Hari Kirshna Dara wrote:
> > > I am trying to use feedkeys() to give input to a Vim command that is
> > > expecting input from the user, and it works if the command is not
> > > executed using :silent prefix. Here is an example (executed on JDK 1.4.2
> > > source):
> > >
> > > :ta Integer
> > > tag 1 of 11 or more
> > > :call feedkeys("4\<CR>") | ts
> > > <takes me to the 4th tag>
> > >
> > > If I prefix the :ts command with :silent, this doesn't work, and the fed
> > > keys are handled by Vim as normal mode commands.
> > >
> > > :call feedkeys("4\<CR>") | silent ts
> >
> > If you try ":silent ts" manually you will see that this doesn't work
> > either. This has nothing to do with feedkeys(). If you silence an
> > interactive command you can predict it won't work. This is mostly to
> > prevent Vim from an apparent hang when someone uses ":silent" for an
> > interactive command (often indirectly).
>
> I understand that silencing an interactive command should work this way,
> but when there are keys to be consumed, especially fed in advance using
> feedkeys(), what is wrong in feeding to the interactive command? To me,
> the usefulness of feedkeys() goes down significantly if this is not
> supported. In fact, I don't know where you would need feedkeys() as
> using a dynamic mapping can already achieve this.
I don't know what you are talking about. The "4\<CR>" in your example
is executed, the cursor moves four lines down.
Making interactive commands with ":silent" sometimes accept keys and
sometimes not makes them unpredictable. Consider the hit-enter prompt,
for example.
> All interactive commands in unix work with redirected stdio (well,
> except those that directly open the console, which are very rare), and
> why shouldn't this be the case with vim commands? We have output
> redirection for interactive commands, why can't they have a way to take
> input by other means?
You are over-generalizing. Does firefox redirect stdio? Does "reboot"?
This only applies to commands that were made to be used in a pipe.
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