[MacPorts] #37727: vim, vim-app, MacVim: Don't write backup for crontab or chpass

[MacPorts]

#37727: vim, vim-app, MacVim: Don't write backup for crontab or chpass
----------------------+--------------------------------
 Reporter:  raimue@…  |      Owner:  raimue@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.1.2
 Keywords:            |       Port:  vim vim-app MacVim
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 The current vim configuration does not support `EDITOR=${prefix}/bin/vim
 crontab -e` or `EDITOR=${prefix}/bin/vim chpass` as the file is deleted
 and rewritten while crontab watches the file descriptor for changes.

 The equivalent of `/usr/share/vim/vimrc` needs to be applied:
 {{{
 " Don't write backup file if vim is being called by "crontab -e"
 au BufWrite /private/tmp/crontab.* set nowritebackup
 " Don't write backup file if vim is being called by "chpass"
 au BufWrite /private/etc/pw.* set nowritebackup
 }}}

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Ticket URL: <https://trac.macports.org/ticket/37727>
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