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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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3 " Last Change: 2004 Jan 12
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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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51 " After reading compressed file: Uncompress text in buffer with "cmd"
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52 fun s:read(cmd)
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53 " don't do anything if the cmd is not supported
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54 if !s:check(a:cmd)
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55 return
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56 endif
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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 " delete the compressed lines; remember the line number
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75 let l = line("'[") - 1
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76 if exists(":lockmarks")
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77 lockmarks '[,']d _
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78 else
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79 '[,']d _
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80 endif
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81 " read in the uncompressed lines "'[-1r tmp"
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82 setlocal nobin
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83 if exists(":lockmarks")
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84 execute "silent lockmarks " . l . "r " . tmp
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85 else
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86 execute "silent " . l . "r " . tmp
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87 endif
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88
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89 " if buffer became empty, delete trailing blank line
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90 if empty
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91 silent $delete _
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92 1
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93 endif
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94 " delete the temp file and the used buffers
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95 call delete(tmp)
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96 silent! exe "bwipe " . tmp
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97 silent! exe "bwipe " . tmpe
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98 let &pm = pm_save
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99 let &cpo = cpo_save
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100 let &l:ma = ma_save
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101 " When uncompressed the whole buffer, do autocommands
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102 if empty
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103 if &verbose >= 8
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104 execute "doau BufReadPost " . expand("%:r")
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105 else
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106 execute "silent! doau BufReadPost " . expand("%:r")
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107 endif
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108 endif
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109 endfun
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110
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111 " After writing compressed file: Compress written file with "cmd"
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112 fun s:write(cmd)
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113 " don't do anything if the cmd is not supported
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114 if s:check(a:cmd)
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115 " Rename the file before compressing it.
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116 let nm = expand("<afile>")
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117 let nmt = s:tempname(nm)
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118 if rename(nm, nmt) == 0
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119 call system(a:cmd . " " . nmt)
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120 call rename(nmt . "." . expand("<afile>:e"), nm)
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121 endif
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122 endif
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123 endfun
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124
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125 " Before appending to compressed file: Uncompress file with "cmd"
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126 fun s:appre(cmd)
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127 " don't do anything if the cmd is not supported
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128 if s:check(a:cmd)
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129 " Rename to a weird name to avoid the risk of overwriting another file
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130 let nm = expand("<afile>")
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131 let nmt = expand("<afile>:p:h") . "/X~=@l9q5"
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132 let nmte = nmt . "." . expand("<afile>:e")
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133 if rename(nm, nmte) == 0
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134 if &patchmode != "" && getfsize(nm . &patchmode) == -1
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135 " Create patchmode file by creating the decompressed file new
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136 call system(a:cmd . " -c " . nmte . " > " . nmt)
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137 call rename(nmte, nm . &patchmode)
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138 else
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139 call system(a:cmd . " " . nmte)
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140 endif
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141 call rename(nmt, nm)
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142 endif
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143 endif
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144 endfun
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145
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146 " find a file name for the file to be compressed. Use "name" without an
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147 " extension if possible. Otherwise use a weird name to avoid overwriting an
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148 " existing file.
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149 fun s:tempname(name)
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150 let fn = fnamemodify(a:name, ":r")
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151 if !filereadable(fn) && !isdirectory(fn)
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152 return fn
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153 endif
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154 return fnamemodify(a:name, ":p:h") . "/X~=@l9q5"
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155 endfun
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156
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157 " vim: set sw=2 :
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