+static int list_x11_keymaps(DBusConnection *bus, char **args, unsigned n) {
+ _cleanup_fclose_ FILE *f = NULL;
+ _cleanup_strv_free_ char **list = NULL;
+ char line[LINE_MAX];
+ enum {
+ NONE,
+ MODELS,
+ LAYOUTS,
+ VARIANTS,
+ OPTIONS
+ } state = NONE, look_for;
+ int r;
+
+ if (n > 2) {
+ log_error("Too many arguments.");
+ return -EINVAL;
+ }
+
+ f = fopen("/usr/share/X11/xkb/rules/base.lst", "re");
+ if (!f) {
+ log_error("Failed to open keyboard mapping list. %m");
+ return -errno;
+ }
+
+ if (streq(args[0], "list-x11-keymap-models"))
+ look_for = MODELS;
+ else if (streq(args[0], "list-x11-keymap-layouts"))
+ look_for = LAYOUTS;
+ else if (streq(args[0], "list-x11-keymap-variants"))
+ look_for = VARIANTS;
+ else if (streq(args[0], "list-x11-keymap-options"))
+ look_for = OPTIONS;
+ else
+ assert_not_reached("Wrong parameter");
+
+ FOREACH_LINE(line, f, break) {
+ char *l, *w;
+
+ l = strstrip(line);
+
+ if (isempty(l))
+ continue;
+
+ if (l[0] == '!') {
+ if (startswith(l, "! model"))
+ state = MODELS;
+ else if (startswith(l, "! layout"))
+ state = LAYOUTS;
+ else if (startswith(l, "! variant"))
+ state = VARIANTS;
+ else if (startswith(l, "! option"))
+ state = OPTIONS;
+ else
+ state = NONE;
+
+ continue;
+ }
+
+ if (state != look_for)
+ continue;
+
+ w = l + strcspn(l, WHITESPACE);
+
+ if (n > 1) {
+ char *e;
+
+ if (*w == 0)
+ continue;
+
+ *w = 0;
+ w++;
+ w += strspn(w, WHITESPACE);
+
+ e = strchr(w, ':');
+ if (!e)
+ continue;
+
+ *e = 0;
+
+ if (!streq(w, args[1]))
+ continue;
+ } else
+ *w = 0;
+
+ r = strv_extend(&list, l);
+ if (r < 0)
+ return log_oom();
+ }
+
+ if (strv_isempty(list)) {
+ log_error("Couldn't find any entries.");
+ return -ENOENT;
+ }
+
+ strv_sort(list);
+ strv_uniq(list);
+
+ pager_open_if_enabled();
+
+ strv_print(list);
+ return 0;
+}
+