91 lines
2.2 KiB
VimL
91 lines
2.2 KiB
VimL
if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'go') == -1
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" Copyright 2011 The Go Authors. All rights reserved.
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" Use of this source code is governed by a BSD-style
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" license that can be found in the LICENSE file.
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"
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" indent/go.vim: Vim indent file for Go.
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"
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" TODO:
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" - function invocations split across lines
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" - general line splits (line ends in an operator)
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if exists("b:did_indent")
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finish
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endif
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let b:did_indent = 1
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" C indentation is too far off useful, mainly due to Go's := operator.
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" Let's just define our own.
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setlocal nolisp
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setlocal autoindent
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setlocal indentexpr=GoIndent(v:lnum)
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setlocal indentkeys+=<:>,0=},0=)
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if exists("*GoIndent")
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finish
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endif
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" don't spam the user when Vim is started in Vi compatibility mode
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let s:cpo_save = &cpo
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set cpo&vim
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function! GoIndent(lnum) abort
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let prevlnum = prevnonblank(a:lnum-1)
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if prevlnum == 0
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" top of file
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return 0
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endif
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" grab the previous and current line, stripping comments.
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let prevl = substitute(getline(prevlnum), '//.*$', '', '')
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let thisl = substitute(getline(a:lnum), '//.*$', '', '')
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let previ = indent(prevlnum)
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let ind = previ
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for synid in synstack(a:lnum, 1)
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if synIDattr(synid, 'name') == 'goRawString'
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if prevl =~ '\%(\%(:\?=\)\|(\|,\)\s*`[^`]*$'
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" previous line started a multi-line raw string
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return 0
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endif
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" return -1 to keep the current indent.
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return -1
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endif
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endfor
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if prevl =~ '[({]\s*$'
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" previous line opened a block
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let ind += shiftwidth()
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endif
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if prevl =~# '^\s*\(case .*\|default\):$'
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" previous line is part of a switch statement
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let ind += shiftwidth()
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endif
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" TODO: handle if the previous line is a label.
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if thisl =~ '^\s*[)}]'
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" this line closed a block
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let ind -= shiftwidth()
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endif
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" Colons are tricky.
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" We want to outdent if it's part of a switch ("case foo:" or "default:").
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" We ignore trying to deal with jump labels because (a) they're rare, and
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" (b) they're hard to disambiguate from a composite literal key.
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if thisl =~# '^\s*\(case .*\|default\):$'
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let ind -= shiftwidth()
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endif
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return ind
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endfunction
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" restore Vi compatibility settings
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let &cpo = s:cpo_save
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unlet s:cpo_save
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" vim: sw=2 ts=2 et
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endif
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