Implement IPC binding event (keyboard)

This implements the IPC binding event for keyboard bindings.  It is
slightly different from the i3 implementation [1] since sway supports
more than one non-modifier key in a binding. Thus the json interface has
been changed from:

    {
      ...
      "symbol": "t",
      ...
    }

to:

    {
      ...
      "symbols": [ "t" ],
      ...
    }

[1] http://i3wm.org/docs/ipc.html#_binding_event

1 files changed, 47 insertions, 0 deletions

diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index f3a4647b..d8d8434c 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -298,6 +298,8 @@ void ipc_client_handle_command(struct ipc_client *client) {
                                 client->subscribed_events |= IPC_EVENT_MODE;
                         } else if (strcmp(event_type, "modifier") == 0) {
                                 client->subscribed_events |= IPC_EVENT_MODIFIER;
+                        } else if (strcmp(event_type, "binding") == 0) {
+                                client->subscribed_events |= IPC_EVENT_BINDING;
                         } else {
                                 ipc_send_reply(client, "{\"success\": false}", 18);
                                 ipc_client_disconnect(client);
@@ -633,3 +635,48 @@ void ipc_event_modifier(uint32_t modifier, const char *state) {
 
         json_object_put(obj); // free
 }
+
+static void ipc_event_binding(json_object *sb_obj) {
+        json_object *obj = json_object_new_object();
+        json_object_object_add(obj, "change", json_object_new_string("run"));
+        json_object_object_add(obj, "binding", sb_obj);
+
+        const char *json_string = json_object_to_json_string(obj);
+        ipc_send_event(json_string, IPC_EVENT_BINDING);
+
+        json_object_put(obj); // free
+}
+
+void ipc_event_binding_keyboard(struct sway_binding *sb) {
+        json_object *sb_obj = json_object_new_object();
+        json_object_object_add(sb_obj, "command", json_object_new_string(sb->command));
+
+        const char *names[10];
+
+        int len = get_modifier_names(names, sb->modifiers);
+        int i;
+        json_object *modifiers = json_object_new_array();
+        for (i = 0; i < len; ++i) {
+                json_object_array_add(modifiers, json_object_new_string(names[i]));
+        }
+
+        json_object_object_add(sb_obj, "event_state_mask", modifiers);
+
+        // TODO: implement bindcode
+        json_object_object_add(sb_obj, "input_code", json_object_new_int(0));
+
+        json_object *symbols = json_object_new_array();
+        uint32_t keysym;
+        char buffer[64];
+        for (i = 0; i < sb->keys->length; ++i) {
+                keysym = *(uint32_t *)sb->keys->items[i];
+                if (xkb_keysym_get_name(keysym, buffer, 64) > 0) {
+                        json_object_array_add(symbols, json_object_new_string(buffer));
+                }
+        }
+
+        json_object_object_add(sb_obj, "symbols", symbols);
+        json_object_object_add(sb_obj, "input_type", json_object_new_string("keyboard"));
+
+        ipc_event_binding(sb_obj);
+}