Add corfu-history and corfu-info extensionsextensions

1 files changed, 95 insertions, 0 deletions

diff --git a/extensions/corfu-info.el b/extensions/corfu-info.el
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+++ b/extensions/corfu-info.el
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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: 2021
+;; Version: 0.1
+;; Package-Requires: ((emacs "27.1") (corfu "0.20"))
+;; 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.
+
+;;; 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