}
+
+/* fullscreen a window with borders obscured "allscreen" */
+static void vwm_win_allscreen(vwm_window_t *vwin)
+{
+	Window		root;
+	int		x, y;
+	unsigned int	width, height, border_width, depth;
+
+	if(vwin->fullscreened == 2) return;
+
+	XGetGeometry(display, RootWindow(display, screen_num), &root, &x, &y, &width, &height, &border_width, &depth);
+	XGetGeometry(display, vwin->window, &root, &vwin->client.x, &vwin->client.y, &vwin->client.width, &vwin->client.height, &border_width, &depth);
+	XMoveResizeWindow(display, vwin->window, -border_width, -border_width, width, height);
+	vwin->fullscreened = 2;
+}
+
+/* fullscreen a window */
+static void vwm_win_fullscreen(vwm_window_t *vwin)
+{
+	Window		root;
+	int		x, y;
+	unsigned int	width, height, border_width, depth;
+
+	if(vwin->fullscreened == 1) return;
+
+	XGetGeometry(display, RootWindow(display, screen_num), &root, &x, &y, &width, &height, &border_width, &depth);
+	/* TODO: do not remember the current geometry if we're going from allscreen to fullscreen! */
+	XGetGeometry(display, vwin->window, &root, &vwin->client.x, &vwin->client.y, &vwin->client.width, &vwin->client.height, &border_width, &depth);
+	XMoveResizeWindow(display, vwin->window, 0, 0, width - (border_width * 2), height - (border_width * 2));
+	vwin->fullscreened = 1;
+}
+
+
+/* restore a window to its non-fullscreened size and coordinates */
+static void vwm_win_restore(vwm_window_t *vwin)
+{
+	if(!vwin->fullscreened) return;
+
+	XMoveResizeWindow(display, vwin->window, vwin->client.x, vwin->client.y, vwin->client.width, vwin->client.height);
+	vwin->fullscreened = 0;
+}
+
+
+/* focus a window */
+/* this updates window borders as needed and the X input focus */
+static void vwm_win_focus(vwm_window_t *vwin)
+{
+	VWM_TRACE("focusing: %#x", (unsigned int)vwin->window);
+
+	/* change the focus to the new window */
+	XSetInputFocus(display, vwin->window, RevertToPointerRoot, CurrentTime);
+
+	/* update the border color accordingly */
+	if(vwin->shelved) {
+		/* set the border of the newly focused window to the shelved color */
+		XSetWindowBorder(display, vwin->window, shelved_window_border_color.pixel);
+	} else {
+		if(vwin->desktop == focused_desktop && focused_desktop->focused_window) {
+			/* if we've changed focus within the same desktop, set the currently focused window border to the
+			 * unfocused color.  Otherwise, we want to leave the focused color on the old window on the old desktop */
+			XSetWindowBorder(display, focused_desktop->focused_window->window, unfocused_window_border_color.pixel);
+		}
+
+		/* set the border of the newly focused window to the focused color */
+		XSetWindowBorder(display, vwin->window, focused_window_border_color.pixel);
+
+		/* persist this on a per-desktop basis so it can be restored on desktop switches */
+		focused_desktop->focused_window = vwin;
+	}
+}
+
+
+/* focus the next window on a virtual desktop relative to the supplied window */
+static vwm_window_t * vwm_win_focus_next(vwm_window_t *vwin, vwm_context_focus_t context)
+{
+	vwm_window_t	*next;
+
+	list_for_each_entry(next, &vwin->windows, windows) {
+		/* searching for the next mapped window in this context, using vwin->windows as the head */
+		if(&next->windows == &windows) continue;	/* XXX: skip the containerless head, we're leveraging the circular list implementation */
+
+		if(next->mapped && ((context == VWM_CONTEXT_FOCUS_SHELF && next->shelved) || (context == VWM_CONTEXT_FOCUS_DESKTOP && !next->shelved && next->desktop == focused_desktop))) break;
+	}
+
+	switch(context) {
+		case VWM_CONTEXT_FOCUS_DESKTOP:
+			if(next != next->desktop->focused_window) {
+				/* focus the changed window */
+				vwm_win_focus(next);
+				XRaiseWindow(display, next->window);
+			}
+			break;
+
+		case VWM_CONTEXT_FOCUS_SHELF:
+			if(next != focused_shelf) {
+				/* shelf switch, unmap the focused shelf and take it over */
+				VWM_TRACE("Unmapping window \"%s\"", focused_shelf->name);
+				XUnmapWindow(display, focused_shelf->window);
+
+				XFlush(display);
+
+				VWM_TRACE("Mapping window \"%s\"", next->name);
+				XMapWindow(display, next->window);
+				focused_shelf = next;
+				vwm_win_focus(next);
+			}
+			break;
+
+		default:
+			VWM_ERROR("Unhandled focus context %#x", context);
+			break;
+	}
+
+	VWM_TRACE("\"%s\"", next->name);
+
+	return next;
+}
+
+
+/* shelves a window, if the window is focused we focus the next one (if possible) */
+static void vwm_win_shelve(vwm_window_t *vwin)
+{
+	/* already shelved, NOOP */
+	if(vwin->shelved) return;
+
+	/* shelving focused window, focus the next window */
+	if(vwin == vwin->desktop->focused_window) {
+		vwm_win_mru(vwm_win_focus_next(vwin, VWM_CONTEXT_FOCUS_DESKTOP));
+	}
+
+	if(vwin == vwin->desktop->focused_window) {
+		/* TODO: we can probably put this into vwm_win_focus_next() and have it always handled there... */
+		vwin->desktop->focused_window = NULL;
+	}
+
+	vwin->shelved = 1;
+	vwm_win_mru(vwin);
+
+	/* newly shelved windows always become the focused shelf */
+	focused_shelf = vwin;
+
+	VWM_TRACE("Unmapping \"%s\"", vwin->name);
+	XUnmapWindow(display, vwin->window);
+}
+
+
+typedef enum _vwm_grab_mode_t {
+	VWM_NOT_GRABBED = 0,
+	VWM_GRABBED
+} vwm_grab_mode_t;
+
+/* manages a new window (called in response to CreateNotify events, and during startup to manage existing windows) */
+static vwm_window_t * vwm_win_manage(Window win, vwm_grab_mode_t grabbed)
+{
+	XWindowAttributes	attrs;
+	vwm_window_t		*vwin, *focused;
+
+	/* prevent races */
+	if(!grabbed) {
+		XGrabServer(display);
+		XSync(display, False);
+	}
+
+	/* verify the window still exists */
+	if(!XGetWindowAttributes(display, win, &attrs)) goto _fail_grabbed;
+
+	/* honor overrides, don't manage InputOnly windows */
+	if(attrs.override_redirect || attrs.class == InputOnly) goto _fail_grabbed;
+
+	VWM_TRACE("Managing %#x", (unsigned int)win);
+
+	/* if no desktops exist, implicitly create one */
+	if(!focused_desktop) {
+		/* TODO: interactively name desktops */
+		vwm_desktop_focus(vwm_desktop_create(NULL));
+		vwm_desktop_mru(focused_desktop);
+	}
+
+	/* allocate and initialize our per-managed-window structure and get it on the global windows list */
+	vwin = (vwm_window_t *)malloc(sizeof(vwm_window_t));
+	if(vwin == NULL) {
+		VWM_PERROR("Failed to allocate vwin");
+		goto _fail_grabbed;
+	}
+
+        XUngrabButton(display, AnyButton, AnyModifier, win);
+	XGrabButton(display, AnyButton, Mod1Mask, win, False, (PointerMotionMask | ButtonPressMask | ButtonReleaseMask), GrabModeAsync, GrabModeAsync, None, None);
+	XGrabKey(display, AnyKey, Mod1Mask, win, False, GrabModeAsync, GrabModeAsync);
+	XSetWindowBorder(display, win, unfocused_window_border_color.pixel);
+
+	vwin->name = NULL;
+	XFetchName(display, win, &vwin->name);
+
+	vwin->hints = XAllocSizeHints();
+	if(!vwin->hints) {
+		VWM_PERROR("Failed to allocate WM hints");
+		goto _fail_grabbed;
+	}
+	XGetWMNormalHints(display, win, vwin->hints, &vwin->hints_supplied);
+
+	vwin->desktop = focused_desktop;
+	vwin->window = win;
+	vwin->fullscreened = 0;
+	vwin->shelved = (focused_context == VWM_CONTEXT_FOCUS_SHELF);	/* if we're in the shelf when the window is created, the window is shelved */
+	vwin->mapped = (attrs.map_state != IsUnmapped);
+
+	/* remember whatever the current attributes are */
+	vwin->client.x = attrs.x;
+	vwin->client.y = attrs.y;
+	vwin->client.width = attrs.width;
+	vwin->client.height = attrs.height;
+
+	VWM_TRACE("hints: flags=%lx x=%i y=%i w=%i h=%i minw=%i minh=%i maxw=%i maxh=%i winc=%i hinc=%i basew=%i baseh=%i grav=%x",
+			vwin->hints->flags,
+			vwin->hints->x, vwin->hints->y,
+			vwin->hints->width, vwin->hints->height,
+			vwin->hints->min_width, vwin->hints->min_height,
+			vwin->hints->max_width, vwin->hints->max_height,
+			vwin->hints->width_inc, vwin->hints->height_inc,
+			vwin->hints->base_width, vwin->hints->base_height,
+			vwin->hints->win_gravity);
+
+	if((vwin->hints_supplied & (USSize | PSize))) {
+		vwin->client.width = vwin->hints->base_width;
+		vwin->client.height = vwin->hints->base_height;
+	}
+
+	/* put it on the global windows list, if there's a focused window insert the new one after it */
+	if(!list_empty(&windows) && (focused = vwm_win_focused())) {
+		/* insert the vwin immediately after the focused window, so Mod1+Tab goes to the new window */
+		list_add(&vwin->windows, &focused->windows);
+	} else {
+		list_add(&vwin->windows, &windows);
+	}
+
+	/* if the desktop has no focused window yet, automatically focus the newly managed one */
+	/* TODO: how does this interact with the shelf? */
+	if(!focused_desktop->focused_window) {
+		VWM_TRACE("Mapped window \"%s\" is alone on desktop \"%s\", focusing", vwin->name, focused_desktop->name);
+		vwm_win_focus(vwin);
+	}
+
+	if(!grabbed) XUngrabServer(display);
+
+	return vwin;
+
+_fail_grabbed:
+	if(!grabbed) XUngrabServer(display);
+
+	return NULL;
+}
+
+
+/* helper for (idempotently) unfocusing a window, deals with context switching etc... */
+static void vwm_win_unfocus(vwm_window_t *vwin)
+{
+	/* if we're the shelved window, cycle the focus to the next shelved window if possible, if there's no more shelf, switch to the desktop */
+	/* TODO: what if it's not mapped but goes away???  we don't want to try take the InputFocus it when not mapped... XXX TODO */
+	if(vwin == focused_shelf) {
+		VWM_TRACE("unfocusing focused shelf");
+		vwm_win_focus_next(vwin, VWM_CONTEXT_FOCUS_SHELF);
+
+		if(vwin == focused_shelf) {
+			VWM_TRACE("shelf empty, leaving");
+			/* no other shelved windows, exit the shelf context */
+			vwm_context_focus(VWM_CONTEXT_FOCUS_DESKTOP);
+			focused_shelf = NULL;
+		}
+	}
+
+	/* if we're the focused window cycle the focus to the next window on the desktop if possible */
+	if(vwin->desktop->focused_window == vwin) {
+		VWM_TRACE("unfocusing focused window");
+		vwm_win_focus_next(vwin, VWM_CONTEXT_FOCUS_DESKTOP);
+	}
+
+	if(vwin->desktop->focused_window == vwin) {
+		VWM_TRACE("desktop empty");
+		vwin->desktop->focused_window = NULL;
+	}
+}
+
+
+/* migrate a window to a new desktop, focuses the destionation desktop as well */
+static void vwm_win_migrate(vwm_window_t *vwin, vwm_desktop_t *desktop)
+{
+	/* go through the motions of unfocusing the window if it is focused */
+	vwm_win_unfocus(vwin);
+
+	/* ensure not shelved */
+	vwin->shelved = 0;
+
+	/* assign the new desktop */
+	vwin->desktop = desktop;
+
+	/* currently we always focus the new desktop in a migrate */
+	vwm_desktop_focus(desktop);
+
+	/* focus the window so borders get updated */
+	vwm_win_focus(vwin);
+	vwm_win_mru(vwin);
+
+	/* ensure the window is raised */
+	XRaiseWindow(display, vwin->window);
+}
+
+
+/* unmanages a managed window (called in response to DestroyNotify) */
+static void vwm_win_unmanage(Window win)
+{
+	vwm_window_t		*vwin;
+
+	VWM_TRACE("unmanaging %x", (unsigned int)win);
+
+	XGrabServer(display);
+	XSync(display, False);
+
+	/* find the window */
+	vwin = vwm_win_lookup(win);
+
+	if(!vwin) {
+		VWM_TRACE("window %x not managed", (unsigned int)win);
+		goto _ungrab;
+	}
+
+	/* unfocus the window */
+	vwm_win_unfocus(vwin);
+
+	/* remove the window from the global windows list */
+	list_del(&vwin->windows);
+
+	if(vwin->name) XFree(vwin->name);
+
+	free(vwin);
+
+_ungrab:
+	XUngrabServer(display);
+}
+
+
+/* manage all existing windows (for startup) */
+static int vwm_manage_existing(void)
+{
+	Window		root, parent;
+	Window		*children = NULL;
+	unsigned int	n_children, i;
+	vwm_window_t	*vwin;
+
+	XGrabServer(display);
+	XSync(display, False);
+	XQueryTree(display, RootWindow(display, screen_num), &root, &parent, &children, &n_children);
+
+	for(i = 0; i < n_children; i++) {
+		if (children[i] == None) continue;
+
+		if((vwin = vwm_win_manage(children[i], VWM_GRABBED)) == NULL) goto _fail_grabbed;
+	}
+
+	XUngrabServer(display);
+
+	if(children) XFree(children);
+
+	return 1;
+
+_fail_grabbed:
+	XUngrabServer(display);
+
+	if(children) XFree(children);
+
+	return 0;
+}
+
+
+/* helper function for resizing a window, how the motion is applied depends on where in the window the impetus event occurred */
+static void compute_resize(vwm_window_t *vwin, XWindowAttributes *attrs, XEvent *impetus, XEvent *terminus, XWindowAttributes *new)
+{
+	int	dw = (attrs->width / 2);
+	int	dh = (attrs->height / 2);
+	int	xdelta = (terminus->xbutton.x_root - impetus->xbutton.x_root);
+	int	ydelta = (terminus->xbutton.y_root - impetus->xbutton.y_root);
+	int	min_width = 0, min_height = 0;
+	int	width_inc = 1, height_inc = 1;
+
+	/* TODO: there's probably a problem here WRT border width, I probably should be considering it. */
+
+	if(vwin && vwin->hints) {
+		if((vwin->hints_supplied & PMinSize)) {
+			min_width = vwin->hints->min_width;
+			min_height = vwin->hints->min_height;
+			VWM_TRACE("window size hints exist and minimum sizes are w=%i h=%i", min_width, min_height);
+		}
+
+		if((vwin->hints_supplied & PResizeInc)) {
+			width_inc = vwin->hints->width_inc;
+			height_inc = vwin->hints->height_inc;
+			VWM_TRACE("window size hints exist and resize increments are w=%i h=%i", width_inc, height_inc);
+			if(!width_inc) width_inc = 1;
+			if(!height_inc) height_inc = 1;
+		}
+	}
+
+	xdelta = xdelta / width_inc * width_inc;
+	ydelta = ydelta / height_inc * height_inc;
+
+	if(impetus->xbutton.x < dw && impetus->xbutton.y < dh) {
+		/* grabbed top left */
+		new->x = attrs->x + xdelta;
+		new->y = attrs->y + ydelta;
+		new->width = attrs->width - xdelta;
+		new->height = attrs->height - ydelta;
+	} else if(impetus->xbutton.x > dw && impetus->xbutton.y < dh) {
+		/* grabbed top right */
+		new->x = attrs->x;
+		new->y = attrs->y + ydelta;
+		new->width = attrs->width + xdelta;
+		new->height = attrs->height - ydelta;
+	} else if(impetus->xbutton.x < dw && impetus->xbutton.y > dh) {
+		/* grabbed bottom left */
+		new->x = attrs->x + xdelta;
+		new->y = attrs->y;
+		new->width = attrs->width - xdelta;
+		new->height = attrs->height + ydelta;
+	} else if(impetus->xbutton.x > dw && impetus->xbutton.y > dh) {
+		/* grabbed bottom right */
+		new->x = attrs->x;
+		new->y = attrs->y;
+		new->width = attrs->width + xdelta;
+		new->height = attrs->height + ydelta;
+	}
+
+	/* constrain the width and height of the window according to the minimums */
+	if(new->width < min_width) {
+		if(attrs->x != new->x) {
+			new->x -= (min_width - new->width);
+		}
+
+		new->width = min_width;
+	}
+
+	if(new->height < min_height) {
+		if(attrs->y != new->y) {
+			new->y -= (min_height - new->height);
+		}
+
+		new->height = min_height;
+	}
+}
+
+
+typedef enum _vwm_adjust_mode_t {
+	VWM_ADJUST_RESIZE,
+	VWM_ADJUST_MOVE
+} vwm_adjust_mode_t;
+
+/* XXX: impetus is currently assumed to be an xbutton event */
+static int vwm_clicked(Window win, XEvent *impetus)
+{
+	XWindowAttributes	orig, lastrect;
+	vwm_window_t		*vwin;
+
+	/* verify the window still exists */
+	if(!XGetWindowAttributes(display, win, &orig)) goto _fail;
+
+	if(!(vwin = vwm_win_lookup(win))) goto _fail;
+
+	if(impetus->xbutton.state & Mod1Mask) {
+		int			finished = 0;
+		vwm_adjust_mode_t	mode;
+
+		switch(impetus->xbutton.button) {
+			case Button1:
+				/* immediately raise the window if we're relocating,
+				 * resizes are supported without raising (which also enables NULL resizes to focus without raising) */
+				mode = VWM_ADJUST_MOVE;
+				XRaiseWindow(display, win);
+				break;
+
+			case Button3:
+				/* grab the server on resize for the xor rubber-banding's sake */
+				XGrabServer(display);
+				XSync(display, False);
+
+				XDrawRectangle(display, RootWindow(display, screen_num), gc, orig.x, orig.y, orig.width, orig.height);
+				lastrect = orig;
+
+				mode = VWM_ADJUST_RESIZE;
+				break;
+
+			default:
+				goto _fail;
+		}
+
+		/* apply Motion events until the button is released, move vs. move+resize is performed depending on the supplied mode */
+		while(!finished) {
+			XEvent			event;
+			XWindowAttributes	resized;
+
+			XNextEvent(display, &event);
+			switch(event.type) {
+				case ButtonRelease:
+					switch(mode) {
+						case VWM_ADJUST_MOVE:
+							XMoveWindow(display, win,
+									orig.x + (event.xbutton.x_root - impetus->xbutton.x_root),
+									orig.y + (event.xbutton.y_root - impetus->xbutton.y_root));
+							break;
+
+						case VWM_ADJUST_RESIZE:
+							compute_resize(vwin, &orig, impetus, &event, &resized);
+							/* move and resize the window @ resized */
+							XDrawRectangle(display, RootWindow(display, screen_num), gc, lastrect.x, lastrect.y, lastrect.width, lastrect.height);
+							XMoveResizeWindow(display, win, resized.x, resized.y, resized.width, resized.height);
+							XUngrabServer(display);
+
+							break;
+
+						default:
+							break;
+					}
+					/* once you manipulate the window it's no longer fullscreened, simply hitting Mod1+Return once will restore fullscreened mode */
+					vwin->fullscreened = 0;
+					finished = 1;
+					break;
+
+				case MotionNotify:
+					switch(mode) {
+						case VWM_ADJUST_MOVE:
+							XMoveWindow(display, win,
+									orig.x + (event.xmotion.x_root - impetus->xbutton.x_root),
+									orig.y + (event.xmotion.y_root - impetus->xbutton.y_root));
+							break;
+
+						case VWM_ADJUST_RESIZE:
+							/* XXX: it just so happens the XMotionEvent structure is identical to XButtonEvent in the fields
+							 * needed by compute_resize... */
+							compute_resize(vwin, &orig, impetus, &event, &resized);
+							/* erase the last rectangle */
+							XDrawRectangle(display, RootWindow(display, screen_num), gc, lastrect.x, lastrect.y, lastrect.width, lastrect.height);
+							/* draw a frame @ resized coordinates */
+							XDrawRectangle(display, RootWindow(display, screen_num), gc, resized.x, resized.y, resized.width, resized.height);
+							/* remember the last rectangle */
+							lastrect = resized;
+							break;
+
+						default:
+							break;
+					}
+					break;
+
+				default:
+					VWM_ERROR("unexpected event during window adjust %i", event.type);
+					break;
+			}
+		}
+	}
+
+	/* always set the input focus to the clicked window, note if we allow this to happen on the root window, it enters sloppy focus mode
+	 * until a non-root window is clicked, which is an interesting hybrid but not how I prefer it. */
+	if(vwin != focused_desktop->focused_window && vwin->window != RootWindow(display, screen_num)) {
+		vwm_win_focus(vwin);
+		vwm_win_mru(vwin);
+	}
+
+	XFlush(display);
+	XUngrabPointer(display, CurrentTime);
+
+	return 1;
+
+_fail:
+	XUngrabPointer(display, CurrentTime);
+
+	return 0;
+}
+
+
+/* Called in response to KeyRelease events, for now only interesting for detecting when Mod1 is released termintaing
+ * window cycling for application of MRU on the focused window */
+static void vwm_keyreleased(Window win, XEvent *keyrelease)
+{
+	vwm_window_t	*vwin;
+	KeySym		sym;
+
+	switch((sym = XLookupKeysym(&keyrelease->xkey, 0))) {
+		case XK_Alt_R:
+		case XK_Alt_L:	/* TODO: actually use the modifier mapping, for me XK_Alt_[LR] is Mod1.  XGetModifierMapping()... */
+			VWM_TRACE("XK_Alt_[LR] released");
+			/* make the focused window the most recently used */
+			if((vwin = vwm_win_focused())) {
+				vwm_win_mru(vwin);
+			}
+
+			/* make the focused desktop the most recently used */
+			if(focused_context == VWM_CONTEXT_FOCUS_DESKTOP && focused_desktop) {
+				vwm_desktop_mru(focused_desktop);
+			}
+
+			if(key_is_grabbed) {
+				XUngrabKeyboard(display, CurrentTime);
+				XFlush(display);
+				key_is_grabbed = 0;
+			}
+			break;
+
+		default:
+			VWM_TRACE("Unhandled keycode: %x", (unsigned int)sym);
+			break;
+	}
+}
+
+
+/* Called in response to KeyPress events, I currenly only grab Mod1 keypress events */
+static void vwm_keypressed(Window win, XEvent *keypress)
+{
+	vwm_window_t	*vwin;
+	KeySym		sym;
+	static KeySym	last_sym;
+	static int	repeat_cnt = 0;
+	int		do_grab = 0;
+
+	sym = XLookupKeysym(&keypress->xkey, 0);
+
+	/* detect repeaters, note repeaters do not span interrupted Mod1 sequences! */
+	if(key_is_grabbed && sym == last_sym) {
+		repeat_cnt++;
+	} else {
+		repeat_cnt = 0;
+	}
+
+	switch(sym) {
+
+#define launcher(_sym, _argv...)\
+		case _sym:	\
+			{	\
+			char	*args[] = {_argv, NULL};\
+			vwm_launch(args);\
+			break;	\
+		}
+#include "launchers.def"
+#undef launcher
+
+		case XK_grave: /* toggle shelf visibility */
+			vwm_context_focus(VWM_CONTEXT_FOCUS_OTHER);
+			break;
+
+		case XK_Tab: /* cycle focused window */
+			do_grab = 1; /* grab the keyboard so we can respond to the Mod1 release */
+
+			/* focus the next window, note this doesn't affect MRU, that happens on Mod1 release */
+			if((vwin = vwm_win_focused())) {
+				vwm_win_focus_next(vwin, focused_context);
+			}
+			break;
+
+		case XK_space: /* cycle focused desktop utilizing MRU */
+			do_grab = 1; /* grab the keyboard so we can respond to the Mod1 release for MRU updating */
+
+			/* XXX: note the sensitivity to the desktops_mru head here, we want to look past it. */
+			vwm_desktop_focus(list_entry(focused_desktop->desktops_mru.next == &desktops_mru ? focused_desktop->desktops_mru.next->next : focused_desktop->desktops_mru.next, vwm_desktop_t, desktops_mru));
+			break;
+
+		case XK_d: /* destroy focused */
+			if((vwin = vwm_win_focused())) {
+				if(keypress->xkey.state & ShiftMask) {  /* brutally destroy the focused window */
+					XKillClient(display, vwin->window);
+				} else { /* kindly destroy the focused window */
+					vwm_win_message(vwin, wm_protocols_atom, wm_delete_atom);
+				}
+			} else if(focused_context == VWM_CONTEXT_FOCUS_DESKTOP) {
+				/* destroy the focused desktop when destroy occurs without any windows */
+				vwm_desktop_destroy(focused_desktop);
+			}
+			break;
+
+		case XK_Escape: /* leave VWM rudely */
+			exit(42);
+
+		case XK_v: /* instantiate (and focus) a new (potentially empty, unless migrating) virtual desktop */
+			if(keypress->xkey.state & ShiftMask) {
+				if((vwin = vwm_win_focused())) {
+					/* migrate the focused window to a newly created virtual desktop, focusing the new desktop simultaneously */
+					vwm_win_migrate(vwin, vwm_desktop_create(NULL));
+				}
+			} else {
+				vwm_desktop_focus(vwm_desktop_create(NULL));
+				vwm_desktop_mru(focused_desktop);
+			}
+			break;
+
+		case XK_h: /* previous virtual desktop, if we're in the shelf context this will simply switch to desktop context */
+			do_grab = 1; /* grab the keyboard so we can respond to the Mod1 release for MRU updating */
+
+			if(keypress->xkey.state & ShiftMask) {
+				if((vwin = vwm_win_focused()) && vwin->desktop->desktops.prev != &desktops) {
+					/* migrate the focused window with the desktop focus to the previous desktop */
+					vwm_win_migrate(vwin, list_entry(vwin->desktop->desktops.prev, vwm_desktop_t, desktops));
+				}
+			} else {
+				if(focused_context == VWM_CONTEXT_FOCUS_SHELF) {
+					/* focus the focused desktop instead of the shelf */
+					vwm_context_focus(VWM_CONTEXT_FOCUS_DESKTOP);
+				} else if(focused_desktop->desktops.prev != &desktops) {
+					/* focus the previous desktop */
+					vwm_desktop_focus(list_entry(focused_desktop->desktops.prev, vwm_desktop_t, desktops));
+				}
+			}
+			break;
+
+		case XK_l: /* next virtual desktop, if we're in the shelf context this will simply switch to desktop context */
+			do_grab = 1; /* grab the keyboard so we can respond to the Mod1 release for MRU updating */
+
+			if(keypress->xkey.state & ShiftMask) {
+				if((vwin = vwm_win_focused()) && vwin->desktop->desktops.next != &desktops) {
+					/* migrate the focused window with the desktop focus to the next desktop */
+					vwm_win_migrate(vwin, list_entry(vwin->desktop->desktops.next, vwm_desktop_t, desktops));
+				}
+			} else {
+				if(focused_context == VWM_CONTEXT_FOCUS_SHELF) {
+					/* focus the focused desktop instead of the shelf */
+					vwm_context_focus(VWM_CONTEXT_FOCUS_DESKTOP);
+				} else if(focused_desktop->desktops.next != &desktops) {
+					/* focus the next desktop */
+					vwm_desktop_focus(list_entry(focused_desktop->desktops.next, vwm_desktop_t, desktops));
+				}
+			}
+			break;
+
+		case XK_k: /* raise or shelve the focused window */
+			if((vwin = vwm_win_focused())) {
+				if(keypress->xkey.state & ShiftMask) { /* shelf the window and focus the shelf */
+					if(focused_context != VWM_CONTEXT_FOCUS_SHELF) {
+						/* shelve the focused window while focusing the shelf */
+						vwm_win_shelve(vwin);
+						vwm_context_focus(VWM_CONTEXT_FOCUS_SHELF);
+					}
+				} else {
+					do_grab = 1;
+
+					XRaiseWindow(display, vwin->window);
+
+					if(repeat_cnt == 1) {
+						/* double: reraise & fullscreen */
+						vwm_win_fullscreen(vwin);
+					} else if(repeat_cnt == 2) {
+						 /* triple: reraise & fullscreen w/borders obscured by screen perimiter */
+						vwm_win_allscreen(vwin);
+					}
+					XFlush(display);
+				}
+			}
+			break;
+
+		case XK_j: /* lower or unshelve the focused window */
+			if((vwin = vwm_win_focused())) {
+				if(keypress->xkey.state & ShiftMask) { /* unshelf the window to the focused desktop, and focus the desktop */
+					if(focused_context == VWM_CONTEXT_FOCUS_SHELF) {
+						/* unshelve the focused window, focus the desktop it went to */
+						vwm_win_migrate(vwin, focused_desktop);
+					}
+				} else {
+					if(vwin->fullscreened == 2) {
+						vwm_win_fullscreen(vwin);
+					} else {
+						XLowerWindow(display, vwin->window);
+					}
+					XFlush(display);
+				}
+			}
+			break;
+
+		case XK_Return: /* (full-screen / restore) focused window */
+			if((vwin = vwm_win_focused())) {
+				if(vwin->fullscreened) {
+					vwm_win_restore(vwin);
+				} else {
+					vwm_win_fullscreen(vwin);
+				}
+			}
+			break;
+
+		case XK_s: /* shelve focused window */
+			if((vwin = vwm_win_focused()) && !vwin->shelved) {
+				vwm_win_shelve(vwin);
+			}
+			break;
+
+		default:
+			VWM_TRACE("Unhandled keycode: %x", (unsigned int)sym);
+			break;
+	}
+
+	/* if what we're doing requests a grab if not already grabbed, grab keyboard */
+	if(!key_is_grabbed && do_grab) {
+		XGrabKeyboard(display, RootWindow(display, screen_num), False, GrabModeAsync, GrabModeAsync, CurrentTime);
+		key_is_grabbed = 1;
+	}
+
+	/* remember the symbol for repeater detection */
+	last_sym = sym;
+}
+
+
+static int errhandler(Display *display, XErrorEvent *err)
+{
+	/* TODO */
+	return 1;
+}
+ 
+int main(int argc, char *argv[])
+{
+	int			done = 0;
+	XEvent			event;
+	Cursor			pointer;
+
+	/* open connection with the server */
+	if((display = XOpenDisplay(NULL)) == NULL) {
+		VWM_ERROR("Cannot open display");
+		return 1;
+	}
+
+	/* prevent children from inheriting the X connection */
+	if(fcntl(ConnectionNumber(display), F_SETFD, FD_CLOEXEC) < 0) {
+		VWM_ERROR("Cannot set FD_CLOEXEC on X connection");
+		return 2;
+	}
+
+	XSetErrorHandler(errhandler);
+
+	screen_num = DefaultScreen(display);
+
+	/* allocate colors, I make assumptions about the X server's color capabilities since I'll only use this on modern-ish computers... */
+	cmap = DefaultColormap(display, screen_num);
+
+#define color(_sym, _str) \
+	XAllocNamedColor(display, cmap, _str, &_sym ## _color, &_sym ## _color);
+#include "colors.def"
+#undef color
+
+	wm_delete_atom = XInternAtom(display, "WM_DELETE_WINDOW", False);
+	wm_protocols_atom = XInternAtom(display, "WM_PROTOCOLS", False);
+
+	XSelectInput(display, RootWindow(display, screen_num), SubstructureNotifyMask | SubstructureRedirectMask | PointerMotionMask | ButtonPressMask | ButtonReleaseMask);
+	XGrabKey(display, AnyKey, Mod1Mask, RootWindow(display, screen_num), False, GrabModeAsync, GrabModeAsync);
+
+	XFlush(display);
+
+	XSetInputFocus(display, RootWindow(display, screen_num), RevertToPointerRoot, CurrentTime);
+
+	/* manage all preexisting windows */
+	vwm_manage_existing();
+
+	/* create GC for logo drawing and window rubber-banding */
+	gc = XCreateGC(display, RootWindow(display, screen_num), 0, NULL);
+	XSetSubwindowMode(display, gc, IncludeInferiors);
+	XSetFunction(display, gc, GXxor);
+
+	/* first the logo color is the foreground */
+	XSetForeground(display, gc, logo_color.pixel);
+	vwm_draw_logo();
+
+	/* change to the rubber-banding foreground color */
+	XSetForeground(display, gc, rubberband_color.pixel);
+
+	XClearWindow(display, RootWindow(display, screen_num));
+
+	/* set the pointer */
+	pointer = XCreateFontCursor(display, XC_X_cursor);
+	XDefineCursor(display, RootWindow(display, screen_num), pointer);
+
+	/* event loop */
+	while (!done) {
+		XNextEvent(display, &event);
+		switch (event.type) {
+			case Expose:
+				VWM_TRACE("expose");
+				break;
+
+			case KeyPress:
+				VWM_TRACE("keypress");
+				vwm_keypressed(event.xkey.window, &event);
+				break;
+
+			case KeyRelease:
+				VWM_TRACE("keyrelease");
+				vwm_keyreleased(event.xkey.window, &event);
+				break;
+
+			case ButtonPress:
+				VWM_TRACE("buttonpresss");
+				vwm_clicked(event.xbutton.window, &event);
+				break;
+
+			case ButtonRelease:
+				VWM_TRACE("buttonrelease");
+				break;
+
+			case DestroyNotify:
+				VWM_TRACE("destroynotify");
+				vwm_win_unmanage(event.xdestroywindow.window);
+				break;
+
+			case CirculateNotify:
+				VWM_TRACE("circulatenotify");
+				break;
+
+			case ConfigureNotify:
+				VWM_TRACE("configurenotify");
+				break;
+
+			case UnmapNotify:
+				VWM_TRACE("unmapnotify");
+				break;
+
+			case CreateNotify:
+				VWM_TRACE("createnotify");
+				vwm_win_manage(event.xcreatewindow.window, VWM_NOT_GRABBED);
+				break;
+
+			case GravityNotify:
+				VWM_TRACE("gravitynotify");
+				break;
+
+			case MapNotify:
+				VWM_TRACE("mapnotify");
+				break;
+
+			case ReparentNotify:
+				VWM_TRACE("reparentnotify");
+				break;
+
+			case MotionNotify:
+				VWM_TRACE("motionnotify");
+				break;
+
+			case ConfigureRequest: {
+				XWindowChanges	changes = {
+							.x = event.xconfigurerequest.x,		/* TODO: for now I don't manipulate anything */
+							.y = event.xconfigurerequest.y,
+							.width = event.xconfigurerequest.width,
+							.height = event.xconfigurerequest.height,
+							.border_width = WINDOW_BORDER_WIDTH /* except I do override whatever the border width may be */
+						};
+
+				VWM_TRACE("configurerequest x=%i y=%i w=%i h=%i", changes.x, changes.y, changes.width, changes.height);
+				XConfigureWindow(display, event.xconfigurerequest.window, (event.xconfigurerequest.value_mask | CWBorderWidth), &changes);
+				break;
+			}
+
+			case MapRequest: {
+				vwm_window_t	*vwin;
+
+				VWM_TRACE("maprequest");
+
+				vwin = vwm_win_lookup(event.xmap.window);
+				if(vwin && !vwin->mapped) {
+					int			x = 0, y = 0;
+					XWindowAttributes	attrs;
+					XWindowChanges		changes;
+
+					/* on initial mapping of a window we discover the coordinates and dimensions of the window */
+					changes.x = x;
+					changes.y = y;
+
+					vwin->mapped = 1;
+					XGetWMNormalHints(display, event.xmap.window, vwin->hints, &vwin->hints_supplied);
+					XGetWindowAttributes(display, event.xmap.window, &attrs);
+
+					/* TODO: this is a good place to hook in a window placement algo */
+					vwin->client.x = x;
+					vwin->client.y = y;
+
+					vwin->client.height = attrs.height;
+					vwin->client.width = attrs.width;
+
+					XConfigureWindow(display, event.xmap.window, (CWX | CWY), &changes);
+				}
+				
+				XMapWindow(display, event.xmap.window);
+				if(vwin->desktop->focused_window == vwin) {
+					XSync(display, False);
+					XSetInputFocus(display, vwin->window, RevertToPointerRoot, CurrentTime);
+				}
+				break;
+			}
+
+			case MappingNotify:
+				VWM_TRACE("mapping notify");
+				XRefreshKeyboardMapping(&event.xmapping);
+				break;
+
+			default:
+				VWM_ERROR("Unhandled X op %i", event.type);
+				break;
+		}
+	}
+
+	/* close connection to server */
+	XFlush(display);
+	XCloseDisplay(display);
+ 
+	return 0;
+}
diff --git a/vwm.h b/vwm.h
new file mode 100644
index 0000000..57c2c3b
--- /dev/null
+++ b/vwm.h
@@ -0,0 +1,50 @@
+#ifndef _VWM_H
+#define _VWM_H
+
+#include <stdio.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <errno.h>
+
+#include "list.h"
+
+#define VWM_ERROR(fmt, args...)   fprintf(stderr, "%s:%i\t%s() "fmt"\n", __FILE__, __LINE__, __FUNCTION__, ##args)
+#define VWM_PERROR(fmt, args...)   fprintf(stderr, "%s:%i\t%s() "fmt"; %s\n", __FILE__, __LINE__, __FUNCTION__, ##args, strerror(errno))
+#define VWM_BUG(fmt, args...)   fprintf(stderr, "BUG %s:%i\t%s() "fmt"; %s\n", __FILE__, __LINE__, __FUNCTION__, ##args, strerror(errno))
+
+#ifdef TRACE
+#define VWM_TRACE(fmt, args...)   fprintf(stderr, "%s:%i\t%s() "fmt"\n", __FILE__, __LINE__, __FUNCTION__, ##args)
+#else
+#define VWM_TRACE(fmt, args...)
+#endif
+
+typedef struct _vwm_box_t {
+	int		x, y;
+	unsigned int	width, height;
+} vwm_box_t;
+
+typedef struct _vwm_desktop_t {
+	list_head_t		desktops;			/* global list of (virtual) desktops */
+	list_head_t		desktops_mru;			/* global list of (virtual) desktops in MRU order */
+	char			*name;				/* name of the desktop (TODO) */
+	struct _vwm_window_t	*focused_window;		/* the focused window on this virtual desktop */
+} vwm_desktop_t;
+
+typedef struct _vwm_window_t {
+	list_head_t		windows;		/* global list of managed client windows */
+	struct _vwm_desktop_t	*desktop;		/* desktop this window belongs to currently */
+	char			*name;			/* client name */
+
+	vwm_box_t		client;			/* box of the configured client window relative to the root */
+
+	Window			window;			/* the X window being managed by vwm */
+
+	XSizeHints		*hints;			/* hints the client supplied */
+	long			hints_supplied;		/* bitfield reflecting the hints the client supplied */
+
+	unsigned int		fullscreened:2;		/* is the window fullscreened (1)?  is the window "allscreened" with the border obscured (2)? */
+	unsigned int		mapped:1;		/* has mapping been requested on the window? */
+	unsigned int		shelved:1;		/* is the window shelved? */
+} vwm_window_t;
+
+#endif