Implements automatic conversion to new file format (#20)

Author: aserebryakov

README.md

@@ -257,8 +257,8 @@ Changelog
 #### 0.7.0
 
 * Added automatic date insertion feature
-* Items list are made markdown compatible
 * Added mappings for fast increasing/decreasing indent
+* Items list are made markdown compatible (old files updated automatically on load)
 
 Credits
 -------

doc/vim-todo-lists.txt

@@ -1,4 +1,4 @@
-*vim-todo-lists.txt*    Version 0.6.0
+*vim-todo-lists.txt*    Version 0.7.0
 *vim-todo-lists*
 
 Plugin for TODO lists management.
@@ -291,8 +291,9 @@ SOFTWARE.
 0.7.0
 
 * Added automatic date insertion feature
-* Items list are made markdown compatible
 * Added mappings for fast increasing/decreasing indent
+* Items list are made markdown compatible (old files updated automatically on
+  load)
 
 ==============================================================================
 8. Credits                                                 *VimTodoListsCredits*

plugin/vim-todo-lists.vim

@@ -50,6 +50,8 @@ function! VimTodoListsInit()
     call VimTodoListsSetItemMode()
   endif
 
+  call VimTodoListsMigrate()
+
 endfunction
 
 
@@ -423,6 +425,13 @@ function! VimTodoListsDecreaseIndent()
   normal! <<
 endfunction
 
+" Migrates file to new format
+function! VimTodoListsMigrate()
+  normal! mz
+  silent! execute ':%s/^\(\s*\)\(\[.\]\)/\1- \2/'
+  normal! 'z
+endfunction
+
 "Plugin startup code
 if !exists('g:vimtodolists_plugin')
   let g:vimtodolists_plugin = 1