" folding for Markdown headers, both styles (atx- and setex-)
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" http://daringfireball.net/projects/markdown/syntax#header
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"
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" this code can be placed in file
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" $HOME/.vim/after/ftplugin/markdown.vim
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"
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" original version from Steve Losh's gist: https://gist.github.com/1038710
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func! s:is_mkdCode(lnum)
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return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
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endfunc
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func! s:effective_line(lnum)
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let line = getline(a:lnum)
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return (line !~ '^[=-#]' || s:is_mkdCode(a:lnum)) ? '' : line
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endfunc
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func! Foldexpr_markdown(lnum)
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let l2 = s:effective_line(a:lnum+1)
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if l2 =~ '^==\+\s*'
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" next line is underlined (level 1)
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return '>1'
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elseif l2 =~ '^--\+\s*'
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" next line is underlined (level 2)
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return '>2'
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endif
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let l1 = s:effective_line(a:lnum)
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if l1 =~ '^#'
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" don't include the section title in the fold
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return '-1'
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endif
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if (a:lnum == 1)
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let l0 = ''
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else
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let l0 = s:effective_line(a:lnum-1)
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endif
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if l0 =~ '^#'
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" current line starts with hashes
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return '>'.matchend(l0, '^#\+')
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else
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" keep previous foldlevel
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return '='
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endif
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endfunc
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if !get(g:, "vim_markdown_folding_disabled", 0)
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setlocal foldexpr=Foldexpr_markdown(v:lnum)
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setlocal foldmethod=expr
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endif
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