emacs: update defcustom for notmuch-unthreaded-result-format

This is essentially a copy of that for notmuch-tree-result-format,
aside from the default value.

diff --git a/emacs/notmuch-tree.el b/emacs/notmuch-tree.el
index 686146237623c4cc34d13b3565d3bd8fbc21ed50..f63ac9a518ea43b6b0b62687f05b1f4a77f8cdf7 100644 (file)
--- a/emacs/notmuch-tree.el
+++ b/emacs/notmuch-tree.el
@@ -142,7 +142,11 @@ Note that the author string should not contain whitespace
     ("tags" . "(%s)"))
   "Result formatting for unthreaded tree view.
 
-Supported fields are: date, authors, subject, tree, tags.
+List of pairs of (field . format-string).  Supported field
+strings are: \"date\", \"authors\", \"subject\", \"tree\",
+\"tags\".  It is also supported to pass a function in place of a
+field-name. In this case the function is passed the thread
+object (plist) and format string.
 
 Tree means the thread tree box graphics. The field may
 also be a list in which case the formatting rules are
@@ -150,14 +154,12 @@ applied recursively and then the output of all the fields
 in the list is inserted according to format-string.
 
 Note that the author string should not contain whitespace
-\(put it in the neighbouring fields instead). For example:
-    (setq notmuch-unthreaded-result-format
-          '((\"authors\" . \"%-40s\")
-            (\"subject\" . \"%s\")))"
-  :type '(alist :key-type (choice string
-                                 (alist :key-type string
-                                        :value-type string))
-               :value-type string)
+\(put it in the neighbouring fields instead)."
+
+  :type `(alist :key-type (choice ,notmuch-tree--field-names
+                                 (alist :key-type ,notmuch-tree--field-names
+                                        :value-type (string :tag "Format")))
+               :value-type (string :tag "Format"))
   :group 'notmuch-tree)
 
 (defun notmuch-tree-result-format ()