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;;; corfu-info.el --- Show candidate information in separate buffer -*- lexical-binding: t -*-
;; Copyright (C) 2022 Free Software Foundation, Inc.
;; Author: Daniel Mendler <mail@daniel-mendler.de>
;; Maintainer: Daniel Mendler <mail@daniel-mendler.de>
;; Created: 2022
;; Version: 0.1
;; Package-Requires: ((emacs "27.1") (corfu "0.25"))
;; Homepage: https://github.com/minad/corfu
;; This file is part of GNU Emacs.
;; 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:
;; This Corfu extension provides commands to show additional information to the
;; candidates in a separate buffer. The commands `corfu-info-location' and
;; `corfu-info-documentation' are bound by default in the `corfu-map' to M-g and
;; M-h respectively.
;;; Code:
(require 'corfu)
(eval-when-compile
(require 'subr-x))
(defun corfu-info--restore-on-next-command ()
"Restore window configuration before next command."
(let ((config (current-window-configuration))
(other other-window-scroll-buffer)
(restore (make-symbol "corfu--restore")))
(fset restore
(lambda ()
(setq other-window-scroll-buffer other)
(unless (memq this-command '(scroll-other-window scroll-other-window-down))
(when (memq this-command '(corfu-quit corfu-reset))
(setq this-command #'ignore))
(remove-hook 'pre-command-hook restore)
(set-window-configuration config))))
(add-hook 'pre-command-hook restore)))
;;;###autoload
(defun corfu-info-documentation ()
"Show documentation of current candidate."
(interactive)
;; Company support, taken from `company.el', see `company-show-doc-buffer'.
(when (< corfu--index 0)
(user-error "No candidate selected"))
(if-let* ((fun (plist-get corfu--extra :company-doc-buffer))
(res (funcall fun (nth corfu--index corfu--candidates))))
(let ((buf (or (car-safe res) res)))
(corfu-info--restore-on-next-command)
(setq other-window-scroll-buffer (get-buffer buf))
(set-window-start (display-buffer buf t) (or (cdr-safe res) (point-min))))
(user-error "No documentation available")))
;;;###autoload
(defun corfu-info-location ()
"Show location of current candidate."
(interactive)
;; Company support, taken from `company.el', see `company-show-location'.
(when (< corfu--index 0)
(user-error "No candidate selected"))
(if-let* ((fun (plist-get corfu--extra :company-location))
(loc (funcall fun (nth corfu--index corfu--candidates))))
(let ((buf (or (and (bufferp (car loc)) (car loc)) (find-file-noselect (car loc) t))))
(corfu-info--restore-on-next-command)
(setq other-window-scroll-buffer buf)
(with-selected-window (display-buffer buf t)
(save-restriction
(widen)
(if (bufferp (car loc))
(goto-char (cdr loc))
(goto-char (point-min))
(forward-line (1- (cdr loc))))
(set-window-start nil (point)))))
(user-error "No candidate location available")))
;; Emacs 28: Do not show Corfu commands with M-X
(put #'corfu-info-location 'completion-predicate #'ignore)
(put #'corfu-info-documentation 'completion-predicate #'ignore)
(provide 'corfu-info)
;;; corfu-info.el ends here
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