vim-md/ftplugin/markdown.vim

""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
" File:         ftplugin/markdown.vim
" Maintainer:   Andrew Nechaev <i@geekfrom.ru>
" Version:      0.1.0
" Modified:     2022-05-16 13:48+0400
" License:      MIT
""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""

set textwidth=120
set formatoptions+=t
set colorcolumn=-1
set wm=0
set wrap linebreak

nnoremap <buffer> <silent> <Leader>t :call winrestview(<SID>toggle({' ': 'x', 'x': '-', '-': ' '}))<cr>:w!<cr>
vnoremap <buffer> <silent> <Leader>t :call winrestview(<SID>toggle({' ': 'x', 'x': '-', '-': ' '}))<cr><esc>:w!<cr>

nnoremap <buffer> <silent> <Leader>r :call winrestview(<SID>toggleState('(', '( ) '))<cr>A
vnoremap <buffer> <silent> <Leader>r :call winrestview(<SID>toggleState('(', '( ) '))<cr>
nnoremap <buffer> <silent> <Leader>c :call winrestview(<SID>toggleState('[', '[ ] '))<cr>A
vnoremap <buffer> <silent> <Leader>c :call winrestview(<SID>toggleState('[', '[ ] '))<cr>

inoremap <buffer> <CR> <CR><Esc>:call <SID>auto_list()<CR>A
nnoremap <buffer> o o<Esc>:call <SID>auto_list()<CR>A
nnoremap <buffer> O O<Esc>:call <SID>auto_list()<CR>A

set tabstop=2 softtabstop=2 shiftwidth=2 expandtab

function s:toggle(dict)
  let view = winsaveview()
  execute 'keeppatterns s/^\s*\(-\s*\|+\s*\|*\s\)\?\s*[\[(]\zs.\ze[\])]/\=get(a:dict, submatch(0), a:0 ? a:1 : " ")/e'
  return view
endfunction

function s:toggleState(search, replacement)
  let view = winsaveview()
  execute 'keeppatterns s/^\s*\(-\s*\|+\s*\|*\s\)\?\zs\(\[.\]\|(.)\)\?\s*\ze/\=match(submatch(0), a:search) != -1 ? "" :  a:replacement/e'
  return view
endfunction

function! s:auto_list()
  let l:current_text = getline(line("."))<
  let l:preceding_line = getline(line(".") - 1)
  if l:preceding_line =~ '\v^\s*\d+\.'
    let l:list_index = matchstr(l:preceding_line, '\v\d+')
    let l:next = l:list_index + 1
    let l:whitespaces = matchstr(l:preceding_line, '\v^\s*')
    call setline(".", l:whitespaces.l:next.". ".l:current_text)
  elseif l:preceding_line =~ '^\s*\(-\s*\|+\s*\|*\s\)\?\(\[.\]\|\(.\)\)\?'
    let l:starter = matchstr(l:preceding_line, '^\s*\(-\s*\|+\s*\|*\s\)\?\(\[.\]\|(.)\)\?\s*')
    call setline(".", l:starter.l:current_text)
  endif
endfunction