elisp - Emacs minor mode programming: cancel toggle-off procedure? -


i programming own emacs minor mode using idioms , macros similar minimal example:

(define-minor-mode foo-mode   "toggle foo mode."   :init-value nil   :lighter " foo"   :group 'foo   (if foo-mode       (do-enable-foo)     (do-disable-foo))   )  (defun do-enable-foo ()   "enable foo minor mode"   (message "enabling foo...")   (if test-something       (message "foo enabled after disabling canceled!")     (message "foo enabled scratch"))   )  (defun do-disable-foo ()   "disable foo minor mode"   (message "disabling foo...")   (if (not certain-situation)       (message "... done.") ; finish disabling foo     ;; else forms:     (message "need cancel disabling foo!")     (foo-mode 1)) ; turning foo mode on again   )

during toggling off of minor mode, 'certain-situation may arise when have cancel toggling off. currently, thinking since using define-minor-mode macro, cannot bail out have programmatically turn mode on again using (foo-mode 1) seen in code.

if go route, have handle differently in enabling function do-enable-foo -- first question how detect case using placeholder 'test-something in code above?

or, there cleaner way achieve cancel, example, signaling error instead of (foo-mode 1) prevent mode toggle going through?

if want cancel "turn off", rather call (foo-mode 1), can (setq foo-mode t).

if reason want call (foo-mode 1) recursively (re)enable mode, can in following way:

(defvar foo-mode--reenabling nil) .... (defun do-enable-foo ()   (if foo-mode--reenabling       ...     ...)) ... (defun do-disable-foo ()   ...   (let ((foo-mode--reenabling t))     (foo-mode 1)))

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