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+;;; compat.el --- Compatibility Library -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2021, 2022 Free Software Foundation, Inc.
+
+;; Author: Philip Kaludercic <philipk@posteo.net>
+;; Maintainer: Compat Development <~pkal/compat-devel@lists.sr.ht>
+;; Version: 28.1.1.0
+;; URL: https://sr.ht/~pkal/compat
+;; Package-Requires: ((emacs "24.3") (nadvice "0.3"))
+;; Keywords: lisp
+
+;; 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:
+
+;; To allow for the usage of Emacs functions and macros that are
+;; defined in newer versions of Emacs, compat.el provides definitions
+;; that are installed ONLY if necessary. These reimplementations of
+;; functions and macros are at least subsets of the actual
+;; implementations. Be sure to read the documentation string to make
+;; sure.
+;;
+;; Not every function provided in newer versions of Emacs is provided
+;; here. Some depend on new features from the core, others cannot be
+;; implemented to a meaningful degree. The main audience for this
+;; library are not regular users, but package maintainers. Therefore
+;; commands and user options are usually not implemented here.
+
+;;; Code:
+
+(eval-when-compile (require 'compat-macs))
+
+;;;; Core functionality
+
+;; To accelerate the loading process, we insert the contents of
+;; compat-N.M.el directly into the compat.elc. Note that by default
+;; this will not include prefix functions. These have to be required
+;; separately, by explicitly requiring the feature that defines them.
+(eval-when-compile
+ (defvar compat--generate-function)
+ (defmacro compat-entwine (version)
+ (cond
+ ((or (not (eq compat--generate-function 'compat--generate-minimal))
+ (bound-and-true-p compat-testing))
+ `(load ,(format "compat-%d.el" version)))
+ ((let* ((compat--generate-function 'compat--generate-minimal-no-prefix)
+ (file (expand-file-name
+ (format "compat-%d.el" version)
+ (file-name-directory
+ (or (if (fboundp 'macroexp-file-name)
+ (macroexp-file-name)
+ (or (bound-and-true-p byte-compile-current-file)
+ load-file-name))
+ (buffer-file-name)))))
+ defs)
+ (with-temp-buffer
+ (insert-file-contents file)
+ (emacs-lisp-mode)
+ (while (progn
+ (forward-comment 1)
+ (not (eobp)))
+ ;; We bind `byte-compile-current-file' before
+ ;; macro-expanding, so that `compat--generate-function'
+ ;; can correctly infer the compatibility version currently
+ ;; being processed.
+ (let ((byte-compile-current-file file)
+ (form (read (current-buffer))))
+ (cond
+ ((memq (car-safe form)
+ '(compat-defun
+ compat-defmacro
+ compat-advise
+ compat-defvar))
+ (push (macroexpand-all form) defs))
+ ((memq (car-safe form)
+ '(declare-function
+ defvar))
+ (push form defs))))))
+ (macroexp-progn (nreverse defs)))))))
+
+(compat-entwine 24)
+(compat-entwine 25)
+(compat-entwine 26)
+(compat-entwine 27)
+(compat-entwine 28)
+
+(provide 'compat)
+;;; compat.el ends here