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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
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