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7
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1 " Vim indent file
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25880
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2 " Language: Tcl
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3 " Maintainer: Chris Heithoff <chrisheithoff@gmail.com>
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15131
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4 " Previous Maintainer: Nikolai Weibull <now@bitwi.se>
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25880
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5 " Last Change: 24 Sep 2021
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7
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6
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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=GetTclIndent()
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375
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13 setlocal indentkeys=0{,0},!^F,o,O,0]
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1213
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14 setlocal nosmartindent
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7
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15
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25880
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16 let b:undo_indent = "setl inde< indk< si<"
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17
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18 if exists("*GetTclIndent")
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19 finish
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20 endif
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21
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375
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22 function s:prevnonblanknoncomment(lnum)
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23 let lnum = prevnonblank(a:lnum)
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24 while lnum > 0
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25 let line = getline(lnum)
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26 if line !~ '^\s*\(#\|$\)'
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27 break
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28 endif
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29 let lnum = prevnonblank(lnum - 1)
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30 endwhile
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31 return lnum
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32 endfunction
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33
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34 function s:ends_with_backslash(lnum)
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35 let line = getline(a:lnum)
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36 if line =~ '\\\s*$'
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37 return 1
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38 else
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39 return 0
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40 endif
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41 endfunction
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42
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375
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43 function s:count_braces(lnum, count_open)
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44 let n_open = 0
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45 let n_close = 0
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46 let line = getline(a:lnum)
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47 let pattern = '[{}]'
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375
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48 let i = match(line, pattern)
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49 while i != -1
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50 if synIDattr(synID(a:lnum, i + 1, 0), 'name') !~ 'tcl\%(Comment\|String\)'
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375
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51 if line[i] == '{'
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52 let n_open += 1
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53 elseif line[i] == '}'
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54 if n_open > 0
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55 let n_open -= 1
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56 else
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57 let n_close += 1
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58 endif
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59 endif
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60 endif
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61 let i = match(line, pattern, i + 1)
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62 endwhile
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63 return a:count_open ? n_open : n_close
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64 endfunction
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65
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375
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66 function GetTclIndent()
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67 let line = getline(v:lnum)
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68
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69 " Get the line number of the previous non-blank or non-comment line.
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70 let pnum = s:prevnonblanknoncomment(v:lnum - 1)
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71 if pnum == 0
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72 return 0
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73 endif
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74
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75 " ..and the previous line before the previous line.
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76 let pnum2 = s:prevnonblanknoncomment(pnum-1)
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77
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78 " Default indentation is to preserve the previous indentation.
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79 let ind = indent(pnum)
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80
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81 " ...but if previous line introduces an open brace, then increase current line's indentation
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82 if s:count_braces(pnum, 1) > 0
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83 let ind += shiftwidth()
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84 else
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85 " Look for backslash line continuation on the previous two lines.
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86 let slash1 = s:ends_with_backslash(pnum)
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87 let slash2 = s:ends_with_backslash(pnum2)
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88 if slash1 && !slash2
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89 " If the previous line begins a line continuation.
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90 let ind += shiftwidth()
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91 elseif !slash1 && slash2
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92 " If two lines ago was the end of a line continuation group of lines.
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93 let ind -= shiftwidth()
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94 endif
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375
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95 endif
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96
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97 " If the current line begins with a closed brace, then decrease the indentation by one.
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98 if line =~ '^\s*}'
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99 let ind -= shiftwidth()
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100 endif
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101
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389
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102 return ind
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103 endfunction
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