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7
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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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8
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5 " Last Change: 2004 Jun 15
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7
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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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24
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25 let s:maxoff = 50 " maximum number of lines to look backwards for ()
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26
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27 function GetPythonIndent(lnum)
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28 " If this line is explicitly joined: If the previous line was also joined,
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29 " line it up with that one, otherwise add two 'shiftwidth'
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30 if getline(a:lnum - 1) =~ '\\$'
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31 if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
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32 return indent(a:lnum - 1)
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33 endif
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34 return indent(a:lnum - 1) + (&sw * 2)
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35 endif
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36
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37 " If the start of the line is in a string don't change the indent.
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38 if has('syntax_items')
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39 \ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
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40 return -1
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41 endif
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42
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43 " Search backwards for the previous non-empty line.
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44 let plnum = prevnonblank(v:lnum - 1)
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45
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46 if plnum == 0
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47 " This is the first non-empty line, use zero indent.
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48 return 0
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49 endif
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50
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51 " If the previous line is inside parenthesis, use the indent of the starting
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52 " line.
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53 " Trick: use the non-existing "dummy" variable to break out of the loop when
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54 " going too far back.
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55 call cursor(plnum, 1)
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56 let parlnum = searchpair('(', '', ')', 'nbW',
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57 \ "line('.') < " . (plnum - s:maxoff) . " ? dummy :"
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58 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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59 \ . " =~ '\\(Comment\\|String\\)$'")
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7
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60 if parlnum > 0
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61 let plindent = indent(parlnum)
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62 let plnumstart = parlnum
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63 else
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64 let plindent = indent(plnum)
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65 let plnumstart = plnum
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66 endif
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67
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68
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69 " When inside parenthesis: If at the first line below the parenthesis add
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70 " two 'shiftwidth', otherwise same as previous line.
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71 " i = (a
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72 " + b
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73 " + c)
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74 call cursor(a:lnum, 1)
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75 let p = searchpair('(', '', ')', 'bW',
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76 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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77 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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78 \ . " =~ '\\(Comment\\|String\\)$'")
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79 if p > 0
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80 if p == plnum
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81 " When the start is inside parenthesis, only indent one 'shiftwidth'.
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82 let pp = searchpair('(', '', ')', 'bW',
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83 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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84 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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85 \ . " =~ '\\(Comment\\|String\\)$'")
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86 if pp > 0
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87 return indent(plnum) + &sw
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88 endif
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89 return indent(plnum) + (&sw * 2)
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90 endif
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91 if plnumstart == p
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92 return indent(plnum)
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93 endif
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94 return plindent
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95 endif
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96
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97
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98 " Get the line and remove a trailing comment.
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99 " Use syntax highlighting attributes when possible.
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100 let pline = getline(plnum)
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101 let pline_len = strlen(pline)
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102 let col = 0
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103 while col < pline_len
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104 if pline[col] == '#' && (!has('syntax_items')
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105 \ || synIDattr(synID(plnum, col + 1, 1), "name") =~ "Comment$")
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106 let pline = strpart(pline, 0, col)
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107 break
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108 endif
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109 let col = col + 1
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110 endwhile
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111
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112 " If the previous line ended with a colon, indent this line
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113 if pline =~ ':\s*$'
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114 return plindent + &sw
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115 endif
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116
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117 " If the previous line was a stop-execution statement...
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118 if getline(plnum) =~ '^\s*\(break\|continue\|raise\|return\)\>'
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119 " See if the user has already dedented
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120 if indent(a:lnum) > indent(plnum) - &sw
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121 " If not, recommend one dedent
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122 return indent(plnum) - &sw
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123 endif
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124 " Otherwise, trust the user
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125 return -1
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126 endif
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127
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128 " If the current line begins with a keyword that lines up with "try"
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129 if getline(a:lnum) =~ '^\s*\(except\|finally\)\>'
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130 let lnum = a:lnum - 1
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131 while lnum >= 1
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132 echomsg 'got here'
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133 if getline(lnum) =~ '^\s*\(try\|except\)\>'
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134 let ind = indent(lnum)
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135 echomsg 'got here, indent is ' . ind
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136 if ind >= indent(a:lnum)
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137 return -1 " indent is already less than this
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138 endif
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139 return ind " line up with previous try or except
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140 endif
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141 let lnum = lnum - 1
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142 endwhile
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143 echomsg 'got to the end'
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144 return -1 " no matching "try"!
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145 endif
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146
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147 " If the current line begins with a header keyword, dedent
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148 if getline(a:lnum) =~ '^\s*\(elif\|else\)\>'
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149
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150 " Unless the previous line was a one-liner
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151 if getline(plnumstart) =~ '^\s*\(for\|if\|try\)\>'
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152 return plindent
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153 endif
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154
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155 " Or the user has already dedented
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156 if indent(a:lnum) <= plindent - &sw
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157 return -1
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158 endif
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159
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160 return plindent - &sw
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161 endif
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162
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163 " When after a () construct we probably want to go back to the start line.
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164 " a = (b
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165 " + c)
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166 " here
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167 if parlnum > 0
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168 return plindent
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169 endif
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170
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171 return -1
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172
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173 endfunction
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174
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175 " vim:sw=2
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