Less code, same results, without sacrificing readability.

---
 emacs/notmuch-show.el |   20 +++++++++-----------
 emacs/notmuch-wash.el |   47 +++++++++++++++++++++++------------------------
 emacs/notmuch.el      |   28 +++++++++++++---------------
 3 files changed, 45 insertions(+), 50 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 0cbf354..1e190ae 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1226,11 +1226,10 @@ any effects from previous calls to
       ;; If a small number of lines from the previous message are
       ;; visible, realign so that the top of the current message is at
       ;; the top of the screen.
-      (if (<= (count-screen-lines (window-start) start-of-message)
-             next-screen-context-lines)
-         (progn
-           (goto-char (notmuch-show-message-top))
-           (notmuch-show-message-adjust)))
+      (when (<= (count-screen-lines (window-start) start-of-message)
+               next-screen-context-lines)
+       (goto-char (notmuch-show-message-top))
+       (notmuch-show-message-adjust))
       ;; Move to the top left of the window.
       (goto-char (window-start)))
      (t
@@ -1423,12 +1422,11 @@ argument, hide all of the messages."
   ;; Move to the next item in the search results, if any.
   (let ((parent-buffer notmuch-show-parent-buffer))
     (notmuch-kill-this-buffer)
-    (if parent-buffer
-       (progn
-         (switch-to-buffer parent-buffer)
-         (forward-line)
-         (if show-next
-             (notmuch-search-show-thread))))))
+    (when parent-buffer
+      (switch-to-buffer parent-buffer)
+      (forward-line)
+      (if show-next
+         (notmuch-search-show-thread)))))

 (defun notmuch-show-archive-thread ()
   "Archive each message in thread, then show next thread from search.
diff --git a/emacs/notmuch-wash.el b/emacs/notmuch-wash.el
index 5c1e830..67143e5 100644
--- a/emacs/notmuch-wash.el
+++ b/emacs/notmuch-wash.el
@@ -336,30 +336,29 @@ patch and then guesses the extent of the patch, there is 
scope
 for error."

   (goto-char (point-min))
-  (if (re-search-forward diff-file-header-re nil t)
-      (progn
-       (beginning-of-line -1)
-       (let ((patch-start (point))
-             (patch-end (point-max))
-             part)
-         (goto-char patch-start)
-         (if (or
-              ;; Patch ends with signature.
-              (re-search-forward notmuch-wash-signature-regexp nil t)
-              ;; Patch ends with bugtraq comment.
-              (re-search-forward "^\\*\\*\\* " nil t))
-             (setq patch-end (match-beginning 0)))
-         (save-restriction
-           (narrow-to-region patch-start patch-end)
-           (setq part (plist-put part :content-type "inline-patch-fake-part"))
-           (setq part (plist-put part :content (buffer-string)))
-           (setq part (plist-put part :id -1))
-           (setq part (plist-put part :filename
-                                 (notmuch-wash-subject-to-patch-filename
-                                  (plist-get
-                                   (plist-get msg :headers) :Subject))))
-           (delete-region (point-min) (point-max))
-           (notmuch-show-insert-bodypart nil part depth))))))
+  (when (re-search-forward diff-file-header-re nil t)
+    (beginning-of-line -1)
+    (let ((patch-start (point))
+         (patch-end (point-max))
+         part)
+      (goto-char patch-start)
+      (if (or
+          ;; Patch ends with signature.
+          (re-search-forward notmuch-wash-signature-regexp nil t)
+          ;; Patch ends with bugtraq comment.
+          (re-search-forward "^\\*\\*\\* " nil t))
+         (setq patch-end (match-beginning 0)))
+      (save-restriction
+       (narrow-to-region patch-start patch-end)
+       (setq part (plist-put part :content-type "inline-patch-fake-part"))
+       (setq part (plist-put part :content (buffer-string)))
+       (setq part (plist-put part :id -1))
+       (setq part (plist-put part :filename
+                             (notmuch-wash-subject-to-patch-filename
+                              (plist-get
+                               (plist-get msg :headers) :Subject))))
+       (delete-region (point-min) (point-max))
+       (notmuch-show-insert-bodypart nil part depth)))))

 ;;

diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index ba84494..0d37a74 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -631,17 +631,16 @@ This function advances the next thread when finished."
                  (goto-char (point-max))
                  (if (eq status 'signal)
                      (insert "Incomplete search results (search process was 
killed).\n"))
-                 (if (eq status 'exit)
-                     (progn
-                       (if notmuch-search-process-filter-data
-                           (insert (concat "Error: Unexpected output from 
notmuch search:\n" notmuch-search-process-filter-data)))
-                       (insert "End of search results.")
-                       (unless (= exit-status 0)
-                         (insert (format " (process returned %d)" 
exit-status)))
-                       (insert "\n")
-                       (if (and atbob
-                                (not (string= notmuch-search-target-thread 
"found")))
-                           (set 'never-found-target-thread t))))))
+                 (when (eq status 'exit)
+                   (if notmuch-search-process-filter-data
+                       (insert (concat "Error: Unexpected output from notmuch 
search:\n" notmuch-search-process-filter-data)))
+                   (insert "End of search results.")
+                   (unless (= exit-status 0)
+                     (insert (format " (process returned %d)" exit-status)))
+                   (insert "\n")
+                   (if (and atbob
+                            (not (string= notmuch-search-target-thread 
"found")))
+                       (set 'never-found-target-thread t)))))
              (when (and never-found-target-thread
                       notmuch-search-target-line)
                  (goto-char (point-min))
@@ -818,10 +817,9 @@ non-authors is found, assume that all of the authors 
match."
                        (put-text-property beg (point) 
'notmuch-search-thread-id thread-id)
                        (put-text-property beg (point) 'notmuch-search-authors 
authors)
                        (put-text-property beg (point) 'notmuch-search-subject 
subject)
-                       (if (string= thread-id notmuch-search-target-thread)
-                           (progn
-                             (set 'found-target beg)
-                             (set 'notmuch-search-target-thread "found"))))
+                       (when (string= thread-id notmuch-search-target-thread)
+                         (set 'found-target beg)
+                         (set 'notmuch-search-target-thread "found")))
                      (set 'line (match-end 0)))
                  (set 'more nil)
                  (while (and (< line (length string)) (= (elt string line) 
?\n))
-- 
1.7.8.1

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