Introduced a new GET_BINDING_MODES message type and reply. (#2376)

This type dumps all currently configured binding modes.

fixes #2375

src/ipc.c

@@ -958,6 +958,28 @@ IPC_HANDLER(get_bar_config) {
     y(free);
 }
 
+/*
+ * Returns a list of configured binding modes
+ *
+ */
+IPC_HANDLER(get_binding_modes) {
+    yajl_gen gen = ygenalloc();
+
+    y(array_open);
+    struct Mode *mode;
+    SLIST_FOREACH(mode, &modes, modes) {
+        ystr(mode->name);
+    }
+    y(array_close);
+
+    const unsigned char *payload;
+    ylength length;
+    y(get_buf, &payload, &length);
+
+    ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_BINDING_MODES, payload);
+    y(free);
+}
+
 /*
  * Callback for the YAJL parser (will be called when a string is parsed).
  *
@@ -1034,7 +1056,7 @@ IPC_HANDLER(subscribe) {
 
 /* The index of each callback function corresponds to the numeric
  * value of the message type (see include/i3/ipc.h) */
-handler_t handlers[8] = {
+handler_t handlers[9] = {
     handle_command,
     handle_get_workspaces,
     handle_subscribe,
@@ -1043,6 +1065,7 @@ handler_t handlers[8] = {
     handle_get_marks,
     handle_get_bar_config,
     handle_get_version,
+    handle_get_binding_modes,
 };
 
 /*