> On Jun 6, 2019, at 2:04 PM, Richard O'Keefe <raoknz at gmail.com> wrote: > > How can expanding tildes anywhere but the beginning of a file name NOT be > considered a bug? > >I think that that IS what libreadline is doing if one allows a whitespace separated list of file names. As reported in R-help, https://www.mail-archive.com/r-help at r-project.org/msg254116.html path.expand seems to expand tildes beginning whitespace separated strings that could be filenames, but not other tildes. Thus,> path.expand("~/.newsrc ~/.R/*") # expands both tildes[1] "/Users/cberry/.newsrc /Users/cberry/.R/*"> path.expand("~/.newsrc~/.R/*") # expands only the first[1] "/Users/cberry/.newsrc~/.R/*">This could be a feature if what one wanted was to pass the result to a system command that will process multiple file arguments, e.g.> system(paste( "wc", path.expand("~/.newsrc ~/.R/*"))) # run wc on some filesI doubt that this was intended by R-core, but perhaps the readline devs had this in mind. Chuck> On Thu, 6 Jun 2019 at 23:04, Ivan Krylov <krylov.r00t at gmail.com> wrote: > >> On Wed, 5 Jun 2019 18:07:15 +0200 >> Frank Schwidom <schwidom at gmx.net> wrote: >> >>> +> path.expand("a ~ b") >>> [1] "a /home/user b" >> >>> How can I switch off any file crippling activity? >> >> It doesn't seem to be possible if readline is enabled and works >> correctly. >> >> Calls to path.expand [1] end up [2] in R_ExpandFileName [3], which >> calls R_ExpandFileName_readline [4], which uses libreadline function >> tilde_expand [5]. tilde_expand seems to be designed to expand '~' >> anywhere in the string it is handed, i.e. operate on whole command >> lines, not file paths. >> >> I am taking the liberty of Cc-ing R-devel in case this can be >> considered a bug. >> >> -- >> Best regards, >> Ivan >> >> [1] >> >> https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/names.c#L807 >> >> [2] >> >> https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/platform.c#L1915 >> >> [3] >> >> https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-unix.c#L147 >> >> [4] >> >> https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-std.c#L494 >> >> [5] >> https://git.savannah.gnu.org/cgit/readline.git/tree/tilde.c?h=devel#n187 >> >> ______________________________________________ >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > [[alternative HTML version deleted]] >
?path.expand
Expand a path name, for example by replacing a leading tilde by
the user's home directory (if defined on that platform).
*A* path name. The argument is a character vector.
If multiple path names are passed, they are passed
On most builds of R *A LEADING* "~user" will be replaced...
Nothing is said in the R documentation about *multiple* or
*non-leading* tildes being replaced.
The actual behaviour is inconsistent with the documentation.
SOMETHING is a bug.
It's not clear to me why this is in any way dependent on
readline. I've implemented tilde expansion several times
and always without readline.
It sounds as though R might be calling tilde_expand()
when it *should*, to be consistent with the documentation,
be calling tilde_expand_word().
as separate elements of the character vector.
On Sat, 8 Jun 2019 at 04:10, Berry, Charles <ccberry at ucsd.edu> wrote:
>
>
> > On Jun 6, 2019, at 2:04 PM, Richard O'Keefe <raoknz at
gmail.com> wrote:
> >
> > How can expanding tildes anywhere but the beginning of a file name NOT
be
> > considered a bug?
> >
> >
>
> I think that that IS what libreadline is doing if one allows a whitespace
> separated list of file names.
>
> As reported in R-help,
>
> https://www.mail-archive.com/r-help at r-project.org/msg254116.html
>
> path.expand seems to expand tildes beginning whitespace separated strings
> that could be filenames, but not other tildes.
>
> Thus,
>
> > path.expand("~/.newsrc ~/.R/*") # expands both tildes
> [1] "/Users/cberry/.newsrc /Users/cberry/.R/*"
> > path.expand("~/.newsrc~/.R/*") # expands only the first
> [1] "/Users/cberry/.newsrc~/.R/*"
> >
>
> This could be a feature if what one wanted was to pass the result to a
> system command that will process multiple file arguments, e.g.
>
> > system(paste( "wc", path.expand("~/.newsrc
~/.R/*"))) # run wc on some
> files
>
> I doubt that this was intended by R-core, but perhaps the readline devs
> had this in mind.
>
> Chuck
>
>
> > On Thu, 6 Jun 2019 at 23:04, Ivan Krylov <krylov.r00t at
gmail.com> wrote:
> >
> >> On Wed, 5 Jun 2019 18:07:15 +0200
> >> Frank Schwidom <schwidom at gmx.net> wrote:
> >>
> >>> +> path.expand("a ~ b")
> >>> [1] "a /home/user b"
> >>
> >>> How can I switch off any file crippling activity?
> >>
> >> It doesn't seem to be possible if readline is enabled and
works
> >> correctly.
> >>
> >> Calls to path.expand [1] end up [2] in R_ExpandFileName [3], which
> >> calls R_ExpandFileName_readline [4], which uses libreadline
function
> >> tilde_expand [5]. tilde_expand seems to be designed to expand
'~'
> >> anywhere in the string it is handed, i.e. operate on whole command
> >> lines, not file paths.
> >>
> >> I am taking the liberty of Cc-ing R-devel in case this can be
> >> considered a bug.
> >>
> >> --
> >> Best regards,
> >> Ivan
> >>
> >> [1]
> >>
> >>
>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/names.c#L807
> >>
> >> [2]
> >>
> >>
>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/platform.c#L1915
> >>
> >> [3]
> >>
> >>
>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-unix.c#L147
> >>
> >> [4]
> >>
> >>
>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-std.c#L494
> >>
> >> [5]
> >>
> https://git.savannah.gnu.org/cgit/readline.git/tree/tilde.c?h=devel#n187
> >>
> >> ______________________________________________
> >> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more,
see
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> >> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> > [[alternative HTML version deleted]]
> >
>
>
>
[[alternative HTML version deleted]]
Hello,
R 3.6.0 on Ubuntu 19.04.
Since no one mentioned it, notice that the tilde in the middle of a
string needs to be surrounded by spaces to be expanded.
The first code line works as expected, only the second is wrong (buggy).
path.expand('a~b')
#[1] "a~b"
path.expand('a ~ b')
#[1] "a /home/rui b"
Rui Barradas
?s 04:27 de 08/06/19, Richard O'Keefe escreveu:> ?path.expand
> Expand a path name, for example by replacing a leading tilde by
> the user's home directory (if defined on that platform).
>
> *A* path name. The argument is a character vector.
> If multiple path names are passed, they are passed
>
> On most builds of R *A LEADING* "~user" will be replaced...
>
> Nothing is said in the R documentation about *multiple* or
> *non-leading* tildes being replaced.
>
> The actual behaviour is inconsistent with the documentation.
> SOMETHING is a bug.
>
> It's not clear to me why this is in any way dependent on
> readline. I've implemented tilde expansion several times
> and always without readline.
> It sounds as though R might be calling tilde_expand()
> when it *should*, to be consistent with the documentation,
> be calling tilde_expand_word().
>
>
>
> as separate elements of the character vector.
>
>
>
> On Sat, 8 Jun 2019 at 04:10, Berry, Charles <ccberry at ucsd.edu>
wrote:
>
>>
>>
>>> On Jun 6, 2019, at 2:04 PM, Richard O'Keefe <raoknz at
gmail.com> wrote:
>>>
>>> How can expanding tildes anywhere but the beginning of a file name
NOT be
>>> considered a bug?
>>>
>>>
>>
>> I think that that IS what libreadline is doing if one allows a
whitespace
>> separated list of file names.
>>
>> As reported in R-help,
>>
>> https://www.mail-archive.com/r-help at
r-project.org/msg254116.html
>>
>> path.expand seems to expand tildes beginning whitespace separated
strings
>> that could be filenames, but not other tildes.
>>
>> Thus,
>>
>>> path.expand("~/.newsrc ~/.R/*") # expands both tildes
>> [1] "/Users/cberry/.newsrc /Users/cberry/.R/*"
>>> path.expand("~/.newsrc~/.R/*") # expands only the first
>> [1] "/Users/cberry/.newsrc~/.R/*"
>>>
>>
>> This could be a feature if what one wanted was to pass the result to a
>> system command that will process multiple file arguments, e.g.
>>
>>> system(paste( "wc", path.expand("~/.newsrc
~/.R/*"))) # run wc on some
>> files
>>
>> I doubt that this was intended by R-core, but perhaps the readline devs
>> had this in mind.
>>
>> Chuck
>>
>>
>>> On Thu, 6 Jun 2019 at 23:04, Ivan Krylov <krylov.r00t at
gmail.com> wrote:
>>>
>>>> On Wed, 5 Jun 2019 18:07:15 +0200
>>>> Frank Schwidom <schwidom at gmx.net> wrote:
>>>>
>>>>> +> path.expand("a ~ b")
>>>>> [1] "a /home/user b"
>>>>
>>>>> How can I switch off any file crippling activity?
>>>>
>>>> It doesn't seem to be possible if readline is enabled and
works
>>>> correctly.
>>>>
>>>> Calls to path.expand [1] end up [2] in R_ExpandFileName [3],
which
>>>> calls R_ExpandFileName_readline [4], which uses libreadline
function
>>>> tilde_expand [5]. tilde_expand seems to be designed to expand
'~'
>>>> anywhere in the string it is handed, i.e. operate on whole
command
>>>> lines, not file paths.
>>>>
>>>> I am taking the liberty of Cc-ing R-devel in case this can be
>>>> considered a bug.
>>>>
>>>> --
>>>> Best regards,
>>>> Ivan
>>>>
>>>> [1]
>>>>
>>>>
>>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/names.c#L807
>>>>
>>>> [2]
>>>>
>>>>
>>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/main/platform.c#L1915
>>>>
>>>> [3]
>>>>
>>>>
>>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-unix.c#L147
>>>>
>>>> [4]
>>>>
>>>>
>>
https://github.com/wch/r-source/blob/12d1d2d232d84aa355e333348b81180a0e2c6f2f/src/unix/sys-std.c#L494
>>>>
>>>> [5]
>>>>
>>
https://git.savannah.gnu.org/cgit/readline.git/tree/tilde.c?h=devel#n187
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and
more, see
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide
>>>> http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible
code.
>>>>
>>>
>>> [[alternative HTML version deleted]]
>>>
>>
>>
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>