我正在尝试创建一个函数,以便从emacs的*Buffer List*
缓冲区中还原缓冲区。据我所知,根据文档,没有一种快速的方法可以做到这一点(就像内置于buff-menu.el
的保存/标记/访问函数那样)。因此,我正在编写一些elisp代码。以下是我的当前尝试:
(defun frobnitz ()
"Call in buffer list to revert buffer at point to file."
(interactive)
(let ((buf (buffer-menu-buffer t)))
(if (y-or-n-p (concat "Revert " (buffer-name (buf)) " ?"))
(with-current-buffer buf
(let (())
(revert-buffer t t t)
(message
(concat "Reverted " (buffer-name (buf)) "to last saved state."))
)))))
很不幸,上面的defun似乎不起作用,我也不知道为什么。如果我评估了上述内容,切换到*Buffer List*
缓冲区,并调用M-: (frobnitz),那么它将出现以下错误。
Debugger entered--Lisp error: (void-function buffer-menu-buffer)
(buffer-menu-buffer t)
(let ((buf (buffer-menu-buffer t))) (if (y-or-n-p (concat "Revert " (buffer-name (buf)) " ?")) (with-current-buffer buf (let (nil) (revert-buffer t t t) (message (concat "Reverted " (buffer-name (buf)) "to last saved state."))))))
frobnitz()
eval((frobnitz) nil)
eval-expression((frobnitz) nil)
call-interactively(eval-expression nil nil)
似乎告诉我找不到函数
buffer-menu-buffer
,但这也似乎过于不太可能,因为buffer-menu-buffer
是使缓冲区菜单正常工作的一个非常核心的函数!出于类似的原因,我非常谨慎地不想自己动buffer-menu-buffer
- 我不想破坏缓冲区菜单。请注意,答案可能是“调用您忽略的此函数”,那么我该如何让这个defun实现其所述目的,即直接从缓冲区菜单还原缓冲区?
更新:正如回答者Sean指出的那样,我遇到困难的函数的正确名称是以大写B开头的
Buffer-menu-buffer
。解决了这个问题后,我又遇到了另一个问题: (let (nil) (revert-buffer t t t) (message (concat "Reverted " buf-name "to last saved state.")))
(save-current-buffer (set-buffer buf) (let (nil) (revert-buffer t t t) (message (concat "Reverted " buf-name "to last saved state."))))
(with-current-buffer buf (let (nil) (revert-buffer t t t) (message (concat "Reverted " buf-name "to last saved state."))))
(if (y-or-n-p (concat "Revert " buf-name " ?")) (with-current-buffer buf (let (nil) (revert-buffer t t t) (message (concat "Reverted " buf-name "to last saved state.")))))
(let ((buf (Buffer-menu-buffer t)) (buf-name (concat "" (buffer-name (Buffer-menu-buffer t))))) (if (y-or-n-p (concat "Revert " buf-name " ?")) (with-current-buffer buf (let (nil) (revert-buffer t t t) (message (concat "Reverted " buf-name "to last saved state."))))))
frobnitz()
eval((frobnitz) nil)
eval-expression((frobnitz) nil)
call-interactively(eval-expression nil nil)
我猜测
with-current-buffer
试图保存当前缓冲区,但在*Buffer List*
上不行。所以现在我正在寻找一种替代方法 - 也许只需要切换、还原并调用(buffer-list)
来切换回来。
更新2:
对于未来的读者:在buffer-menu-mode
中使用的工作函数和单键绑定:
;; Enhance the buffer menu's capabilities.
(defun revert-buffer-from-buffer-list ()
"Call in buffer list to revert buffer at point to file.
Bind this to a key in `buffer-menu-mode' to use it there - not productive in
other modes because it depends on the `Buffer-menu-buffer' function. Undefined
behavior if you invoke it on a buffer not associated with a file: that's why it
has a confirmation gate. Buffers not associated with files get to play by their
own rules when it comes to `revert-buffer' (which see)."
(interactive)
(let (
(buf (Buffer-menu-buffer t))
(buf-name (concat "" (buffer-name(Buffer-menu-buffer t))))
)
(if (y-or-n-p (concat "Revert " buf-name " ?"))
(with-current-buffer buf
(let ()
(revert-buffer t t t)
(message (concat "Reverted " buf-name " to last saved state."))
)))))
(add-hook 'Buffer-menu-mode-hook
(lambda ()
(define-key Buffer-menu-mode-map (kbd "R") revert-buffer-from-buffer-list)
))
此外,提醒注意:
add-hook
不是幂等的,因此如果您向 foo-mode-hook
添加了不想添加或不起作用的内容,则有可能会破坏 foo-mode
直到您清空 foo-mode-hook
或将其中的错误元素修剪掉。问我怎么知道的!
let ()
的问题完全没有在我的视线范围内。感谢您澄清这一点。现在函数已经正确运行,接受。 :) - Brighid McDonnell