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| | ;;; shorthands.el --- Read code considering Elisp shorthands -*- lexical-binding: t; -*-
;; Copyright (C) 2021 Free Software Foundation, Inc.
;; Author: João Távora <joaotavora@gmail.com>
;; Keywords: lisp
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Basic helpers for loading files with Shorthands.
;;; Code:
(require 'files)
(defun hack-elisp-shorthands (fullname)
"Return value of `elisp-shorthands' file-local variable in FULLNAME.
FULLNAME is the absolute file name of an Elisp .el file which
potentially specifies a file-local value for `elisp-shorthands'.
The Elisp code in FULLNAME isn't read or evaluated in any way,
except for extraction of the buffer-local value of
`elisp-shorthands'."
(let* ((size (nth 7 (file-attributes fullname)))
(from (max 0 (- size 3000)))
(to size))
(with-temp-buffer
(while (and (< (buffer-size) 3000) (>= from 0))
(insert-file-contents fullname nil from to)
(setq to from from (- from 100)))
;; FIXME: relies on the `hack-local-variables--find-variables'
;; detail of files.el. That function should be exported,
;; possibly be refactored into two parts, since we're only
;; interested in basic "Local Variables" parsing.
(alist-get 'elisp-shorthands (hack-local-variables--find-variables)))))
(defun load-with-shorthands-and-code-conversion (fullname file noerror nomessage)
"Like `load-with-code-conversion', but also consider Elisp shorthands.
This function uses shorthands defined in the file FULLNAME's local
value of `elisp-shorthands', when it processes that file's Elisp code."
(let ((elisp-shorthands (hack-elisp-shorthands fullname)))
(load-with-code-conversion fullname file noerror nomessage)))
;;; shorthands.el ends here
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