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20753
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1 " Elm indent plugin file
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2 " Language: Elm
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3 " Maintainer: Andreas Scharf <as@99n.de>
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4 " Original Author: Joseph Hager <ajhager@gmail.com>
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5 " Copyright: Joseph Hager <ajhager@gmail.com>
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6 " License: BSD3
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25880
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7 " Latest Revision: 2021-09-29
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20753
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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 " Local defaults
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16 setlocal expandtab
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17 setlocal indentexpr=GetElmIndent()
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18 setlocal indentkeys+=0=else,0=if,0=of,0=import,0=then,0=type,0\|,0},0\],0),=-},0=in
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19 setlocal nolisp
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20 setlocal nosmartindent
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21
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25880
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22 let b:undo_indent = "setl et< inde< indk< lisp< si<"
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23
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20753
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24 " Only define the function once.
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25 if exists('*GetElmIndent')
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26 finish
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27 endif
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28
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29 " Indent pairs
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30 function! s:FindPair(pstart, pmid, pend)
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31 "call search(a:pend, 'bW')
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32 return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
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33 endfunction
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34
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35 function! GetElmIndent()
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36 let l:lnum = v:lnum - 1
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37
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38 " Ident 0 if the first line of the file:
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39 if l:lnum == 0
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40 return 0
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41 endif
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42
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43 let l:ind = indent(l:lnum)
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44 let l:lline = getline(l:lnum)
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45 let l:line = getline(v:lnum)
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46
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47 " Indent if current line begins with '}':
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48 if l:line =~? '^\s*}'
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49 return s:FindPair('{', '', '}')
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50
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51 " Indent if current line begins with 'else':
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52 elseif l:line =~# '^\s*else\>'
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53 if l:lline !~# '^\s*\(if\|then\)\>'
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54 return s:FindPair('\<if\>', '', '\<else\>')
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55 endif
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56
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57 " Indent if current line begins with 'then':
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58 elseif l:line =~# '^\s*then\>'
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59 if l:lline !~# '^\s*\(if\|else\)\>'
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60 return s:FindPair('\<if\>', '', '\<then\>')
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61 endif
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62
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63 " HACK: Indent lines in case with nearest case clause:
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64 elseif l:line =~# '->' && l:line !~# ':' && l:line !~# '\\'
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65 return indent(search('^\s*case', 'bWn')) + &shiftwidth
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66
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67 " HACK: Don't change the indentation if the last line is a comment.
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68 elseif l:lline =~# '^\s*--'
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69 return l:ind
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70
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71 " Align the end of block comments with the start
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72 elseif l:line =~# '^\s*-}'
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73 return indent(search('{-', 'bWn'))
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74
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75 " Indent double shift after let with an empty rhs
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76 elseif l:lline =~# '\<let\>.*\s=$'
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77 return l:ind + 4 + &shiftwidth
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78
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79 " Align 'in' with the parent let.
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80 elseif l:line =~# '^\s*in\>'
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81 return indent(search('^\s*let', 'bWn'))
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82
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83 " Align bindings with the parent let.
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84 elseif l:lline =~# '\<let\>'
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85 return l:ind + 4
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86
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87 " Align bindings with the parent in.
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88 elseif l:lline =~# '^\s*in\>'
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89 return l:ind
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90
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91 endif
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92
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93 " Add a 'shiftwidth' after lines ending with:
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94 if l:lline =~# '\(|\|=\|->\|<-\|(\|\[\|{\|\<\(of\|else\|if\|then\)\)\s*$'
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95 let l:ind = l:ind + &shiftwidth
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96
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97 " Add a 'shiftwidth' after lines starting with type ending with '=':
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98 elseif l:lline =~# '^\s*type' && l:line =~# '^\s*='
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99 let l:ind = l:ind + &shiftwidth
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100
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101 " Back to normal indent after comments:
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102 elseif l:lline =~# '-}\s*$'
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103 call search('-}', 'bW')
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104 let l:ind = indent(searchpair('{-', '', '-}', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
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105
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106 " Ident some operators if there aren't any starting the last line.
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107 elseif l:line =~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*$'
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108 let l:ind = l:ind + &shiftwidth
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109
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110 elseif l:lline ==# '' && getline(l:lnum - 1) !=# ''
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111 let l:ind = indent(search('^\s*\S+', 'bWn'))
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112
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113 endif
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114
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115 return l:ind
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116 endfunc
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