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diff --git a/lib/eos/jao-buffers.el b/lib/eos/jao-buffers.el
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+;;; jao-buffers.el --- deal with buffers and windows  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2026  Jose Antonio Ortega Ruiz
+
+;; Author: Jose Antonio Ortega Ruiz <mail@jao.io>
+;; Keywords: files
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+;;;; attached buffers
+(defun jao-display-buffer-below-selected (buffer alist)
+  (delete-other-windows-vertically)
+  (display-buffer-below-selected buffer alist))
+
+(defun jao-display-below-eldoc (buffer alist)
+  (let ((w (selected-window)))
+    (pop-to-buffer "*eldoc*" nil t)
+    (jao-display-buffer-below-selected buffer alist)
+    (select-window w t)))
+
+(defun jao-attached-buffer-entry (name-rx height)
+  `(,name-rx (display-buffer-reuse-window
+              jao-display-buffer-below-selected)
+             (window-height . ,(or height 25))))
+
+;;;###autoload
+(defun jao-attach-below-eldoc (rx &optional h)
+  (add-to-list 'display-buffer-alist
+               `(,rx
+                 (display-buffer-reuse-window jao-display-below-eldoc)
+                 (height . (or ,h 0.5)))))
+
+;;;###autoload
+(defmacro jao-with-attached-buffer (name-rx height &rest body)
+  (declare (indent defun))
+  `(let ((display-buffer-alist '(,(jao-attached-buffer-entry name-rx height))))
+     ,@body))
+
+;;;###autoload
+(defun jao-define-attached-buffer (name-rx &optional height)
+  (add-to-list 'display-buffer-alist
+               (jao-attached-buffer-entry name-rx height)))
+
+;;;; same mode
+;;;###autoload
+(defun jao-buffer-same-mode (&optional mode pre-fn switch-fn)
+  (interactive)
+  (let* ((mode (or mode major-mode))
+         (modes (if (symbolp mode) (list mode) mode))
+         (pred `(lambda (b)
+                  (let ((b (get-buffer (if (consp b) (car b) b))))
+                    (member (buffer-local-value 'major-mode b)
+                            ',modes))))
+         (buff (read-buffer "Buffer: " nil t pred)))
+    (when pre-fn (funcall pre-fn))
+    (if switch-fn (funcall switch-fn buff) (switch-to-buffer buff))))
+
+;;;###autoload
+(defun jao-buffer-same-mode-cmd (&optional pop)
+  (interactive "P")
+  (jao-buffer-same-mode nil nil (and pop #'pop-to-buffer)))
+
+(provide 'jao-buffers)
+;;; jao-buffers.el ends here