[R-pkg-devel] Wrong mailing list: Could the 100 byte path length limit be lifted?

Compiled code is another source of long names.  Some libraries are produced
by companies with style restrictions that demand LongDescriptiveNames for
functions and classes, and which expect file names to match the name of the
class contained within.  If you've got
Models/SpecificModelFamily/PosteriorSamplers/SpecificTypeOfPosteriorSampler.hpp
it leaves very little room (20 characters) for "C:\Users\..." etc up
front.

I solved my 'tar' problems with 'sed'.  In human readable code I keep the
long names.  In the code that gets submitted to CRAN I pass specific file
names through sed to rename the long files.  I have an install script with
lines like:

hdr="MvStateSpaceRegressionPosteriorSampler.hpp"
new_hdr="MVSSRPS.hpp"
mv "$ibase/$dbase/$hdr" "$ibase/$dbase/$new_hdr"
echo "replacing $dbase/$hdr with $dbase/$new_hdr"
grep -rl "$dbase/$hdr" "$BOOM_DIR/src/Models" | xargs $SED -i
"s|$dbase/$hdr|$dbase/$new_hdr|g"

This renames the files, and uses sed to replace #include references to file
names with the shorter file names.  The SED macro is because on mac 'sed'
is spelled 'gsed'.

I agree the system sucks.  It would be nice if one of the steps in
winbuilder took non-windows compliant TAR files and replaced them with ZIP
files or something similar.  We'd still have the Win32 character limit, but
256 > 100 so the problem wouldn't bite so hard.

On Thu, Dec 14, 2023 at 6:19?AM Vladimir Dergachev <volodya at mindspring.com>
wrote:

On Wed, 13 Dec 2023, McGrath, Justin M wrote:

On Windows, packages will be in "C:\Users\[User

Name]\Documents\R\win-library\[R version]\[Package Name]".

With a 150 byte limit, that leaves 70 bytes for the user name, R version
and package name. That seems more than sufficient. If people are
downloading the source files, that also leaves plenty of space
regardless where they choose to extract the files.

70 bytes ?? My name is 18 characters long and there are plenty of people
with longer names. I also saw practice on Windows systems to append the
name of organization or department.

Also, this restricts the length of package name which is arguably more
important that internal package path names that the user never sees.

That said, that Windows limitation is only for some programs, and the
pertitent question is whether R and any software used by R has this
limitation. I suspect the answer is no, but as all my systems are Linux
I can not check.

Vladimir Dergachev

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