Add `-t get_marks` and use more i3-like marks

In i3 every mark is unique and one mark cannot be used in more than one
window, sway behavior has been amended to match this.
`swaymsg -t get_marks` will now return an array of all marks used in sway.

See #98

1 files changed, 13 insertions, 0 deletions

diff --git a/sway/commands/mark.c b/sway/commands/mark.c
index 919883b0..c1d959df 100644
--- a/sway/commands/mark.c
+++ b/sway/commands/mark.c
@@ -5,6 +5,15 @@
 #include "list.h"
 #include "stringop.h"
 
+static void find_marks_callback(swayc_t *container, void *_mark) {
+        char *mark = (char *)_mark;
+
+        int index;
+        if (container->marks && ((index = list_seq_find(container->marks, (int (*)(const void *, const void *))strcmp, mark)) != -1)) {
+                list_del(container->marks, index);
+        }
+}
+
 struct cmd_results *cmd_mark(int argc, char **argv) {
         struct cmd_results *error = NULL;
         if (config->reading) return cmd_results_new(CMD_FAILURE, "mark", "Can't be used in config file.");
@@ -30,6 +39,10 @@ struct cmd_results *cmd_mark(int argc, char **argv) {
 
         if (argc) {
                 char *mark = join_args(argv, argc);
+
+                // Remove all existing marks of this type
+                container_map(&root_container, find_marks_callback, mark);
+
                 if (view->marks) {
                         if (add) {
                                 int index;