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emacs: Re-work the implementation of highlighting in notmuch-search-mode.

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Re-write `notmuch-search-color-line', with the following improvements:
 - create overlays only if they will be needed,
 - merge the properties specified for a tag on top of any matching a
   previous tag.
This commit is contained in:
David Edmondson 2010-06-07 15:35:10 +01:00 committed by Carl Worth
parent bec47efeeb
commit f99ad42da0
1 changed files with 21 additions and 16 deletions
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37
emacs/notmuch.el
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@ -585,28 +585,33 @@ This function advances the next thread when finished."
Here is an example of how to color search results based on tags. Here is an example of how to color search results based on tags.
(the following text would be placed in your ~/.emacs file): (the following text would be placed in your ~/.emacs file):
(setq notmuch-search-line-faces '((\"delete\" . '(:foreground \"red\")) (setq notmuch-search-line-faces '((\"delete\" . '(:foreground \"red\"
:background \"blue\"))
(\"unread\" . '(:foreground \"green\")))) (\"unread\" . '(:foreground \"green\"))))
Order matters: for lines with multiple tags, the the first The attributes defined for matching tags are merged, with later
matching will be applied." attributes overriding earlier. A message having both \"delete\"
and \"unread\" tags with the above settings would have a green
foreground and blue background."
:type '(alist :key-type (string) :value-type (list)) :type '(alist :key-type (string) :value-type (list))
:group 'notmuch) :group 'notmuch)
(defun notmuch-search-color-line (start end line-tag-list) (defun notmuch-search-color-line (start end line-tag-list)
"Colorize lines in notmuch-show based on tags" "Colorize lines in `notmuch-show' based on tags."
(if notmuch-search-line-faces ;; Create the overlay only if the message has tags which match one
(let ((overlay (make-overlay start end)) ;; of those specified in `notmuch-search-line-faces'.
(tags-faces (copy-alist notmuch-search-line-faces))) (let (overlay)
(while tags-faces (mapc '(lambda (elem)
(let* ((tag-face (car tags-faces)) (let ((tag (car elem))
(tag (car tag-face)) (attributes (cdr elem)))
(face (cdr tag-face))) (when (member tag line-tag-list)
(cond ((member tag line-tag-list) (when (not overlay)
(overlay-put overlay 'face face) (setq overlay (make-overlay start end)))
(setq tags-faces nil)) ;; Merge the specified properties with any already
(t ;; applied from an earlier match.
(setq tags-faces (cdr tags-faces))))))))) (overlay-put overlay 'face
(append (overlay-get overlay 'face) attributes)))))
notmuch-search-line-faces)))
(defun notmuch-search-isearch-authors-show (overlay) (defun notmuch-search-isearch-authors-show (overlay)
(remove-from-invisibility-spec (cons (overlay-get overlay 'invisible) t))) (remove-from-invisibility-spec (cons (overlay-get overlay 'invisible) t)))