[Rd] A couple of suggestions: source function (package base)

[Gabor Grothendieck]

I would find that useful too particularly for running long output from Stangle.

On Mon, Sep 21, 2009 at 9:22 PM, Jose Claudio Faria
<joseclaudio.faria at gmail.com> wrote:
> Hi,
>
> I've been calling the function "source" (package base) from Tinn-R editor to
> send files, marked blocks and selections to R interpreter because it avoids a
> lot of problems related with input/output synchronization in the Rgui output!
>
> The new RGedit plugin is also using this function in this way, and we are
> finishing a new version of a plugin to Vim (Vim-R-plugin2) which uses
> also source().
>
> So, I would like to propose two small changes in this function:
>
> 1. The "max.deparse" parameter could be a global option with 150 as
> the default value.
>
>   Why? It will avoid the need to send this parameter repeatedly,
> which causes visual pollution in the console.
>
> 2. A new parameter (for example: "new.line") to allow the user to
> define whether a new blank line between the output and the subsequent
> input is desired when "echo=T".
>
> Example, suppose I have in the editor the three lines below:
>
> a=rnorm(10)
> a
> sort(a)
>
> and I would like to send it to R interpreter (file, block or selection).
>
> The current output is (using Vim-R-plugin2):
> -------------------------------------------
>> source('/tmp/.Rsource-jcfaria', echo=TRUE, max.deparse=50)
>
>> a=rnorm(10)
>
>> a
>  [1]  0.08648104 -1.74996635  0.61027538  0.42042031 -0.02025884 -0.39891256
>  [7] -0.30219635 -0.84476668  1.06341674 -0.12030620
>
>> sort(a)
>  [1] -1.74996635 -0.84476668 -0.39891256 -0.30219635 -0.12030620 -0.02025884
>  [7]  0.08648104  0.42042031  0.61027538  1.06341674
>
>>
>
>
> How it could be (desired):
> -------------------------
>> source('/tmp/.Rsource-jcfaria', echo=TRUE)
>> a=rnorm(10)
>> a
>  [1]  0.08648104 -1.74996635  0.61027538  0.42042031 -0.02025884 -0.39891256
>  [7] -0.30219635 -0.84476668  1.06341674 -0.12030620
>> sort(a)
>  [1] -1.74996635 -0.84476668 -0.39891256 -0.30219635 -0.12030620 -0.02025884
>  [7]  0.08648104  0.42042031  0.61027538  1.06341674
>>
>
> I think that both "new.line" and "max.deparse" could be both global options.
>
> max.deparse = 150 (default)
> new.line    = FALSE (default)
>
> Why? To get a clearer output.
>
> In this way the args of this function would become:
> ---------------------------------------------------
> function (file, local = FALSE, echo = verbose, print.eval = echo,
>    verbose = getOption("verbose"), prompt.echo = getOption("prompt"),
> ->  max.deparse.length = getOption("max.deparse"), new.line =
> getOption("new.line"), <-
>    chdir = FALSE, encoding = getOption("encoding"), continue.echo =
> getOption("continue"),
>    skip.echo = 0, keep.source = getOption("keep.source"))
>
> For GUI/Editor developers this changes will allow to send simpler
> instructions and
> make nice and standard interfaces.
>
> Is it possible to create the "new.line" argument and to put it and
> "max.deparse" between the global options?
>
> I would prefer not creating a custom version of source() because I
> think that these changes would be of
> benefit to other people and projects.
>
> Thanks,
> --
> ///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
> Jose Claudio Faria
> Estatistica - prof. Titular
> UESC/DCET/Brasil
> joseclaudio.faria at gmail.com
> joseclaudio.faria at terra.com.br
> ///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
>
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