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Per debugging from Enno Nagel <enno.nagel+vim@gmail.com>, it's become
apparent to me that to have any degree of confidence that none of these
options have actually got any plaintext password data in them, we need
to disable the options globally when a password file is edited.
In particular, in the case of the 'viminfo' global option, it's not
possible to disable it per path, and not terribly meaningful either;
things like the last seach pattern or the contents of registers, i.e.
global state of the editor, are recorded. There's no sensible approach I
can see except to actually switch the feature off entirely by blanking
it.
I've therefore completely rewritten this, to make as thorough a check as
possible that the Vim user is editing a pass(1) file by calling `pass
edit`, and then to disable the "leaky" options globally, with an
explicit warning so that the user can see it's been done.
This plugin is also available as Vim script #5707:
<https://www.vim.org/scripts/script.php?script_id=5707>
Its homepage is here:
<https://sanctum.geek.nz/cgit/vim-redact-pass.git/about/>
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