add: markdown helper functions

vim/ftplugin/markdown.vim

@@ -8,6 +8,35 @@ function! s:MarkdownCreateLink()
   call feedkeys(keys, 'n')
 endfunction
 
+" insert `*` before line
+function! s:MarkdownAddListPrefix()
+  if mode() ==# 'v' || mode() ==# 'V' || mode() ==# "\<C-v>"
+    " replace all selection if it's in visual mode
+    execute '''<,''>s/\( \+\)\?/\1* /'
+  else
+    " repalce cursor line if it's in normal mode
+    execute 's/\( \+\)\?/\1* /'
+  endif
+endfunction
+
+" insert `[ ] ` before line
+function! s:MarkdownAddCheckBox()
+  if mode() ==# 'v' || mode() ==# 'V' || mode() ==# "\<C-v>"
+    " replace all selection if it's in visual mode
+    execute '''<,''>s/\( \+\)\?\(* \)\?/\1\2[ ] /'
+  else
+    " repalce cursor line if it's in normal mode
+    execute 's/\( \+\)\?\(* \)\?/\1\2[ ] /'
+  endif
+endfunction
 
 " Create link with selected text and copied URL
 vnoremap <buffer> <silent> <Leader>l :call <SID>MarkdownCreateLink()<CR>
+
+" insert `*` before line
+nnoremap <buffer> <silent> <Leader>* :call <SID>MarkdownAddListPrefix()<CR>
+vnoremap <buffer> <silent> <Leader>* :call <SID>MarkdownAddListPrefix()<CR>
+
+" insert `[ ] ` before line
+nnoremap <buffer> <silent> <Leader>[ :call <SID>MarkdownAddCheckBox()<CR>
+vnoremap <buffer> <silent> <Leader>[ :call <SID>MarkdownAddCheckBox()<CR>