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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 AT gmail.com>
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4 " Created: Sat, 16 Feb 2002 16:50:19 +0100
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5 " Last Change: 2012 Mar 18 19:19:50
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6 " Version: 0.7
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7 " Please email me if you found something we can do. Bug report and
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8 " feature request is welcome.
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9
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10 " Last Update: {{{
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11 " 25th Sep 2002, by LH :
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12 " (*) better support for the option
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13 " (*) use some regex instead of several '||'.
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14 " Oct 9th, 2003, by JT:
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15 " (*) don't change indentation of lines starting with '%'
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16 " 2005/06/15, Moshe Kaminsky <kaminsky AT math.huji.ac.il>
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17 " (*) New variables:
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18 " g:tex_items, g:tex_itemize_env, g:tex_noindent_env
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19 " 2011/3/6, by Zhou YiChao <broken.zhou AT gmail.com>
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20 " (*) Don't change indentation of lines starting with '%'
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21 " I don't see any code with '%' and it doesn't work properly
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22 " so I add some code.
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23 " (*) New features: Add smartindent-like indent for "{}" and "[]".
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24 " (*) New variables: g:tex_indent_brace
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25 " 2011/9/25, by Zhou Yichao <broken.zhou AT gmail.com>
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26 " (*) Bug fix: smartindent-like indent for "[]"
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27 " (*) New features: Align with "&".
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28 " (*) New variable: g:tex_indent_and.
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29 " 2011/10/23 by Zhou Yichao <broken.zhou AT gmail.com>
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30 " (*) Bug fix: improve the smartindent-like indent for "{}" and
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31 " "[]".
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32 " 2012/02/27 by Zhou Yichao <broken.zhou AT gmail.com>
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33 " (*) Bug fix: support default folding marker.
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34 " (*) Indent with "&" is not very handy. Make it not enable by
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35 " default.
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36 " 2012/03/06 by Zhou Yichao <broken.zhou AT gmail.com>
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37 " (*) Modify "&" behavior and make it default again. Now "&"
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38 " won't align when there are more then one "&" in the previous
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39 " line.
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40 " (*) Add indent "\left(" and "\right)"
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41 " (*) Trust user when in "verbatim" and "lstlisting"
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42 " 2012/03/11 by Zhou Yichao <broken.zhou AT gmail.com>
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43 " (*) Modify "&" so that only indent when current line start with
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44 " "&".
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45 " 2012/03/12 by Zhou Yichao <broken.zhou AT gmail.com>
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46 " (*) Modify indentkeys.
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47 " 2012/03/18 by Zhou Yichao <broken.zhou AT gmail.com>
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48 " (*) Add &cpo
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49 " }}}
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50
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51 " Document: {{{
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52 "
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53 " To set the following options (ok, currently it's just one), add a line like
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54 " let g:tex_indent_items = 1
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55 " to your ~/.vimrc.
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56 "
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57 " * g:tex_indent_brace
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58 "
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59 " If this variable is unset or non-zero, it will use smartindent-like style
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60 " for "{}" and "[]"
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61 "
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62 " * g:tex_indent_items
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63 "
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64 " If this variable is set, item-environments are indented like Emacs does
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65 " it, i.e., continuation lines are indented with a shiftwidth.
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66 "
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67 " NOTE: I've already set the variable below; delete the corresponding line
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68 " if you don't like this behaviour.
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69 "
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70 " Per default, it is unset.
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71 "
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72 " set unset
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73 " ----------------------------------------------------------------
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74 " \begin{itemize} \begin{itemize}
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75 " \item blablabla \item blablabla
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76 " bla bla bla bla bla bla
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77 " \item blablabla \item blablabla
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78 " bla bla bla bla bla bla
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79 " \end{itemize} \end{itemize}
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80 "
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81 "
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82 " * g:tex_items
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83 "
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84 " A list of tokens to be considered as commands for the beginning of an item
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85 " command. The tokens should be separated with '\|'. The initial '\' should
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86 " be escaped. The default is '\\bibitem\|\\item'.
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87 "
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88 " * g:tex_itemize_env
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89 "
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90 " A list of environment names, separated with '\|', where the items (item
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91 " commands matching g:tex_items) may appear. The default is
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92 " 'itemize\|description\|enumerate\|thebibliography'.
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93 "
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94 " * g:tex_noindent_env
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95 "
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96 " A list of environment names. separated with '\|', where no indentation is
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97 " required. The default is 'document\|verbatim'.
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98 "
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99 " * g:tex_indent_and
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100 "
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101 " If this variable is unset or zero, vim will try to align the line with first
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102 " "&". This is pretty useful when you use environment like table or align.
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103 " Note that this feature need to search back some line, so vim may become
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104 " a little slow.
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105 "
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106 " }}}
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107
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108 " Only define the function once
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109 if exists("*GetTeXIndent")
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110 finish
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111 endif
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112
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113 if exists("b:did_indent")
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114 finish
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115 endif
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116
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117 let s:cpo_save = &cpo
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118 set cpo&vim
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119
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120 " Define global variable {{{
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121
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122 let b:did_indent = 1
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123
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124 if !exists("g:tex_indent_items")
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125 let g:tex_indent_items = 1
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126 endif
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127 if !exists("g:tex_indent_brace")
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128 let g:tex_indent_brace = 1
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129 endif
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130 if !exists("g:tex_indent_and")
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131 let g:tex_indent_and = 1
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132 endif
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133 if g:tex_indent_items
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134 if !exists("g:tex_itemize_env")
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135 let g:tex_itemize_env = 'itemize\|description\|enumerate\|thebibliography'
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136 endif
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137 if !exists('g:tex_items')
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138 let g:tex_items = '\\bibitem\|\\item'
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139 endif
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140 else
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141 let g:tex_items = ''
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142 endif
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143
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144 if !exists("g:tex_indent_paretheses")
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145 let g:tex_indent_paretheses = 1
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146 endif
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147
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148 if !exists("g:tex_noindent_env")
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149 let g:tex_noindent_env = 'document\|verbatim\|lstlisting'
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150 endif "}}}
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151
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152 " VIM Setting " {{{
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153 setlocal autoindent
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154 setlocal nosmartindent
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155 setlocal indentexpr=GetTeXIndent()
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156 setlocal indentkeys&
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157 exec 'setlocal indentkeys+=[,(,{,),},],\&' . substitute(g:tex_items, '^\|\(\\|\)', ',=', 'g')
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158 let g:tex_items = '^\s*' . substitute(g:tex_items, '^\(\^\\s\*\)*', '', '')
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159 " }}}
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160
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161 function GetTeXIndent() " {{{
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162 " Find a non-blank line above the current line.
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163 let lnum = prevnonblank(v:lnum - 1)
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164
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165 " Comment line is not what we need.
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166 while lnum != 0 && getline(lnum) =~ '^\s*%'
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167 let lnum = prevnonblank(lnum - 1)
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168 endwhile
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169
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170 " At the start of the file use zero indent.
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171 if lnum == 0
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172 return 0
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173 endif
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174
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175 let line = substitute(getline(lnum), '%.*', ' ','g') " last line
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176 let cline = substitute(getline(v:lnum), '%.*', ' ', 'g') " current line
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177
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178 " We are in verbatim, so do what our user what.
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179 if synIDattr(synID(v:lnum, indent(v:lnum), 1), "name") == "texZone"
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180 if empty(cline)
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181 return indent(lnum)
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182 else
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183 return indent(v:lnum)
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184 end
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185 endif
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186
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187 " You want to align with "&"
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188 if g:tex_indent_and
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189 " Align only when current line start with "&"
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190 if line =~ '&.*\\\\' && cline =~ '^\s*&'
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191 return indent(v:lnum) + stridx(line, "&") - stridx(cline, "&")
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192 endif
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193
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194 " set line & lnum to the line which doesn't contain "&"
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195 while lnum != 0 && (stridx(line, "&") != -1 || line =~ '^\s*%')
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196 let lnum = prevnonblank(lnum - 1)
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197 let line = getline(lnum)
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198 endwhile
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199 endif
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200
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201
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202 if lnum == 0
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203 return 0
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204 endif
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205
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206 let ind = indent(lnum)
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207
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208 " New code for comment: retain the indent of current line
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209 if cline =~ '^\s*%'
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210 return indent(v:lnum)
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211 endif
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212
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213 " Add a 'shiftwidth' after beginning of environments.
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214 " Don't add it for \begin{document} and \begin{verbatim}
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215 ""if line =~ '^\s*\\begin{\(.*\)}' && line !~ 'verbatim'
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216 " LH modification : \begin does not always start a line
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217 " ZYC modification : \end after \begin won't cause wrong indent anymore
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218 if line =~ '\\begin{.*}' && line !~ g:tex_noindent_env
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219 let ind = ind + &sw
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220
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221 if g:tex_indent_items
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222 " Add another sw for item-environments
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223 if line =~ g:tex_itemize_env
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224 let ind = ind + &sw
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225 endif
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226 endif
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227 endif
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228
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229 " Subtract a 'shiftwidth' when an environment ends
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230 if cline =~ '\\end{.*}' && cline !~ g:tex_noindent_env
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231
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232 if g:tex_indent_items
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233 " Remove another sw for item-environments
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234 if cline =~ g:tex_itemize_env
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235 let ind = ind - &sw
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236 endif
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237 endif
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238
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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 if g:tex_indent_brace
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243 let sum1 = 0
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244 for i in range(0, strlen(line)-1)
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245 if line[i] == "}" || line[i] == "]" ||
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246 \ strpart(line, i, 7) == '\right)'
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247 let sum1 = max([0, sum1-1])
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248 endif
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249 if line[i] == "{" || line[i] == "[" ||
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250 \ strpart(line, i, 6) == '\left('
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251 let sum1 += 1
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252 endif
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253 endfor
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254
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255 let sum2 = 0
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256 for i in reverse(range(0, strlen(cline)-1))
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257 if cline[i] == "{" || cline[i] == "[" ||
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258 \ strpart(cline, i, 6) == '\left('
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259 let sum2 = max([0, sum2-1])
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260 endif
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261 if cline[i] == "}" || cline[i] == "]" ||
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262 \ strpart(cline, i, 7) == '\right)'
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263 let sum2 += 1
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264 endif
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265 endfor
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266
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267 let ind += (sum1 - sum2) * &sw
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268 endif
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269
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270 if g:tex_indent_paretheses
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271 endif
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272
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273 " Special treatment for 'item'
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274 " ----------------------------
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275
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276 if g:tex_indent_items
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277
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278 " '\item' or '\bibitem' itself:
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279 if cline =~ g:tex_items
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280 let ind = ind - &sw
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281 endif
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282
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283 " lines following to '\item' are intented once again:
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284 if line =~ g:tex_items
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285 let ind = ind + &sw
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286 endif
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287
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288 endif
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289
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290 return ind
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291 endfunction "}}}
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292
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293 let &cpo = s:cpo_save
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294 unlet s:cpo_save
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295
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296 " vim: set sw=4 textwidth=80:
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