Thanks Duncan. The behaviour is tricky, and I'm still not sure I can predict
it. Indeed,
I spent about an hour fiddling with file.choose(). It allows navigation across
directories,
so is not totally without value. However, I've noticed users are very prone to
making errors
when they aren't in the "right" place, and my application is for non-technical
users. In fact,
it is a tool to help people pay bills and get documents online who are new to
computing,
or at least to online processing of payments and reports (Canada Post strike in
mind!)
and process them in a planned and orderly way so records are safely kept.
(Yes, I realize R is an odd choice, but is IS cross-platform, and the working
example uses
YAD in Linux for the dialogs.) I'll welcome discussion of this project offline.
Eventually
it should be on Github.
svDialogs seems promising, and I'm now exploring that, though I was
disappointed to find
a note (on page 17 of 19 in the pdf manual no less) that "some functions are
not working
yet in MacOS". Tests will be needed.
Cheers, John Nash
On 2024-12-18 13:39, Duncan Murdoch wrote:
I believe file.choose() remembers the last choice, and repeats that location the next time you call it. This is true
when it is called at top level or from within a function.
The first time you call it in a session, it will default to the current working
directory, but not after that.
Front ends are allowed to replace the underlying function, so that may depend on which front end you are using. I'm
talking about R.app on a Mac.
Duncan Murdoch
On 2024-12-18 10:32 a.m., J C Nash wrote:
I've been working on a small personal project that needs to select files for
manipulation from
various directories and move them around in planned ways. file.choose() is a
nice way to select
files. However, I've noticed that if file.choose() is called within a function,
it is the
directory from which that calling function has been invoked that is displayed
by file.choose().
This is not altered if I setwd() within that function. Have I misunderstood
something or is this
an infelicity of file.choose(). sessionInfo() gives my system as
R version 4.4.2 (2024-10-31)
Platform: x86_64-pc-linux-gnu
Running under: Linux Mint 22
I've a small example script. It actually helps to create nd1 and nd2 and give
them some dummy
files before testing.
Suggestions welcome.
John Nash
# fcdir.R -- show directory being used by function that calls file choose
cpath<-getwd()
nd1<-paste0(cpath,"/nd1")
nd2<-paste0(cpath,"/nd2")
dir.create(nd1)
dir.create(nd2)
myfc<-function(){
cat("myfc working in ",getwd(),"\n")
val<-file.choose()
val
}
myfcd<-function(adir){
setwd(adir)
cat("in myfcd, getwd() =", getwd(),"\n")
val<-file.choose()
val
}
print(getwd())
one<-myfc()
cat("one=",one,"\n")
setwd("nd1")
print(getwd())
two<-myfc() # This opens file.choose() in nd1
cat("two=",two,"\n")
setwd("..")
print(getwd())
three<-myfcd("nd2") # But this does not
cat("three=",three,"\n")
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