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+;;; compat-help.el --- Documentation for compat functions -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022 Free Software Foundation, Inc.
+
+;; Author: Philip Kaludercic <philipk@posteo.net>
+
+;; 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Load this file to insert `compat'-relevant documentation next to
+;; the regular documentation of a symbol.
+
+;;; Code:
+
+(defun compat---describe (symbol)
+ "Insert documentation for SYMBOL if it has compatibility code."
+ (let ((compat (get symbol 'compat-def)))
+ (when compat
+ (let ((doc (get compat 'compat-doc))
+ (start (point)))
+ (when doc
+ (insert "There is a ")
+ (insert-button
+ "compatibility notice"
+ 'action (let ((type (get compat 'compat-type)))
+ (cond
+ ((memq type '(func macro advice))
+ #'find-function)
+ ((memq type '(variable))
+ #'find-variable)
+ ((error "Unknown type"))))
+ 'button-data compat)
+ (insert (format " for %s (for versions of Emacs before %s):"
+ (symbol-name symbol)
+ (get compat 'compat-version)))
+ (add-text-properties start (point) '(face bold))
+ (newline 2)
+ (insert (substitute-command-keys doc))
+ (fill-region start (point))
+ (newline 2))))))
+
+(add-hook 'help-fns-describe-function-functions #'compat---describe)
+
+(provide 'compat-help)
+;;; compat-help.el ends here