Commands with passwords as options

[Julien Nicoulaud <julien.nicoulaud@xxxxxxxxx>]

Some commands take passwords as option values, which is not very secure... I
was wondering if there is some way to handle that, for example through a
custom completer. Ideally, I here is how it should behave:
 - When reaching an option which expected value is a password, prompt for it
and read it from stdin
 - Do not display it in the buffer (just replace it with "XXXX" for example)
 - When accepting the buffer, replace the displayed buffer with the real one
 - Save the displayed buffer in the history rather than the real one

Does anyone have an idea on how to achieve this ?

Regards,
Julien