go.vim (1767B)
1 " Vim indent file 2 " Language: Go 3 " Maintainer: David Barnett (https://github.com/google/vim-ft-go) 4 " Last Change: 2017 Jun 13 5 " 2023 Aug 28 by Vim Project (undo_indent) 6 " 7 " TODO: 8 " - function invocations split across lines 9 " - general line splits (line ends in an operator) 10 11 if exists('b:did_indent') 12 finish 13 endif 14 let b:did_indent = 1 15 16 " C indentation is too far off useful, mainly due to Go's := operator. 17 " Let's just define our own. 18 setlocal nolisp 19 setlocal autoindent 20 setlocal indentexpr=GoIndent(v:lnum) 21 setlocal indentkeys+=<:>,0=},0=) 22 23 let b:undo_indent = "setl ai< inde< indk< lisp<" 24 25 if exists('*GoIndent') 26 finish 27 endif 28 29 function! GoIndent(lnum) 30 let l:prevlnum = prevnonblank(a:lnum-1) 31 if l:prevlnum == 0 32 " top of file 33 return 0 34 endif 35 36 " grab the previous and current line, stripping comments. 37 let l:prevl = substitute(getline(l:prevlnum), '//.*$', '', '') 38 let l:thisl = substitute(getline(a:lnum), '//.*$', '', '') 39 let l:previ = indent(l:prevlnum) 40 41 let l:ind = l:previ 42 43 if l:prevl =~ '[({]\s*$' 44 " previous line opened a block 45 let l:ind += shiftwidth() 46 endif 47 if l:prevl =~# '^\s*\(case .*\|default\):$' 48 " previous line is part of a switch statement 49 let l:ind += shiftwidth() 50 endif 51 " TODO: handle if the previous line is a label. 52 53 if l:thisl =~ '^\s*[)}]' 54 " this line closed a block 55 let l:ind -= shiftwidth() 56 endif 57 58 " Colons are tricky. 59 " We want to outdent if it's part of a switch ("case foo:" or "default:"). 60 " We ignore trying to deal with jump labels because (a) they're rare, and 61 " (b) they're hard to disambiguate from a composite literal key. 62 if l:thisl =~# '^\s*\(case .*\|default\):$' 63 let l:ind -= shiftwidth() 64 endif 65 66 return l:ind 67 endfunction 68 69 " vim: sw=2 sts=2 et