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7
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1 " Vim script to work like "less"
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2 " Maintainer: Bram Moolenaar <Bram@vim.org>
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874
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3 " Last Change: 2006 May 07
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7
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4
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5 " Avoid loading this file twice, allow the user to define his own script.
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6 if exists("loaded_less")
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7 finish
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8 endif
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9 let loaded_less = 1
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10
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11 " If not reading from stdin, skip files that can't be read.
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12 " Exit if there is no file at all.
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13 if argc() > 0
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14 let s:i = 0
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15 while 1
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16 if filereadable(argv(s:i))
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17 if s:i != 0
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18 sleep 3
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19 endif
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20 break
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21 endif
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22 if isdirectory(argv(s:i))
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23 echomsg "Skipping directory " . argv(s:i)
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24 elseif getftime(argv(s:i)) < 0
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25 echomsg "Skipping non-existing file " . argv(s:i)
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26 else
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27 echomsg "Skipping unreadable file " . argv(s:i)
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28 endif
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29 echo "\n"
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30 let s:i = s:i + 1
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31 if s:i == argc()
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32 quit
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33 endif
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34 next
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35 endwhile
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36 endif
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37
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38 set nocp
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39 syntax on
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40 set so=0
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41 set hlsearch
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42 set incsearch
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43 nohlsearch
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44 " Don't remember file names and positions
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45 set viminfo=
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46 set nows
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47 " Inhibit screen updates while searching
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48 let s:lz = &lz
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49 set lz
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50
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51 " Used after each command: put cursor at end and display position
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52 if &wrap
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53 noremap <SID>L L0:redraw<CR>:file<CR>
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54 au VimEnter * normal! L0
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55 else
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56 noremap <SID>L Lg0:redraw<CR>:file<CR>
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57 au VimEnter * normal! Lg0
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58 endif
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59
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60 " When reading from stdin don't consider the file modified.
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61 au VimEnter * set nomod
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62
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63 " Can't modify the text
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64 set noma
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65
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66 " Give help
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67 noremap h :call <SID>Help()<CR>
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68 map H h
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69 fun! s:Help()
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70 echo "<Space> One page forward b One page backward"
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71 echo "d Half a page forward u Half a page backward"
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72 echo "<Enter> One line forward k One line backward"
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73 echo "G End of file g Start of file"
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74 echo "N% percentage in file"
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75 echo "\n"
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76 echo "/pattern Search for pattern ?pattern Search backward for pattern"
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77 echo "n next pattern match N Previous pattern match"
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78 echo "\n"
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79 echo ":n<Enter> Next file :p<Enter> Previous file"
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80 echo "\n"
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81 echo "q Quit v Edit file"
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82 let i = input("Hit Enter to continue")
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83 endfun
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84
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85 " Scroll one page forward
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86 noremap <script> <Space> :call <SID>NextPage()<CR><SID>L
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87 map <C-V> <Space>
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88 map f <Space>
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89 map <C-F> <Space>
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90 map z <Space>
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91 map <Esc><Space> <Space>
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92 fun! s:NextPage()
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93 if line(".") == line("$")
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94 if argidx() + 1 >= argc()
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95 quit
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96 endif
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97 next
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98 1
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99 else
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100 exe "normal! \<C-F>"
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101 endif
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102 endfun
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103
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104 " Re-read file and page forward "tail -f"
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105 map F :e<CR>G<SID>L:sleep 1<CR>F
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106
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107 " Scroll half a page forward
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108 noremap <script> d <C-D><SID>L
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109 map <C-D> d
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110
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111 " Scroll one line forward
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112 noremap <script> <CR> <C-E><SID>L
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113 map <C-N> <CR>
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114 map e <CR>
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115 map <C-E> <CR>
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116 map j <CR>
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117 map <C-J> <CR>
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118
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119 " Scroll one page backward
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120 noremap <script> b <C-B><SID>L
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121 map <C-B> b
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122 map w b
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123 map <Esc>v b
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124
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125 " Scroll half a page backward
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126 noremap <script> u <C-U><SID>L
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127 noremap <script> <C-U> <C-U><SID>L
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128
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129 " Scroll one line backward
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130 noremap <script> k <C-Y><SID>L
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131 map y k
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132 map <C-Y> k
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133 map <C-P> k
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134 map <C-K> k
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135
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136 " Redraw
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137 noremap <script> r <C-L><SID>L
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138 noremap <script> <C-R> <C-L><SID>L
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139 noremap <script> R <C-L><SID>L
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140
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141 " Start of file
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142 noremap <script> g gg<SID>L
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143 map < g
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144 map <Esc>< g
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145
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146 " End of file
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147 noremap <script> G G<SID>L
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148 map > G
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149 map <Esc>> G
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150
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151 " Go to percentage
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152 noremap <script> % %<SID>L
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153 map p %
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154
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155 " Search
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156 noremap <script> / H$:call <SID>Forward()<CR>/
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157 if &wrap
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158 noremap <script> ? H0:call <SID>Backward()<CR>?
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159 else
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160 noremap <script> ? Hg0:call <SID>Backward()<CR>?
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161 endif
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162
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163 fun! s:Forward()
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164 " Searching forward
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165 noremap <script> n H$nzt<SID>L
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166 if &wrap
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167 noremap <script> N H0Nzt<SID>L
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168 else
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169 noremap <script> N Hg0Nzt<SID>L
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170 endif
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171 cnoremap <script> <CR> <CR>:cunmap <lt>CR><CR>zt<SID>L
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172 endfun
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173
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174 fun! s:Backward()
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175 " Searching backward
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176 if &wrap
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177 noremap <script> n H0nzt<SID>L
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178 else
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179 noremap <script> n Hg0nzt<SID>L
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180 endif
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181 noremap <script> N H$Nzt<SID>L
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182 cnoremap <script> <CR> <CR>:cunmap <lt>CR><CR>zt<SID>L
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183 endfun
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184
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185 call s:Forward()
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186
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187 " Quitting
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188 noremap q :q<CR>
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189
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190 " Switch to editing (switch off less mode)
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191 map v :silent call <SID>End()<CR>
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192 fun! s:End()
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193 set ma
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874
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194 if exists('s:lz')
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7
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195 let &lz = s:lz
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196 endif
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197 unmap h
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198 unmap H
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199 unmap <Space>
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200 unmap <C-V>
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201 unmap f
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202 unmap <C-F>
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203 unmap z
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204 unmap <Esc><Space>
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205 unmap F
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206 unmap d
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207 unmap <C-D>
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208 unmap <CR>
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209 unmap <C-N>
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210 unmap e
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211 unmap <C-E>
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212 unmap j
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213 unmap <C-J>
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214 unmap b
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215 unmap <C-B>
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216 unmap w
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217 unmap <Esc>v
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218 unmap u
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219 unmap <C-U>
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220 unmap k
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221 unmap y
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222 unmap <C-Y>
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223 unmap <C-P>
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224 unmap <C-K>
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225 unmap r
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226 unmap <C-R>
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227 unmap R
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228 unmap g
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229 unmap <
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230 unmap <Esc><
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231 unmap G
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232 unmap >
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233 unmap <Esc>>
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234 unmap %
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235 unmap p
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236 unmap n
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237 unmap N
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238 unmap q
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239 unmap v
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240 unmap /
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241 unmap ?
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242 endfun
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243
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244 " vim: sw=2
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