Re: [Rd] options("quit.with.no.save"), and Windows installer changes

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Wed 05 Jul 2006 - 07:22:51 GMT

On Tue, 4 Jul 2006, Duncan Murdoch wrote:

> On 7/4/2006 11:57 AM, Uwe Ligges wrote:
>> Martin Maechler wrote:

>>>>>>>> "Duncan" == Duncan Murdoch <murdoch@stats.uwo.ca>
>>>>>>>> on Tue, 04 Jul 2006 08:32:08 -0400 writes:
>>> Duncan> I've just committed a couple of changes to R-devel related to requests
>>> Duncan> at userR about the Windows installer. The first of these affects all
>>> Duncan> platforms, but I've only tested it on Windows:
>>>
>>> Duncan> I added an option "quit.with.no.save". If TRUE,
>>> Duncan> then the default q("ask") prompt will not offer to
>>> Duncan> save the workspace. This is in response to the
>>> Duncan> observation that new users who are instructed not to
>>> Duncan> save their workspace, get confused when they
>>> Duncan> accidentally answer Yes to the prompt to save it.
>>>
>>> Ok... but I probably misunderstand a bit:
>>>
>>> The default has not been q(save = "ask") but q(save = "default"),
>>> and that default has depended on startup.
>>>
>>> Even now, "R --no-save" already did have the desired effect,
>>> on Unix at least. For my ESS setup, I have made this an automatic
>>> default many months ago.
>>>
>>> Wouldn't it be easier and sufficient to make "--no-save" a
>>> working option on all platforms ?
>>> Or is the point really about changing the quitting dialog?
>>> For me quitting *without* a dialog is the most important thing
>>> which I use (often several times a day).
>>>
>>> Duncan> I'm not sure about the wording of the user prompt
>>> Duncan> question, which is now "Quit and discard
>>> Duncan> workspace?". The problem with this wording is that
>>> Duncan> someone who automatically hits "y" will lose their
>>> Duncan> work. I've tried on Windows to make the dialog box
>>> Duncan> look different enough that they should be warned.
>>>
>>> good!
>>>
>>> Duncan> I haven't made any change to the Mac GUI to support this. On
>>> Duncan> Unix-alikes, the text prompt should respect this option.
>>>
>>> Duncan> The other change is to the Windows installer, to
>>> Duncan> allow the user to choose whether to set
>>> Duncan> quit.with.no.save, MDI/SDI display, and help style
>>> Duncan> at install time. The only (intentional) change to
>>> Duncan> the current behaviour is to default to CHM help
>>> Duncan> instead of plain text.
>>>
>>> People have asked me in private about this, and I didn't know
>>> the answer:
>>> Is it true that this means that people can no longer commit the
>>> "cheap package install trick" on Windows for R-code-only
>>> packages?
>>> Namely
>>> 1) install a source package on a Linux/Unix/MacOSX machine
>>> (where it is often simple to have all the necessary tools available)
>>> 2) zip the resulting installed package
>>> 3) unzip it on the target Windows machine into the corresponding
>>> library (directory).
>>>
>>> Of course, this trick will not provide any *.chm help files.
>>> Will the cheap-installed package still work, using the *.txt (or
>>> *.html) help files?
>>
>>
>>
>> Well, the user has to ask
>>     help(topic, chmhelp = FALSE)
>> in this case, or (s)he get the message:
>>
>>               No CHM help for 'foo' in package 'pkg' is available:
>>       the CHM file for the package is missing
>>
>> Perhaps it is possible to arrange some fallback to plain text help if
>> chmhelp is not available: in print.help_files_with_topic call print() on
>> the "help_files_with_topic" object again, but change attribute "type" to
>> "help" before that call ...
>
> Yes, that seems to work.  I'll add that.

Before help() was reorganized to use print() methods it used to fall back to text help if other versions were not available (at least on Windows), so it does seem sensible to reinstate that.

Brian

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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