1 files changed, 52 insertions, 0 deletions
diff --git a/src/nvim/winfloat.c b/src/nvim/winfloat.c
index a0f426e30d..e3ca0ff139 100644
--- a/src/nvim/winfloat.c
+++ b/src/nvim/winfloat.c
@@ -6,7 +6,9 @@
 #include "klib/kvec.h"
 #include "nvim/api/private/defs.h"
 #include "nvim/api/private/helpers.h"
+#include "nvim/api/vim.h"
 #include "nvim/ascii_defs.h"
+#include "nvim/autocmd.h"
 #include "nvim/buffer_defs.h"
 #include "nvim/drawscreen.h"
 #include "nvim/globals.h"
@@ -17,6 +19,7 @@
 #include "nvim/mouse.h"
 #include "nvim/move.h"
 #include "nvim/option.h"
+#include "nvim/option_defs.h"
 #include "nvim/optionstr.h"
 #include "nvim/pos_defs.h"
 #include "nvim/strings.h"
@@ -354,3 +357,52 @@ win_T *win_float_find_altwin(const win_T *win, const tabpage_T *tp)
   return (tabpage_win_valid(tp, tp->tp_prevwin) && tp->tp_prevwin != win) ? tp->tp_prevwin
                                                                           : tp->tp_firstwin;
 }
+
+/// create a floating preview window.
+///
+/// @param[in] bool enter floating window.
+/// @param[in] bool create a new buffer for window.
+///
+/// @return win_T
+win_T *win_float_create(bool enter, bool new_buf)
+{
+  WinConfig config = WIN_CONFIG_INIT;
+  config.col = curwin->w_wcol;
+  config.row = curwin->w_wrow;
+  config.relative = kFloatRelativeEditor;
+  config.focusable = false;
+  config.anchor = 0;  // NW
+  config.noautocmd = true;
+  config.hide = true;
+  config.style = kWinStyleMinimal;
+  Error err = ERROR_INIT;
+
+  block_autocmds();
+  win_T *wp = win_new_float(NULL, false, config, &err);
+  if (!wp) {
+    unblock_autocmds();
+    return NULL;
+  }
+
+  if (new_buf) {
+    Buffer b = nvim_create_buf(false, true, &err);
+    if (!b) {
+      win_remove(wp, NULL);
+      win_free(wp, NULL);
+      unblock_autocmds();
+      return NULL;
+    }
+    buf_T *buf = find_buffer_by_handle(b, &err);
+    buf->b_p_bl = false;  // unlist
+    set_option_direct_for(kOptBufhidden, STATIC_CSTR_AS_OPTVAL("wipe"), OPT_LOCAL, 0, kOptReqBuf,
+                          buf);
+    win_set_buf(wp, buf, &err);
+  }
+  unblock_autocmds();
+  wp->w_p_diff = false;
+  wp->w_float_is_info = true;
+  if (enter) {
+    win_enter(wp, false);
+  }
+  return wp;
+}