Fixes the multiple items toggling (#5)

The fact that VimTodoListsToggleItem is called a number of times equal
to number of lines in range caused the issue of multiple times toggling
the items in range.
The solution is to remove range traversal unnecessary in the
VimTodoListsToggleItem() function.

Author: aserebryakov

plugin/vim-todo-lists.vim

@@ -63,7 +63,7 @@ function! VimTodoListsSetItemMode()
   nnoremap <buffer> j :VimTodoListsGoToNextItem<CR>
   nnoremap <buffer> k :VimTodoListsGoToPreviousItem<CR>
   nnoremap <buffer> <Space> :VimTodoListsToggleItem<CR>
-  vnoremap <buffer> <Space> :'<,'>VimTodoListsToggleItem<CR>
+  vnoremap <buffer> <Space> :VimTodoListsToggleItem<CR>
   inoremap <buffer> <CR> <CR><ESC>:VimTodoListsCreateNewItem<CR>
   noremap <buffer> <leader>e :silent call VimTodoListsSetNormalMode()<CR>
 endfunction
@@ -110,17 +110,16 @@ function! VimTodoListsGoToPreviousItem()
 endfunction
 
 
-" Toggles todo items in specified range
-function! VimTodoListsToggleItemsRange()
-  for lineno in range (a:firstline, a:lastline)
-    let l:line = getline(lineno)
+" Toggles todo list item
+function! VimTodoListsToggleItem()
+  let l:line = getline('.')
+
+  if match(l:line, '^\s*\[ \].*') != -1
+    call setline('.', substitute(l:line, '^\(\s*\)\[ \]', '\1[X]', ''))
+  elseif match(l:line, '^\s*\[X\] .*') != -1
+    call setline('.', substitute(l:line, '^\(\s*\)\[X\]', '\1[ ]', ''))
+  endif
 
-    if match(l:line, '^\s*\[ \].*') != -1
-      call setline(lineno, substitute(l:line, '^\(\s*\)\[ \]', '\1[X]', ''))
-    elseif match(l:line, '^\s*\[X\] .*') != -1
-      call setline(lineno, substitute(l:line, '^\(\s*\)\[X\]', '\1[ ]', ''))
-    endif
-  endfor
 endfunction
 
 
@@ -145,6 +144,6 @@ if !exists('g:vimtodolists_plugin')
   command! VimTodoListsCreateNewItem silent call VimTodoListsCreateNewItem()
   command! VimTodoListsGoToNextItem silent call VimTodoListsGoToNextItem()
   command! VimTodoListsGoToPreviousItem silent call VimTodoListsGoToPreviousItem()
-  command! -range VimTodoListsToggleItem silent <line1>,<line2>call VimTodoListsToggleItemsRange()
+  command! -range VimTodoListsToggleItem silent <line1>,<line2>call VimTodoListsToggleItem()
 endif