[R logs] Help in develop a simply logs package
R has support for options(warning.expression=...), but it acts differently than the options(error=...). S (and S+) let the user override the default '.Program' expression. Its default value was essentially print(.Last.value <- eval(parse(file=stdin()))) but a replacement could add stuff like print the time it took to do the evaluation, put errors and warnings into a log file, or even read input expressions from an alternate source. R has some hook functions that let you do some of that, but I don't know how much they let you do. Bill Dunlap TIBCO Software wdunlap tibco.com
On Tue, Oct 7, 2014 at 7:16 AM, DataK - B. THIEURMEL <bt at datak.fr> wrote:
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
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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
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