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if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'markdown') == -1
" vim: ts=4 sw=4:
" folding for Markdown headers, both styles (atx- and setex-)
" http://daringfireball.net/projects/markdown/syntax#header
"
" this code can be placed in file
" $HOME/.vim/after/ftplugin/markdown.vim
"
" original version from Steve Losh's gist: https://gist.github.com/1038710
function! s:is_mkdCode(lnum)
let name = synIDattr(synID(a:lnum, 1, 0), 'name')
return (name =~ '^mkd\%(Code$\|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 == 0
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)
if get(g:, "vim_markdown_folding_style_pythonic", 0)
if get(g:, "vim_markdown_override_foldtext", 1)
setlocal foldtext=Foldtext_markdown()
endif
endif
setlocal foldexpr=Foldexpr_markdown(v:lnum)
setlocal foldmethod=expr
endif
endfunction
function! s:MarkdownSetupFoldLevel()
if get(g:, "vim_markdown_folding_style_pythonic", 0)
" set default foldlevel
execute "setlocal foldlevel=".s:vim_markdown_folding_level
endif
endfunction
call s:MarkdownSetupFoldLevel()
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
endif
|
