From r@oknz @end|ng |rom gm@||@com  Thu Jun  6 23:04:06 2019
From: r@oknz @end|ng |rom gm@||@com (Richard O'Keefe)
Date: Fri, 7 Jun 2019 09:04:06 +1200
Subject: [Rd] [R] Open a file which name contains a tilde
In-Reply-To: <20190606135957.0be4db10@trisector>
References: <20190605160714.GA24635@debian64>
 <20190606135957.0be4db10@trisector>
Message-ID: <CABcYAdLgLrBwNW4A4EgYx0RwD9zjCo4Mpe7S05SeohoNmMQSGg@mail.gmail.com>

How can expanding tildes anywhere but the beginning of a file name NOT be
considered a bug?


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
>
> ______________________________________________
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[Rd] [R] Open a file which name contains a tilde
Richard O'Keefe