[amiwm] Implement a keyboard shortcut to move a client to a different screen

This allows a keyboard shortcut to move a client to a different amiwm
screen.  That way when you have things like Firefox restart every window
in a single screen, you can quickly move screens to where they should be.

MODULES.md

@@ -75,11 +75,11 @@ Currently the following are defined:
 rotatescreens  -  Move the frontmost screen to the back
 raisewindow    -  Rotate the bottom window to the top of the screen
 lowerwindow    -  Rotate the top window to the bottom of the screen
+rotatewindow   -  Move the current window to the next screen, rotate screen
 front          -  Move the window in which the key is pressed to the front
 back           -  Move the window in which the key is pressed to the back
 iconify        -  Iconify the window in which the key is pressed
 
-
 #### Example
 
 Module "Keyboard" "\

client.c

@@ -379,3 +379,18 @@ void flushclients()
     rmclient(c);
   }
 }
+
+/*
+ * Reparent the given client to the given screen.
+ *
+ * This moves the given client to the given screen.
+ */
+void
+reparent_client(Scrn *s, Client *client)
+{
+    client->scr = s;
+    if(client->parent != client->scr->root)
+      XReparentWindow(dpy, client->parent, s->back, client->x, client->y);
+    setstringprop(client->window, amiwm_screen, s->deftitle);
+    sendconfig(client);
+}

client.h

@@ -51,5 +51,7 @@ extern void getstate(Client *);
 extern void grav_map_frame_to_win(Client *, int, int, int *, int *);
 extern void grav_map_win_to_frame(Client *, int, int, int *, int *);
 extern void setclientstate(Client *, int);
+extern void reparent_client(struct _Scrn *s, Client *client);
+
 
 #endif

icon.c

@@ -156,12 +156,16 @@ void reparenticon(Icon *i, Scrn *s, int x, int y)
   i->next=s->icons;
   s->icons=i;
   if(i->client) {
+#if 1
+    reparent_client(s, i->client);
+#else
     i->client->scr=s;
     if(i->client->parent != i->client->scr->root)
       XReparentWindow(dpy, i->client->parent, s->back,
 		      i->client->x, i->client->y);
     setstringprop(i->client->window, amiwm_screen, s->deftitle);
     sendconfig(i->client);
+#endif
   }
   if(os)
     selecticon(i);

kbdlexer.l

@@ -44,6 +44,7 @@ int parse_keyword(char *str, YYSTYPE *val)
      { "lowerwindow", (mdfuncp)md_rotate_window_lower },
      { "raisewindow", (mdfuncp)md_rotate_window_raise },
      { "rotatescreens", (mdfuncp)k_rotscreens },
+     { "rotatewindow", (mdfuncp)md_rotate_window_desktop },
    };
 #define N_FUNC (sizeof(functab)/sizeof(functab[0]))
    struct { char *name; int token, num; } kwtab[] = {

libami/libami.h

@@ -370,6 +370,7 @@ extern int md_iconify(Window);
 extern int md_errormsg(Window, char *);
 extern int md_rotate_window_raise(Window);
 extern int md_rotate_window_lower(Window);
+extern int md_rotate_window_desktop(Window);
 
 /* eventdispatcher.c */
 extern void cx_event_broker(int, unsigned long, int (*)(XEvent*));

libami/mdscreen.c

@@ -32,6 +32,11 @@ int md_rotate_window_lower(XID id)
   return md_command00(id, MCMD_ROTATE_WINDOW_LOWER);
 }
 
+int md_rotate_window_desktop(XID id)
+{
+  return md_command00(id, MCMD_WINDOW_MOVE_NEXT_DESKTOP);
+}
+
 int md_errormsg(Window id, char *str)
 {
   return md_command0(id, MCMD_ERRORMSG, str, strlen(str));

module.c

@@ -45,6 +45,7 @@ extern void remove_fd_from_set(int);
 extern void screentoback();
 extern void raiselowerclient(Client *, int);
 extern void wberror(Scrn *, char *);
+extern void reparent(Client *);
 
 extern Icon *createappicon(struct module *, Window, char *,
 			   Pixmap, Pixmap, Pixmap, int, int);
@@ -525,6 +526,20 @@ static void handle_module_cmd(struct module *m, char *data, int data_len)
         reply_module(m, NULL, 0);
         break;
     }
+    case MCMD_WINDOW_MOVE_NEXT_DESKTOP:
+        /* Move the current window, if any, to the next desktop */
+        c = NULL;
+        if(! XFindContext(dpy, id, client_context, (XPointer*)&c)) {
+          /* Get the current screen */
+          scr=getscreen(id);
+          /* Rotate screen, get the now front screen */
+          screentoback();
+          scr = get_front_scr();
+          /* Assign this client to next screen */
+          reparent_client(scr, c);
+        }
+        reply_module(m, NULL, 0);
+        break;
     break;
   default:
     reply_module(m, NULL, -1);

module.h

@@ -17,6 +17,7 @@
 #define MCMD_ROTATE_WINDOW_RAISE 19
 #define MCMD_ROTATE_WINDOW_LOWER 20
 #define MCMD_UPDATE_BATTERY 21
+#define MCMD_WINDOW_MOVE_NEXT_DESKTOP 22
 
 struct mcmd_header {
   XID id;