---
 emacs/notmuch-crypto.el | 96 +++++++++++++++++++++++++------------------------
 1 file changed, 50 insertions(+), 46 deletions(-)

diff --git a/emacs/notmuch-crypto.el b/emacs/notmuch-crypto.el
index ddb447a6..81c0eca0 100644
--- a/emacs/notmuch-crypto.el
+++ b/emacs/notmuch-crypto.el
@@ -96,36 +96,40 @@ mode."
   :supertype 'notmuch-button-type)
 
 (defun notmuch-crypto-insert-sigstatus-button (sigstatus from)
+  "Insert a button describing the signature status SIGSTATUS sent
+by user FROM."
   (let* ((status (plist-get sigstatus :status))
-        (help-msg nil)
-        (label "Signature not processed")
         (face 'notmuch-crypto-signature-unknown)
-        (button-action (lambda (button) (message (button-get button 
'help-echo)))))
+        (button-action (lambda (button) (message (button-get button 
'help-echo))))
+        (keyid (concat "0x" (plist-get sigstatus :keyid)))
+        label help-msg)
     (cond
      ((string= status "good")
-      (let ((fingerprint (concat "0x" (plist-get sigstatus :fingerprint))))
-       ;; if userid present, userid has full or greater validity
-       (if (plist-member sigstatus :userid)
-           (let ((userid (plist-get sigstatus :userid)))
-             (setq label (concat "Good signature by: " userid))
-             (setq face 'notmuch-crypto-signature-good))
-         (progn
-           (setq label (concat "Good signature by key: " fingerprint))
-           (setq face 'notmuch-crypto-signature-good-key)))
-       (setq button-action 'notmuch-crypto-sigstatus-good-callback)
-       (setq help-msg (concat "Click to list key ID 0x" fingerprint "."))))
+      (let ((fingerprint (concat "0x" (plist-get sigstatus :fingerprint)))
+           (userid (plist-get sigstatus :userid)))
+       ;; If userid is present it has full or greater validity.
+       (if userid
+           (setq label (concat "Good signature by: " userid)
+                 face 'notmuch-crypto-signature-good)
+         (setq label (concat "Good signature by key: " fingerprint)
+               face 'notmuch-crypto-signature-good-key))
+       (setq button-action 'notmuch-crypto-sigstatus-good-callback
+             help-msg (concat "Click to list key ID 0x" fingerprint "."))))
+
      ((string= status "error")
-      (let ((keyid (concat "0x" (plist-get sigstatus :keyid))))
-       (setq label (concat "Unknown key ID " keyid " or unsupported 
algorithm"))
-       (setq button-action 'notmuch-crypto-sigstatus-error-callback)
-       (setq help-msg (concat "Click to retrieve key ID " keyid " from 
keyserver and redisplay."))))
+      (setq label (concat "Unknown key ID " keyid " or unsupported algorithm")
+           button-action 'notmuch-crypto-sigstatus-error-callback
+           help-msg (concat "Click to retrieve key ID " keyid
+                            " from keyserver and redisplay.")))
+
      ((string= status "bad")
-      (let ((keyid (concat "0x" (plist-get sigstatus :keyid))))
-       (setq label (concat "Bad signature (claimed key ID " keyid ")"))
-       (setq face 'notmuch-crypto-signature-bad)))
+      (setq label (concat "Bad signature (claimed key ID " keyid ")")
+           face 'notmuch-crypto-signature-bad))
+
      (t
       (setq label (concat "Unknown signature status"
                          (if status (concat ": " status))))))
+
     (insert-button
      (concat "[ " label " ]")
      :type 'notmuch-crypto-status-button-type
@@ -134,22 +138,22 @@ mode."
      'mouse-face face
      'action button-action
      :notmuch-sigstatus sigstatus
-     :notmuch-from from)
-    (insert "\n")))
-
-(declare-function notmuch-show-refresh-view "notmuch-show" (&optional 
reset-state))
+     :notmuch-from from))
+  (insert "\n"))
 
 (defun notmuch-crypto-sigstatus-good-callback (button)
   (let* ((sigstatus (button-get button :notmuch-sigstatus))
         (fingerprint (concat "0x" (plist-get sigstatus :fingerprint)))
         (buffer (get-buffer-create "*notmuch-crypto-gpg-out*"))
-        (window (display-buffer buffer t nil)))
+        (window (display-buffer buffer)))
     (with-selected-window window
       (with-current-buffer buffer
        (goto-char (point-max))
        (call-process epg-gpg-program nil t t "--list-keys" fingerprint))
       (recenter -1))))
 
+(declare-function notmuch-show-refresh-view "notmuch-show" (&optional 
reset-state))
+
 (defun notmuch-crypto--async-key-sentinel (process event)
   "When the user asks for a GPG key to be retrieved
 asynchronously, handle completion of that task."
@@ -187,6 +191,8 @@ asynchronously, handle completion of that task."
       (insert label))))
 
 (defun notmuch-crypto-sigstatus-error-callback (button)
+  "When signature validation has failed, try to retrieve the
+corresponding key when the status button is pressed."
   (let* ((sigstatus (button-get button :notmuch-sigstatus))
         (keyid (concat "0x" (plist-get sigstatus :keyid)))
         (buffer (get-buffer-create "*notmuch-crypto-gpg-out*")))
@@ -208,7 +214,7 @@ asynchronously, handle completion of that task."
            (process-put p :notmuch-show-point (point))
            (message "Getting the GPG key %s asynchronously..." keyid)
            (continue-process p)))
-      (let ((window (display-buffer buffer t nil)))
+      (let ((window (display-buffer buffer)))
        (with-selected-window window
          (with-current-buffer buffer
            (goto-char (point-max))
@@ -219,25 +225,23 @@ asynchronously, handle completion of that task."
        (notmuch-show-refresh-view)))))
 
 (defun notmuch-crypto-insert-encstatus-button (encstatus)
-  (let* ((status (plist-get encstatus :status))
-        (help-msg nil)
-        (label "Decryption not attempted")
-        (face 'notmuch-crypto-decryption))
-    (cond
-     ((string= status "good")
-      (setq label "Decryption successful"))
-     ((string= status "bad")
-      (setq label "Decryption error"))
-     (t
-      (setq label (concat "Unknown encryption status"
-                         (if status (concat ": " status))))))
-    (insert-button
-     (concat "[ " label " ]")
-     :type 'notmuch-crypto-status-button-type
-     'help-echo help-msg
-     'face face
-     'mouse-face face)
-    (insert "\n")))
+  "Insert a button describing the encryption status ENCSTATUS."
+  (insert-button
+   (concat "[ "
+          (let ((status (plist-get encstatus :status)))
+            (cond
+             ((string= status "good")
+              "Decryption successful")
+             ((string= status "bad")
+              "Decryption error")
+             (t
+              (concat "Unknown encryption status"
+                      (if status (concat ": " status))))))
+          " ]")
+   :type 'notmuch-crypto-status-button-type
+   'face 'notmuch-crypto-decryption
+   'mouse-face 'notmuch-crypto-decryption)
+  (insert "\n"))
 
 ;;
 
-- 
2.11.0

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