[R logs] Help in develop a simply logs package

Thank. withCallingHandlers() and "pander::evals" seem to be very
interesting, but little adapted to the analysis of one or several
scripts R / of many lines of code. Our goal is one packages requiring no
modifications of code R to be able to get back all the desired
information.

Is-there a hope in seeing R core team adding two options warn and
message with the same features as options(error) ? Or if we try (and
succeed) to code a patch for it, to see it integrating in R ?

I think that it would be very useful.

Benoit

Le 2014-10-07 14:38, Gergely Dar?czi a ?crit :

On Tue, Oct 7, 2014 at 2:21 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:

On 07/10/2014, 7:04 AM, DataK - B. THIEURMEL wrote:

Hi,

With the use of R in production, it is necessary to have a system

of

logs effective, and light.

Package exist as to futile.logger, but it require the additional

coding

of logs. So it is thus impossible / very difficult to use it with

all

package them used in the calculation

Our idea is to develop one packages global, simple, who would

allow to

identify all the errors, warning, message generated by the

functions

stop(), warning() and message() stop as well as by signals and
internally code, with log levels configurable later by package,
functions...

One way is to overwrite temporarily the functions stop(),

warning() and

message() of base package, but I think is not a good thing, and
furthermore, we lose all signals and internally "message"...

A good use of options(error) seems to do the perfect job, but

only for

error...

Our problem / question :
- At present, how it is possible to have the same features for

messages

and warnings? (like options(errors)) (I don't find...)
- Would new options be possible in a near future R ?
- Have there better / other possibilities to handle all the

warnings,

message of the way which we wish?

??withCallingHandlers() lets you evaluate expressions with code
to catch
messages, warnings and errors.

That's exactly what I'm using in "pander::evals" to capture all
error/warning/normal messages while evaluating an R command, and to
also capture the results (as R objects), stdout and the printed
version of the object -- which might be useful in a custom
environment. E.g. I use this function to evaluate all R chunks in
markdown document and also to store all R messages run at the
rapporter.net [2] API. Please let me know if anyone is interested, and
I will start cleaning up the related codebase and publish on GH --
although "pander" and "evals" is already
there: https://github.com/Rapporter/pander [3]

Quick demo: http://pastebin.com/jCUkgKim [4]

I don't know if there's a way to evaluate every expression entered
at
the console within withCallingHandlers() for an effect like
options(error=), but you can certainly write code to read a file
and
evaluate every expression in it within a withCallingHandlers()
call.

Duncan Murdoch

Hope is clear. Open to any suggestions.

Thank you in advance

Links:
------
[1] https://stat.ethz.ch/mailman/listinfo/r-devel
[2] http://rapporter.net
[3] https://github.com/Rapporter/pander
[4] http://pastebin.com/jCUkgKim