:PROPERTIES:
:ID:       45da0115-42c7-4a9a-9288-c5d840a69b92
:END:
#+title: Popper
#+filetags: emacs-load

# SPDX-FileCopyrightText: 2022 Richard Brežák <richard@brezak.sk>
#
# SPDX-License-Identifier: LGPL-3.0-or-later

Enable ~popper~, a better version of ~popwin~, which might actually work. It groups popups by context and allows you to specify their exact positioning, or even a custom display function. It also seems to be better at restoring the previous layout.

#+NAME: popper
#+BEGIN_SRC emacs-lisp
  (use-package popper
    :straight (popper :type git :host github :repo "karthink/popper")
    :config
    (setq popper--reference-names nil
          popper--reference-modes nil
          popper--reference-predicates nil)
    (setq popper-reference-buffers
          '("\\*Messages\\*"
            "\\*Warnings\\*"
            "\\*Error\\*"
            "Output\\*$"
            "\\*HS-Error\\*"
            "\\*lsp-help\\*"
            "^\\*Ement compose.*\\*$"
            "^\\*Org Export Dispatcher\\*$"
            "^\\*Org Select\\*$"
            "^\\*R:[^\\*]+\\*$"
            haskell-interactive-mode
            help-mode
            compilation-mode
            rustic-compilation-mode))
    (popper-mode +1))
#+END_SRC

Add a [[id:db1d0122-58d6-4dec-84f6-afcb52937fc7][consult]] source for popped buffers.

#+begin_src emacs-lisp
    (with-eval-after-load 'consult
      (setq magic_rb/consult-source-popper
            `(:name "popper"
              :narrow ?P
              :category buffer
              :face     consult-buffer
              :history  buffer-name-history
              :state    consult--buffer-state
              :items
              (lambda ()
                (let ((group-name (when popper-group-function
                                    (with-current-buffer buf (funcall popper-group-function)))))
                  (mapcar #'buffer-name
                          (append
                           (mapcar #'cdr (alist-get group-name popper-buried-popup-alist))
                           (mapcar #'cdr (alist-get group-name popper-open-popup-alist))))))))

      (add-to-list 'consult-buffer-sources 'magic_rb/consult-source-popper 'append))
#+end_src

Force user buffer switching to also obey ~display-buffer-alist~.

#+begin_src emacs-lisp
  (setq switch-to-buffer-obey-display-actions t)
#+end_src

Set almost all popups to ~meow-motion-mode~, except for [[id:986ca7a5-d225-49bb-9e35-f2dffafe8aee][Org Mode]] popups and [[id:8fbb19be-bb8d-4fef-8a6a-9d5a3f5d06ec][Vterm]].

#+begin_src emacs-lisp :tangle no
  (defun magic_rb/popper-meow-motion (buf &optional _act)
    (with-current-buffer buf
      (when
          (and (popper-popup-p buf)
               (not (equal major-mode 'vterm-mode))
               (not ement-room-compose-buffer))
        (meow-normal-mode) (meow-motion-mode))))

  (advice-add 'popper-display-control-p :after 'magic_rb/popper-meow-motion)
#+end_src