emacs: functions to import sender or recipient into BBDB

From a show buffer, notmuch-bbdb/snarf-from imports the sender into
bbdb.  notmuch-bbdb/snarf-to imports all recipients.  Newly imported
contacts are reported in the minibuffer / Messages buffer.

Both functions use the BBDB parser to recognize email address formats.

emacs/notmuch-address.el

@@ -96,6 +96,47 @@ line."
 (when (notmuch-address-locate-command notmuch-address-command)
   (notmuch-address-message-insinuate))
 
+;; functions to add sender / recipients to BBDB
+
+(defun notmuch-bbdb/snarf-headers (headers)
+  ;; Helper function to avoid code duplication in the two below
+  ;; headers should have the same format as bbdb-get-addresses-headers
+
+  ;; bbdb-get-addresses reads these
+  ;; Ugh, pass-by-global
+  (let ((addrs (bbdb-get-addresses nil nil 'notmuch-bbdb/get-header-content))
+	(bbdb-get-addresses-headers headers) ; headers to read
+	(bbdb-gag-messages t)) ; suppress m/n processed message)
+    (bbdb-update-records addrs t t))
+
+  (defun notmuch-bbdb/snarf-from ()
+    "Import the sender of the current message into BBDB"
+    (interactive)
+    (notmuch-bbdb/snarf-headers
+     (list (assoc 'authors bbdb-get-addresses-headers))))
+
+(defun notmuch-bbdb/snarf-to ()
+  "Import all recipients of the current message into BBDB"
+  (interactive)
+  (notmuch-bbdb/snarf-headers
+   (list (assoc 'recipients bbdb-get-addresses-headers))))
+
+(defvar notmuch-bbdb/header-by-name
+  ;; both are case sensitive
+  '( ("From" . :From)
+     ("To" . :To)
+     ("CC" . :Cc)
+     ("BCC" . :Bcc)
+     ("Resent-From" . nil)
+     ("Reply-To" . nil)
+     ("Resent-To" . nil)
+     ("Resent-CC" . nil))
+  "Alist for dispatching header symbols as used by notmuch-show-get-header
+from strings as used by bbdb-get-addresses")
+
+(defun notmuch-bbdb/get-header-content (name)
+  (notmuch-show-get-header (cdr (assoc name notmuch-bbdb/header-by-name))))
+
 ;;
 
 (provide 'notmuch-address)