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emacs: Support cid: references with shr renderer

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shr has really nice support for inline image rendering, but previously
we only had the hooks for w3m cid: references.
This commit is contained in:
Austin Clements 2015-01-24 16:17:03 -05:00 committed by David Bremner
parent f84cbb1d4d
commit b74ed1cfad
1 changed files with 37 additions and 8 deletions
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43
emacs/notmuch-show.el
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@ -767,14 +767,43 @@ will return nil if the CID is unknown or cannot be retrieved."
nil))))
(defun notmuch-show-insert-part-text/html (msg part content-type nth depth button)
;; text/html handler to work around bugs in renderers and our
;; invisibile parts code. In particular w3m sets up a keymap which
;; "leaks" outside the invisible region and causes strange effects
;; in notmuch. We set mm-inline-text-html-with-w3m-keymap to nil to
;; tell w3m not to set a keymap (so the normal notmuch-show-mode-map
;; remains).
(if (eq mm-text-html-renderer 'shr)
;; It's easier to drive shr ourselves than to work around the
;; goofy things `mm-shr' does (like irreversibly taking over
;; content ID handling).
(notmuch-show--insert-part-text/html-shr msg part)
;; Otherwise, let message-mode do the heavy lifting
;;
;; w3m sets up a keymap which "leaks" outside the invisible region
;; and causes strange effects in notmuch. We set
;; mm-inline-text-html-with-w3m-keymap to nil to tell w3m not to
;; set a keymap (so the normal notmuch-show-mode-map remains).
(let ((mm-inline-text-html-with-w3m-keymap nil))
(notmuch-show-insert-part-*/* msg part content-type nth depth button)))
(notmuch-show-insert-part-*/* msg part content-type nth depth button))))
;; These functions are used by notmuch-show--insert-part-text/html-shr
(declare-function libxml-parse-html-region "xml.c")
(declare-function shr-insert-document "shr")
(defun notmuch-show--insert-part-text/html-shr (msg part)
;; Make sure shr is loaded before we start let-binding its globals
(require 'shr)
(let ((dom (let ((process-crypto notmuch-show-process-crypto))
(with-temp-buffer
(insert (notmuch-get-bodypart-text msg part process-crypto))
(libxml-parse-html-region (point-min) (point-max)))))
(shr-content-function
(lambda (url)
;; shr strips the "cid:" part of URL, but doesn't
;; URL-decode it (see RFC 2392).
(let ((cid (url-unhex-string url)))
(first (notmuch-show--get-cid-content cid)))))
;; Block all external images to prevent privacy leaks and
;; potential attacks. FIXME: If we block an image, offer a
;; button to load external images.
(shr-blocked-images "."))
(shr-insert-document dom)
t))
(defun notmuch-show-insert-part-*/* (msg part content-type nth depth button)
;; This handler _must_ succeed - it is the handler of last resort.