[Rd] Wish List: base::source() + Add Execution Time Argument

[Jim Hester]

R does provide the addTaskCallback / taskCallbackManager to run a
callback function after every top level command. However there is not
an equivalent interface that would be run _before_ each command, which
would make it possible to time of top level calls and provide other
execution measurements.

On Thu, Dec 21, 2017 at 11:31 AM, William Dunlap via R-devel
<r-devel at r-project.org> wrote:
> Is source() the right place for this?  It may be, but we've had customers
> who would like
> this sort of thing done for commands entered by hand.  And there are those
> who want
> a description of any "non-triivial" objects created in .GlobalEnv by each
> expression, ...
> Do they need a way to wrap each expression evaluated in envir=.GlobalEnv
> with a
> function of their choice, one that would print times, datasets created,
> etc.?
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Thu, Dec 21, 2017 at 3:46 AM, Juan Telleria <jtelleriar at gmail.com> wrote:
>
>> Dear R Developers,
>>
>> Adding to source() base function a Timer which indicates the execution time
>> of the source code would be a very well welcome feature, and in my opinion
>> not difficult to implement as an additional funtion argument.
>>
>> The source(timing = TRUE) function shall execute internally the following
>> code for each statement:
>>
>> old <- Sys.time() # get start time at the beginning of source()
>> # source code
>> # print elapsed time
>> new <- Sys.time() - old # calculate difference
>> print(new) # print in nice format
>>
>> Thank you.
>>
>> Kind regards,
>>
>> Juan Telleria
>>
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>>
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