Fix for <Leader>x and other minor issues

Fixed a bug in <Leader>x (todo#PrependDate) introduced last commit.
Fixed case sensitivity bug in todo#ToggleMarkAsDone() and todo#UnMarkAsDone()
Fixed errors being reported for repeat#set if vim-repeat plugin is not installed.
Fixed modeline in .vim files to work (only works on first/last 5 lines of file), and made the modelines consistent across all files.
New unit tests for todo#ToggleMarkAsDone()
Minor fixes for README.md and man page
Fix anchoring of RegExp in todo#ToggleMarkAsDone
Fixed a bug in overdue highlighting that resulted in the current date being matched on round dates like the 20th and 30th.
Added more unit tests for overdue date highlighting.
Corrected RegExp anchoring on today date highlighting.
Added a few bash scripts to make running unit tests easier and more reliable, including testing with ignorecase user preference set.

autoload/todo.vim

@@ -3,7 +3,6 @@
 " Author:      David Beniamine <david@beniamine.net>, Peter (fretep) <githib.5678@9ox.net>
 " Licence:     Vim licence
 " Website:     http://github.com/dbeniamine/todo.txt.vim
-" vim: ts=4 sw=4 :help tw=78 cc=80
 
 " These two variables are parameters for the successive calls the vim sort
 "   '' means no flags
@@ -30,7 +29,8 @@ function! todo#GetCurpos()
         return getpos('.')
 endfunction
 
-" Increment and Decrement The Priority
+" Increment and Decrement The Priority.
+" TODO: Make nrformats local to buffers of type todo
 :set nf=octal,hex,alpha
 
 function! todo#PrioritizeIncrease()
@@ -63,15 +63,14 @@ endfunction
 
 function! todo#PrependDate()
     if (getline(".") =~ '\v^\(')
-	    execute "normal! 0f)a\<space>\<esc>l\"=strftime(\"%Y-%m-%d\")\<esc>P"
+        execute "normal! 0f)a\<space>\<esc>l\"=strftime(\"%Y-%m-%d\")\<esc>P"
     else
-        normal! 0"=strftime("%Y-%m-%d ")
-        P
+        normal! I=strftime("%Y-%m-%d ")
     endif
 endfunction
 
 function! todo#ToggleMarkAsDone(status)
-    if (getline(".") =~ 'x\s*\d\{4\}')
+    if (getline(".") =~ '\C^\s*x\s*\d\{4\}')
         :call todo#UnMarkAsDone(a:status)
     else
         :call todo#MarkAsDone(a:status)
@@ -84,7 +83,7 @@ function! todo#UnMarkAsDone(status)
     else
         let pat=' '.a:status
     endif
-    exec ':s/\s*x\s*\d\{4}-\d\{1,2}-\d\{1,2}'.pat.'\s*//g'
+    exec ':s/\C^\s*x\s*\d\{4}-\d\{1,2}-\d\{1,2}'.pat.'\s*//g'
 endfunction
 
 function! todo#MarkAsDone(status)
@@ -138,6 +137,7 @@ function! todo#Sort()
     " vim :sort is usually stable
     " we sort first on contexts, then on projects and then on priority
     if expand('%')=~'[Dd]one.*.txt'
+        " FIXME: Put some unit tests around this, and fix case sensitivity if ignorecase is set.
         silent! %s/\(x\s*\d\{4}\)-\(\d\{2}\)-\(\d\{2}\)/\1\2\3/g
         sort n /^x\s*/
         silent! %s/\(x\s*\d\{4}\)\(\d\{2}\)/\1-\2-/g
@@ -443,4 +443,4 @@ fun! todo#Complete(findstart, base)
     endif
 endfun
 
-
+" vim: tabstop=4 shiftwidth=4 softtabstop=4 expandtab foldmethod=marker

autoload/todo/txt.vim

@@ -120,4 +120,4 @@ function! todo#txt#prioritize_add_action(priority)
 endfunction
 
 " Modeline {{{1
-" vim: ts=8 sw=4 sts=4 et foldenable foldmethod=marker foldcolumn=1
+" vim: tabstop=4 shiftwidth=4 softtabstop=4 expandtab foldmethod=marker