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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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3 " Last Change: 2005 Jul 26
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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 " . tmpe
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72 " uncompress the temp file: call system("gzip -dn tmp.gz")
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73 call system(a:cmd . " " . tmpe)
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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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87 setlocal nobin
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88 if exists(":lockmarks")
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89 execute "silent lockmarks " . l . "r " . tmp
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90 else
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91 execute "silent " . l . "r " . tmp
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92 endif
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93
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94 " if buffer became empty, delete trailing blank line
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95 if empty
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96 silent $delete _
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97 1
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98 endif
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99 " delete the temp file and the used buffers
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100 call delete(tmp)
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101 silent! exe "bwipe " . tmp
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102 silent! exe "bwipe " . tmpe
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103 let &pm = pm_save
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104 let &cpo = cpo_save
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105 let &l:ma = ma_save
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106 " When uncompressed the whole buffer, do autocommands
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107 if empty
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108 if &verbose >= 8
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109 execute "doau BufReadPost " . expand("%:r")
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110 else
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111 execute "silent! doau BufReadPost " . expand("%:r")
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112 endif
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113 endif
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114 endfun
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115
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116 " After writing compressed file: Compress written file with "cmd"
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117 fun gzip#write(cmd)
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118 " don't do anything if the cmd is not supported
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119 if s:check(a:cmd)
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120 " Rename the file before compressing it.
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121 let nm = resolve(expand("<afile>"))
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122 let nmt = s:tempname(nm)
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123 if rename(nm, nmt) == 0
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124 if exists("b:gzip_comp_arg")
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125 call system(a:cmd . " " . b:gzip_comp_arg . " " . nmt)
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126 else
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127 call system(a:cmd . " " . nmt)
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128 endif
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129 call rename(nmt . "." . expand("<afile>:e"), nm)
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130 endif
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131 endif
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132 endfun
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133
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134 " Before appending to compressed file: Uncompress file with "cmd"
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135 fun gzip#appre(cmd)
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136 " don't do anything if the cmd is not supported
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137 if s:check(a:cmd)
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138 let nm = expand("<afile>")
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139
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140 " for gzip check current compression level and set b:gzip_comp_arg.
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141 silent! unlet b:gzip_comp_arg
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142 if a:cmd[0] == 'g'
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143 call s:set_compression(readfile(nm, "b", 1)[0])
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144 endif
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145
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146 " Rename to a weird name to avoid the risk of overwriting another file
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147 let nmt = expand("<afile>:p:h") . "/X~=@l9q5"
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148 let nmte = nmt . "." . expand("<afile>:e")
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149 if rename(nm, nmte) == 0
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150 if &patchmode != "" && getfsize(nm . &patchmode) == -1
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151 " Create patchmode file by creating the decompressed file new
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152 call system(a:cmd . " -c " . nmte . " > " . nmt)
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153 call rename(nmte, nm . &patchmode)
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154 else
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155 call system(a:cmd . " " . nmte)
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156 endif
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157 call rename(nmt, nm)
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158 endif
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159 endif
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160 endfun
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161
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162 " find a file name for the file to be compressed. Use "name" without an
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163 " extension if possible. Otherwise use a weird name to avoid overwriting an
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164 " existing file.
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165 fun s:tempname(name)
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166 let fn = fnamemodify(a:name, ":r")
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167 if !filereadable(fn) && !isdirectory(fn)
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168 return fn
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169 endif
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170 return fnamemodify(a:name, ":p:h") . "/X~=@l9q5"
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171 endfun
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172
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173 " vim: set sw=2 :
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