202 lines
6.9 KiB
VimL
202 lines
6.9 KiB
VimL
" vim: ts=4 sw=4:
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" 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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" $HOME/.vim/after/ftplugin/markdown.vim
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"
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" original version from Steve Losh's gist: https://gist.github.com/1038710
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function! s:is_mkdCode(lnum)
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let name = synIDattr(synID(a:lnum, 1, 0), 'name')
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return (name =~# '^mkd\%(Code$\|Snippet\)' || name !=# '' && name !~? '^\%(mkd\|html\)')
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endfunction
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if get(g:, 'vim_markdown_folding_style_pythonic', 0)
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function! Foldexpr_markdown(lnum)
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let l1 = getline(a:lnum)
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"~~~~~ keep track of fenced code blocks ~~~~~
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"If we hit a code block fence
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if l1 =~# '````*' || l1 =~# '\~\~\~\~*'
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" toggle the variable that says if we're in a code block
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if b:fenced_block == 0
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let b:fenced_block = 1
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elseif b:fenced_block == 1
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let b:fenced_block = 0
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endif
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" else, if we're caring about front matter
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elseif get(g:, 'vim_markdown_frontmatter', 0) == 1
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" if we're in front matter and not on line 1
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if b:front_matter == 1 && a:lnum > 2
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let l0 = getline(a:lnum-1)
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" if the previous line fenced front matter
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if l0 ==# '---'
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" we must not be in front matter
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let b:front_matter = 0
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endif
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" else, if we're on line one
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elseif a:lnum == 1
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" if we hit a front matter fence
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if l1 ==# '---'
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" we're in the front matter
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let b:front_matter = 1
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endif
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endif
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endif
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" if we're in a code block or front matter
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if b:fenced_block ==# 1 || b:front_matter ==# 1
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if a:lnum ==# 1
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" fold any 'preamble'
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return '>1'
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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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endif
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let l2 = getline(a:lnum+1)
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" if the next line starts with two or more '='
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" and is not code
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if l2 =~# '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
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" next line is underlined (level 1)
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return '>0'
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" else, if the nex line starts with two or more '-'
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" but is not comment closer (-->)
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" and is not code
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elseif l2 =~# '^--\+\s*$' && !s:is_mkdCode(a:lnum+1)
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" next line is underlined (level 2)
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return '>1'
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endif
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"if we're on a non-code line starting with a pound sign
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if l1 =~# '^#' && !s:is_mkdCode(a:lnum)
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" set the fold level to the number of hashes -1
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" return '>'.(matchend(l1, '^#\+') - 1)
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" set the fold level to the number of hashes
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return '>'.(matchend(l1, '^#\+'))
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" else, if we're on line 1
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elseif a:lnum == 1
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" fold any 'preamble'
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return '>1'
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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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endfunction
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function! Foldtext_markdown()
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let line = getline(v:foldstart)
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let has_numbers = &number || &relativenumber
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let nucolwidth = &foldcolumn + has_numbers * &numberwidth
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let windowwidth = winwidth(0) - nucolwidth - 6
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let foldedlinecount = v:foldend - v:foldstart
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let line = strpart(line, 0, windowwidth - 2 -len(foldedlinecount))
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let line = substitute(line, '\%("""\|''''''\)', '', '')
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let fillcharcount = windowwidth - len(line) - len(foldedlinecount) + 1
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return line . ' ' . repeat('-', fillcharcount) . ' ' . foldedlinecount
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endfunction
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else " vim_markdown_folding_style_pythonic == 0
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function! Foldexpr_markdown(lnum)
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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 = getline(a:lnum-1)
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endif
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" keep track of fenced code blocks
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if l0 =~# '````*' || l0 =~# '\~\~\~\~*'
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if b:fenced_block == 0
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let b:fenced_block = 1
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elseif b:fenced_block == 1
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let b:fenced_block = 0
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endif
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elseif get(g:, 'vim_markdown_frontmatter', 0) == 1
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if b:front_matter == 1
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if l0 ==# '---'
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let b:front_matter = 0
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endif
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elseif a:lnum == 2
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if l0 ==# '---'
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let b:front_matter = 1
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endif
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endif
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endif
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if b:fenced_block == 1 || b:front_matter == 1
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" keep previous foldlevel
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return '='
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endif
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let l2 = getline(a:lnum+1)
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if l2 =~# '^==\+\s*' && !s:is_mkdCode(a:lnum+1)
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" next line is underlined (level 1)
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return '>1'
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elseif l2 =~# '^--\+\s*$' && !s:is_mkdCode(a:lnum+1)
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" next line is underlined (level 2)
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if s:vim_markdown_folding_level >= 2
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return '>1'
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else
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return '>2'
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endif
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endif
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let l1 = getline(a:lnum)
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if l1 =~# '^#' && !s:is_mkdCode(a:lnum)
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" fold level according to option
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if s:vim_markdown_folding_level == 1 || matchend(l1, '^#\+') > s:vim_markdown_folding_level
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if a:lnum == line('$')
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return matchend(l1, '^#\+') - 1
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else
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return -1
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endif
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else
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" headers are not folded
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return 0
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endif
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endif
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if l0 =~# '^#' && !s:is_mkdCode(a:lnum-1)
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" previous 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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endfunction
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endif
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let b:fenced_block = 0
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let b:front_matter = 0
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let s:vim_markdown_folding_level = get(g:, 'vim_markdown_folding_level', 1)
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function! s:MarkdownSetupFolding()
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if !get(g:, 'vim_markdown_folding_disabled', 0)
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if get(g:, 'vim_markdown_folding_style_pythonic', 0)
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if get(g:, 'vim_markdown_override_foldtext', 1)
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setlocal foldtext=Foldtext_markdown()
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endif
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endif
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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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endfunction
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function! s:MarkdownSetupFoldLevel()
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if get(g:, 'vim_markdown_folding_style_pythonic', 0)
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" set default foldlevel
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execute 'setlocal foldlevel='.s:vim_markdown_folding_level
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endif
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endfunction
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call s:MarkdownSetupFoldLevel()
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call s:MarkdownSetupFolding()
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augroup Mkd
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" These autocmds need to be kept in sync with the autocmds calling
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" s:MarkdownRefreshSyntax in ftplugin/markdown.vim.
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autocmd BufWinEnter,BufWritePost <buffer> call s:MarkdownSetupFolding()
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autocmd InsertEnter,InsertLeave <buffer> call s:MarkdownSetupFolding()
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autocmd CursorHold,CursorHoldI <buffer> call s:MarkdownSetupFolding()
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augroup END
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