elisp: Reading a Password
19.9 Reading a Password
=======================
To read a password to pass to another program, you can use the function
‘read-passwd’.
-- Function: read-passwd prompt &optional confirm default
This function reads a password, prompting with PROMPT. It does not
echo the password as the user types it; instead, it echoes ‘.’ for
each character in the password. If you want to apply another
character to hide the password, let-bind the variable
‘read-hide-char’ with that character.
The optional argument CONFIRM, if non-‘nil’, says to read the
password twice and insist it must be the same both times. If it
isn’t the same, the user has to type it over and over until the
last two times match.
The optional argument DEFAULT specifies the default password to
return if the user enters empty input. If DEFAULT is ‘nil’, then
‘read-passwd’ returns the null string in that case.
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