Thanks for help on this!
Here is the last version of the patch taking into account all of your comments.


2015-05-01 10:47 GMT+02:00 Nicolas Goaziou <mail@nicolasgoaziou.fr>:
> Hello,
>
> Brice Waegenire <brice.wge@gmail.com> writes:
>
>> I have took in consideration all of your points, is it better now?
>> The current patch doesn't overwrite the present behavior of
>> org-set-timer it only add the possibility to use hh:mm:ss format.
>
> Thank you.
>
> Some comments follow in addition to Kyle's.
>
>> From: Brice Waegeneire <brice.wge@gmail.com>
>> Date: Fri, 24 Apr 2015 14:18:45 +0200
>> Subject: [PATCH] org-timer.el: hh:mm:ss format for setting a timer
>>
>> * lisp/org-timer.el (org-timer-set-timer): Add support for hh:mm:ss format.
>>
>> * testing/lisp/test-org-timer.el (test-org-timer/set-timer): Add
>> hh:mm:ss format in the test.
>
> Commit message is incomplete, i.e., you changed default value for
> `org-timer-default-timer'.
>
>> ---
>>  lisp/org-timer.el              | 23 ++++++++++++-----------
>>  testing/lisp/test-org-timer.el |  8 ++++++++
>>  2 files changed, 20 insertions(+), 11 deletions(-)
>>
>> diff --git a/lisp/org-timer.el b/lisp/org-timer.el
>> index 0593573..022125f 100644
>> --- a/lisp/org-timer.el
>> +++ b/lisp/org-timer.el
>> @@ -65,12 +65,12 @@ the value of the timer."
>>    :group 'org-time
>>    :type 'string)
>>
>> -(defcustom org-timer-default-timer 0
>> -  "The default timer when a timer is set.
>> +(defcustom org-timer-default-timer "0"
>> +  "The default timer when a timer is set, in minutes or hh:mm:ss format.
>>  When 0, the user is prompted for a value."
>>    :group 'org-time
>>    :version "24.1"
>> -  :type 'number)
>> +  :type 'string)
>
> Since you change default value, you need to update keywords:
>
>   :version "25.1"
>   :package-version '(Org . "8.3")
>
>> +                  (and (listp opt) (not (null opt)) org-timer-default-timer)
>
>   (and (consp opt) org-timer-default-timer)
>
>>                    (read-from-minibuffer
>> -                   "How many minutes left? "
>> +                   "How much time left? (minutes or h:mm:ss) "
>>                     (if (not (eq org-timer-default-timer 0))
>> -                       (number-to-string org-timer-default-timer))))))
>> +                       (eval org-timer-default-timer))))))
>> +    (if (string-match "^[0-9]+$" minutes)
>> +     (setq minutes (concat minutes ":00")))
>
>   Nitpick: "\\`[0-9]+\\'"
>
>>      (if (not (string-match "[0-9]+" minutes))
>>       (org-timer-show-remaining-time)
>> -      (let* ((mins (string-to-number (match-string 0 minutes)))
>> -          (secs (* mins 60))
>> +      (let* ((secs (org-timer-hms-to-secs (org-timer-fix-incomplete minutes)))
>
>   let* -> let
>
>
> Regards,
>
> --
> Nicolas Goaziou