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- " Vim plugin for editing compressed files.
- " Maintainer: Bram Moolenaar <Bram@vim.org>
- " Last Change: 2003 Apr 06
-
- " Exit quickly when:
- " - this plugin was already loaded
- " - when 'compatible' is set
- " - some autocommands are already taking care of compressed files
- if exists("loaded_gzip") || &cp || exists("#BufReadPre#*.gz")
- finish
- endif
- let loaded_gzip = 1
-
- 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
- autocmd BufReadPre,FileReadPre *.gz,*.bz2,*.Z setlocal bin
- autocmd BufReadPost,FileReadPost *.gz call s:read("gzip -d")
- 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 -d")
- 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")
- 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
-
- " 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
- " 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 -d tmp.gz")
- call system(a:cmd . " " . tmpe)
- " delete the compressed lines; remember the line number
- let l = line("'[") - 1
- '[,']d
- " read in the uncompressed lines "'[-1r tmp"
- setlocal nobin
- execute "silent " . l . "r " . tmp
- " 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 = expand("<afile>")
- let nmt = s:tempname(nm)
- if rename(nm, nmt) == 0
- call system(a:cmd . " " . nmt)
- 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)
- " Rename to a weird name to avoid the risk of overwriting another file
- let nm = expand("<afile>")
- 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 :
-