/usr/share/vim/vim80/ftplugin/mail.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | " Vim filetype plugin file
" Language: Mail
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2012 Nov 20
" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
finish
endif
let b:did_ftplugin = 1
let b:undo_ftplugin = "setl modeline< tw< fo< comments<"
" Don't use modelines in e-mail messages, avoid trojan horses and nasty
" "jokes" (e.g., setting 'textwidth' to 5).
setlocal nomodeline
" many people recommend keeping e-mail messages 72 chars wide
if &tw == 0
setlocal tw=72
endif
" Set 'formatoptions' to break text lines and keep the comment leader ">".
setlocal fo+=tcql
" Add n:> to 'comments, in case it was removed elsewhere
setlocal comments+=n:>
" Add mappings, unless the user doesn't want this.
if !exists("no_plugin_maps") && !exists("no_mail_maps")
" Quote text by inserting "> "
if !hasmapto('<Plug>MailQuote')
vmap <buffer> <LocalLeader>q <Plug>MailQuote
nmap <buffer> <LocalLeader>q <Plug>MailQuote
endif
vnoremap <buffer> <Plug>MailQuote :s/^/> /<CR>:noh<CR>``
nnoremap <buffer> <Plug>MailQuote :.,$s/^/> /<CR>:noh<CR>``
endif
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