+(defun notmuch-parts-filter-by-type (parts type)
+ "Given a list of message parts, return a list containing the ones matching
+the given type."
+ (remove-if-not
+ (lambda (part) (notmuch-match-content-type (plist-get part :content-type) type))
+ parts))
+
+;; Helper for parts which are generally not included in the default
+;; SEXP output.
+(defun notmuch-get-bodypart-internal (query part-number process-crypto)
+ (let ((args '("show" "--format=raw"))
+ (part-arg (format "--part=%s" part-number)))
+ (setq args (append args (list part-arg)))
+ (if process-crypto
+ (setq args (append args '("--decrypt"))))
+ (setq args (append args (list query)))
+ (with-temp-buffer
+ (let ((coding-system-for-read 'no-conversion))
+ (progn
+ (apply 'call-process (append (list notmuch-command nil (list t nil) nil) args))
+ (buffer-string))))))
+
+(defun notmuch-get-bodypart-content (msg part nth process-crypto)
+ (or (plist-get part :content)
+ (notmuch-get-bodypart-internal (notmuch-id-to-query (plist-get msg :id)) nth process-crypto)))
+
+;; Workaround: The call to `mm-display-part' below triggers a bug in
+;; Emacs 24 if it attempts to use the shr renderer to display an HTML
+;; part with images in it (demonstrated in 24.1 and 24.2 on Debian and
+;; Fedora 17, though unreproducable in other configurations).
+;; `mm-shr' references the variable `gnus-inhibit-images' without
+;; first loading gnus-art, which defines it, resulting in a
+;; void-variable error. Hence, we advise `mm-shr' to ensure gnus-art
+;; is loaded.
+(if (>= emacs-major-version 24)
+ (defadvice mm-shr (before load-gnus-arts activate)
+ (require 'gnus-art nil t)
+ (ad-disable-advice 'mm-shr 'before 'load-gnus-arts)
+ (ad-activate 'mm-shr)))
+
+(defun notmuch-mm-display-part-inline (msg part nth content-type process-crypto)
+ "Use the mm-decode/mm-view functions to display a part in the
+current buffer, if possible."
+ (let ((display-buffer (current-buffer)))
+ (with-temp-buffer
+ ;; In case there is :content, the content string is already converted
+ ;; into emacs internal format. `gnus-decoded' is a fake charset,
+ ;; which means no further decoding (to be done by mm- functions).
+ (let* ((charset (if (plist-member part :content)
+ 'gnus-decoded
+ (plist-get part :content-charset)))
+ (handle (mm-make-handle (current-buffer) `(,content-type (charset . ,charset)))))
+ ;; If the user wants the part inlined, insert the content and
+ ;; test whether we are able to inline it (which includes both
+ ;; capability and suitability tests).
+ (when (mm-inlined-p handle)
+ (insert (notmuch-get-bodypart-content msg part nth process-crypto))
+ (when (mm-inlinable-p handle)
+ (set-buffer display-buffer)
+ (mm-display-part handle)
+ t))))))
+
+;; Converts a plist of headers to an alist of headers. The input plist should
+;; have symbols of the form :Header as keys, and the resulting alist will have
+;; symbols of the form 'Header as keys.
+(defun notmuch-headers-plist-to-alist (plist)
+ (loop for (key value . rest) on plist by #'cddr
+ collect (cons (intern (substring (symbol-name key) 1)) value)))
+
+(defun notmuch-face-ensure-list-form (face)
+ "Return FACE in face list form.
+
+If FACE is already a face list, it will be returned as-is. If
+FACE is a face name or face plist, it will be returned as a
+single element face list."
+ (if (and (listp face) (not (keywordp (car face))))
+ face
+ (list face)))
+
+(defun notmuch-apply-face (object face &optional below start end)
+ "Combine FACE into the 'face text property of OBJECT between START and END.
+
+This function combines FACE with any existing faces between START
+and END in OBJECT. Attributes specified by FACE take precedence
+over existing attributes unless BELOW is non-nil.
+
+OBJECT may be a string, a buffer, or nil (which means the current
+buffer). If object is a string, START and END are 0-based;
+otherwise they are buffer positions (integers or markers). FACE
+must be a face name (a symbol or string), a property list of face
+attributes, or a list of these. If START and/or END are omitted,
+they default to the beginning/end of OBJECT. For convenience
+when applied to strings, this returns OBJECT."
+
+ ;; A face property can have three forms: a face name (a string or
+ ;; symbol), a property list, or a list of these two forms. In the
+ ;; list case, the faces will be combined, with the earlier faces
+ ;; taking precedent. Here we canonicalize everything to list form
+ ;; to make it easy to combine.
+ (let ((pos (cond (start start)
+ ((stringp object) 0)
+ (t 1)))
+ (end (cond (end end)
+ ((stringp object) (length object))
+ (t (1+ (buffer-size object)))))
+ (face-list (notmuch-face-ensure-list-form face)))
+ (while (< pos end)
+ (let* ((cur (get-text-property pos 'face object))
+ (cur-list (notmuch-face-ensure-list-form cur))
+ (new (cond ((null cur-list) face)
+ (below (append cur-list face-list))
+ (t (append face-list cur-list))))
+ (next (next-single-property-change pos 'face object end)))
+ (put-text-property pos next 'face new object)
+ (setq pos next))))
+ object)
+
+(defun notmuch-map-text-property (start end prop func &optional object)
+ "Transform text property PROP using FUNC.
+
+Applies FUNC to each distinct value of the text property PROP
+between START and END of OBJECT, setting PROP to the value
+returned by FUNC."
+ (while (< start end)
+ (let ((value (get-text-property start prop object))
+ (next (next-single-property-change start prop object end)))
+ (put-text-property start next prop (funcall func value) object)
+ (setq start next))))
+
+(defun notmuch-logged-error (msg &optional extra)
+ "Log MSG and EXTRA to *Notmuch errors* and signal MSG.
+
+This logs MSG and EXTRA to the *Notmuch errors* buffer and
+signals MSG as an error. If EXTRA is non-nil, text referring the
+user to the *Notmuch errors* buffer will be appended to the
+signaled error. This function does not return."
+
+ (with-current-buffer (get-buffer-create "*Notmuch errors*")
+ (goto-char (point-max))
+ (unless (bobp)
+ (newline))
+ (save-excursion
+ (insert "[" (current-time-string) "]\n" msg)
+ (unless (bolp)
+ (newline))
+ (when extra
+ (insert extra)
+ (unless (bolp)
+ (newline)))))
+ (error "%s" (concat msg (when extra
+ " (see *Notmuch errors* for more details)"))))
+
+(defun notmuch-check-async-exit-status (proc msg &optional command err-file)
+ "If PROC exited abnormally, pop up an error buffer and signal an error.
+
+This is a wrapper around `notmuch-check-exit-status' for
+asynchronous process sentinels. PROC and MSG must be the
+arguments passed to the sentinel. COMMAND and ERR-FILE, if
+provided, are passed to `notmuch-check-exit-status'. If COMMAND
+is not provided, it is taken from `process-command'."
+ (let ((exit-status
+ (case (process-status proc)
+ ((exit) (process-exit-status proc))
+ ((signal) msg))))
+ (when exit-status
+ (notmuch-check-exit-status exit-status (or command (process-command proc))
+ nil err-file))))
+
+(defun notmuch-check-exit-status (exit-status command &optional output err-file)
+ "If EXIT-STATUS is non-zero, pop up an error buffer and signal an error.
+
+If EXIT-STATUS is non-zero, pop up a notmuch error buffer
+describing the error and signal an Elisp error. EXIT-STATUS must
+be a number indicating the exit status code of a process or a
+string describing the signal that terminated the process (such as
+returned by `call-process'). COMMAND must be a list giving the
+command and its arguments. OUTPUT, if provided, is a string
+giving the output of command. ERR-FILE, if provided, is the name
+of a file containing the error output of command. OUTPUT and the
+contents of ERR-FILE will be included in the error message."
+
+ (cond
+ ((eq exit-status 0) t)
+ ((eq exit-status 20)
+ (notmuch-logged-error "notmuch CLI version mismatch
+Emacs requested an older output format than supported by the notmuch CLI.
+You may need to restart Emacs or upgrade your notmuch Emacs package."))
+ ((eq exit-status 21)
+ (notmuch-logged-error "notmuch CLI version mismatch
+Emacs requested a newer output format than supported by the notmuch CLI.
+You may need to restart Emacs or upgrade your notmuch package."))
+ (t
+ (let* ((err (when err-file
+ (with-temp-buffer
+ (insert-file-contents err-file)
+ (unless (eobp)
+ (buffer-string)))))
+ (extra
+ (concat
+ "command: " (mapconcat #'shell-quote-argument command " ") "\n"
+ (if (integerp exit-status)
+ (format "exit status: %s\n" exit-status)
+ (format "exit signal: %s\n" exit-status))
+ (when err
+ (concat "stderr:\n" err))
+ (when output
+ (concat "stdout:\n" output)))))
+ (if err
+ ;; We have an error message straight from the CLI.
+ (notmuch-logged-error
+ (replace-regexp-in-string "[ \n\r\t\f]*\\'" "" err) extra)
+ ;; We only have combined output from the CLI; don't inundate
+ ;; the user with it. Mimic `process-lines'.
+ (notmuch-logged-error (format "%s exited with status %s"
+ (car command) exit-status)
+ extra))
+ ;; `notmuch-logged-error' does not return.
+ ))))
+
+(defun notmuch-call-notmuch--helper (destination args)
+ "Helper for synchronous notmuch invocation commands.
+
+This wraps `call-process'. DESTINATION has the same meaning as
+for `call-process'. ARGS is as described for
+`notmuch-call-notmuch-process'."
+
+ (let (stdin-string)
+ (while (keywordp (car args))
+ (case (car args)
+ (:stdin-string (setq stdin-string (cadr args)
+ args (cddr args)))
+ (otherwise
+ (error "Unknown keyword argument: %s" (car args)))))
+ (if (null stdin-string)
+ (apply #'call-process notmuch-command nil destination nil args)
+ (insert stdin-string)
+ (apply #'call-process-region (point-min) (point-max)
+ notmuch-command t destination nil args))))
+
+(defun notmuch-call-notmuch-process (&rest args)
+ "Synchronously invoke `notmuch-command' with ARGS.
+
+The caller may provide keyword arguments before ARGS. Currently
+supported keyword arguments are:
+
+ :stdin-string STRING - Write STRING to stdin
+
+If notmuch exits with a non-zero status, output from the process
+will appear in a buffer named \"*Notmuch errors*\" and an error
+will be signaled."
+ (with-temp-buffer
+ (let ((status (notmuch-call-notmuch--helper t args)))
+ (notmuch-check-exit-status status (cons notmuch-command args)
+ (buffer-string)))))
+
+(defun notmuch-call-notmuch-sexp (&rest args)
+ "Invoke `notmuch-command' with ARGS and return the parsed S-exp output.
+
+This is equivalent to `notmuch-call-notmuch-process', but parses
+notmuch's output as an S-expression and returns the parsed value.
+Like `notmuch-call-notmuch-process', if notmuch exits with a
+non-zero status, this will report its output and signal an
+error."
+
+ (with-temp-buffer
+ (let ((err-file (make-temp-file "nmerr")))
+ (unwind-protect
+ (let ((status (notmuch-call-notmuch--helper (list t err-file) args)))
+ (notmuch-check-exit-status status (cons notmuch-command args)
+ (buffer-string) err-file)
+ (goto-char (point-min))
+ (read (current-buffer)))
+ (delete-file err-file)))))
+
+(defun notmuch-start-notmuch (name buffer sentinel &rest args)
+ "Start and return an asynchronous notmuch command.
+
+This starts and returns an asynchronous process running
+`notmuch-command' with ARGS. The exit status is checked via
+`notmuch-check-async-exit-status'. Output written to stderr is
+redirected and displayed when the process exits (even if the
+process exits successfully). NAME and BUFFER are the same as in
+`start-process'. SENTINEL is a process sentinel function to call
+when the process exits, or nil for none. The caller must *not*
+invoke `set-process-sentinel' directly on the returned process,
+as that will interfere with the handling of stderr and the exit
+status."
+
+ ;; There is no way (as of Emacs 24.3) to capture stdout and stderr
+ ;; separately for asynchronous processes, or even to redirect stderr
+ ;; to a file, so we use a trivial shell wrapper to send stderr to a
+ ;; temporary file and clean things up in the sentinel.
+ (let* ((err-file (make-temp-file "nmerr"))
+ ;; Use a pipe
+ (process-connection-type nil)
+ ;; Find notmuch using Emacs' `exec-path'
+ (command (or (executable-find notmuch-command)
+ (error "command not found: %s" notmuch-command)))
+ (proc (apply #'start-process name buffer
+ "/bin/sh" "-c"
+ "exec 2>\"$1\"; shift; exec \"$0\" \"$@\""
+ command err-file args)))
+ (process-put proc 'err-file err-file)
+ (process-put proc 'sub-sentinel sentinel)
+ (process-put proc 'real-command (cons notmuch-command args))
+ (set-process-sentinel proc #'notmuch-start-notmuch-sentinel)
+ proc))
+
+(defun notmuch-start-notmuch-sentinel (proc event)
+ (let ((err-file (process-get proc 'err-file))
+ (sub-sentinel (process-get proc 'sub-sentinel))
+ (real-command (process-get proc 'real-command)))
+ (condition-case err
+ (progn
+ ;; Invoke the sub-sentinel, if any
+ (when sub-sentinel
+ (funcall sub-sentinel proc event))
+ ;; Check the exit status. This will signal an error if the
+ ;; exit status is non-zero. Don't do this if the process
+ ;; buffer is dead since that means Emacs killed the process
+ ;; and there's no point in telling the user that (but we
+ ;; still check for and report stderr output below).
+ (when (buffer-live-p (process-buffer proc))
+ (notmuch-check-async-exit-status proc event real-command err-file))
+ ;; If that didn't signal an error, then any error output was
+ ;; really warning output. Show warnings, if any.
+ (let ((warnings
+ (with-temp-buffer
+ (unless (= (second (insert-file-contents err-file)) 0)
+ (end-of-line)
+ ;; Show first line; stuff remaining lines in the
+ ;; errors buffer.
+ (let ((l1 (buffer-substring (point-min) (point))))
+ (skip-chars-forward "\n")
+ (cons l1 (unless (eobp)
+ (buffer-substring (point) (point-max)))))))))
+ (when warnings
+ (notmuch-logged-error (car warnings) (cdr warnings)))))
+ (error
+ ;; Emacs behaves strangely if an error escapes from a sentinel,
+ ;; so turn errors into messages.
+ (message "%s" (error-message-string err))))
+ (ignore-errors (delete-file err-file))))