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//usr/share/vim/vim81/autoload/gzip.vim
" Vim autoload file for editing compressed files. " Maintainer: Bram Moolenaar <Bram@vim.org> " Last Change: 2016 Sep 28 " 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 " set 'write' let write_save = &write set write " Reset 'foldenable', otherwise line numbers get adjusted. if has("folding") let fen_save = &fen setlocal nofen endif " when filtering the whole buffer, it will become empty let empty = line("'[") == 1 && line("']") == line("$") let tmp = tempname() let tmpe = tmp . "." . expand("<afile>:e") if exists('*fnameescape') let tmp_esc = fnameescape(tmp) let tmpe_esc = fnameescape(tmpe) else let tmp_esc = escape(tmp, ' ') let tmpe_esc = escape(tmpe, ' ') endif " write the just read lines to a temp file "'[,']w tmp.gz" execute "silent '[,']w " . tmpe_esc " uncompress the temp file: call system("gzip -dn tmp.gz") call system(a:cmd . " " . s:escape(tmpe)) if !filereadable(tmp) " uncompress didn't work! Keep the compressed file then. echoerr "Error: Could not read uncompressed file" let ok = 0 else let ok = 1 " 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" " Use ++edit if the buffer was empty, keep the 'ff' and 'fenc' options. setlocal nobin if exists(":lockmarks") if empty execute "silent lockmarks " . l . "r ++edit " . tmp_esc else execute "silent lockmarks " . l . "r " . tmp_esc endif else execute "silent " . l . "r " . tmp_esc endif " if buffer became empty, delete trailing blank line if empty silent $delete _ 1 endif " delete the temp file and the used buffers call delete(tmp) silent! exe "bwipe " . tmp_esc silent! exe "bwipe " . tmpe_esc endif " Store the OK flag, so that we can use it when writing. let b:uncompressOk = ok " Restore saved option values. let &pm = pm_save let &cpo = cpo_save let &l:ma = ma_save let &write = write_save if has("folding") let &l:fen = fen_save endif " When uncompressed the whole buffer, do autocommands if ok && empty if exists('*fnameescape') let fname = fnameescape(expand("%:r")) else let fname = escape(expand("%:r"), " \t\n*?[{`$\\%#'\"|!<") endif if &verbose >= 8 execute "doau BufReadPost " . fname else execute "silent! doau BufReadPost " . fname endif endif endfun " After writing compressed file: Compress written file with "cmd" fun gzip#write(cmd) if exists('b:uncompressOk') && !b:uncompressOk echomsg "Not compressing file because uncompress failed; reset b:uncompressOk to compress anyway" " don't do anything if the cmd is not supported elseif 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 . " -- " . s:escape(nmt)) else call system(a:cmd . " -- " . s:escape(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 -- " . s:escape(nmte) . " > " . s:escape(nmt)) call rename(nmte, nm . &patchmode) else call system(a:cmd . " -- " . s:escape(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 fun s:escape(name) " shellescape() was added by patch 7.0.111 if exists("*shellescape") return shellescape(a:name) endif return "'" . a:name . "'" endfun " vim: set sw=2 :