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1 " Vim indent file
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2 " Language: LaTeX
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3 " Maintainer: Zhou YiChao <broken.zhou@gmail.com>
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4 " Created: Sat, 16 Feb 2002 16:50:19 +0100
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5 " Last Change: 2011 Dec 24
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6 " Last Update: 25th Sep 2002, by LH :
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7 " (*) better support for the option
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8 " (*) use some regex instead of several '||'.
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9 " Oct 9th, 2003, by JT:
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10 " (*) don't change indentation of lines starting with '%'
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11 " 2005/06/15, Moshe Kaminsky <kaminsky@math.huji.ac.il>
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12 " (*) New variables:
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13 " g:tex_items, g:tex_itemize_env, g:tex_noindent_env
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14 " 2011/3/6, by Zhou YiChao <broken.zhou@gmail.com>
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15 " (*) Don't change indentation of lines starting with '%'
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16 " I don't see any code with '%' and it doesn't work properly
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17 " so I add some code.
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18 " (*) New features: Add smartindent-like indent for "{}" and "[]".
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19 " (*) New variables: g:tex_indent_brace
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20 " 2011/9/25, by Zhou Yichao <broken.zhou@gmail.com>
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21 " (*) Bug fix: smartindent-like indent for "[]"
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22 " (*) New features: Align with "&".
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23 " (*) New variable: g:tex_indent_and
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24 " 2011/10/23 by Zhou Yichao <broken.zhou@gmail.com>
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25 " (*) Bug fix: improve the smartindent-like indent for "{}" and
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26 " "[]".
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27 "
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28 " Version: 0.62
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29
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30 " Options: {{{
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31 "
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32 " To set the following options (ok, currently it's just one), add a line like
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33 " let g:tex_indent_items = 1
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34 " to your ~/.vimrc.
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35 "
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36 " * g:tex_indent_brace
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37 "
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38 " If this variable is unset or non-zero, it will use smartindent-like style
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39 " for "{}" and "[]"
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40 "
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41 " * g:tex_indent_items
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42 "
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43 " If this variable is set, item-environments are indented like Emacs does
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44 " it, i.e., continuation lines are indented with a shiftwidth.
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45 "
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46 " NOTE: I've already set the variable below; delete the corresponding line
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47 " if you don't like this behaviour.
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48 "
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49 " Per default, it is unset.
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50 "
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51 " set unset
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52 " ----------------------------------------------------------------
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53 " \begin{itemize} \begin{itemize}
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54 " \item blablabla \item blablabla
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55 " bla bla bla bla bla bla
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56 " \item blablabla \item blablabla
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57 " bla bla bla bla bla bla
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58 " \end{itemize} \end{itemize}
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59 "
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60 "
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61 " * g:tex_items
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62 "
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63 " A list of tokens to be considered as commands for the beginning of an item
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64 " command. The tokens should be separated with '\|'. The initial '\' should
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65 " be escaped. The default is '\\bibitem\|\\item'.
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66 "
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67 " * g:tex_itemize_env
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68 "
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69 " A list of environment names, separated with '\|', where the items (item
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70 " commands matching g:tex_items) may appear. The default is
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71 " 'itemize\|description\|enumerate\|thebibliography'.
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72 "
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73 " * g:tex_noindent_env
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74 "
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75 " A list of environment names. separated with '\|', where no indentation is
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76 " required. The default is 'document\|verbatim'.
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77 "
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78 " * g:tex_indent_and
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79 "
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80 " If this variable is unset or zero, vim will try to align the line with first
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81 " "&". This is pretty useful when you use environment like table or align.
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82 " Note that this feature need to search back some line, so vim may become
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83 " a little slow.
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84 "
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85 " }}}
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86
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87 if exists("b:did_indent")
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88 finish
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89 endif
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90 let b:did_indent = 1
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91
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92 " Delete the next line to avoid the special indention of items
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93 if !exists("g:tex_indent_items")
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94 let g:tex_indent_items = 1
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95 endif
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96 if !exists("g:tex_indent_brace")
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97 let g:tex_indent_brace = 1
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98 endif
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99 if !exists("g:tex_indent_and")
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100 let g:tex_indent_and = 1
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101 endif
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102 if g:tex_indent_items
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103 if !exists("g:tex_itemize_env")
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104 let g:tex_itemize_env = 'itemize\|description\|enumerate\|thebibliography'
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105 endif
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106 if !exists('g:tex_items')
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107 let g:tex_items = '\\bibitem\|\\item'
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108 endif
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109 else
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110 let g:tex_items = ''
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111 endif
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112
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113 if !exists("g:tex_noindent_env")
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114 let g:tex_noindent_env = 'document\|verbatim\|lstlisting'
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115 endif
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116
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117 setlocal autoindent
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118 setlocal nosmartindent
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119 setlocal indentexpr=GetTeXIndent()
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120 exec 'setlocal indentkeys+=},],\&' . substitute(g:tex_items, '^\|\(\\|\)', ',=', 'g')
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121 let g:tex_items = '^\s*' . g:tex_items
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122
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123
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124 " Only define the function once
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125 if exists("*GetTeXIndent") | finish
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126 endif
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127
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128 let s:cpo_save = &cpo
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129 set cpo&vim
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130
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131 function GetTeXIndent()
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132 " Find a non-blank line above the current line.
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133 let lnum = prevnonblank(v:lnum - 1)
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134
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135 " Comment line is not what we need.
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136 while lnum != 0 && getline(lnum) =~ '^\s*%'
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137 let lnum = prevnonblank(lnum - 1)
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138 endwhile
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139
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140 " At the start of the file use zero indent.
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141 if lnum == 0
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142 return 0
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143 endif
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144
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145 let line = getline(lnum) " last line
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146 let cline = getline(v:lnum) " current line
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147
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148 " You want to align with "&"
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149 if g:tex_indent_and
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150 " Align with last line if last line has a "&"
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151 if stridx(cline, "&") != -1 && stridx(line, "&") != -1
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152 return indent(v:lnum) + stridx(line, "&") - stridx(cline, "&")
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153 endif
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154
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155 " set line & lnum to the line which doesn't contain "&"
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156 while lnum != 0 && (stridx(line, "&") != -1 || line =~ '^\s*%')
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157 let lnum = prevnonblank(lnum - 1)
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158 let line = getline(lnum)
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159 endwhile
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160 endif
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161
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162
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163 if lnum == 0
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164 return 0
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165 endif
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166
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167 let ind = indent(lnum)
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168
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169 " New code for comment: retain the indent of current line
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170 if cline =~ '^\s*%'
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171 return indent(v:lnum)
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172 endif
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173
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174 " Add a 'shiftwidth' after beginning of environments.
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175 " Don't add it for \begin{document} and \begin{verbatim}
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176 ""if line =~ '^\s*\\begin{\(.*\)}' && line !~ 'verbatim'
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177 " LH modification : \begin does not always start a line
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178 " ZYC modification : \end after \begin won't cause wrong indent anymore
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179 if line =~ '\\begin{.*}' && line !~ g:tex_noindent_env
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180 \ && line !~ '\\begin{.\{-}}.*\\end{.*}'
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181
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182 let ind = ind + &sw
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183
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184 if g:tex_indent_items
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185 " Add another sw for item-environments
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186 if line =~ g:tex_itemize_env
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187 let ind = ind + &sw
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188 endif
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189 endif
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190 endif
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191
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192
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193 " Subtract a 'shiftwidth' when an environment ends
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194 if cline =~ '^\s*\\end' && cline !~ g:tex_noindent_env
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195
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196 if g:tex_indent_items
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197 " Remove another sw for item-environments
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198 if cline =~ g:tex_itemize_env
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199 let ind = ind - &sw
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200 endif
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201 endif
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202
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203 let ind = ind - &sw
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204 endif
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205
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206 if g:tex_indent_brace
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207 " Add a 'shiftwidth' after a "{" or "[".
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208 let sum1 = 0
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209 for i in range(0, strlen(line)-1)
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210 if line[i] == "}" || line[i] == "]"
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211 let sum1 = max([0, sum1-1])
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212 endif
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213 if line[i] == "{" || line[i] == "["
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214 let sum1 += 1
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215 endif
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216 endfor
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217
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218 let sum2 = 0
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219 for i in reverse(range(0, strlen(cline)-1))
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220 if cline[i] == "{" || cline[i] == "["
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221 let sum2 = max([0, sum2-1])
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222 endif
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223 if cline[i] == "}" || cline[i] == "]"
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224 let sum2 += 1
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225 endif
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226 endfor
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227
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228 let ind += (sum1 - sum2) * &sw
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229 endif
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230
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231
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232 " Special treatment for 'item'
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233 " ----------------------------
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234
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235 if g:tex_indent_items
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236
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237 " '\item' or '\bibitem' itself:
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238 if cline =~ g:tex_items
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239 let ind = ind - &sw
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240 endif
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241
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242 " lines following to '\item' are intented once again:
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243 if line =~ g:tex_items
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244 let ind = ind + &sw
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245 endif
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246
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247 endif
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248
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249 return ind
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250 endfunction
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251
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252 let &cpo = s:cpo_save
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253 unlet s:cpo_save
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254
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255 " vim: set sw=4 textwidth=80:
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