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