Re: org table calc and lisp for hh:mm timetable

[Eric S Fraga <e.fraga@ucl.ac.uk>]

Martin Halder <martin.halder@gmail.com> writes:

> Hi all,
>
> some words of warning: this was written by an Emacs, Org, Lisp and
> Calc newbie.. and congratulations on converting a vim user btw, org
> mode is great : )
>
> I was trying to generate a simple table with time format "hh:mm" and
> auto calculate daily sum.. clocking working time was too much so I
> thought this would be easy but ended up with the following.. it works
> but is not beautiful (apply formula twice and same information
> multiple times) and I would like to get rid of the "hms", "hh" and
> "mm" columns and therefore call "hmconcat" directly somehow.. Any help
> is highly appreciated..
>
> Thanks,
> Martin
>
> | Date             | Start | Lunch |  Back |   End |   Sum | hms       | hh | mm |
> |------------------+-------+-------+-------+-------+-------+-----------+----+----|
> | [2011-03-01 Tue] | 08:00 | 12:20 | 13:00 | 17:00 | 08:20 | 8@ 20' 0" |  8 | 20 |
> #+TBLFM: $6='(hmconcat $8 $9)::$7=time(<2010-01-01 $5>)-time(<2010-01-01 $4>)+time(<2010-01-01 $3>)-time(<2010-01-01 $2>)::$8=hour($7)::$9=minute($7)
>
> (defun hmconcat (hh mm) (interactive)
>     (if (> (length hh) 1)
>         (setq temp (concat hh ":")) (setq temp (concat "0" hh ":")))
>     (if (> (length mm) 1)
>         (concat temp mm) (concat temp "0" mm)))

Martin,

glad to see you got further with this!

You can definitely get rid of hmconcat by using a combination of
string-to-number and format (and I'm sure it's possible to get this done
with simpler elisp):

--8<---------------cut here---------------start------------->8---

| Date             | Start | Lunch |  Back |   End |   Sum | hms       | hh | mm |
|------------------+-------+-------+-------+-------+-------+-----------+----+----|
| [2011-03-01 Tue] | 08:00 | 12:20 | 13:00 | 17:00 | 08:20 | 8@ 20' 0" |  8 | 20 |
#+TBLFM: $6='(format "%02d:%02d" (string-to-number $8) (string-to-number $9))::$7=time(<2010-01-01 $5>)-time(<2010-01-01 $4>)+time(<2010-01-01 $3>)-time(<2010-01-01 $2>)::$8=hour($7)::$9=minute($7)
--8<---------------cut here---------------end--------------->8---

-- 
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.50.1
: using Org-mode version 7.5 (release_7.5.52.g0dc16.dirty)