i3 - improved tiling WM

Handle EWMH requests to change current desktop

Patch status: needinfo

Patch by Tony Crisci

Long description:

This request is used by pagers and bars to change the current
desktop likely as a result of some user action. We interpret this as
a request to focus the given workspace.

for more information see:

http://standards.freedesktop.org/wm-spec/latest/ar01s03.html#idm140251368135008

To apply this patch, use:
curl http://cr.i3wm.org/patch/617/raw.patch | git am

b/src/handlers.c

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@@ -806,6 +806,39 @@ static void handle_client_message(xcb_client_message_event_t *event) {
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             DLOG("Not handling WM_CHANGE_STATE request. (window = %d, state = %d)\n", event->window, event->data.data32[0]);
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         }
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+    } else if (event->type == A__NET_CURRENT_DESKTOP) {
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+        /* This request is used by pagers and bars to change the current
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+         * desktop likely as a result of some user action. We interpret this as
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+         * a request to focus the given workspace. See
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+         * http://standards.freedesktop.org/wm-spec/latest/ar01s03.html#idm140251368135008
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+         * */
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+        Con *output;
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+        uint32_t idx = 0;
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+        DLOG("Request to change current desktop to index %d\n", event->data.data32[0]);
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+
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+        TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
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+            Con *ws;
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+            TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
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+                if (STARTS_WITH(ws->name, "__"))
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+                    continue;
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+
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+                if (idx == event->data.data32[0]) {
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+                    /* data32[1] is a timestamp used to prevent focus race conditions */
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+                    if (event->data.data32[1])
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+                        last_timestamp = event->data.data32[1];
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+
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+
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+                    DLOG("Handling request to focus workspace %s\n", ws->name);
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+
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+                    workspace_show(ws);
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+                    tree_render();
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+
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+                    return;
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+                }
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+
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+                ++idx;
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+            }
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+        }
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     } else {
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         DLOG("unhandled clientmessage\n");
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         return;