R-beta: auto save
maechler at stat.math.ethz.ch
Fri May 30 09:00:58 CEST 1997
>>>>> "Rob" == Robert Gentleman <rgentlem at stat.auckland.ac.nz> writes:
Rob> I'm just about to put an autosave feature into R as per requests...
Rob> My current thinking is that it should be an option
Rob> so that it is setable (in the profile if you want).
sounds very good.
Rob> One simply specifies the number of commands that are executed
Rob> between calls to save.
Let's call this number ASI ( = Auto_Save_Interval)
The question is how the default value for ASI is to be determined.
I think that ASI = Inf for 'BATCH' mode and when using source(.),
but ASI < Inf even if the user does not have a ~/.Rprofile.
Rob> It won't be incremental; I'll just dump the output
Rob> of ls(). I think that the file name should not be .RData but
Rob> rather something like .RAutoSave (so it's there if you need it but
Rob> you don't get it on startup unless you ask for it).
The following is a different proposal,
maybe more intuitive for "novices" :
A regular q(ask) probably should remove .RAutoSave:
[ if ask='yes', we have a new .RData anyway,
and otherwise, we wanted to rm(.) things ]
Then, upon startup, when there's an .RAutoSave newer than .RData,
it must have been from a "crash" (non-regular termination of R),
and the user would be asked if (s)he wanted to use .RAutoSave instead of
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