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" this script by Shawn M Moore aka Sartak <sartak at gmail.com>
" also by Michael R Geddes aka frogonwheels <vimmer at frog.wheelycreek.net>
" originally by anonymous
" this in the public domain
" last updated 25 Mar 07
" this does nothing unless you,
" let g:rainbow = 1
" and set which kinds of character pairs you want to rainbow
" let g:rainbow_paren = 1 " ()
" let g:rainbow_brace = 1 " {}
" let g:rainbow_bracket = 1 " []
" let g:rainbow_angle = 1 " <>
" if you want the different types to nest, such that the braces in ({}) are
" colored the same as the internal parens of (()), then
" let g:rainbow_nested = 1
" you probably also want to use something like
" autocmd BufReadPost * source /path/to/rainbow_parens.vim
" autocmd BufNewFile * source /path/to/rainbow_parens.vim
if exists("g:rainbow") && g:rainbow != 0
hi level1c ctermfg=darkcyan
hi level2c ctermfg=darkgreen
hi level3c ctermfg=darkyellow
hi level4c ctermfg=darkblue
hi level5c ctermfg=darkmagenta
hi level6c ctermfg=darkred " this color is never nested, it only appears on the outermost layer
" helper function
func s:DoSyn(cur, top, left, right, uniq)
let uniq = a:uniq
if exists("g:rainbow_nested") && g:rainbow_nested != 0
let uniq = ""
endif
let cmd = 'syn region level'.uniq.a:cur.' transparent fold matchgroup=level'.a:cur.'c start=/'.a:left.'/ end=/'.a:right.'/ contains=TOP'
let i = a:cur
if i == 1
let i = a:top
endif
while i <= a:top
let cmd = cmd . ',level' . uniq . i
let i = i + 1
endwhile
exe cmd
endfunc
func s:DoSyntaxes(count)
let i = 1
while i <= a:count
" if you define new pairs, make sure to take into account that the
" delimiter is currently / and that it uses regex, so you need to escape
" regex metachars (like what is done for brackets)
if exists("g:rainbow_paren") && g:rainbow_paren != 0
call s:DoSyn(i, a:count, "(", ")", "a")
endif
if exists("g:rainbow_brace") && g:rainbow_brace != 0
call s:DoSyn(i, a:count, "{", "}", "b")
endif
if exists("g:rainbow_bracket") && g:rainbow_bracket != 0
call s:DoSyn(i, a:count, "\\[", "\\]", "c")
endif
if exists("g:rainbow_angle") && g:rainbow_angle != 0
call s:DoSyn(i, a:count, "<", ">", "d")
endif
let i = i + 1
endwhile
endfun
call s:DoSyntaxes(6) " 6 is the number of colors we have
delfun s:DoSyn
delfun s:DoSyntaxes
endif
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