api: nvim_list_uis #8004

ref #7438
closes #4842

src/nvim/api/vim.c

@@ -35,6 +35,7 @@
 #include "nvim/os/input.h"
 #include "nvim/viml/parser/expressions.h"
 #include "nvim/viml/parser/parser.h"
+#include "nvim/ui.h"
 
 #define LINE_BUFFER_SIZE 4096
 
@@ -1468,3 +1469,12 @@ Float nvim__id_float(Float flt)
 {
   return flt;
 }
+
+/// Gets a list of dictionaries representing attached UIs.
+///
+/// @return Array of UI dictionaries
+Array nvim_list_uis(void)
+  FUNC_API_SINCE(4)
+{
+  return ui_array();
+}