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corfu-info.el (4881B)

      1 ;;; corfu-info.el --- Show candidate information in separate buffer -*- lexical-binding: t -*-
      2 
      3 ;; Copyright (C) 2022-2024 Free Software Foundation, Inc.
      4 
      5 ;; Author: Daniel Mendler <mail@daniel-mendler.de>
      6 ;; Maintainer: Daniel Mendler <mail@daniel-mendler.de>
      7 ;; Created: 2022
      8 ;; Version: 1.3
      9 ;; Package-Requires: ((emacs "27.1") (compat "29.1.4.4") (corfu "1.3"))
     10 ;; Homepage: https://github.com/minad/corfu
     11 
     12 ;; This file is part of GNU Emacs.
     13 
     14 ;; This program is free software: you can redistribute it and/or modify
     15 ;; it under the terms of the GNU General Public License as published by
     16 ;; the Free Software Foundation, either version 3 of the License, or
     17 ;; (at your option) any later version.
     18 
     19 ;; This program is distributed in the hope that it will be useful,
     20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
     21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     22 ;; GNU General Public License for more details.
     23 
     24 ;; You should have received a copy of the GNU General Public License
     25 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
     26 
     27 ;;; Commentary:
     28 
     29 ;; This Corfu extension provides commands to show additional information to the
     30 ;; candidates in a separate buffer.  The commands `corfu-info-location' and
     31 ;; `corfu-info-documentation' are bound by default in the `corfu-map' to M-g and
     32 ;; M-h respectively.
     33 
     34 ;;; Code:
     35 
     36 (require 'corfu)
     37 (eval-when-compile
     38   (require 'subr-x))
     39 
     40 (defun corfu-info--restore-on-next-command ()
     41   "Restore window configuration before next command."
     42   (let ((config (current-window-configuration))
     43         (other other-window-scroll-buffer)
     44         (restore (make-symbol "corfu--restore")))
     45     (fset restore
     46           (lambda ()
     47             (setq other-window-scroll-buffer other)
     48             (unless (memq this-command '(scroll-other-window scroll-other-window-down))
     49               (when (memq this-command '(corfu-quit corfu-reset))
     50                 (setq this-command #'ignore))
     51               (remove-hook 'pre-command-hook restore)
     52               (set-window-configuration config))))
     53     (add-hook 'pre-command-hook restore)))
     54 
     55 (defun corfu-info--display-buffer (buffer name)
     56   "Display BUFFER and return window displaying the buffer.
     57 Make the buffer persistent with NAME if non-nil."
     58   (if name
     59       (unless (buffer-local-value 'buffer-file-name buffer)
     60         (if-let ((old (get-buffer name)))
     61             (setq buffer (prog1 old (kill-buffer buffer)))
     62           (with-current-buffer buffer
     63             (rename-buffer name))))
     64     (corfu-info--restore-on-next-command))
     65   (setq other-window-scroll-buffer buffer)
     66   (display-buffer buffer t))
     67 
     68 ;;;###autoload
     69 (defun corfu-info-documentation (&optional arg)
     70   "Show documentation of current candidate.
     71 If called with a prefix ARG, the buffer is persistent."
     72   (interactive "P")
     73   ;; Company support, taken from `company.el', see `company-show-doc-buffer'.
     74   (when (< corfu--index 0)
     75     (user-error "No candidate selected"))
     76   (let ((cand (nth corfu--index corfu--candidates)))
     77     (if-let ((extra (nth 4 completion-in-region--data))
     78              (fun (plist-get extra :company-doc-buffer))
     79              (res (funcall fun cand)))
     80         (set-window-start (corfu-info--display-buffer
     81                            (get-buffer (or (car-safe res) res))
     82                            (and arg (format "*corfu doc: %s*" cand)))
     83                           (or (cdr-safe res) (point-min)))
     84       (user-error "No documentation available for `%s'" cand))))
     85 
     86 ;;;###autoload
     87 (defun corfu-info-location (&optional arg)
     88   "Show location of current candidate.
     89 If called with a prefix ARG, the buffer is persistent."
     90   (interactive "P")
     91   ;; Company support, taken from `company.el', see `company-show-location'.
     92   (when (< corfu--index 0)
     93     (user-error "No candidate selected"))
     94   (let ((cand (nth corfu--index corfu--candidates)))
     95     (if-let ((extra (nth 4 completion-in-region--data))
     96              (fun (plist-get extra :company-location))
     97              ;; BUG: company-location may throw errors if location is not found
     98              (loc (ignore-errors (funcall fun cand))))
     99         (with-selected-window
    100             (corfu-info--display-buffer
    101              (or (and (bufferp (car loc)) (car loc))
    102                  (find-file-noselect (car loc) t))
    103              (and arg (format "*corfu loc: %s*" cand)))
    104           (without-restriction
    105             (goto-char (point-min))
    106             (when-let ((pos (cdr loc)))
    107               (if (bufferp (car loc))
    108                   (goto-char pos)
    109                 (forward-line (1- pos))))
    110             (set-window-start nil (point))))
    111       (user-error "No location available for `%s'" cand))))
    112 
    113 ;; Emacs 28: Do not show Corfu commands with M-X
    114 (put #'corfu-info-location 'completion-predicate #'ignore)
    115 (put #'corfu-info-documentation 'completion-predicate #'ignore)
    116 
    117 (provide 'corfu-info)
    118 ;;; corfu-info.el ends here