Support GPG encrypting and signing

Feature request: extend the GPG support to include signing and encrypting, as well as the current decrypting/verification.

This would be a convenience function that structures the email correctly per convention, and encrypts / signs the body and attachments (and not the header).

Hi,

Here's a horrible, horrible hack -- when I started this, I didn't know how to declare functions in vim, so this will probably break your computer. It does not encrypt attachments; it does not handle multiple To: recipients; it does not handle CC: or BCC: recipients. If you even put more than one person in the To: it'll probably croak. If you have a really unique email address, it'll fail. In fact, there are probably more fail cases than there are success cases, and you should probably stop reading and go have a soda and read some Calvin and Hobbes. It could do all of these things, but as I said, it's a hack, suitable only for desperate people.

What it does do (when it works) is grab the To: and From: addresses, and encrypt everything after the Attach: line with those two keys. It then replaces the body with the ASCII armored result. It also signs, because why not. The snippet below binds the function to e.

I have this at the end of my .config/nvim/init.vim file; you could have it in your .vimrc. I tried sticking it in notmuch.vim and lost interest when I hit my first error. As I said, desperate ugly solution for desperate (but beautiful) people.

" Encryption for NotMuch
function! ComposeEncrypt()
        let l:email = '[A-Za-z0-9._%+-]\+@[A-Za-z0-9.-]\+\.[A-Za-z]\+'
        norm 1G
        norm /^From:/
        let l:from = matchstr(getline('.'), l:email)
        norm /^To:/
        let l:to = matchstr(getline('.'), l:email)
        let l:command = "gpg -ase --recipient " . l:from . " --recipient " . l:to . " --trust-model always"
        norm /^Attach:/
        norm j
        norm ma
        exec '.,$yank a'
        let @x = system(l:command, @a)
        norm 'a
        normal VGd
        normal "xp
        normal :g/^gpg: /d
endfunction
map <Leader>e :call ComposeEncrypt()<CR>