Listing clock time in 'timeline' order

["Giorgos Keramidas" <keramida@ceid.upatras.gr>]

Hi everyone,

I've just started experimenting with clock-in / clock-out for multiple
tasks in an org-mode buffer, and this looks awesome for tracking where
time is spent, how much time was spent on each task, etc.

Being able to report with 'clocktable' the cummulative time spent on
each task is brilliant.

I also used the agenda 'timeline' in the past, especially with tasks
marked as TODO / NEXT.

Now it occured to me that using clock-in/out would be a nice way to
produce timesheet reports, e.g. something that would be able to take two
tasks with multiple clock entries like this:

  * TODO Reading book 'Prescription for Chaos'          :book:scifi:personal:
    CLOCK: [2013-04-07 Sun 17:10]--[2013-04-07 Sun 17:53] =>  0:43
    CLOCK: [2013-04-07 Sun 15:55]--[2013-04-07 Sun 16:08] =>  0:13
    CLOCK: [2013-04-07 Sun 13:58]--[2013-04-07 Sun 14:52] =>  0:54

  * Reading email                                       :personal:email:
    # freebsd-hackers
    CLOCK: [2013-04-07 Sun 23:29]--[2013-04-07 Sun 23:30] =>  0:00
    # emacs-devel
    CLOCK: [2013-04-07 Sun 23:27]--[2013-04-07 Sun 23:28] =>  0:01
    # mercurial-main
    CLOCK: [2013-04-07 Sun 23:26]--[2013-04-07 Sun 23:27] =>  0:01
    # freebsd-current
    CLOCK: [2013-04-07 Sun 23:17]--[2013-04-07 Sun 23:26] =>  0:09
    # freebsd-developers -- deleting old 2010-2012 emails and catching up
    # with unread mail queue.
    CLOCK: [2013-04-07 Sun 23:02]--[2013-04-07 Sun 23:16] =>  0:14
    # freebsd-announce
    CLOCK: [2013-04-07 Sun 23:01]--[2013-04-07 Sun 23:02] =>  0:01
    # freebsd-developers
    CLOCK: [2013-04-07 Sun 14:08]--[2013-04-07 Sun 14:32] =>  0:24
    # freebsd-questions
    CLOCK: [2013-04-07 Sun 14:06]--[2013-04-07 Sun 14:08] =>  0:02
    # emacs-devel
    CLOCK: [2013-04-07 Sun 14:04]--[2013-04-07 Sun 14:06] =>  0:02

and then produce something like clocktable, but with the clock entries
sorted by time instead of added together for each task:

  #+BEGIN: clocksheet :scope file :tgs "+personal"
  Clock timesheet at [2013-04-07 Sun 23:30]

  | Start                | Stop                 | Time | Headline                              |
  |----------------------+----------------------+------+---------------------------------------|
  | 2013-04-07 Sun 13:58 | 2013-04-07 Sun 14:52 | 0:54 | Reading book 'Prescription for Chaos' |
  | 2013-04-07 Sun 14:04 | 2013-04-07 Sun 14:06 | 0:02 | Reading email                         |
  | 2013-04-07 Sun 14:06 | 2013-04-07 Sun 14:08 | 0:02 | Reading email                         |
  | 2013-04-07 Sun 14:08 | 2013-04-07 Sun 14:32 | 0:24 | Reading email                         |
  | 2013-04-07 Sun 15:55 | 2013-04-07 Sun 16:08 | 0:13 | Reading book 'Prescription for Chaos' |
  | 2013-04-07 Sun 17:10 | 2013-04-07 Sun 17:53 | 0:43 | Reading book 'Prescription for Chaos' |
  | 2013-04-07 Sun 23:01 | 2013-04-07 Sun 23:02 | 0:01 | Reading email                         |
  | 2013-04-07 Sun 23:02 | 2013-04-07 Sun 23:16 | 0:14 | Reading email                         |
  | 2013-04-07 Sun 23:17 | 2013-04-07 Sun 23:26 | 0:09 | Reading email                         |
  | 2013-04-07 Sun 23:26 | 2013-04-07 Sun 23:27 | 0:01 | Reading email                         |
  | 2013-04-07 Sun 23:27 | 2013-04-07 Sun 23:28 | 0:01 | Reading email                         |
  | 2013-04-07 Sun 23:29 | 2013-04-07 Sun 23:30 | 0:01 | Reading email                         |
  |----------------------+----------------------+------+---------------------------------------|
  | Total time           |                      |      |                                       |
  #+END:

This would make org-mode an excellent tool e.g. for reporting time sheet
information for projects, even for billing time spent on a project.

Do you think such a feature is possible org-mode?  Does it already exist
in some form?  If not, I'm definitely willing to help implementing it.

- Giorgos