我编写了这个小小的次要模式，以便在主要模式执行了初始缩进行为后获得TAB键继续缩进，和/或在主要模式认为不需要缩进时强制缩进。
已经向我指出，可以将setq和make-local-variable的组合简化为let范围。鉴于这需要同时跨多个缓冲区工作，如何将其更改为使用let而不是make-local-variable？
;;; dwim-tab.el --- minor mode to force indentation when TAB would otherwise stall
; internal tracking variables
(setq dwim-tab-point-before nil)
(setq dwim-tab-point-after nil)
(defun dwim-tab ()
"Indents normally once, then switches to tab-to-tab-stop if invoked again.
Always performs tab-to-tab-stop if the first TAB press does not cause the
point to move."
(interactive)
(setq dwim-tab-point-before (point))
(if (eq dwim-tab-point-before dwim-tab-point-after) ; pressed TAB again
(tab-to-tab-stop)
(indent-for-tab-command))
(if (eq (point) dwim-tab-point-before) ; point didn't move
(tab-to-tab-stop))
(setq dwim-tab-point-after (point)))
(define-minor-mode dwim-tab-mode
"Toggle dwim-tab-mode.
With a non-nil argument, turns on dwim-tab-mode. With a nil argument, turns it
off.
When dwim-tab-mode is enabled, pressing the TAB key once will behave as normal,
but pressing it subsequent times, will continue to indent, using
tab-to-tab-stop.
If dwim-tab determines that the first TAB key press resulted in no movement of
the point, it will indent according to tab-to-tab-stop instead."
:init-value nil
:lighter " DWIM"
:keymap '(("\t" . dwim-tab))
(make-local-variable 'dwim-tab-point-before)
(make-local-variable 'dwim-tab-point-after))
(provide 'dwim-tab)
最佳答案
这是您想要的吗？看，没有变数!
(defun tab-dwim ()
(interactive)
(when (or (eq last-command this-command)
(= (point) (progn
(indent-for-tab-command)
(point))))
(tab-to-tab-stop)))
假设
indent-for-tab-command不会神奇地再次缩进，那么最后一个命令的检查不是绝对必要的。但这会稍微提高CPU效率。