Feature: implement GET_MARKS

docs/ipc

@@ -59,6 +59,9 @@ GET_TREE (4)::
 	Gets the layout tree. i3 uses a tree as data structure which includes
 	every container. The reply will be the JSON-encoded tree (see the reply
 	section).
+GET_MARKS (5)::
+	Gets a list of marks. The reply will be a JSON-encoded list of window marks
+	(see reply section).
 
 So, a typical message could look like this:
 --------------------------------------------------
@@ -110,6 +113,8 @@ GET_OUTPUTS (3)::
 	Reply to the GET_OUTPUTS message.
 GET_TREE (4)::
 	Reply to the GET_TREE message.
+GET_MARKS (5)::
+	Reply to the GET_MARKS message.
 
 === COMMAND reply
 
@@ -416,6 +421,14 @@ JSON dump:
    }
  ]
 }
+
+
+=== GET_MARKS reply
+
+The reply consists of a single array of strings for each
+window that has a mark.
+
+If no window has a mark the response will be the empty array [].
 ------------------------
 
 

include/i3/ipc.h

@@ -38,6 +38,8 @@
 /** Requests the tree layout from i3 */
 #define I3_IPC_MESSAGE_TYPE_GET_TREE            4
 
+/** Request the current defined marks from i3 */
+#define I3_IPC_MESSAGE_TYPE_GET_MARKS           5
 
 /*
  * Messages from i3 to clients
@@ -59,6 +61,8 @@
 /** Tree reply type */
 #define I3_IPC_REPLY_TYPE_TREE                  4
 
+/** Marks reply type*/
+#define I3_IPC_REPLY_TYPE_MARKS                 5
 
 /*
  * Events from i3 to clients. Events have the first bit set high.

src/ipc.c

@@ -330,6 +330,7 @@ IPC_HANDLER(tree) {
     y(free);
 }
 
+
 /*
  * Formats the reply message for a GET_WORKSPACES request and sends it to the
  * client
@@ -460,6 +461,34 @@ IPC_HANDLER(get_outputs) {
     y(free);
 }
 
+/*
+ * Formats the reply message for a GET_MARKS request and sends it to the
+ * client
+ *
+ */
+IPC_HANDLER(get_marks) {
+#if YAJL_MAJOR >= 2
+    yajl_gen gen = yajl_gen_alloc(NULL);
+#else
+    yajl_gen gen = yajl_gen_alloc(NULL, NULL);
+#endif
+    y(array_open);
+
+    Con *con;
+    TAILQ_FOREACH(con, &all_cons, all_cons)
+        if (con->mark != NULL)
+            ystr(con->mark);
+
+    y(array_close);
+
+    const unsigned char *payload;
+    unsigned int length;
+    y(get_buf, &payload, &length);
+
+    ipc_send_message(fd, payload, I3_IPC_REPLY_TYPE_MARKS, length);
+    y(free);
+}
+
 /*
  * Callback for the YAJL parser (will be called when a string is parsed).
  *
@@ -547,12 +576,13 @@ 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[5] = {
+handler_t handlers[6] = {
     handle_command,
     handle_get_workspaces,
     handle_subscribe,
     handle_get_outputs,
-    handle_tree
+    handle_tree,
+    handle_get_marks
 };
 
 /*