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7
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1 " Vim plugin for editing compressed files.
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2 " Maintainer: Bram Moolenaar <Bram@vim.org>
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271
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3 " Last Change: 2005 May 18
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7
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4
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5 " Exit quickly when:
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6 " - this plugin was already loaded
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7 " - when 'compatible' is set
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8 " - some autocommands are already taking care of compressed files
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9 if exists("loaded_gzip") || &cp || exists("#BufReadPre#*.gz")
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10 finish
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11 endif
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12 let loaded_gzip = 1
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13
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14 augroup gzip
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15 " Remove all gzip autocommands
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16 au!
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17
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18 " Enable editing of gzipped files
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19 " set binary mode before reading the file
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20 " use "gzip -d", gunzip isn't always available
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21 autocmd BufReadPre,FileReadPre *.gz,*.bz2,*.Z setlocal bin
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22 autocmd BufReadPost,FileReadPost *.gz call s:read("gzip -dn")
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23 autocmd BufReadPost,FileReadPost *.bz2 call s:read("bzip2 -d")
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24 autocmd BufReadPost,FileReadPost *.Z call s:read("uncompress")
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25 autocmd BufWritePost,FileWritePost *.gz call s:write("gzip")
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26 autocmd BufWritePost,FileWritePost *.bz2 call s:write("bzip2")
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27 autocmd BufWritePost,FileWritePost *.Z call s:write("compress -f")
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28 autocmd FileAppendPre *.gz call s:appre("gzip -dn")
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29 autocmd FileAppendPre *.bz2 call s:appre("bzip2 -d")
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30 autocmd FileAppendPre *.Z call s:appre("uncompress")
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31 autocmd FileAppendPost *.gz call s:write("gzip")
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32 autocmd FileAppendPost *.bz2 call s:write("bzip2")
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33 autocmd FileAppendPost *.Z call s:write("compress -f")
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34 augroup END
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35
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36 " Function to check that executing "cmd [-f]" works.
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37 " The result is cached in s:have_"cmd" for speed.
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38 fun s:check(cmd)
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39 let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
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40 if !exists("s:have_" . name)
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41 let e = executable(name)
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42 if e < 0
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43 let r = system(name . " --version")
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44 let e = (r !~ "not found" && r != "")
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45 endif
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46 exe "let s:have_" . name . "=" . e
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47 endif
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48 exe "return s:have_" . name
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49 endfun
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50
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271
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51 " Set b:gzip_comp_arg to the gzip argument to be used for compression, based on
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52 " the flags in the compressed file.
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53 " The only compression methods that can be detected are max speed (-1) and max
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54 " compression (-9).
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55 fun s:set_compression(line)
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56 " get the Compression Method
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57 let l:cm = char2nr(a:line[2])
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58 " if it's 8 (DEFLATE), we can check for the compression level
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59 if l:cm == 8
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60 " get the eXtra FLags
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61 let l:xfl = char2nr(a:line[8])
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62 " max compression
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63 if l:xfl == 2
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64 let b:gzip_comp_arg = "-9"
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65 " min compression
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66 elseif l:xfl == 4
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67 let b:gzip_comp_arg = "-1"
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68 endif
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69 endif
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70 endfun
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71
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72
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7
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73 " After reading compressed file: Uncompress text in buffer with "cmd"
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74 fun s:read(cmd)
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75 " don't do anything if the cmd is not supported
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76 if !s:check(a:cmd)
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77 return
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78 endif
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271
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79
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80 " for gzip check current compression level and set b:gzip_comp_arg.
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81 silent! unlet b:gzip_comp_arg
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82 if a:cmd[0] == 'g'
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83 call s:set_compression(getline(1))
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84 endif
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85
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7
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86 " make 'patchmode' empty, we don't want a copy of the written file
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87 let pm_save = &pm
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88 set pm=
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89 " remove 'a' and 'A' from 'cpo' to avoid the alternate file changes
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90 let cpo_save = &cpo
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91 set cpo-=a cpo-=A
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92 " set 'modifiable'
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93 let ma_save = &ma
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94 setlocal ma
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95 " when filtering the whole buffer, it will become empty
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96 let empty = line("'[") == 1 && line("']") == line("$")
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97 let tmp = tempname()
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98 let tmpe = tmp . "." . expand("<afile>:e")
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99 " write the just read lines to a temp file "'[,']w tmp.gz"
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100 execute "silent '[,']w " . tmpe
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101 " uncompress the temp file: call system("gzip -dn tmp.gz")
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102 call system(a:cmd . " " . tmpe)
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22
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103 if !filereadable(tmp)
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104 " uncompress didn't work! Keep the compressed file then.
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105 echoerr "Error: Could not read uncompressed file"
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106 return
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107 endif
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7
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108 " delete the compressed lines; remember the line number
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109 let l = line("'[") - 1
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110 if exists(":lockmarks")
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111 lockmarks '[,']d _
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112 else
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113 '[,']d _
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114 endif
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115 " read in the uncompressed lines "'[-1r tmp"
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116 setlocal nobin
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117 if exists(":lockmarks")
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118 execute "silent lockmarks " . l . "r " . tmp
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119 else
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120 execute "silent " . l . "r " . tmp
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121 endif
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122
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123 " if buffer became empty, delete trailing blank line
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124 if empty
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125 silent $delete _
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126 1
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127 endif
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128 " delete the temp file and the used buffers
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129 call delete(tmp)
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130 silent! exe "bwipe " . tmp
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131 silent! exe "bwipe " . tmpe
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132 let &pm = pm_save
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133 let &cpo = cpo_save
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134 let &l:ma = ma_save
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135 " When uncompressed the whole buffer, do autocommands
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136 if empty
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137 if &verbose >= 8
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138 execute "doau BufReadPost " . expand("%:r")
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139 else
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140 execute "silent! doau BufReadPost " . expand("%:r")
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141 endif
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142 endif
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143 endfun
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144
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145 " After writing compressed file: Compress written file with "cmd"
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146 fun s:write(cmd)
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147 " don't do anything if the cmd is not supported
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148 if s:check(a:cmd)
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149 " Rename the file before compressing it.
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231
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150 let nm = resolve(expand("<afile>"))
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7
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151 let nmt = s:tempname(nm)
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152 if rename(nm, nmt) == 0
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271
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153 if exists("b:gzip_comp_arg")
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154 call system(a:cmd . " " . b:gzip_comp_arg . " " . nmt)
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155 else
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156 call system(a:cmd . " " . nmt)
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157 endif
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7
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158 call rename(nmt . "." . expand("<afile>:e"), nm)
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159 endif
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160 endif
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161 endfun
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162
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163 " Before appending to compressed file: Uncompress file with "cmd"
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164 fun s:appre(cmd)
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165 " don't do anything if the cmd is not supported
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166 if s:check(a:cmd)
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271
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167 let nm = expand("<afile>")
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168
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169 " for gzip check current compression level and set b:gzip_comp_arg.
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170 silent! unlet b:gzip_comp_arg
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171 if a:cmd[0] == 'g'
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172 call s:set_compression(readfile(nm, "b", 1)[0])
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173 endif
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174
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7
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175 " Rename to a weird name to avoid the risk of overwriting another file
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176 let nmt = expand("<afile>:p:h") . "/X~=@l9q5"
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177 let nmte = nmt . "." . expand("<afile>:e")
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178 if rename(nm, nmte) == 0
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179 if &patchmode != "" && getfsize(nm . &patchmode) == -1
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180 " Create patchmode file by creating the decompressed file new
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181 call system(a:cmd . " -c " . nmte . " > " . nmt)
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182 call rename(nmte, nm . &patchmode)
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183 else
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184 call system(a:cmd . " " . nmte)
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185 endif
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186 call rename(nmt, nm)
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187 endif
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188 endif
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189 endfun
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190
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191 " find a file name for the file to be compressed. Use "name" without an
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192 " extension if possible. Otherwise use a weird name to avoid overwriting an
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193 " existing file.
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194 fun s:tempname(name)
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195 let fn = fnamemodify(a:name, ":r")
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196 if !filereadable(fn) && !isdirectory(fn)
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197 return fn
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198 endif
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199 return fnamemodify(a:name, ":p:h") . "/X~=@l9q5"
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200 endfun
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201
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202 " vim: set sw=2 :
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