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18456
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1 " Vim indent file
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2 " Language: Meson
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3 " License: VIM License
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4 " Maintainer: Nirbheek Chauhan <nirbheek.chauhan@gmail.com>
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5 " Original Authors: David Bustos <bustos@caltech.edu>
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6 " Bram Moolenaar <Bram@vim.org>
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7 " Last Change: 2019 Oct 18
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8
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9 " Only load this indent file when no other was loaded.
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10 if exists("b:did_indent")
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11 finish
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12 endif
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13 let b:did_indent = 1
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14
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15 " Some preliminary settings
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16 setlocal nolisp " Make sure lisp indenting doesn't supersede us
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17 setlocal autoindent " indentexpr isn't much help otherwise
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18
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19 setlocal indentexpr=GetMesonIndent(v:lnum)
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20 setlocal indentkeys+==elif,=else,=endforeach,=endif,0)
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21
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22 " Only define the function once.
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23 if exists("*GetMesonIndent")
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24 finish
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25 endif
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26 let s:keepcpo= &cpo
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27 set cpo&vim
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28
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29 " Come here when loading the script the first time.
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30
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31 let s:maxoff = 50 " maximum number of lines to look backwards for ()
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32
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33 function GetMesonIndent(lnum)
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34 echom getline(line("."))
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35
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36 " If this line is explicitly joined: If the previous line was also joined,
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37 " line it up with that one, otherwise add two 'shiftwidth'
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38 if getline(a:lnum - 1) =~ '\\$'
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39 if a:lnum > 1 && getline(a:lnum - 2) =~ '\\$'
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40 return indent(a:lnum - 1)
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41 endif
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42 return indent(a:lnum - 1) + (exists("g:mesonindent_continue") ? eval(g:mesonindent_continue) : (shiftwidth() * 2))
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43 endif
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44
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45 " If the start of the line is in a string don't change the indent.
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46 if has('syntax_items')
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47 \ && synIDattr(synID(a:lnum, 1, 1), "name") =~ "String$"
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48 return -1
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49 endif
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50
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51 " Search backwards for the previous non-empty line.
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52 let plnum = prevnonblank(v:lnum - 1)
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53
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54 if plnum == 0
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55 " This is the first non-empty line, use zero indent.
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56 return 0
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57 endif
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58
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59 " If the previous line is inside parenthesis, use the indent of the starting
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60 " line.
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61 " Trick: use the non-existing "dummy" variable to break out of the loop when
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62 " going too far back.
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63 call cursor(plnum, 1)
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64 let parlnum = searchpair('(\|{\|\[', '', ')\|}\|\]', 'nbW',
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65 \ "line('.') < " . (plnum - s:maxoff) . " ? dummy :"
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66 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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67 \ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
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68 if parlnum > 0
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69 let plindent = indent(parlnum)
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70 let plnumstart = parlnum
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71 else
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72 let plindent = indent(plnum)
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73 let plnumstart = plnum
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74 endif
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75
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76
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77 " When inside parenthesis: If at the first line below the parenthesis add
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78 " a 'shiftwidth', otherwise same as previous line.
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79 " i = (a
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80 " + b
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81 " + c)
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82 call cursor(a:lnum, 1)
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83 let p = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
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84 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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85 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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86 \ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
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87 if p > 0
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88 if p == plnum
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89 " When the start is inside parenthesis, only indent one 'shiftwidth'.
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90 let pp = searchpair('(\|{\|\[', '', ')\|}\|\]', 'bW',
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91 \ "line('.') < " . (a:lnum - s:maxoff) . " ? dummy :"
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92 \ . " synIDattr(synID(line('.'), col('.'), 1), 'name')"
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93 \ . " =~ '\\(Comment\\|Todo\\|String\\)$'")
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94 if pp > 0
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95 return indent(plnum) + (exists("g:pyindent_nested_paren") ? eval(g:pyindent_nested_paren) : shiftwidth())
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96 endif
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97 return indent(plnum) + (exists("g:pyindent_open_paren") ? eval(g:pyindent_open_paren) : shiftwidth())
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98 endif
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99 if plnumstart == p
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100 return indent(plnum)
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101 endif
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102 return plindent
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103 endif
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104
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105
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106 " Get the line and remove a trailing comment.
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107 " Use syntax highlighting attributes when possible.
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108 let pline = getline(plnum)
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109 let pline_len = strlen(pline)
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110 if has('syntax_items')
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111 " If the last character in the line is a comment, do a binary search for
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112 " the start of the comment. synID() is slow, a linear search would take
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113 " too long on a long line.
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114 if synIDattr(synID(plnum, pline_len, 1), "name") =~ "\\(Comment\\|Todo\\)$"
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115 let min = 1
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116 let max = pline_len
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117 while min < max
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118 let col = (min + max) / 2
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119 if synIDattr(synID(plnum, col, 1), "name") =~ "\\(Comment\\|Todo\\)$"
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120 let max = col
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121 else
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122 let min = col + 1
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123 endif
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124 endwhile
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125 let pline = strpart(pline, 0, min - 1)
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126 endif
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127 else
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128 let col = 0
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129 while col < pline_len
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130 if pline[col] == '#'
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131 let pline = strpart(pline, 0, col)
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132 break
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133 endif
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134 let col = col + 1
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135 endwhile
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136 endif
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137
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138 " If the previous line ended the conditional/loop
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139 if getline(plnum) =~ '^\s*\(endif\|endforeach\)\>\s*'
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140 " Maintain indent
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141 return -1
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142 endif
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143
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144 " If the previous line ended with a builtin, indent this line
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145 if pline =~ '^\s*\(foreach\|if\|else\|elif\)\>\s*'
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146 return plindent + shiftwidth()
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147 endif
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148
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149 " If the current line begins with a header keyword, deindent
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150 if getline(a:lnum) =~ '^\s*\(else\|elif\|endif\|endforeach\)'
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151
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152 " Unless the previous line was a one-liner
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153 if getline(plnumstart) =~ '^\s*\(foreach\|if\)\>\s*'
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154 return plindent
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155 endif
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156
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157 " Or the user has already dedented
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158 if indent(a:lnum) <= plindent - shiftwidth()
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159 return -1
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160 endif
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161
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162 return plindent - shiftwidth()
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163 endif
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164
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165 " When after a () construct we probably want to go back to the start line.
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166 " a = (b
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167 " + c)
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168 " here
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169 if parlnum > 0
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170 return plindent
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171 endif
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172
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173 return -1
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174
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175 endfunction
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176
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177 let &cpo = s:keepcpo
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178 unlet s:keepcpo
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179
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180 " vim:sw=2
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