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cider-popup.el
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cider-popup.el
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;;; cider-popup.el --- Creating and quitting popup buffers -*- lexical-binding: t; -*-
;; Copyright © 2015-2024 Bozhidar Batsov, Artur Malabarba and CIDER contributors
;; Author: Artur Malabarba <bruce.connor.am@gmail.com>
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Common functionality for dealing with popup buffers.
;;; Code:
(require 'subr-x)
(define-minor-mode cider-popup-buffer-mode
"Mode for CIDER popup buffers."
:lighter (" cider-tmp")
:keymap '(("q" . cider-popup-buffer-quit-function)))
(defvar-local cider-popup-buffer-quit-function #'cider-popup-buffer-quit
"The function that is used to quit a temporary popup buffer.")
(defun cider-popup-buffer-quit-function (&optional kill-buffer-p)
"Wrapper to invoke the function `cider-popup-buffer-quit-function'.
KILL-BUFFER-P is passed along."
(interactive)
(funcall cider-popup-buffer-quit-function kill-buffer-p))
(defun cider-popup-buffer (name &optional select mode ancillary)
"Create new popup buffer called NAME.
If SELECT is non-nil, select the newly created window.
If major MODE is non-nil, enable it for the popup buffer.
If ANCILLARY is non-nil, the buffer is added to `cider-ancillary-buffers'
and automatically removed when killed."
(thread-first (cider-make-popup-buffer name mode ancillary)
(buffer-name)
(cider-popup-buffer-display select)))
(defun cider-popup-buffer-display (buffer-name &optional select)
"Display the buffer identified by BUFFER-NAME.
If SELECT is non-nil, select the buffer.
You can customize how the window will be chosen/created
by adding BUFFER-NAME to the `special-display-buffer-names' list."
(let ((buffer-name (if (bufferp buffer-name) ;; ensure buffer-name is a string
(buffer-name buffer-name)
buffer-name)))
;; if `buffer-name' belongs to `special-display-buffer-names',
;; delegate to that mechanism the displaying of the buffer,
;; otherwise the displaying would happen twice (ance through `special-display-buffer-names',
;; another time through `cider-popup-buffer-display'):
(if (and (boundp 'special-display-buffer-names)
(seq-find (lambda (entry)
;; entry can be either a list or a string
(equal (if (listp entry) (car entry) entry) buffer-name))
special-display-buffer-names))
(progn
(display-buffer buffer-name)
(when select
(when-let ((window (get-buffer-window buffer-name)))
(select-window window))))
(let ((window (get-buffer-window buffer-name 'visible)))
(when window
(with-current-buffer buffer-name
(set-window-point window (point))))
;; If the buffer we are popping up is already displayed in the selected
;; window, the below `inhibit-same-window' logic will cause it to be
;; displayed twice - so we early out in this case. Note that we must check
;; `selected-window', as async request handlers are executed in the context
;; of the current connection buffer (i.e. `current-buffer' is dynamically
;; bound to that).
(unless (eq window (selected-window))
;; Non nil `inhibit-same-window' ensures that current window is not covered
;; Non nil `inhibit-switch-frame' ensures that the other frame is not selected
;; if that's where the buffer is being shown.
(funcall (if select #'pop-to-buffer #'display-buffer)
buffer-name `(nil . ((inhibit-same-window .
;; A non-nil value prevents the same window from being used for display:
,pop-up-windows)
(reusable-frames .
;; choose any visible frame
visible)))))))
(get-buffer buffer-name)))
(defun cider-popup-buffer-quit (&optional kill)
"Quit the current (temp) window.
Bury its buffer using `quit-restore-window'.
If prefix argument KILL is non-nil, kill the buffer instead of burying it."
(interactive)
(quit-restore-window (selected-window) (if kill 'kill 'append)))
(defvar-local cider-popup-output-marker nil)
(defvar cider-ancillary-buffers nil
"A list ancillary buffers created by the various CIDER commands.
We track them mostly to be able to clean them up on quit.")
(defun cider-make-popup-buffer (name &optional mode ancillary)
"Create a temporary buffer called NAME using major MODE (if specified).
If ANCILLARY is non-nil, the buffer is added to `cider-ancillary-buffers'
and automatically removed when killed."
(with-current-buffer (get-buffer-create name)
(kill-all-local-variables)
(setq buffer-read-only nil)
(erase-buffer)
(when mode
(funcall mode))
(cider-popup-buffer-mode 1)
(setq cider-popup-output-marker (point-marker))
(setq buffer-read-only t)
(when ancillary
(add-to-list 'cider-ancillary-buffers name)
(add-hook 'kill-buffer-hook
(lambda ()
(setq cider-ancillary-buffers
(remove name cider-ancillary-buffers)))
nil 'local))
(current-buffer)))
(defun cider-emit-into-popup-buffer (buffer value &optional face inhibit-indent)
"Emit into BUFFER the provided VALUE optionally using FACE.
Indent emitted value (usually a sexp) unless INHIBIT-INDENT is specified
and non-nil."
;; Long string output renders Emacs unresponsive and users might intentionally
;; kill the frozen popup buffer. Therefore, we don't re-create the buffer and
;; silently ignore the output.
(when (buffer-live-p buffer)
(with-current-buffer buffer
(let ((inhibit-read-only t)
(buffer-undo-list t)
(moving (= (point) cider-popup-output-marker)))
(save-excursion
(goto-char cider-popup-output-marker)
(let ((value-str (format "%s" value)))
(when face
(add-face-text-property 0 (length value-str) face nil value-str))
(insert value-str))
(unless inhibit-indent
(indent-sexp))
(set-marker cider-popup-output-marker (point)))
(when moving (goto-char cider-popup-output-marker))))))
(provide 'cider-popup)
;;; cider-popup.el ends here