58 lines
2.1 KiB
EmacsLisp
58 lines
2.1 KiB
EmacsLisp
;;; compat-help.el --- Documentation for compat functions -*- lexical-binding: t; -*-
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;; Copyright (C) 2022 Free Software Foundation, Inc.
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;; Author: Philip Kaludercic <philipk@posteo.net>
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Load this file to insert `compat'-relevant documentation next to
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;; the regular documentation of a symbol.
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;;; Code:
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(defun compat---describe (symbol)
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"Insert documentation for SYMBOL if it has compatibility code."
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(let ((compat (get symbol 'compat-def)))
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(when compat
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(let ((doc (get compat 'compat-doc))
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(start (point)))
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(when doc
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(insert "There is a ")
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(insert-button
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"compatibility notice"
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'action (let ((type (get compat 'compat-type)))
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(cond
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((memq type '(func macro advice))
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#'find-function)
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((memq type '(variable))
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#'find-variable)
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((error "Unknown type"))))
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'button-data compat)
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(insert (format " for %s (for versions of Emacs before %s):"
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(symbol-name symbol)
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(get compat 'compat-version)))
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(add-text-properties start (point) '(face bold))
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(newline 2)
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(insert (substitute-command-keys doc))
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(fill-region start (point))
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(newline 2))))))
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(add-hook 'help-fns-describe-function-functions #'compat---describe)
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(provide 'compat-help)
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;;; compat-help.el ends here
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