+" vim: ts=4:
" folding for Markdown headers, both styles (atx- and setex-)
" http://daringfireball.net/projects/markdown/syntax#header
"
"
" original version from Steve Losh's gist: https://gist.github.com/1038710
-func! s:is_mkdCode(lnum)
- return synIDattr(synID(a:lnum, 1, 0), 'name') == 'mkdCode'
-endfunc
-
-func! s:effective_line(lnum)
- let line = getline(a:lnum)
- return (line !~ '^[=-#]' || s:is_mkdCode(a:lnum)) ? '' : line
-endfunc
-
-func! Foldexpr_markdown(lnum)
- let l2 = s:effective_line(a:lnum+1)
- if l2 =~ '^==\+\s*'
- " next line is underlined (level 1)
- return '>1'
- elseif l2 =~ '^--\+\s*'
- " next line is underlined (level 2)
- return '>2'
- endif
-
- let l1 = s:effective_line(a:lnum)
- if l1 =~ '^#'
- " don't include the section title in the fold
- return '-1'
- endif
-
- if (a:lnum == 1)
- let l0 = ''
- else
- let l0 = s:effective_line(a:lnum-1)
- endif
- if l0 =~ '^#'
- " current line starts with hashes
- return '>'.matchend(l0, '^#\+')
- else
- " keep previous foldlevel
- return '='
- endif
-endfunc
-
-
-if !get(g:, "vim_markdown_folding_disabled", 0)
- setlocal foldexpr=Foldexpr_markdown(v:lnum)
- setlocal foldmethod=expr
+function! s:is_mkdCode(lnum)
+ let name = synIDattr(synID(a:lnum, 1, 0), 'name')
+ return (name =~ '^mkd\%(Code$\|Snippet\)' || name != '' && name !~ '^\%(mkd\|html\)')
+endfunction
+
+if get(g:, "vim_markdown_folding_style_pythonic", 0)
+ function! Foldexpr_markdown(lnum)
+ let l1 = getline(a:lnum)
+ "~~~~~ keep track of fenced code blocks ~~~~~
+ "If we hit a code block fence
+ if l1 =~ '````*' || l1 =~ '\~\~\~\~*'
+ " toggle the variable that says if we're in a code block
+ if b:fenced_block == 0
+ let b:fenced_block = 1
+ elseif b:fenced_block == 1
+ let b:fenced_block = 0
+ endif
+ " else, if we're caring about front matter
+ elseif g:vim_markdown_frontmatter == 1
+ " if we're in front matter and not on line 1
+ if b:front_matter == 1 && a:lnum > 2
+ let l0 = getline(a:lnum-1)
+ " if the previous line fenced front matter
+ if l0 == '---'
+ " we must not be in front matter
+ let b:front_matter = 0
+ endif
+ " else, if we're on line one
+ elseif a:lnum == 1
+ " if we hit a front matter fence
+ if l1 == '---'
+ " we're in the front matter
+ let b:front_matter = 1
+ endif
+ endif
+ endif
+
+ " if we're in a code block or front matter
+ if b:fenced_block == 1 || b:front_matter == 1
+ if a:lnum == 1
+ " fold any 'preamble'
+ return '>1'
+ else
+ " keep previous foldlevel
+ return '='
+ endif
+ endif
+
+ let l2 = getline(a:lnum+1)
+ " if the next line starts with two or more '='
+ " and is not code
+ if l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
+ " next line is underlined (level 1)
+ return '>0'
+ " else, if the nex line starts with two or more '-'
+ " and is not code
+ elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
+ " next line is underlined (level 2)
+ return '>1'
+ endif
+
+ "if we're on a non-code line starting with a pound sign
+ if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
+ " set the fold level to the number of hashes -1
+ " return '>'.(matchend(l1, '^#\+') - 1)
+ " set the fold level to the number of hashes
+ return '>'.(matchend(l1, '^#\+'))
+ " else, if we're on line 1
+ elseif a:lnum == 1
+ " fold any 'preamble'
+ return '>1'
+ else
+ " keep previous foldlevel
+ return '='
+ endif
+ endfunction
+
+ function! Foldtext_markdown()
+ let line = getline(v:foldstart)
+ let has_numbers = &number || &relativenumber
+ let nucolwidth = &fdc + has_numbers * &numberwidth
+ let windowwidth = winwidth(0) - nucolwidth - 6
+ let foldedlinecount = v:foldend - v:foldstart
+ let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
+ let line = substitute(line, '\%("""\|''''''\)', '', '')
+ let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
+ return line . ' ' . repeat("-", fillcharcount) . ' ' . foldedlinecount
+ endfunction
+else " vim_markdown_folding_style_pythonic == 1
+ function! Foldexpr_markdown(lnum)
+ if (a:lnum == 1)
+ let l0 = ''
+ else
+ let l0 = getline(a:lnum-1)
+ endif
+
+ " keep track of fenced code blocks
+ if l0 =~ '````*' || l0 =~ '\~\~\~\~*'
+ if b:fenced_block == 0
+ let b:fenced_block = 1
+ elseif b:fenced_block == 1
+ let b:fenced_block = 0
+ endif
+ elseif g:vim_markdown_frontmatter == 1
+ if b:front_matter == 1
+ if l0 == '---'
+ let b:front_matter = 0
+ endif
+ elseif a:lnum == 2
+ if l0 == '---'
+ let b:front_matter = 1
+ endif
+ endif
+ endif
+
+ if b:fenced_block == 1 || b:front_matter == 1
+ " keep previous foldlevel
+ return '='
+ endif
+
+ let l2 = getline(a:lnum+1)
+ if l2 =~ '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
+ " next line is underlined (level 1)
+ return '>1'
+ elseif l2 =~ '^--\+\s*' && !s:is_mkdCode(a:lnum+1)
+ " next line is underlined (level 2)
+ if s:vim_markdown_folding_level >= 2
+ return '>1'
+ else
+ return '>2'
+ endif
+ endif
+
+ let l1 = getline(a:lnum)
+ if l1 =~ '^#' && !s:is_mkdCode(a:lnum)
+ " fold level according to option
+ if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
+ if a:lnum == line('$')
+ return matchend(l1, '^#\+') - 1
+ else
+ return -1
+ endif
+ else
+ " headers are not folded
+ return 0
+ endif
+ endif
+
+ if l0 =~ '^#' && !s:is_mkdCode(a:lnum-1)
+ " previous line starts with hashes
+ return '>'.matchend(l0, '^#\+')
+ else
+ " keep previous foldlevel
+ return '='
+ endif
+ endfunction
endif
+
+
+let b:fenced_block = 0
+let b:front_matter = 0
+let s:vim_markdown_folding_level = get(g:, "vim_markdown_folding_level", 1)
+
+function! s:MarkdownSetupFolding()
+ if !get(g:, "vim_markdown_folding_disabled", 0)
+ setlocal foldexpr=Foldexpr_markdown(v:lnum)
+ setlocal foldmethod=expr
+ if get(g:, "vim_markdown_folding_style_pythonic", 0) && get(g:, "vim_markdown_override_foldtext", 1)
+ setlocal foldtext=Foldtext_markdown()
+ endif
+ endif
+endfunction
+call s:MarkdownSetupFolding()
+augroup Mkd
+ " These autocmds need to be kept in sync with the autocmds calling
+ " s:MarkdownRefreshSyntax in ftplugin/markdown.vim.
+ autocmd BufWinEnter,BufWritePost <buffer> call s:MarkdownSetupFolding()
+ autocmd InsertEnter,InsertLeave <buffer> call s:MarkdownSetupFolding()
+ autocmd CursorHold,CursorHoldI <buffer> call s:MarkdownSetupFolding()
+augroup END
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