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25880
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1 " Vim indent file
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2 " Language: nginx.conf
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3 " Maintainer: Chris Aumann <me@chr4.org>
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4 " Last Change: 2022 Dec 01
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5
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6 " Only load this indent file when no other was loaded.
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7 if exists('b:did_indent')
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8 finish
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9 endif
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10 let b:did_indent = 1
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11
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12 setlocal indentexpr=GetNginxIndent()
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13
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14 setlocal indentkeys=0{,0},0#,!^F,o,O
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15
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16 let b:undo_indent = 'setl inde< indk<'
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17
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18 " Only define the function once.
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19 if exists('*GetNginxIndent')
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20 finish
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21 endif
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22
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23 function GetNginxIndent() abort
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24 let plnum = s:PrevNotAsBlank(v:lnum - 1)
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25
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26 " Hit the start of the file, use zero indent.
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27 if plnum == 0
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28 return 0
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29 endif
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30
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31 let ind = indent(plnum)
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32
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33 " Add a 'shiftwidth' after '{'
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34 if s:AsEndWith(getline(plnum), '{')
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35 let ind = ind + shiftwidth()
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36 end
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37
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38 " Subtract a 'shiftwidth' on '}'
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39 " This is the part that requires 'indentkeys'.
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40 if getline(v:lnum) =~ '^\s*}'
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41 let ind = ind - shiftwidth()
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42 endif
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43
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44 let pplnum = s:PrevNotAsBlank(plnum - 1)
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45
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46 if s:IsLineContinuation(plnum)
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47 if !s:IsLineContinuation(pplnum)
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48 let ind = ind + shiftwidth()
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49 end
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50 else
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51 if s:IsLineContinuation(pplnum)
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52 let ind = ind - shiftwidth()
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53 end
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54 endif
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55
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56 return ind
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57 endfunction
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58
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59 " Find the first line at or above {lnum} that is non-blank and not a comment.
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60 function s:PrevNotAsBlank(lnum) abort
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61 let lnum = prevnonblank(a:lnum)
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62 while lnum > 0
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63 if getline(lnum) !~ '^\s*#'
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64 break
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65 endif
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66 let lnum = prevnonblank(lnum - 1)
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67 endwhile
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68 return lnum
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69 endfunction
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70
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71 " Check whether {line} ends with {pat}, ignoring trailing comments.
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72 function s:AsEndWith(line, pat) abort
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73 return a:line =~ a:pat . '\m\s*\%(#.*\)\?$'
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74 endfunction
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75
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76 function s:IsLineContinuation(lnum) abort
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77 return a:lnum > 0 && !s:AsEndWith(getline(a:lnum), '[;{}]')
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78 endfunction
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