Re: Passing " &> " shell-command string to shell

On 2013-10-28, AlmostSurely wrote:
> On Monday, October 28, 2013 3:15:33 PM UTC-4, Gary Johnson wrote:
> > On 2013-10-28, AlmostSurely wrote:
> > > On Monday, October 28, 2013 2:06:11 PM UTC-4, AlmostSurely wrote:
> > > > Consider the following function,
> > > >
> > > > function! Compile()
> > > > :cmd_string = "g++ -std=c++11 " . expand("%") . " &> " . expand("%:r") . ".log"
> > > > :execute "silent !" . cmd_string
> > > > endfunction
> > > >
> > > > The simple goal is to compile with g++, writing any compiler output to a log file.
> > > > I'm having trouble passing the " &> " term to the shell.
> > > > Suppose % expands to file.cpp, then adding the line,
> > > >
> > > > :execute "!echo " . cmd_string
> > > >
> > > > Produces:
> > > >
> > > > g++ -std=c++11 file.cpp
> > > >
> > > > So the " &> " doesn't even make it to the shell. Any help is much appreciated.
> >
> > :execute "!echo " . cmd_string
> >
> > evaluates to
> >
> > :!echo g++ -std=c++11 file.cpp &> file.log
> >
> > which echoes "g++ -std=c++11 file.cpp" to file.log.
> >
> > I verified that result using Vim 7.4.52 started as "vim -N -u NONE
> > file.cpp" on a system running Fedora 11.
> >
> > So it works as expected for me.
> >
> > Regards,
> > Gary
>
> Hi Gary, this is with Vim 7.4 with spf13, xterm-256color, on Ubuntu 13.10.
>
> I've been playing around with it and changing the function to:
> ==========================================
> function! Compile()
> :let cmd_string = "g++ -std=c++11 " . expand("%") . ' \&\> ' . expand("%:r") . ".log"
> :execute "!echo " . cmd_string
> :execute "!" . cmd_string
> endfunction
> ==========================================
>
> Produces output:
> ==========================================
> g++ -std=c++11 file.cpp &> file.log
>
> Press ENTER or type command to continue
> g++: error: &>: No such file or directory
> g++: error: file.log: No such file or directory
>
> shell returned 1
>
> Press ENTER or type command to continue
> ==========================================
>
> But using the function in the OP does not produce the &> file.log on my machine even... Any ideas?

Quoting the &> as you did (\&\>) removes the special meaning of
those characters to the shell, so the shell passes them to g++ which
sees them as a file name. Also, without the &> redirection, the
shell also sees file.log as an argument to be passed to g++ and g++
can't find that file, either.

If I remove that quoting from &> so that the :let command in that
function becomes

:let cmd_string = "g++ -std=c++11 " . expand("%") . ' &> ' . expand("%:r") . ".log"

then create an empty file.cpp, open it in vim, source the Compile()
function and execute

:call Compile()

I get an output of

:!echo g++ -std=c++11 file.cpp &> file.log
:!g++ -std=c++11 file.cpp &> file.log

shell returned 1

Press ENTER or type command to continue

and file.log contains

cc1plus: error: unrecognized command line option "-std=c++11"

(I must have an old version of gcc.) If I use the function from the
OP, with the added let, I get the same error message in file.log.

Nothing is coming to mind as a reason for it behaving differently
for you. You mentioned that you use spf13. Have you tried your
function alone, without your ~/.vimrc or any plugins, that is,
started as

vim -N -u NONE

?

Regards,
Gary

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