markdown.vim

setlocal autoindent
setlocal formatoptions=tcroqln
setlocal nofoldenable
setlocal comments=s1:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,b:-,b:+,b:*

abbreviate td [ ]
abbreviate tl - [ ]

nnoremap <silent><buffer> <Leader><Leader> :call ToggleCheckbox()<CR>
vnoremap <silent><buffer> <Leader><Leader> :call ToggleCheckbox()<CR>

inoremap <silent><buffer> <Tab> <C-o>:call IndentWithTab(1)<CR>
vnoremap <silent><buffer> <Tab> :call IndentWithTab(1)<CR>
inoremap <silent><buffer> <S-Tab> <C-o>:call IndentWithTab(-1)<CR>
vnoremap <silent><buffer> <S-Tab> :call IndentWithTab(-1)<CR>


function! ToggleCheckbox() abort
  let l = getline('.')
  if l =~ '\-\s\[\s\]'
    call setline('.', substitute(l, '\-\s\[\s\]', '- [x]', ''))
  elseif l =~ '\-\s\[x\]'
    call setline('.', substitute(l, '\-\s\[x\]',  '- [ ]', ''))
  elseif l =~ '\+\s\[\s\]'
    call setline('.', substitute(l, '\+\s\[\s\]', '+ [x]', ''))
  elseif l =~ '\+\s\[x\]'
    call setline('.', substitute(l, '\+\s\[x\]',  '+ [ ]', ''))
  elseif l =~ '\*\s\[\s\]'
    call setline('.', substitute(l, '\*\s\[\s\]', '* [x]', ''))
  elseif l =~ '\*\s\[x\]'
    call setline('.', substitute(l, '\*\s\[x\]',  '* [ ]', ''))
  end
endfunction

function! IndentWithTab(arrow) abort
  let l = getline('.')
  if l =~ '^\s*[\-\+\*]'
    if a:arrow > 0
      execute 'normal ' count . '>>'
    else
      execute 'normal ' count . '<<'
    endif
    " let c = col('.')
    " let col += shiftwidth()
    " if strwidth(getline('.')) == c
      " let c += 1
    " endif
    " call cursor(line('.'), c)
  end
endfunction