Emacs: sorting contacts by timestamp

Last September, I started automatically tracking my e-mails. Every time I sent a message to someone already in my addressbook, his or her contact record would be updated with the date and subject of the message. I also made it easy to note that I met someone in person or that I talked to them on the phone, although this wasn't automatic.

So now I have almost a year of contact information in my address book. I was curious—whom haven't I talked to in a year?

Here are some numbers:

I've contacted 396 people in my addressbook since January 1, 2007.

In the past 365 days (2006.09.07 - 2007.09.07), I've contacted 670 people in my address book.

93 people have a contact timestamp (maybe the day I met them), but I haven't contacted them in the past 365 days. This breaks down to 37 people I haven't contacted since 2006, 32 people I haven't contacted since 2005, and 24 from 2004 or earlier.

1230 records do not have any contact timestamp. Some of these are bots, some of these are duplicate records I still haven't gotten around to merging, others are contacts from before I started tracking and I haven't e-mailed or talked to them since.

I figured this out by writing a bit of Emacs Lisp to print a hyperlinked list of contacts with the date of last contact. This was then very easy to sort using M-x sort-lines and M-x reverse-region.

For example, here are the people I've e-mailed in the last seven days:

2007.09.07 Wayne Young 2007.09.07 Tania Samsonova 2007.09.07 Papa 2007.09.07 Mike Bailey 2007.09.07 Mama 2007.09.07 Leigh Honeywell 2007.09.07 Lawrence J. Rooney 2007.09.07 Kathy Chua 2007.09.07 Don Marti 2007.09.07 Dean Michael Berris 2007.09.07 Ching Valdezco 2007.09.07 Bill Pollock 2007.09.06 Peppy Salita 2007.09.06 Mallory Chua 2007.09.06 John Sullivan 2007.09.06 Clair Ching 2007.09.06 Allan Tan 2007.09.05 Mark Chignell 2007.09.04 Gabriel Mansour 2007.09.03 Thomas Knoll 2007.09.03 Simon Ditner 2007.09.03 Richard Plana 2007.09.03 Neil Ernst 2007.09.03 Mike C. Fletcher 2007.09.03 Michal Jacovi 2007.09.03 Michael J. Muller 2007.09.03 Eugene Jarder 2007.08.31 Simon Rowland 2007.08.31 Jay Goldman

The code below probably won't work out of the box with you unless you're using Planner+BBDB+my mail tracking hacks, but maybe it'll give you ideas.

(defun sacha/bbdb-print-with-timestamp (records)
  (while records
    (insert (sacha/bbdb-last-timestamp (car records))
            " |\t"
            (or (sacha/planner-bbdb-annotation-from-bbdb records) "")
    (setq records (cdr records))))

;; (assert (equal (sacha/extract-regexp "a." "ab ac bb") '("ab" "ac")))
(defun sacha/extract-regexp (regexp string &optional group)
  (let (result
        (start 0))
    (while (string-match regexp string start)
      (setq result (cons (match-string (or group 0) string) result))
      (setq start (match-end 0)))
    (nreverse result)))

(defun sacha/bbdb-timestamps (rec)
  "Return a list of timestamps found in the notes or contact field of REC."
   (sacha/extract-regexp planner-date-regexp
                         (concat (or (bbdb-record-notes rec) "")
                                 " "
                                 (bbdb-record-getprop rec 'contact)))
   (lambda (a b) (string< b a))))

(defun sacha/bbdb-last-timestamp (rec)
  "Return the most recent timestamp for REC or nil if none."
  (or (car (sacha/bbdb-timestamps rec)) "0000.00.00"))

Yes, I do weird things. Next step for this one: Review the list, see who I haven't talked to in one year, and decide who I want to get back in touch with. Also, analyze my e-mail and come up with pretty graphs.

Random Emacs symbol: gnus-server-kill-server - Command: Kill the server on the current line.