+(defun notmuch-escape-boolean-term (term)
+ "Escape a boolean term for use in a query.
+
+The caller is responsible for prepending the term prefix and a
+colon. This performs minimal escaping in order to produce
+user-friendly queries."
+
+ (save-match-data
+ (if (or (equal term "")
+ (string-match "[ ()]\\|^\"" term))
+ ;; Requires escaping
+ (concat "\"" (replace-regexp-in-string "\"" "\"\"" term t t) "\"")
+ term)))
+