| " Vim indent file |
| " Language: Go |
| " Maintainer: David Barnett (https://github.com/google/vim-ft-go) |
| " Last Change: 2014 Aug 16 |
| " |
| " TODO: |
| " - function invocations split across lines |
| " - general line splits (line ends in an operator) |
| |
| if exists('b:did_indent') |
| finish |
| endif |
| let b:did_indent = 1 |
| |
| " C indentation is too far off useful, mainly due to Go's := operator. |
| " Let's just define our own. |
| setlocal nolisp |
| setlocal autoindent |
| setlocal indentexpr=GoIndent(v:lnum) |
| setlocal indentkeys+=<:>,0=},0=) |
| |
| if exists('*GoIndent') |
| finish |
| endif |
| |
| " The shiftwidth() function is relatively new. |
| " Don't require it to exist. |
| if exists('*shiftwidth') |
| function s:sw() abort |
| return shiftwidth() |
| endfunction |
| else |
| function s:sw() abort |
| return &shiftwidth |
| endfunction |
| endif |
| |
| function! GoIndent(lnum) |
| let l:prevlnum = prevnonblank(a:lnum-1) |
| if l:prevlnum == 0 |
| " top of file |
| return 0 |
| endif |
| |
| " grab the previous and current line, stripping comments. |
| let l:prevl = substitute(getline(l:prevlnum), '//.*$', '', '') |
| let l:thisl = substitute(getline(a:lnum), '//.*$', '', '') |
| let l:previ = indent(l:prevlnum) |
| |
| let l:ind = l:previ |
| |
| if l:prevl =~ '[({]\s*$' |
| " previous line opened a block |
| let l:ind += s:sw() |
| endif |
| if l:prevl =~# '^\s*\(case .*\|default\):$' |
| " previous line is part of a switch statement |
| let l:ind += s:sw() |
| endif |
| " TODO: handle if the previous line is a label. |
| |
| if l:thisl =~ '^\s*[)}]' |
| " this line closed a block |
| let l:ind -= s:sw() |
| endif |
| |
| " Colons are tricky. |
| " We want to outdent if it's part of a switch ("case foo:" or "default:"). |
| " We ignore trying to deal with jump labels because (a) they're rare, and |
| " (b) they're hard to disambiguate from a composite literal key. |
| if l:thisl =~# '^\s*\(case .*\|default\):$' |
| let l:ind -= s:sw() |
| endif |
| |
| return l:ind |
| endfunction |
| |
| " vim: sw=2 sts=2 et |