" Vim indent file
" Language: Vim script
" Maintainer: Bram Moolenaar <[email protected]>
" Last Change: 2012 Aug 02

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1

setlocal indentexpr=GetVimIndent()
setlocal indentkeys+==end,=else,=cat,=fina,=END,0\\

let b:undo_indent = "setl indentkeys< indentexpr<"

" Only define the function once.
if exists("*GetVimIndent")
finish
endif
let s:keepcpo= &cpo
set cpo&vim

function GetVimIndent()
let ignorecase_save = &ignorecase
try
let &ignorecase = 0
return GetVimIndentIntern()
finally
let &ignorecase = ignorecase_save
endtry
endfunc

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

" If the current line doesn't start with '\' and below a line that starts
" with '\', use the indent of the line above it.
if getline(v:lnum) !~ '^\s*\\'
while lnum > 0 && getline(lnum) =~ '^\s*\\'
let lnum = lnum - 1
endwhile
endif

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

" Add a 'shiftwidth' after :if, :while, :try, :catch, :finally, :function
" and :else. Add it three times for a line that starts with '\' after
" a line that doesn't (or g:vim_indent_cont if it exists).
let ind = indent(lnum)
if getline(v:lnum) =~ '^\s*\\' && v:lnum > 1 && getline(lnum) !~ '^\s*\\'
if exists("g:vim_indent_cont")
let ind = ind + g:vim_indent_cont
else
let ind = ind + &sw * 3
endif
elseif getline(lnum) =~ '^\s*aug\%[roup]' && getline(lnum) !~ '^\s*aug\%[roup]\s*!\=\s\+END'
let ind = ind + &sw
else
let line = getline(lnum)
let i = match(line, '\(^\||\)\s*\(if\|wh\%[ile]\|for\|try\|cat\%[ch]\|fina\%[lly]\|fu\%[nction]\|el\%[seif]\)\>')
if i >= 0
let ind += &sw
if strpart(line, i, 1) == '|' && has('syntax_items')
\ && synIDattr(synID(lnum, i, 1), "name") =~ '\(Comment\|String\)$'
let ind -= &sw
endif
endif
endif

" If the previous line contains an "end" after a pipe, but not in an ":au"
" command. And not when there is a backslash before the pipe.
" And when syntax HL is enabled avoid a match inside a string.
let line = getline(lnum)
let i = match(line, '[^\\]|\s*\(ene\@!\)')
if i > 0 && line !~ '^\s*au\%[tocmd]'
if !has('syntax_items') || synIDattr(synID(lnum, i + 2, 1), "name") !~ '\(Comment\|String\)$'
let ind = ind - &sw
endif
endif


" Subtract a 'shiftwidth' on a :endif, :endwhile, :catch, :finally, :endtry,
" :endfun, :else and :augroup END.
if getline(v:lnum) =~ '^\s*\(ene\@!\|cat\|fina\|el\|aug\%[roup]\s*!\=\s\+END\)'
let ind = ind - &sw
endif

return ind
endfunction

let &cpo = s:keepcpo
unlet s:keepcpo

" vim:sw=2