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7
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1 " Vim indent file
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25880
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2 " Language: Makefile
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3 " Maintainer: Doug Kearns <dougkearns@gmail.com>
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4 " Previous Maintainer: Nikolai Weibull <now@bitwi.se>
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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=GetMakeIndent()
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1200
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13 setlocal indentkeys=!^F,o,O,<:>,=else,=endif
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844
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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 ai< inde< indk<"
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17
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7
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18 if exists("*GetMakeIndent")
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19 finish
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20 endif
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21
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1200
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22 let s:comment_rx = '^\s*#'
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839
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23 let s:rule_rx = '^[^ \t#:][^#:]*:\{1,2}\%([^=:]\|$\)'
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1200
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24 let s:continued_rule_rx = '^[^#:]*:\{1,2}\%([^=:]\|$\)'
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839
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25 let s:continuation_rx = '\\$'
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24569
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26 let s:assignment_rx = '^\s*\h\w*\s*[+:?]\==\s*\zs.*\\$'
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27 let s:folded_assignment_rx = '^\s*\h\w*\s*[+:?]\=='
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1200
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28 " TODO: This needs to be a lot more restrictive in what it matches.
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29 let s:just_inserted_rule_rx = '^\s*[^#:]\+:\{1,2}$'
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30 let s:conditional_directive_rx = '^ *\%(ifn\=\%(eq\|def\)\|else\)\>'
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31 let s:end_conditional_directive_rx = '^\s*\%(else\|endif\)\>'
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7
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32
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1200
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33 function s:remove_continuation(line)
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34 return substitute(a:line, s:continuation_rx, "", "")
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35 endfunction
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36
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7
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37 function GetMakeIndent()
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1200
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38 " TODO: Should this perhaps be v:lnum -1?
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39 " let prev_lnum = prevnonblank(v:lnum - 1)
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40 let prev_lnum = v:lnum - 1
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41 if prev_lnum == 0
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7
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42 return 0
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43 endif
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1200
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44 let prev_line = getline(prev_lnum)
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7
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45
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1200
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46 let prev_prev_lnum = prev_lnum - 1
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47 let prev_prev_line = prev_prev_lnum != 0 ? getline(prev_prev_lnum) : ""
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839
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48
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1200
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49 " TODO: Deal with comments. In comments, continuations aren't interesting.
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50 if prev_line =~ s:continuation_rx
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51 if prev_prev_line =~ s:continuation_rx
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52 return indent(prev_lnum)
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53 elseif prev_line =~ s:rule_rx
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11160
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54 return shiftwidth()
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1200
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55 elseif prev_line =~ s:assignment_rx
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56 call cursor(prev_lnum, 1)
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57 if search(s:assignment_rx, 'W') != 0
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58 return virtcol('.') - 1
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59 else
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60 " TODO: ?
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11160
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61 return shiftwidth()
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844
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62 endif
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1200
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63 else
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64 " TODO: OK, this might be a continued shell command, so perhaps indent
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65 " properly here? Leave this out for now, but in the next release this
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66 " should be using indent/sh.vim somehow.
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67 "if prev_line =~ '^\t' " s:rule_command_rx
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68 " if prev_line =~ '^\s\+[@-]\%(if\)\>'
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69 " return indent(prev_lnum) + 2
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70 " endif
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71 "endif
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11160
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72 return indent(prev_lnum) + shiftwidth()
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844
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73 endif
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1200
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74 elseif prev_prev_line =~ s:continuation_rx
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75 let folded_line = s:remove_continuation(prev_prev_line) . ' ' . s:remove_continuation(prev_line)
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76 let lnum = prev_prev_lnum - 1
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77 let line = getline(lnum)
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78 while line =~ s:continuation_rx
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79 let folded_line = s:remove_continuation(line) . ' ' . folded_line
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839
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80 let lnum -= 1
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81 let line = getline(lnum)
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82 endwhile
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1200
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83 let folded_lnum = lnum + 1
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84 if folded_line =~ s:rule_rx
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85 if getline(v:lnum) =~ s:rule_rx
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86 return 0
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87 else
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88 return &ts
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89 endif
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90 else
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91 " elseif folded_line =~ s:folded_assignment_rx
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92 if getline(v:lnum) =~ s:rule_rx
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93 return 0
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94 else
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95 return indent(folded_lnum)
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96 endif
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97 " else
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98 " " TODO: ?
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99 " return indent(prev_lnum)
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100 endif
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101 elseif prev_line =~ s:rule_rx
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102 if getline(v:lnum) =~ s:rule_rx
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103 return 0
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104 else
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105 return &ts
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106 endif
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107 elseif prev_line =~ s:conditional_directive_rx
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11160
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108 return shiftwidth()
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839
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109 else
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1200
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110 let line = getline(v:lnum)
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111 if line =~ s:just_inserted_rule_rx
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112 return 0
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113 elseif line =~ s:end_conditional_directive_rx
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11160
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114 return v:lnum - 1 == 0 ? 0 : indent(v:lnum - 1) - shiftwidth()
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1200
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115 else
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116 return v:lnum - 1 == 0 ? 0 : indent(v:lnum - 1)
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117 endif
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7
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118 endif
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119 endfunction
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