--- a/runtime/plugin/gzip.vim
+++ b/runtime/plugin/gzip.vim
@@ -1,6 +1,6 @@
 " Vim plugin for editing compressed files.
 " Maintainer: Bram Moolenaar <Bram@vim.org>
-" Last Change: 2005 May 18
+" Last Change: 2005 Jul 26
 
 " Exit quickly when:
 " - this plugin was already loaded
@@ -15,188 +15,22 @@ augroup gzip
   " Remove all gzip autocommands
   au!
 
-  " Enable editing of gzipped files
-  " set binary mode before reading the file
-  " use "gzip -d", gunzip isn't always available
+  " Enable editing of gzipped files.
+  " The functions are defined in autoload/gzip.vim.
+  "
+  " Set binary mode before reading the file.
+  " Use "gzip -d", gunzip isn't always available.
   autocmd BufReadPre,FileReadPre	*.gz,*.bz2,*.Z setlocal bin
-  autocmd BufReadPost,FileReadPost	*.gz  call s:read("gzip -dn")
-  autocmd BufReadPost,FileReadPost	*.bz2 call s:read("bzip2 -d")
-  autocmd BufReadPost,FileReadPost	*.Z   call s:read("uncompress")
-  autocmd BufWritePost,FileWritePost	*.gz  call s:write("gzip")
-  autocmd BufWritePost,FileWritePost	*.bz2 call s:write("bzip2")
-  autocmd BufWritePost,FileWritePost	*.Z   call s:write("compress -f")
-  autocmd FileAppendPre			*.gz  call s:appre("gzip -dn")
-  autocmd FileAppendPre			*.bz2 call s:appre("bzip2 -d")
-  autocmd FileAppendPre			*.Z   call s:appre("uncompress")
-  autocmd FileAppendPost		*.gz  call s:write("gzip")
-  autocmd FileAppendPost		*.bz2 call s:write("bzip2")
-  autocmd FileAppendPost		*.Z   call s:write("compress -f")
+  autocmd BufReadPost,FileReadPost	*.gz  call gzip#read("gzip -dn")
+  autocmd BufReadPost,FileReadPost	*.bz2 call gzip#read("bzip2 -d")
+  autocmd BufReadPost,FileReadPost	*.Z   call gzip#read("uncompress")
+  autocmd BufWritePost,FileWritePost	*.gz  call gzip#write("gzip")
+  autocmd BufWritePost,FileWritePost	*.bz2 call gzip#write("bzip2")
+  autocmd BufWritePost,FileWritePost	*.Z   call gzip#write("compress -f")
+  autocmd FileAppendPre			*.gz  call gzip#appre("gzip -dn")
+  autocmd FileAppendPre			*.bz2 call gzip#appre("bzip2 -d")
+  autocmd FileAppendPre			*.Z   call gzip#appre("uncompress")
+  autocmd FileAppendPost		*.gz  call gzip#write("gzip")
+  autocmd FileAppendPost		*.bz2 call gzip#write("bzip2")
+  autocmd FileAppendPost		*.Z   call gzip#write("compress -f")
 augroup END
-
-" Function to check that executing "cmd [-f]" works.
-" The result is cached in s:have_"cmd" for speed.
-fun s:check(cmd)
-  let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
-  if !exists("s:have_" . name)
-    let e = executable(name)
-    if e < 0
-      let r = system(name . " --version")
-      let e = (r !~ "not found" && r != "")
-    endif
-    exe "let s:have_" . name . "=" . e
-  endif
-  exe "return s:have_" . name
-endfun
-
-" Set b:gzip_comp_arg to the gzip argument to be used for compression, based on
-" the flags in the compressed file.
-" The only compression methods that can be detected are max speed (-1) and max
-" compression (-9).
-fun s:set_compression(line)
-  " get the Compression Method
-  let l:cm = char2nr(a:line[2])
-  " if it's 8 (DEFLATE), we can check for the compression level
-  if l:cm == 8
-    " get the eXtra FLags
-    let l:xfl = char2nr(a:line[8])
-    " max compression
-    if l:xfl == 2
-      let b:gzip_comp_arg = "-9"
-    " min compression
-    elseif l:xfl == 4
-      let b:gzip_comp_arg = "-1"
-    endif
-  endif
-endfun
-
-
-" After reading compressed file: Uncompress text in buffer with "cmd"
-fun s:read(cmd)
-  " don't do anything if the cmd is not supported
-  if !s:check(a:cmd)
-    return
-  endif
-
-  " for gzip check current compression level and set b:gzip_comp_arg.
-  silent! unlet b:gzip_comp_arg
-  if a:cmd[0] == 'g'
-    call s:set_compression(getline(1))
-  endif
-
-  " make 'patchmode' empty, we don't want a copy of the written file
-  let pm_save = &pm
-  set pm=
-  " remove 'a' and 'A' from 'cpo' to avoid the alternate file changes
-  let cpo_save = &cpo
-  set cpo-=a cpo-=A
-  " set 'modifiable'
-  let ma_save = &ma
-  setlocal ma
-  " when filtering the whole buffer, it will become empty
-  let empty = line("'[") == 1 && line("']") == line("$")
-  let tmp = tempname()
-  let tmpe = tmp . "." . expand("<afile>:e")
-  " write the just read lines to a temp file "'[,']w tmp.gz"
-  execute "silent '[,']w " . tmpe
-  " uncompress the temp file: call system("gzip -dn tmp.gz")
-  call system(a:cmd . " " . tmpe)
-  if !filereadable(tmp)
-    " uncompress didn't work!  Keep the compressed file then.
-    echoerr "Error: Could not read uncompressed file"
-    return
-  endif
-  " delete the compressed lines; remember the line number
-  let l = line("'[") - 1
-  if exists(":lockmarks")
-    lockmarks '[,']d _
-  else
-    '[,']d _
-  endif
-  " read in the uncompressed lines "'[-1r tmp"
-  setlocal nobin
-  if exists(":lockmarks")
-    execute "silent lockmarks " . l . "r " . tmp
-  else
-    execute "silent " . l . "r " . tmp
-  endif
-
-  " if buffer became empty, delete trailing blank line
-  if empty
-    silent $delete _
-    1
-  endif
-  " delete the temp file and the used buffers
-  call delete(tmp)
-  silent! exe "bwipe " . tmp
-  silent! exe "bwipe " . tmpe
-  let &pm = pm_save
-  let &cpo = cpo_save
-  let &l:ma = ma_save
-  " When uncompressed the whole buffer, do autocommands
-  if empty
-    if &verbose >= 8
-      execute "doau BufReadPost " . expand("%:r")
-    else
-      execute "silent! doau BufReadPost " . expand("%:r")
-    endif
-  endif
-endfun
-
-" After writing compressed file: Compress written file with "cmd"
-fun s:write(cmd)
-  " don't do anything if the cmd is not supported
-  if s:check(a:cmd)
-    " Rename the file before compressing it.
-    let nm = resolve(expand("<afile>"))
-    let nmt = s:tempname(nm)
-    if rename(nm, nmt) == 0
-      if exists("b:gzip_comp_arg")
-	call system(a:cmd . " " . b:gzip_comp_arg . " " . nmt)
-      else
-	call system(a:cmd . " " . nmt)
-      endif
-      call rename(nmt . "." . expand("<afile>:e"), nm)
-    endif
-  endif
-endfun
-
-" Before appending to compressed file: Uncompress file with "cmd"
-fun s:appre(cmd)
-  " don't do anything if the cmd is not supported
-  if s:check(a:cmd)
-    let nm = expand("<afile>")
-
-    " for gzip check current compression level and set b:gzip_comp_arg.
-    silent! unlet b:gzip_comp_arg
-    if a:cmd[0] == 'g'
-      call s:set_compression(readfile(nm, "b", 1)[0])
-    endif
-
-    " Rename to a weird name to avoid the risk of overwriting another file
-    let nmt = expand("<afile>:p:h") . "/X~=@l9q5"
-    let nmte = nmt . "." . expand("<afile>:e")
-    if rename(nm, nmte) == 0
-      if &patchmode != "" && getfsize(nm . &patchmode) == -1
-	" Create patchmode file by creating the decompressed file new
-	call system(a:cmd . " -c " . nmte . " > " . nmt)
-	call rename(nmte, nm . &patchmode)
-      else
-	call system(a:cmd . " " . nmte)
-      endif
-      call rename(nmt, nm)
-    endif
-  endif
-endfun
-
-" find a file name for the file to be compressed.  Use "name" without an
-" extension if possible.  Otherwise use a weird name to avoid overwriting an
-" existing file.
-fun s:tempname(name)
-  let fn = fnamemodify(a:name, ":r")
-  if !filereadable(fn) && !isdirectory(fn)
-    return fn
-  endif
-  return fnamemodify(a:name, ":p:h") . "/X~=@l9q5"
-endfun
-
-" vim: set sw=2 :