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;;; +compat.el --- Thin backward-compatibility shim -*- lexical-binding: t; -*-
;;; Commentary:
;; I use different versionso of Emacs. Sometimes I have to copy-paste functions
;; from newer Emacs to make my customizations work. This is that file.
;; This is probably ill-advised.
;;; Code:
;;; Load stuff in +compat/ subdirectory
(dolist (file (directory-files (locate-user-emacs-file "lisp/+compat") :full "\\.el\\'"))
(load file :noerror))
;;; Only define things if not already defined
(defmacro +compat-defun (name &rest args)
`(if (fboundp ',name)
(message "+compat: `%s' already bound." ',name)
(defun ,name ,@args)))
(defmacro +compat-defmacro (name &rest args)
`(if (fboundp ',name)
(message "+compat: `%s' already bound." ',name)
(defmacro ,name ,@args)))
;;; Single functions
(+compat-defmacro dlet (binders &rest body)
"Like `let' but using dynamic scoping."
(declare (indent 1) (debug let))
;; (defvar FOO) only affects the current scope, but in order for
;; this not to affect code after the main `let' we need to create a new scope,
;; which is what the surrounding `let' is for.
;; FIXME: (let () ...) currently doesn't actually create a new scope,
;; which is why we use (let (_) ...).
`(let (_)
,@(mapcar (lambda (binder)
`(defvar ,(if (consp binder) (car binder) binder)))
binders)
(let ,binders ,@body)))
;; https://git.savannah.gnu.org/cgit/emacs.git/diff/?id=772b189143453745a8e014e21d4b6b78f855bba3
(+compat-defun rename-visited-file (new-location)
"Rename the file visited by the current buffer to NEW-LOCATION.
This command also sets the visited file name. If the buffer
isn't visiting any file, that's all it does.
Interactively, this prompts for NEW-LOCATION."
(interactive
(list (if buffer-file-name
(read-file-name "Rename visited file to: ")
(read-file-name "Set visited file name: "
default-directory
(expand-file-name
(file-name-nondirectory (buffer-name))
default-directory)))))
(when (and buffer-file-name
(file-exists-p buffer-file-name))
(rename-file buffer-file-name new-location))
(set-visited-file-name new-location nil t))
(provide '+compat)
;;; +compat.el ends here
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