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6153
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1 " Vim indent file
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2 " Language: Go
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3 " Maintainer: David Barnett (https://github.com/google/vim-ft-go)
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11518
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4 " Last Change: 2017 Jun 13
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5 "
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6 " TODO:
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7 " - function invocations split across lines
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8 " - general line splits (line ends in an operator)
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9
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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 " C indentation is too far off useful, mainly due to Go's := operator.
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16 " Let's just define our own.
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17 setlocal nolisp
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18 setlocal autoindent
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19 setlocal indentexpr=GoIndent(v:lnum)
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20 setlocal indentkeys+=<:>,0=},0=)
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21
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22 if exists('*GoIndent')
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23 finish
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24 endif
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25
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26 function! GoIndent(lnum)
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27 let l:prevlnum = prevnonblank(a:lnum-1)
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28 if l:prevlnum == 0
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29 " top of file
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30 return 0
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31 endif
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32
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33 " grab the previous and current line, stripping comments.
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34 let l:prevl = substitute(getline(l:prevlnum), '//.*$', '', '')
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35 let l:thisl = substitute(getline(a:lnum), '//.*$', '', '')
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36 let l:previ = indent(l:prevlnum)
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37
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38 let l:ind = l:previ
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39
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40 if l:prevl =~ '[({]\s*$'
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41 " previous line opened a block
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42 let l:ind += shiftwidth()
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43 endif
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44 if l:prevl =~# '^\s*\(case .*\|default\):$'
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45 " previous line is part of a switch statement
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46 let l:ind += shiftwidth()
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47 endif
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48 " TODO: handle if the previous line is a label.
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49
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50 if l:thisl =~ '^\s*[)}]'
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51 " this line closed a block
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52 let l:ind -= shiftwidth()
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53 endif
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54
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55 " Colons are tricky.
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56 " We want to outdent if it's part of a switch ("case foo:" or "default:").
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57 " We ignore trying to deal with jump labels because (a) they're rare, and
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58 " (b) they're hard to disambiguate from a composite literal key.
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59 if l:thisl =~# '^\s*\(case .*\|default\):$'
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60 let l:ind -= shiftwidth()
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61 endif
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62
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63 return l:ind
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64 endfunction
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65
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66 " vim: sw=2 sts=2 et
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