TODO syntax highlighting for vim

.bashrc

todo () {
    if [ "$1" = "-g" ]; then
        path=$HOME
    else
        path=$(pwd)
        while [[ "$path" != "" && ! -e "$path/TODO" ]]; do
            path=${path%/*}
        done
        [ -z "$path" ] && path=$HOME
    fi
    $EDITOR "$path/TODO"
}

.vimrc

au BufRead,BufNewFile TODO,*.TODO,*.todo set filetype=todo

TODO

Types of items
    - Task
    x Completed
    > In progress
    - Something I should investigate?
    - Something important!
    . Something to keep in mind

Example list of things to do
    x Have some coffee
    x Call Mom
    - Go grocery shopping
        - Milk
            - Which brand?
            - Don't get skim milk! Ew.
        - Eggs (dozen)
        - Bread
            . The potato bread I got last time was really good
    x Post TODO syntax file as gist

TODO.vim

" Vim syntax file
" Language: TODO
" Last Change: 2012-07-25
" Author: Jesse Dubay <jesse@thefortytwo.net>
" Version: 0.3.0

if exists("b:current_syntax")
    finish
endif

syn match todoTopLevel /^[^x\- ].*$/
syn match todoHeaderDelim /^[\-\=]*$/
syn match todoLineItem /^\s*[\-\*] .*$/
syn match todoDoneItem /^\s*x .*$/
syn match todoImportantItem /^\s*! .*$/
syn match todoImportantItem /^\s*[\-\*] .*!.*$/
syn match todoQuestionItem /^\s*[\-\*] .*?.*$/
syn match todoQuestionItem /^\s*? .*$/
syn match todoNoteItem /^\s*\. .*$/
syn match todoInProgressItem /^\s*> .*$/

hi link todoTopLevel Function
hi link todoHeaderDelim Comment
hi link todoLineItem Normal
hi link todoDoneItem Comment
hi link todoImportantItem Title
hi link todoQuestionItem Special
hi link todoNoteItem SpecialComment
hi link todoInProgressItem String

let b:current_syntax = "todo"