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446
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1 " Vim autoload file for editing compressed files.
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2 " Maintainer: Bram Moolenaar <Bram@vim.org>
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985
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3 " Last Change: 2006 Oct 03
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446
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4
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5 " These functions are used by the gzip plugin.
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6
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7 " Function to check that executing "cmd [-f]" works.
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8 " The result is cached in s:have_"cmd" for speed.
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9 fun s:check(cmd)
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10 let name = substitute(a:cmd, '\(\S*\).*', '\1', '')
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11 if !exists("s:have_" . name)
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12 let e = executable(name)
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13 if e < 0
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14 let r = system(name . " --version")
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15 let e = (r !~ "not found" && r != "")
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16 endif
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17 exe "let s:have_" . name . "=" . e
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18 endif
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19 exe "return s:have_" . name
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20 endfun
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21
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22 " Set b:gzip_comp_arg to the gzip argument to be used for compression, based on
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23 " the flags in the compressed file.
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24 " The only compression methods that can be detected are max speed (-1) and max
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25 " compression (-9).
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26 fun s:set_compression(line)
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27 " get the Compression Method
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28 let l:cm = char2nr(a:line[2])
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29 " if it's 8 (DEFLATE), we can check for the compression level
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30 if l:cm == 8
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31 " get the eXtra FLags
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32 let l:xfl = char2nr(a:line[8])
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33 " max compression
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34 if l:xfl == 2
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35 let b:gzip_comp_arg = "-9"
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36 " min compression
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37 elseif l:xfl == 4
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38 let b:gzip_comp_arg = "-1"
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39 endif
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40 endif
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41 endfun
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42
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43
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44 " After reading compressed file: Uncompress text in buffer with "cmd"
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45 fun gzip#read(cmd)
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46 " don't do anything if the cmd is not supported
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47 if !s:check(a:cmd)
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48 return
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49 endif
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50
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51 " for gzip check current compression level and set b:gzip_comp_arg.
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52 silent! unlet b:gzip_comp_arg
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53 if a:cmd[0] == 'g'
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54 call s:set_compression(getline(1))
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55 endif
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56
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57 " make 'patchmode' empty, we don't want a copy of the written file
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58 let pm_save = &pm
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59 set pm=
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60 " remove 'a' and 'A' from 'cpo' to avoid the alternate file changes
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61 let cpo_save = &cpo
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62 set cpo-=a cpo-=A
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63 " set 'modifiable'
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64 let ma_save = &ma
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65 setlocal ma
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66 " when filtering the whole buffer, it will become empty
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67 let empty = line("'[") == 1 && line("']") == line("$")
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68 let tmp = tempname()
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69 let tmpe = tmp . "." . expand("<afile>:e")
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70 " write the just read lines to a temp file "'[,']w tmp.gz"
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71 execute "silent '[,']w " . escape(tmpe, ' ')
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446
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72 " uncompress the temp file: call system("gzip -dn tmp.gz")
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73 call system(a:cmd . " " . s:escape(tmpe))
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446
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74 if !filereadable(tmp)
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75 " uncompress didn't work! Keep the compressed file then.
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76 echoerr "Error: Could not read uncompressed file"
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77 return
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78 endif
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79 " delete the compressed lines; remember the line number
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80 let l = line("'[") - 1
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81 if exists(":lockmarks")
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82 lockmarks '[,']d _
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83 else
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84 '[,']d _
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85 endif
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86 " read in the uncompressed lines "'[-1r tmp"
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819
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87 " Use ++edit if the buffer was empty, keep the 'ff' and 'fenc' options.
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446
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88 setlocal nobin
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89 if exists(":lockmarks")
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819
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90 if empty
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91 execute "silent lockmarks " . l . "r ++edit " . tmp
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92 else
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93 execute "silent lockmarks " . l . "r " . tmp
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94 endif
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446
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95 else
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96 execute "silent " . l . "r " . tmp
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97 endif
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98
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99 " if buffer became empty, delete trailing blank line
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100 if empty
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101 silent $delete _
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102 1
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103 endif
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104 " delete the temp file and the used buffers
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105 call delete(tmp)
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106 silent! exe "bwipe " . tmp
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107 silent! exe "bwipe " . tmpe
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108 let &pm = pm_save
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109 let &cpo = cpo_save
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110 let &l:ma = ma_save
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111 " When uncompressed the whole buffer, do autocommands
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112 if empty
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113 if &verbose >= 8
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114 execute "doau BufReadPost " . expand("%:r")
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115 else
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116 execute "silent! doau BufReadPost " . expand("%:r")
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117 endif
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118 endif
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119 endfun
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120
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121 " After writing compressed file: Compress written file with "cmd"
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122 fun gzip#write(cmd)
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123 " don't do anything if the cmd is not supported
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124 if s:check(a:cmd)
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125 " Rename the file before compressing it.
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126 let nm = resolve(expand("<afile>"))
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127 let nmt = s:tempname(nm)
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128 if rename(nm, nmt) == 0
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129 if exists("b:gzip_comp_arg")
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130 call system(a:cmd . " " . b:gzip_comp_arg . " " . s:escape(nmt))
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131 else
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132 call system(a:cmd . " " . s:escape(nmt))
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133 endif
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134 call rename(nmt . "." . expand("<afile>:e"), nm)
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135 endif
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136 endif
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137 endfun
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138
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139 " Before appending to compressed file: Uncompress file with "cmd"
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140 fun gzip#appre(cmd)
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141 " don't do anything if the cmd is not supported
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142 if s:check(a:cmd)
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143 let nm = expand("<afile>")
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144
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145 " for gzip check current compression level and set b:gzip_comp_arg.
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146 silent! unlet b:gzip_comp_arg
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147 if a:cmd[0] == 'g'
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148 call s:set_compression(readfile(nm, "b", 1)[0])
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149 endif
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150
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151 " Rename to a weird name to avoid the risk of overwriting another file
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152 let nmt = expand("<afile>:p:h") . "/X~=@l9q5"
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153 let nmte = nmt . "." . expand("<afile>:e")
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154 if rename(nm, nmte) == 0
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155 if &patchmode != "" && getfsize(nm . &patchmode) == -1
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156 " Create patchmode file by creating the decompressed file new
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157 call system(a:cmd . " -c " . s:escape(nmte) . " > " . s:escape(nmt))
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158 call rename(nmte, nm . &patchmode)
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159 else
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160 call system(a:cmd . " " . s:escape(nmte))
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161 endif
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162 call rename(nmt, nm)
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163 endif
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164 endif
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165 endfun
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166
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167 " find a file name for the file to be compressed. Use "name" without an
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168 " extension if possible. Otherwise use a weird name to avoid overwriting an
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169 " existing file.
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170 fun s:tempname(name)
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171 let fn = fnamemodify(a:name, ":r")
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172 if !filereadable(fn) && !isdirectory(fn)
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173 return fn
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174 endif
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175 return fnamemodify(a:name, ":p:h") . "/X~=@l9q5"
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176 endfun
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177
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178 fun s:escape(name)
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179 " shellescape() was added by patch 7.0.111
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180 if v:version > 700 || (v:version == 700 && has('patch111'))
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181 return shellescape(a:name)
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182 endif
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183 return "'" . a:name . "'"
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184 endfun
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185
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186 " vim: set sw=2 :
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