[PATCH v2 1/2] emacs: support defining a list of alternative parts to show

[Jani Nikula <jani@nikula.org>]

Make notmuch-show-all-multipart/alternative-parts accept a list of
regexps to match the part types to determine which parts to show in
addition to the preferred types. This allows the user to force display
some alternative part types while normally showing just the preferred
ones.

Signed-off-by: Jani Nikula <jani@nikula.org>
---
 emacs/notmuch-show.el |   23 ++++++++++++++++++-----
 1 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 24fde05..5f643f1 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -94,10 +94,20 @@ any given message."
   :group 'notmuch-show
   :group 'notmuch-hooks)
 
-;; Mostly useful for debugging.
 (defcustom notmuch-show-all-multipart/alternative-parts t
-  "Should all parts of multipart/alternative parts be shown?"
-  :type 'boolean
+  "Which parts of multipart/alternative should be shown?
+
+This variable determines which parts of multipart/alternative
+should be displayed. Set to t (the default) to show all
+parts. Set to nil to only show the preferred parts. Set to a list
+of regexps to display the preferred parts, and parts matching any
+of the regexps, for example:
+
+ (setq notmuch-show-all-multipart/alternative-parts
+      '(\"text/.*calendar\" \"text/html\"))"
+  :type '(choice (const :tag "Show all parts" t)
+		 (const :tag "Show preferred parts" nil)
+		 (repeat :tag "Show preferred and parts matching regexps" string))
   :group 'notmuch-show)
 
 (defcustom notmuch-show-indent-messages-width 1
@@ -513,8 +523,11 @@ current buffer, if possible."
     ;; should be chosen if there are more than one that match?
     (mapc (lambda (inner-part)
 	    (let ((inner-type (plist-get inner-part :content-type)))
-	      (if (or notmuch-show-all-multipart/alternative-parts
-		      (string= chosen-type inner-type))
+	      (if (or (equal notmuch-show-all-multipart/alternative-parts t)
+		      (string= chosen-type inner-type)
+		      (and
+		       notmuch-show-all-multipart/alternative-parts
+		       (equal (string-match-p (mapconcat (lambda (s) (format "^%s$" s)) notmuch-show-all-multipart/alternative-parts "\\|") inner-type) 0)))
 		  (notmuch-show-insert-bodypart msg inner-part depth)
 		(notmuch-show-insert-part-header (plist-get inner-part :id) inner-type inner-type nil " (not shown)"))))
 	  inner-parts)
-- 
1.7.1