This checks for non-zero exit status from JSON CLI calls and pops up
an error buffer with stderr and stdout.  A consequence of this is that
show and reply now handle errors, rather than ignoring them.
---
 emacs/notmuch-lib.el |   22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index f534770..7f7022a 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -375,15 +375,23 @@ contents of ERR-FILE will be included in the error 
message."
   "Invoke `notmuch-command' with `args' and return the parsed JSON output.
 
 The returned output will represent objects using property lists
-and arrays as lists."
+and arrays as lists.  If notmuch exits with a non-zero status,
+this will pop up a buffer containing notmuch's output and signal
+an error."
 
   (with-temp-buffer
-    (apply #'call-process notmuch-command nil (list t nil) nil args)
-    (goto-char (point-min))
-    (let ((json-object-type 'plist)
-         (json-array-type 'list)
-         (json-false 'nil))
-      (json-read))))
+    (let ((err-file (make-temp-file "nmerr")))
+      (unwind-protect
+         (let ((status (apply #'call-process
+                              notmuch-command nil (list t err-file) nil args)))
+           (notmuch-check-exit-status status (cons notmuch-command args)
+                                      (buffer-string) err-file)
+           (goto-char (point-min))
+           (let ((json-object-type 'plist)
+                 (json-array-type 'list)
+                 (json-false 'nil))
+             (json-read)))
+       (delete-file err-file)))))
 
 ;; Compatibility functions for versions of emacs before emacs 23.
 ;;
-- 
1.7.10.4

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