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" 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 shiftwidth=2 tabstop=2 softtabstop=2 expandtab
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
" 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\)\>.*[)]\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
" Dedent after if, for, while and val, var, 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
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