[PLUG] Have Vim transparently handle encrypted files

[Bill Jonas <bill@billjonas.com>]

You know how if Vim is properly configured it will let you edit gzip'd
and bzip'd files transparently?  Well, Darxus gave me the idea from
talking in #plug about having it handle encrypted files the same way.
So I spent a few minutes hacking up the gzip example that was already
there.  I thought I should share the result.

Here's what I came up with.  Any comments, suggestions?

----Cut here----
if has("autocmd")

" Support editing of gpg-encrypted files
augroup gnupg
  " Remove all gnupg autocommands
  au!

  " Enable editing of gpg-encrypted files
  " Inspired from the gzip section of Debian's /etc/vimrc
  " By Bill Jonas, bill@billjonas.com
  "	  read:	set binary mode before reading the file
  "		decrypt text in buffer after reading
  "	 write:	encrypt file after writing
  "	append:	decrypt file, append, encrypt file
  autocmd BufReadPre,FileReadPre	*.gpg set bin
  autocmd BufReadPre,FileReadPre	*.gpg let ch_save = &ch|set ch=2
  autocmd BufReadPost,FileReadPost	*.gpg '[,']!gpg -d 2>/dev/null
  autocmd BufReadPost,FileReadPost	*.gpg set nobin
  autocmd BufReadPost,FileReadPost	*.gpg let &ch = ch_save|unlet ch_save
  autocmd BufReadPost,FileReadPost	*.gpg execute ":doautocmd BufReadPost " . expand("%:r")

  autocmd BufWritePost,FileWritePost	*.gpg !mv <afile> <afile>:r
  autocmd BufWritePost,FileWritePost	*.gpg !gpg -e <afile>:r

  autocmd FileAppendPre			*.gpg !gpg -d 2>/dev/null <afile>
  autocmd FileAppendPre			*.gpg !mv <afile>:r <afile>
  autocmd FileAppendPost		*.gpg !mv <afile> <afile>:r
  autocmd FileAppendPost		*.gpg !gpg -e <afile>:r

  " Same as above, but for ASCII-armored files
  autocmd BufReadPre,FileReadPre	*.asc set bin
  autocmd BufReadPre,FileReadPre	*.asc let ch_save = &ch|set ch=2
  autocmd BufReadPost,FileReadPost	*.asc '[,']!gpg -d 2>/dev/null
  autocmd BufReadPost,FileReadPost	*.asc set nobin
  autocmd BufReadPost,FileReadPost	*.asc let &ch = ch_save|unlet ch_save
  autocmd BufReadPost,FileReadPost	*.asc execute ":doautocmd BufReadPost " . expand("%:r")

  autocmd BufWritePost,FileWritePost	*.asc !mv <afile> <afile>:r
  autocmd BufWritePost,FileWritePost	*.asc !gpg -a -e <afile>:r

  autocmd FileAppendPre			*.asc !gpg -d 2>/dev/null <afile>
  autocmd FileAppendPre			*.asc !mv <afile>:r <afile>
  autocmd FileAppendPost		*.asc !mv <afile> <afile>:r
  autocmd FileAppendPost		*.asc !gpg -a -e <afile>:r
augroup END
----Cut here----

-- 
Bill Jonas    *    bill@billjonas.com    *    http://www.billjonas.com/
"As we enjoy great advantages from the inventions of others,  we should
be glad of an opportunity to serve others by any invention of ours; and
this we should do freely and generously."          -- Benjamin Franklin


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