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Re: password.el: A minor mode to hide sensitive information (passwords)

From: Jürgen Hötzel
Subject: Re: password.el: A minor mode to hide sensitive information (passwords) using overlays.
Date: Wed, 21 Nov 2012 16:59:27 +0100

Hi Michael,

2012/11/21 Michael Albinus <>:
> Jürgen Hötzel <> writes:
>> Hi Michael,
> Hi Jürgen,
>> I introduced a new custom variable password-mode-password-prefix-regexs:
>> So you can change this.
> That looks much better now. Maybe you could polish a little bit the
> default. I would make the colon optional, then .netrc or .authinfo files
> are supported out of the box. And maybe you shall allow any space class
> characters after the prefix. My proposal for a default value would be
>   '("Password:?[[:space:]]+" "Passwort:?[[:space:]]+")

Thanks. That makes sense: Done.

> You might also mention in the docstring of that custom option, that the
> regexps must not contain parentheses for grouping, otherwise your match
> wouldn't work. Shy groups are OK.

Thanks. Also done.
> Another minor annoyance is, that your code is activated only in case of
> *inserting* a character. I have no simple solution at hand, because
> there isn't a hook when deleting a character. Maybe you could remap keys
> <delete-char> and <backspace> for the password string region, but I
> don't know whether this covers all use cases.
> Delete/undo is also problematic, because you don't know first hand which
> password to enter as confirmation.
> An alternative approach could be to mark the region which contains the
> password with the `read-only' property and catch the `text-read-only'
> error, which is raised when somebody tries to modify this region. In the
> error handler, you could call your password change mechanery.

Yes, there is no easy solution. I implemented it using the overlay insert hook,
because i can easily distinguish my overlays from other overlays and
don't wanted
to fiddle with user key bindings which may be already customized.

I did not knew about the 'read-only'  option: Thanks. I will check it out!


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