augroup gzip
 autocmd!
 autocmd BufReadPre,FileReadPre *.gz set bin
 autocmd BufReadPost,FileReadPost   *.gz '[,']!gunzip
 autocmd BufReadPost,FileReadPost   *.gz set nobin
 autocmd BufReadPost,FileReadPost   *.gz execute ":doautocmd BufReadPost " . expand("%:r")
 autocmd BufWritePost,FileWritePost *.gz !mv <afile> <afile>:r
 autocmd BufWritePost,FileWritePost *.gz !gzip <afile>:r
 autocmd FileAppendPre      *.gz !gunzip <afile>
 autocmd FileAppendPre      *.gz !mv <afile>:r <afile>
 autocmd FileAppendPost     *.gz !mv <afile> <afile>:r
 autocmd FileAppendPost     *.gz !gzip <afile>:r
augroup END