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" Vim autoload file for editing compressed files.
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2005 Jul 26
" These functions are used by the gzip plugin.
" 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 gzip#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 gzip#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 gzip#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 :
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