🎨 Improved code structure

Minor improvements to remove useless procedures, improve the readability
of the code, and soft preparation to properly handle ICCCM and EWMH
Hints.

src/aswm/aswm.c

@@ -7,24 +7,67 @@
 #include "event_handlers/unmap.h"
 #include "event_handlers/reparent.h"
 #include "event_handlers/destroy.h"
-#include "log/log.h"
+#include "log/error.h"
 
 Aswm _aswm;
 
+
 void aswm_open() {
 	_aswm.display = XOpenDisplay(NULL);
-	Window root_window = DefaultRootWindow(_aswm.display);
+	_aswm.workspaces = malloc(0);
+	_aswm.workspace_count = 0;
 
-	printf("PointerRoot %lu\n", PointerRoot);
-	printf("None %lu\n", None);
-	printf("Root window %lu\n", root_window);
+	XSetErrorHandler(aswm_error_handler);
 
-	XSelectInput(_aswm.display, root_window, SubstructureRedirectMask | SubstructureNotifyMask | FocusChangeMask | EnterWindowMask | LeaveWindowMask | ButtonPressMask | ButtonReleaseMask);
+	Window x_root_window = DefaultRootWindow(_aswm.display);
+	XWindowAttributes x_root_attributes;
+	XGetWindowAttributes(_aswm.display, x_root_window, &x_root_attributes);
+
+	_aswm.root_window = XCreateSimpleWindow(
+			_aswm.display, x_root_window,
+			0, 0,
+			x_root_attributes.width,
+			x_root_attributes.height,
+			0, 0, 0);
+
+	// User windows are created from the X root window, while ASWM specific
+	// windows are created on the ASWM root window
+	XSelectInput(_aswm.display, _aswm.root_window, FocusChangeMask | EnterWindowMask | LeaveWindowMask | ButtonPressMask | ButtonReleaseMask);
+
+	XSelectInput(_aswm.display, x_root_window, SubstructureRedirectMask | SubstructureNotifyMask | FocusChangeMask | EnterWindowMask | LeaveWindowMask | ButtonPressMask | ButtonReleaseMask);
+
+	XMapWindow(_aswm.display, _aswm.root_window);
 	XSync(_aswm.display, 0);
 
+	printf("PointerRoot %lu\n", PointerRoot);
+	printf("Useful constants:\n");
+	printf("\tNone: %lu\n", None);
+	printf("\tTrue / False: %i / %i\n", True, False);
+	printf("X Root window %lu\n", x_root_window);
+	printf("ASWM Root window %lu\n", _aswm.root_window);
+
 	atexit(aswm_close);
 }
 
+void aswm_create_workspace() {
+	_aswm.workspaces = realloc(_aswm.workspaces, (_aswm.workspace_count+1) * sizeof(Window));
+
+	XWindowAttributes root_attributes;
+	XGetWindowAttributes(_aswm.display, _aswm.root_window, &root_attributes);
+
+	_aswm.workspaces[_aswm.workspace_count] = XCreateSimpleWindow(
+			_aswm.display, _aswm.root_window,
+			0, 0,
+			root_attributes.width, root_attributes.height,
+			0, 0, 0);
+
+	_aswm.current_workspace = _aswm.workspaces[_aswm.workspace_count];
+	_aswm.workspace_count++;
+	XSelectInput(_aswm.display, _aswm.current_workspace, SubstructureNotifyMask);
+	XMapWindow(_aswm.display, _aswm.current_workspace);
+	printf("Create workspace %lu\n", _aswm.current_workspace);
+}
+
 void aswm_event_loop() {
 	for (;;) {
 		XEvent e;
@@ -32,20 +75,19 @@ void aswm_event_loop() {
 
 		switch(e.type) {
 			case CreateNotify:
-				OnCreateNotify(&e.xcreatewindow);
+				// Windows with override_redirect set to True can be safely
+				// ignored, according to the X server specification.
+				if(e.xcreatewindow.override_redirect == False)
+					OnCreateNotify(&_aswm, &e.xcreatewindow);
 				break;
 			case ConfigureRequest:
 				OnConfigureRequest(&e.xconfigurerequest);
 				break;
 			case MapRequest:
 				OnMapRequest(&_aswm, &e.xmaprequest);
-				printf("Map tree:\n");
-				log_tree(_aswm.display, DefaultRootWindow(_aswm.display), 1);
 				break;
 			case UnmapNotify:
 				OnUnmapNotify(&_aswm, &e.xunmap);
-				printf("Unmap tree:\n");
-				log_tree(_aswm.display, DefaultRootWindow(_aswm.display), 1);
 				break;
 			case DestroyNotify:
 				OnDestroyNotify(&e.xdestroywindow);
@@ -75,6 +117,19 @@ void aswm_event_loop() {
 			case ButtonRelease:
 				printf("Release %lu\n", e.xbutton.window);
 				break;
+			case ClientMessage:
+				// TODO: handle this
+				printf("Unhandled client message from window %lu:\n", e.xclient.window);
+				char* atom_name = XGetAtomName(e.xclient.display, e.xclient.message_type);
+				printf("\t%s\n", atom_name);
+				XFree(atom_name);
+				break;
+			case PropertyNotify:
+				// TODO: handle this
+				printf("Unhandled property change for window %lu:\n", e.xclient.window);
+				char* property_name = XGetAtomName(e.xclient.display, e.xclient.message_type);
+				printf("\t%s\n", property_name);
+				XFree(property_name);
 			default:
 				break;
 					/* LOG(WARNING) << "Ignored event"; */
@@ -83,6 +138,7 @@ void aswm_event_loop() {
 }
 
 void aswm_close() {
+	free(_aswm.workspaces);
 	XCloseDisplay(_aswm.display);
 }
 

src/aswm/aswm.h

@@ -5,10 +5,14 @@
 
 typedef struct {
 	Display *display;
-	Window es_de_window;
+	Window root_window;
+	Window* workspaces;
+	unsigned int workspace_count;
+	Window current_workspace;
 } Aswm;
 
 void aswm_open();
+void aswm_create_workspace();
 void aswm_event_loop();
 void aswm_close();
 

src/aswm/event_handlers/configure.c

@@ -2,25 +2,9 @@
 #include <stdio.h>
 
 void OnConfigureRequest(const XConfigureRequestEvent* e) {
-	  printf("XConfigureRequestEvent %lu\n", e->window);
+	  printf("XConfigureRequestEvent %lu (ignored)\n", e->window);
 	  printf("\tx = %i\n", e->x);
 	  printf("\ty = %i\n", e->y);
 	  printf("\tw = %i\n", e->width);
 	  printf("\th = %i\n", e->height);
-
-	  int screen_number = XDefaultScreen(e->display);
-	  int full_width = XDisplayWidth(e->display, screen_number);
-	  int full_height = XDisplayWidth(e->display, screen_number);
-
-	  // Copy fields from e to changes.
-	  XWindowChanges changes;
-	  changes.x = 0;
-	  changes.y = 0;
-	  changes.width = full_width;
-	  changes.height = full_height;
-	  changes.border_width = e->border_width;
-	  changes.sibling = e->above;
-	  changes.stack_mode = e->detail;
-	  // Grant request by calling XConfigureWindow().
-	  XConfigureWindow(e->display, e->window, e->value_mask, &changes);
 }

src/aswm/event_handlers/create.c

@@ -1,6 +1,34 @@
 #include "create.h"
 #include <stdio.h>
+#include <string.h>
+#include <X11/Xutil.h>
 
-void OnCreateNotify(const XCreateWindowEvent* e) {
-	printf("XCreateWindowEvent %lu\n", e->window);
+void OnCreateNotify(Aswm* aswm, const XCreateWindowEvent* e) {
+	printf("XCreateWindowEvent %lu on parent %lu\n", e->window, e->parent);
+	printf("\tx = %i\n", e->x);
+	printf("\ty = %i\n", e->y);
+	printf("\tw = %i\n", e->width);
+	printf("\th = %i\n", e->height);
+	printf("\toverride_redirect = %i\n", e->override_redirect);
+
+	// The WM must subscribe to property changes, notably to implement the
+	// Extended Window Manager Hints (EWMH) propocol
+	XSelectInput(aswm->display, e->window, PropertyChangeMask);
+
+	{
+		XTextProperty text_property;
+		if(XGetWMName(e->display, e->window, &text_property)) {
+			printf("\tname: %s\n", text_property.value);
+		}
+	}
+	{
+		XClassHint class;
+		if(XGetClassHint(e->display, e->window, &class)) {
+			printf("\tclass: %s, %s\n", class.res_class, class.res_name);
+			XFree(class.res_class);
+			XFree(class.res_name);
+		}
+	}
+	if(aswm->workspace_count == 0)
+		aswm_create_workspace();
 }

src/aswm/event_handlers/create.h

@@ -1,3 +1,4 @@
 #include <X11/Xlib.h>
+#include "aswm/aswm.h"
 
-void OnCreateNotify(const XCreateWindowEvent*);
+void OnCreateNotify(Aswm* aswm, const XCreateWindowEvent*);

src/aswm/event_handlers/map.c

@@ -1,29 +1,27 @@
 #include "map.h"
 #include <stdio.h>
-#include <string.h>
-#include <X11/Xutil.h>
+#include "aswm/log/log.h"
+#include "X11/Xutil.h"
 
 void OnMapRequest(Aswm* aswm, const XMapRequestEvent* e) {
 	printf("XMapRequestEvent %lu\n", e->window);
 
-	{
-		XTextProperty text_property;
-		XGetWMName(e->display, e->window, &text_property);
-		printf("\tname: %s\n", text_property.value);
-		if(text_property.value != nullptr && strcmp(text_property.value, "ES-DE") == 0)
-			aswm->es_de_window = e->window;
-	}
-	{
-		XClassHint class;
-		XGetClassHint(e->display, e->window, &class);
-		printf("\tclass: %s, %s\n", class.res_class, class.res_name);
-	}
+	/* XSizeHints* size = XAllocSizeHints(); */
+	/* long supplied; */
+	/* if(XGetWMNormalHints(aswm->display, e->window, size, &supplied)) { */
+		/* printf("\tWMNormalHints:\n"); */
+		/* printf("\t\tMin w:%i\n", size->min_width); */
+		/* printf("\t\tMin h:%i\n", size->min_height); */
+		/* printf("\t\tMax w:%i\n", size->max_width); */
+		/* printf("\t\tMax h:%i\n", size->max_height); */
+		/* printf("\t\tBase w:%i\n", size->base_width); */
+		/* printf("\t\tBase h:%i\n", size->base_height); */
+	/* } */
 
-	int screen_number = XDefaultScreen(e->display);
-	int full_width = XDisplayWidth(e->display, screen_number);
-	int full_height = XDisplayWidth(e->display, screen_number);
+	// Assumes map requests are always received on root and adressed to the
+	// current workspace
+	aswm_map_new_window(e->display, aswm->current_workspace, e->window);
 
-	aswm_map_new_window(e->display, DefaultRootWindow(e->display), e->window);
-
-	/* XSelectInput(e->display, e->window, FocusChangeMask | EnterWindowMask | LeaveWindowMask | ButtonPressMask | ButtonReleaseMask); */
+	printf("Map tree:\n");
+	log_tree(aswm->display, DefaultRootWindow(aswm->display), 1);
 }

src/aswm/event_handlers/unmap.c

@@ -1,12 +1,17 @@
 #include "unmap.h"
 #include <stdio.h>
+#include "aswm/log/log.h"
 
 void OnUnmapNotify(Aswm* aswm, const XUnmapEvent* e) {
 	printf("XUnmapWindow %lu tiled in %lu\n", e->window, e->event);
-	printf("ES-DE window %lu\n", aswm->es_de_window);
-	if(aswm->es_de_window != None)
-		XSetInputFocus(e->display, aswm->es_de_window, RevertToPointerRoot, CurrentTime);
+	/* printf("ES-DE window %lu\n", aswm->es_de_window); */
+	/* if(aswm->es_de_window != None) */
+		/* XSetInputFocus(e->display, aswm->es_de_window, RevertToPointerRoot, CurrentTime); */
 	// Since SubstructureNotify is selected on each frame, e->event corresponds
 	// to the parent of the unmapped window (e->window)
-	aswm_unmap_window(e->display, e->event);
+
+	// Only handles request that refer to the ASWM window hierarchy
+	aswm_unmap_window(e->display, e->event, e->window);
+	printf("Unmap tree:\n");
+	log_tree(aswm->display, DefaultRootWindow(aswm->display), 1);
 }

src/aswm/log/error.h

@@ -0,0 +1,15 @@
+#ifndef ASWM_ERROR_H
+#define ASWM_ERROR_H
+
+#include <X11/Xlib.h>
+#include <stdio.h>
+
+char message_buffer[1024];
+
+int aswm_error_handler( Display *disp, XErrorEvent *xe ) {
+	XGetErrorText(xe->display, xe->error_code, message_buffer, 1024);
+	printf("%s", message_buffer);
+	return 0;
+}
+
+#endif

src/aswm/mapper/mapper.c

@@ -53,23 +53,23 @@ void h_split(Display* display, Window current_tile, Window window_to_map) {
 	XMapWindow(display, window_to_map);
 }
 
-void resize_children_to_tile(Display* display, Window tile) {
+void resize_children_to_parent(Display* display, Window parent) {
 	Window _root_window; // unused
 	Window _grand_parent; // unused
 	Window* children;
 	unsigned int children_count;
 	XQueryTree(
-			display, tile,
+			display, parent,
 			&_root_window, &_grand_parent,
 			&children, &children_count);
-	printf("Current siblings of %lu:\n", tile);
+	printf("  Resize children of %lu:\n", parent);
 	for(auto i = 0; i < children_count; i++)
 		printf("%lu ", children[i]);
 	printf("\n");
 
 	// Resize new children of the parent tile
 	XWindowAttributes parent_attributes;
-	XGetWindowAttributes(display, tile, &parent_attributes);
+	XGetWindowAttributes(display, parent, &parent_attributes);
 
 	for(auto i = 0; i < children_count; i++) {
 		// TODO: currently only hsplit supported
@@ -82,11 +82,11 @@ void resize_children_to_tile(Display* display, Window tile) {
 	XFree(children);
 }
 
-void aswm_unmap_window(Display* display, Window tile) {
+void aswm_unmap_window(Display* display, Window parent, Window window) {
 	// +-------------------------------+
 	// | root                          |
 	// |+-------------+ +-------------+|
-	// || tile        | |             ||
+	// || parent      | |             ||
 	// || +--------+  | |             ||
 	// || | win 1  |  | |             ||
 	// || +--------+  | |             ||
@@ -99,5 +99,26 @@ void aswm_unmap_window(Display* display, Window tile) {
 	// |+-------------+ +-------------+|
 	// +-------------------------------+
 
-	resize_children_to_tile(display, tile);
+	Window _root_window; // unused
+	Window _grand_parent; // unused
+	Window* children;
+	unsigned int children_count;
+	XQueryTree(
+			display, parent,
+			&_root_window, &_grand_parent,
+			&children, &children_count);
+	printf("  Current children of %lu:\n", parent);
+	for(auto i = 0; i < children_count; i++)
+		printf("%lu ", children[i]);
+	printf("\n");
+	for(auto i = 0; i < children_count; i++) {
+		if(children[i] == window)
+			// If the unmap request does not come from a destroy window, we
+			// still want to remove the window from the ASWM hierarchy. It is
+			// the responsability of the client to decide to remap it latter or
+			// not.
+			XReparentWindow(display, window, XDefaultRootWindow(display), 0, 0);
+	}
+
+	resize_children_to_parent(display, parent);
 }

src/aswm/mapper/mapper.h

@@ -6,6 +6,6 @@
 Window create_aswm_root_tile(Display* display, Window root_window);
 
 void aswm_map_new_window(Display* display, Window current_node, Window window_to_map);
-void aswm_unmap_window(Display* display, Window window);
+void aswm_unmap_window(Display* display, Window parent, Window window);
 
 #endif