path: root/indent/vlang.vim

if has_key(g:polyglot_is_disabled, 'v')
  finish
endif

" Based on the Go identation file.
"
" 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.

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

setlocal nolisp
setlocal autoindent
setlocal indentexpr=VlangIndent(v:lnum)
setlocal indentkeys+=<:>,0=},0=)
setlocal noexpandtab

if exists("*VlangIndent")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

function! VlangIndent(lnum) abort
  let prevlnum = prevnonblank(a:lnum-1)
  if prevlnum == 0
    return 0
  endif

  let prevl = substitute(getline(prevlnum), '//.*$', '', '')
  let thisl = substitute(getline(a:lnum), '//.*$', '', '')
  let previ = indent(prevlnum)

  let ind = previ

  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

  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