Easier customization of TODO keyword colors

["Ryan C. Thompson" <rct@thompsonclan.org>]

Here is some code I came up with some code to make it easier to 
customize the colors of various TODO keywords. As long as you just want 
a different color and nothing else, you can customize the variable 
org-todo-keyword-faces and use just a string color (i.e. a string of the 
color name) as the face, and then org-get-todo-face will convert the 
color to a face, inheriting everything else from the standard org-todo face.

To demonstrate, I currently have org-todo-keyword-faces set to
(("IN PROGRESS" . "dark orange")
  ("WAITING" . "red4")
  ("CANCELED" . "saddle brown"))

Here's the code, in a form you can put in your .emacs.

(eval-after-load 'org-faces
   '(progn
      (defcustom org-todo-keyword-faces nil
        "Faces for specific TODO keywords.
This is a list of cons cells, with TODO keywords in the car and
faces in the cdr.  The face can be a symbol, a color, or a
property list of attributes, like (:foreground \"blue\" :weight
bold :underline t)."
        :group 'org-faces
        :group 'org-todo
        :type '(repeat
                (cons
                 (string :tag "Keyword")
                 (choice color (sexp :tag "Face")))))))

(eval-after-load 'org
   '(progn
      (defun org-get-todo-face-from-color (color)
        "Returns a specification for a face that inherits from org-todo
   face and has the given color as foreground. Returns nil if
   color is nil."
        (when color
          `(:inherit org-warning :foreground ,color)))

      (defun org-get-todo-face (kwd)
        "Get the right face for a TODO keyword KWD.
If KWD is a number, get the corresponding match group."
        (if (numberp kwd) (setq kwd (match-string kwd)))
        (or (let ((face (cdr (assoc kwd org-todo-keyword-faces))))
              (if (stringp face)
                  (org-get-todo-face-from-color face)
                face))
            (and (member kwd org-done-keywords) 'org-done)
            'org-todo))))