" Vim indent file
" Language   : Scala (http://scala-lang.org/)
" Maintainer : Stefan Matthias Aust
" Last Change: 2006 Apr 13

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

setlocal indentexpr=GetScalaIndent()

setlocal indentkeys=0{,0},0),!^F,<>>,<CR>

setlocal autoindent sw=2 et

if exists("*GetScalaIndent")
  finish
endif

function! CountParens(line)
  let line = substitute(a:line,'"\(.\|\\"\)*"','','g')
  let open = substitute(line,'[^(]','g')
  let close = substitute(line,'[^)]','g')
  return strlen(open) - strlen(close)
endfunction

function! GetScalaIndent()
  " Find a non-blank line above the current line.
  let lnum = prevnonblank(v:lnum - 1)

  " Hit the start of the file,use zero indent.
  if lnum == 0
    return 0
  endif

  let ind = indent(lnum)
  let prevline = getline(lnum)

  "Indent html literals
  if prevline !~ '/>\s*$' && prevline =~ '^\s*<[a-zA-Z][^>]*>\s*$'
    return ind + &shiftwidth
  endif

  "### Taken from mail on scala mailing list
  "### -------------------------------------
  " Add a 'shiftwidth' after lines that start a block
  " If if,for or while end with ),this is a one-line block
  " If val,var,def end with =,this is a one-line block
  "if prevline =~ '^\s*\<\(\(else\s\+\)\?if\|for\|while\|va[lr]\|def\)\>.*[)=]\s*$'
      "\ || prevline =~ '^\s*\<else\>\s*$'
      "\ || prevline =~ '{\s*$'
      "let ind = ind + &shiftwidth
      "endif
      " Add a 'shiftwidth' after lines that start a block
      " If if,this is a one-line block
      " If val,this is a one-line block
      if prevline =~ '^\s*\<\(\(else\s\+\)\?if\|for\|while\)\>.*[)]\s*$'
                  \ || prevline =~ '^\s*\<\(\(va[lr]\|def\)\>.*[=]\s*$'
                  \ || prevline =~ '^\s*\<else\>\s*$'
                  \ || prevline =~ '{\s*$'
          let ind = ind + &shiftwidth
      endif

  " If parenthesis are unbalanced,indent or dedent
  let c = CountParens(prevline)
  echo c
  if c > 0
    let ind = ind + &shiftwidth
  elseif c < 0
    let ind = ind - &shiftwidth
  endif

  "### Taken from mail on scala mailing list
  "### -------------------------------------
  " Dedent after if,for,while and val,def without block
  "let pprevline = getline(prevnonblank(lnum - 1))
  "if pprevline =~ '^\s*\<\(\(else\s\+\)\?if\|for\|while\|va[lr]\|def\)\>.*[)=]\s*$'
      "\ || pprevline =~ '^\s*\<else\>\s*$'
      "let ind = ind - &shiftwidth
      "endif
      " Dedent after if,def without block
      "let pprevline = getline(prevnonblank(lnum - 1))
      if pprevline =~ '^\s*\<\(\(else\s\+\)\?if\|for\|while\)\>.*[)]\s*$'
                  \ || pprevline =~ '^\s*\<\(\va[lr]\|def\)\>.*[=]\s*$'
                  \ || pprevline =~ '^\s*\<else\>\s*$'
          let ind = ind - &shiftwidth
      endif

  " Align 'for' clauses nicely
  if prevline =~ '^\s*\<for\> (.*;\s*$'
    let ind = ind - &shiftwidth + 5
  endif

  " Subtract a 'shiftwidth' on '}' or html
  let thisline = getline(v:lnum)
  if thisline =~ '^\s*[})]'
        \ || thisline =~ '^\s*</[a-zA-Z][^>]*>'
    let ind = ind - &shiftwidth
  endif

  return ind
endfunction

但是我没有任何线索,在这里引入了变化,试图在https://codereview.scala-lang.org/fisheye/browse/scala-svn/scala-tool-support/trunk/src/vim/indent/scala.vim的SVN历史中找到它