Incorporated due date workaround from durcheinandr

ftplugin/todo.vim

@@ -39,7 +39,6 @@ function! TodoTxtUnMarkAsDone()
     :s/\s*x\s*\d\{4}-\d\{1,2}-\d\{1,2}\s*//g
 endfunction
 
-function! TodoTxtMarkAsDone()
 function! TodoTxtMarkAsDone()
     call TodoTxtPrependDate()
     normal! Ix 
@@ -85,6 +84,13 @@ function! TodoTxtSort()
     :sort /+[a-zA-Z]*/ r
     :sort /\v\([A-Z]\)/ r
 endfunction
+
+function! TodoTxtSortDue()
+    :silent! %s/\(due:\d\{4}\)-\(\d\{2}\)-\(\d\{2}\)/\1\2\3/g
+    :sort! n /due:/
+    :silent! %s/\(due:\d\{4}\)\(\d\{2}\)/\1-\2-/g
+    " TODO: add time sorting (YYYY-MM-DD HH:MM)
+endfunction
 
 " Mappings {{{1
 " Sort tasks {{{2
@@ -209,6 +215,11 @@ if !hasmapto("<localleader>D",'n')
 if !hasmapto("<localleader>D",'n')
     nnoremap <script> <silent> <buffer> <localleader>D :call TodoTxtRemoveCompleted()<CR>
 endif
+
+" Sort @_sched by due: date {{{2
+if !hasmapto("<localleader>sd".'n')
+    nnoremap <script> <silent> <buffer> <localleader>sd :call TodoTxtSortDue()<CR>
+endif
 
 " Folding {{{1
 " Options {{{2