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1 " Vim indent file
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2 " Language: Python
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3 " Maintainer: Bram Moolenaar <Bram@vim.org>
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4 " Original Author: David Bustos <bustos@caltech.edu>
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48
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5 " Last Change: 2012 May 01
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0
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6
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7 " Only load this indent file when no other was loaded.
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8 if exists("b:did_indent")
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9 finish
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10 endif
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11 let b:did_indent = 1
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12
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13 " Some preliminary settings
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14 setlocal nolisp " Make sure lisp indenting doesn't supersede us
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15 setlocal autoindent " indentexpr isn't much help otherwise
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16
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17 setlocal indentexpr=GetPythonIndent(v:lnum)
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18 setlocal indentkeys+=<:>,=elif,=except
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19
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20 " Only define the function once.
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21 if exists("*GetPythonIndent")
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22 finish
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23 endif
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48
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24 let s:keepcpo= &cpo
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25 set cpo&vim
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0
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26
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27 " Come here when loading the script the first time.
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28
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29 let s:maxoff = 50 " maximum number of lines to look backwards for ()
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30
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31 function GetPythonIndent(lnum)
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32
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33 " If this line is explicitly joined: If the previous line was also joined,
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34 " line it up with that one, otherwise add two 'shiftwidth'
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35 if getline(a:lnum - 1) =~ '\\$'
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36 if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
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37 return indent(a:lnum - 1)
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38 endif
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39 return indent(a:lnum - 1) + (exists("g:pyindent_continue") ? eval(g:pyindent_continue) : (&sw * 2))
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40 endif
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41
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42 " If the start of the line is in a string don't change the indent.
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43 if has('syntax_items')
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44 \ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
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45 return -1
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46 endif
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47
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48 " Search backwards for the previous non-empty line.
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49 let plnum = prevnonblank(v:lnum - 1)
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50
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51 if plnum == 0
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52 " This is the first non-empty line, use zero indent.
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53 return 0
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54 endif
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55
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56 " If the previous line is inside parenthesis, use the indent of the starting
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57 " line.
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58 " Trick: use the non-existing "dummy" variable to break out of the loop when
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59 " going too far back.
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60 call cursor(plnum, 1)
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61 let parlnum = searchpair('(\|{\|\[', '', ')\|}\|\]', 'nbW',
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62 \ "line('.') < " . (plnum - s:maxoff) . " ? dummy :"
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63 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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64 \ . " =~ '\\(Comment\\|String\\)$'")
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65 if parlnum > 0
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66 let plindent = indent(parlnum)
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67 let plnumstart = parlnum
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68 else
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69 let plindent = indent(plnum)
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70 let plnumstart = plnum
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71 endif
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72
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73
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74 " When inside parenthesis: If at the first line below the parenthesis add
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75 " two 'shiftwidth', otherwise same as previous line.
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76 " i = (a
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77 " + b
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78 " + c)
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79 call cursor(a:lnum, 1)
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80 let p = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
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81 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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82 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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83 \ . " =~ '\\(Comment\\|String\\)$'")
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84 if p > 0
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85 if p == plnum
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86 " When the start is inside parenthesis, only indent one 'shiftwidth'.
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87 let pp = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
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88 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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89 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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90 \ . " =~ '\\(Comment\\|String\\)$'")
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91 if pp > 0
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92 return indent(plnum) + (exists("g:pyindent_nested_paren") ? eval(g:pyindent_nested_paren) : &sw)
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93 endif
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94 return indent(plnum) + (exists("g:pyindent_open_paren") ? eval(g:pyindent_open_paren) : (&sw * 2))
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95 endif
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96 if plnumstart == p
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97 return indent(plnum)
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98 endif
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99 return plindent
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100 endif
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101
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102
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103 " Get the line and remove a trailing comment.
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104 " Use syntax highlighting attributes when possible.
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105 let pline = getline(plnum)
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106 let pline_len = strlen(pline)
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107 if has('syntax_items')
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108 " If the last character in the line is a comment, do a binary search for
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109 " the start of the comment. synID() is slow, a linear search would take
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110 " too long on a long line.
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111 if synIDattr(synID(plnum, pline_len, 1), "name") =~ "Comment$"
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112 let min = 1
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113 let max = pline_len
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114 while min < max
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115 let col = (min + max) / 2
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116 if synIDattr(synID(plnum, col, 1), "name") =~ "Comment$"
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117 let max = col
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118 else
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119 let min = col + 1
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120 endif
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121 endwhile
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122 let pline = strpart(pline, 0, min - 1)
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123 endif
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124 else
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125 let col = 0
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126 while col < pline_len
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127 if pline[col] == '#'
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128 let pline = strpart(pline, 0, col)
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129 break
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130 endif
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131 let col = col + 1
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132 endwhile
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133 endif
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134
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135 " If the previous line ended with a colon, indent this line
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136 if pline =~ ':\s*$'
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137 return plindent + &sw
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138 endif
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139
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140 " If the previous line was a stop-execution statement...
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141 if getline(plnum) =~ '^\s*\(break\|continue\|raise\|return\|pass\)\>'
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142 " See if the user has already dedented
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143 if indent(a:lnum) > indent(plnum) - &sw
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144 " If not, recommend one dedent
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145 return indent(plnum) - &sw
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146 endif
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147 " Otherwise, trust the user
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148 return -1
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149 endif
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150
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151 " If the current line begins with a keyword that lines up with "try"
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152 if getline(a:lnum) =~ '^\s*\(except\|finally\)\>'
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153 let lnum = a:lnum - 1
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154 while lnum >= 1
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155 if getline(lnum) =~ '^\s*\(try\|except\)\>'
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156 let ind = indent(lnum)
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157 if ind >= indent(a:lnum)
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158 return -1 " indent is already less than this
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159 endif
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160 return ind " line up with previous try or except
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161 endif
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162 let lnum = lnum - 1
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163 endwhile
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164 return -1 " no matching "try"!
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165 endif
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166
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167 " If the current line begins with a header keyword, dedent
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168 if getline(a:lnum) =~ '^\s*\(elif\|else\)\>'
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169
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170 " Unless the previous line was a one-liner
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171 if getline(plnumstart) =~ '^\s*\(for\|if\|try\)\>'
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172 return plindent
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173 endif
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174
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175 " Or the user has already dedented
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176 if indent(a:lnum) <= plindent - &sw
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177 return -1
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178 endif
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179
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180 return plindent - &sw
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181 endif
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182
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183 " When after a () construct we probably want to go back to the start line.
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184 " a = (b
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185 " + c)
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186 " here
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187 if parlnum > 0
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188 return plindent
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189 endif
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190
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191 return -1
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192
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193 endfunction
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194
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48
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195 let &cpo = s:keepcpo
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196 unlet s:keepcpo
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197
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198 " vim:sw=2
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