How do undo for damage done by accidental decipher-mode?
reddit / emacs

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[deleted] · 2022-08-22 14:38

[deleted]

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Illiamen · 2022-08-22 16:24

Try the command `debug-on-entry`.

https://www.gnu.org/software/emacs/manual/html_node/elisp/Debugger.htm
l

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[deleted] · 2022-08-22 16:44

[deleted]

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ieure · 2022-08-22 17:48

You can also hit`C-h v l`, which will display a log of recent
keystrokes and what commands they invoked.

I've never even heard of this mode before, I have no idea how this is
happening.

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7890yuiop · 2022-08-22 22:12

I certainly can't guess how it's getting triggered, but after a brief
look at the code I can tell you that:

* `decipher-mode` is a major mode, and it does indeed kill the undo
list for the buffer (it also makes the buffer read-only), so yeah...
not ideal to *accidentally* invoke that while editing.

* Being a major mode, you should be able to replace it by invoking any
*other* major mode, or by calling `M-x normal-mode`.  It looks like
doing so should re-enable undo (but is not going to restore the
original clobbered undo list).

Also, `(advice-add 'decipher-mode :override #'ignore)` is a good way
to disable a function, as (a) it will survive the original function
getting redefined (if for some strange reason something explicitly
reloaded `decipher.el`), and (b) it's possible to remove the advice to
restore the original function (probably not wanted here, but useful in
the general case).

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Gangsir · 2022-08-23 03:10

Yep. If OP can't figure out what's triggering it via `debug-on-entry`
they could just block it by advicing it to a no-op.

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[deleted] · 2022-08-23 22:36

[deleted]