From: Austin Clements <amdragon@MIT.EDU>
To: notmuch@notmuchmail.org
Subject: [PATCH 08/11] emacs: Support caching in notmuch-get-bodypart-{binary,
	text}
Date: Mon, 21 Apr 2014 14:37:45 -0400
Message-Id: <1398105468-14317-9-git-send-email-amdragon@mit.edu>
In-Reply-To: <1398105468-14317-1-git-send-email-amdragon@mit.edu>
References: <1398105468-14317-1-git-send-email-amdragon@mit.edu>
Precedence: list

(The actual code change here is small, but requires re-indenting
existing code.)
---
 emacs/notmuch-lib.el | 52 ++++++++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 22 deletions(-)

diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index fc67b14..fee8512 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -503,33 +503,39 @@ (defun notmuch-parts-filter-by-type (parts type)
    (lambda (part) (notmuch-match-content-type (plist-get part :content-type) type))
    parts))
 
-(defun notmuch-get-bodypart-binary (msg part process-crypto)
+(defun notmuch-get-bodypart-binary (msg part process-crypto &optional cache)
   "Return the unprocessed content of PART in MSG as a unibyte string.
 
 This returns the \"raw\" content of the given part after content
 transfer decoding, but with no further processing (see the
 discussion of --format=raw in man notmuch-show).  In particular,
 this does no charset conversion."
-  (let ((args `("show" "--format=raw"
-		,(format "--part=%d" (plist-get part :id))
-		,@(when process-crypto '("--decrypt"))
-		,(notmuch-id-to-query (plist-get msg :id)))))
-    (with-temp-buffer
-      ;; Emacs internally uses a UTF-8-like multibyte string
-      ;; representation by default (regardless of the coding system,
-      ;; which only affects how it goes from outside data to this
-      ;; internal representation).  This *almost* never matters.
-      ;; Annoyingly, it does matter if we use this data in an image
-      ;; descriptor, since Emacs will use its internal data buffer
-      ;; directly and this multibyte representation corrupts binary
-      ;; image formats.  Since the caller is asking for binary data, a
-      ;; unibyte string is a more appropriate representation anyway.
-      (set-buffer-multibyte nil)
-      (let ((coding-system-for-read 'no-conversion))
-	(apply #'call-process notmuch-command nil '(t nil) nil args)
-	(buffer-string)))))
-
-(defun notmuch-get-bodypart-text (msg part process-crypto)
+  (let ((data (plist-get part :binary-content)))
+    (when (not data)
+      (let ((args `("show" "--format=raw"
+		    ,(format "--part=%d" (plist-get part :id))
+		    ,@(when process-crypto '("--decrypt"))
+		    ,(notmuch-id-to-query (plist-get msg :id)))))
+	(with-temp-buffer
+	  ;; Emacs internally uses a UTF-8-like multibyte string
+	  ;; representation by default (regardless of the coding
+	  ;; system, which only affects how it goes from outside data
+	  ;; to this internal representation).  This *almost* never
+	  ;; matters.  Annoyingly, it does matter if we use this data
+	  ;; in an image descriptor, since Emacs will use its internal
+	  ;; data buffer directly and this multibyte representation
+	  ;; corrupts binary image formats.  Since the caller is
+	  ;; asking for binary data, a unibyte string is a more
+	  ;; appropriate representation anyway.
+	  (set-buffer-multibyte nil)
+	  (let ((coding-system-for-read 'no-conversion))
+	    (apply #'call-process notmuch-command nil '(t nil) nil args)
+	    (setq data (buffer-string)))))
+      (when cache
+	(plist-put part :binary-content data)))
+    data))
+
+(defun notmuch-get-bodypart-text (msg part process-crypto &optional cache)
   "Return the text content of PART in MSG.
 
 This returns the content of the given part as a multibyte Lisp
@@ -546,7 +552,9 @@ (defun notmuch-get-bodypart-text (msg part process-crypto)
 	     (npart (apply #'notmuch-call-notmuch-sexp args)))
 	(setq content (plist-get npart :content))
 	(when (not content)
-	  (error "Internal error: No :content from %S" args))))
+	  (error "Internal error: No :content from %S" args)))
+      (when cache
+	(plist-put part :content content)))
     content))
 
 ;; Workaround: The call to `mm-display-part' below triggers a bug in
-- 
1.9.1