" Vim indent file
" Language: Liquid
" Maintainer: Tim Pope <[email protected]>
" Last Change: 2013 May 30

if exists('b:did_indent')
finish
endif

set indentexpr=
if exists('b:liquid_subtype')
exe 'runtime! indent/'.b:liquid_subtype.'.vim'
else
runtime! indent/html.vim
endif
unlet! b:did_indent

if &l:indentexpr == ''
if &l:cindent
let &l:indentexpr = 'cindent(v:lnum)'
else
let &l:indentexpr = 'indent(prevnonblank(v:lnum-1))'
endif
endif
let b:liquid_subtype_indentexpr = &l:indentexpr

let b:did_indent = 1

setlocal indentexpr=GetLiquidIndent()
setlocal indentkeys=o,O,*<Return>,<>>,{,},0),0],o,O,!^F,=end,=endif,=endunless,=endifchanged,=endcase,=endfor,=endtablerow,=endcapture,=else,=elsif,=when,=empty

" Only define the function once.
if exists('*GetLiquidIndent')
finish
endif

function! s:count(string,pattern)
let string = substitute(a:string,'\C'.a:pattern,"\n",'g')
return strlen(substitute(string,"[^\n]",'','g'))
endfunction

function! GetLiquidIndent(...)
if a:0 && a:1 == '.'
let v:lnum = line('.')
elseif a:0 && a:1 =~ '^\d'
let v:lnum = a:1
endif
let vcol = col('.')
call cursor(v:lnum,1)
exe "let ind = ".b:liquid_subtype_indentexpr
let lnum = prevnonblank(v:lnum-1)
let line = getline(lnum)
let cline = getline(v:lnum)
let line = substitute(line,'\C^\%(\s*{%\s*end\w*\s*%}\)\+','','')
let line .= matchstr(cline,'\C^\%(\s*{%\s*end\w*\s*%}\)\+')
let cline = substitute(cline,'\C^\%(\s*{%\s*end\w*\s*%}\)\+','','')
let ind += &sw * s:count(line,'{%\s*\%(if\|elsif\|else\|unless\|ifchanged\|case\|when\|for\|empty\|tablerow\|capture\)\>')
let ind -= &sw * s:count(line,'{%\s*end\%(if\|unless\|ifchanged\|case\|for\|tablerow\|capture\)\>')
let ind -= &sw * s:count(cline,'{%\s*\%(elsif\|else\|when\|empty\)\>')
let ind -= &sw * s:count(cline,'{%\s*end\w*$')
return ind
endfunction