On Sunday, January 8, 2017 at 5:43:58 PM UTC-5, ZyX wrote:
> 2017-01-09 0:18 GMT+03:00 Gary Johnson
> > On 2017-01-08, justrajdeep wrote:
> >> On Saturday, January 7, 2017 at 1:20:14 PM UTC-5, Gary Johnson wrote:
> >> > On 2017-01-07, Justin M. Keyes wrote:
> >> >
> >> > > On Jan 6, 2017 17:09, "justrajdeep" wrote:
> >> >
> >> > >> Having an issue while doing a system() call with fzy(https://github.com/
> >> > >> Dkendal/fzy-vim)from inside gvim
> >> > >>
> >> > >> Code snippet
> >> > >>
> >> > >> silent let output = system("ag -l -g '' --nocolor | fzy")
> >> > >>
> >> > >> Decho(1)
> >> > >> Decho (output)
> >> > >> Decho(2)
> >> > >> Decho(3)
> >> > >>
> >> > >>
> >> > >> The output is
> >> > >>
> >> > >> 1
> >> > >> Failed to open /dev/tty^J
> >> > >> 2
> >> > >> 3
> >> > >>
> >> > >>
> >> > >> If i remove fzy from the command the result is fine. Can someone please
> >> > >> help me debugging the issue?
> >> >
> >> > > Most likely, fzy wants to write to a tty, not a file.
> >> >
> >> > Looking at the web page https://github.com/jhawthorn/fzy, it's
> >> > pretty clear that fzy writes directly to a terminal, separately from
> >> > its stdout, which vim running in a termina provides, but which gvim
> >> > doesn't.
> >> >
> >> > Regards,
> >> > Gary
> >>
> >>
> >> Thanks Gary,
> >>
> >> Can you please point me to the details of this in vim help or
> >> somewhere? Sorry I am new to vim programming and would like to
> >> understand the difference and try to see if I can somehow get it
> >> working.
> >
> > Hi Rajdeep,
> >
> > I couldn't find a very detailed explanation in the Vim help. There
> > is a little bit here.
> >
> > :help gui-pty
> >
> > I originally thought the problem was just that the terminal
> > emulation provided by gvim lacked some of the capabilities needed by
> > fzy, but that's not what fzy is complaining about when it says it
> > "Failed to open /dev/tty".
> >
> > fzy assumes that it is running in a terminal and that this terminal
> > can be accessed by the device name /dev/tty. That is true when fzy
> > is run from the shell executed by a terminal emulator or by vim's or
> > gvim's :sh command, and it is true when fzy is run from the shell
> > executed by vim's system() function, but it is not true when fzy is
> > run from the shell executed by gvim's system() function.
> >
> > You can see that by running "tty < /dev/tty" in those environments.
> > In all cases but one the command prints "/dev/tty". When run in
> > a system() function from within gvim, the results are different:
> >
> > :echo system("tty < /dev/tty")
> > /bin/bash: /dev/tty: No such device or address
> >
> > But you _can_ send output from a system() command to the pty that
> > gvim creates for shell commands.
> >
> > :!tty
> > /dev/pts/16
> > :call system("ls > /dev/pts/16")
> >
> > So, if one could coerce gvim or the shell into creating a /dev/tty
> > for programs run from system() in a GUI environment, as is done now
> > for :! and :sh, then your fzy command should work.
> >
> > I don't know why gvim's system() doesn't do that already.
>
> This is too much work: basically you need to reimplement terminal
> emulator and somehow integrate it with the rest of the UI. You should
> rather ask why Vim does not follow Neovim way which intentionally
> disallows access to /dev/tty from system() or :! so a set of dirty,
> unportable hacks do not work (hacks require both terminal Vim and
> *nix).
>
> Note that GVim does not provide fully featured terminal emulator. Do
> not try to write just `ls` output there, try using something which
> emits control sequences which change color or move cursor: both are
> required for fzy to work and "terminal emulator" attached to the
> pseudo-terminal created by GVim will fail interpreting them correctly.
>
> >
> > Regards,
> > Gary
> >
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Thanks for the detail explanation. Wish I were a software developer and could contribute in my small way to this awesome editor.
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