Getting the command in preexec as precisely typed

Getting the command in preexec as precisely typed

[Sylvia Gough]

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Hey,

The zsh manual says about `preexec` that: "the string that the user  typed
is passed  as  the  first argument". This mostly work as expected, but I
found cases where there is some expansion going on. In order to debug the
issue I'm seeing, I have this zsh code run from my zshrc:

```zsh
echo_preexec_command() {
  echo "$1" | cat -A
}
autoload -U add-zsh-hook
add-zsh-hook preexec echo_preexec_command
```

Now if I type `echo \b` the string `echo ^H$` is printed (i.e. `\b` was
replaced by `^H`).
This does not happen when using `fc -nl -1`.

How  can I get the same inside `preexec`?

Thanks!

Re: Getting the command in preexec as precisely typed

[Sebastian Gniazdowski]

On Sun, 2 Jun 2019 at 16:47, Sylvia Gough <q0h8xdveje@gmail.com> wrote:
> ...
> Now if I type `echo \b` the string `echo ^H$` is printed (i.e. `\b` was
> replaced by `^H`).
> This does not happen when using `fc -nl -1`.
>
> How  can I get the same inside `preexec`?
>
> Thanks!

It is the echo in the hook that does the conversion \b -> ^H. Use -E
option with echo to prevent this.

-- 
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org

Re: Getting the command in preexec as precisely typed

[Sylvia Gough]

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Thanks, that works!

On Sun, Jun 2, 2019 at 7:03 PM Sebastian Gniazdowski <sgniazdowski@gmail.com>
wrote:

> On Sun, 2 Jun 2019 at 16:47, Sylvia Gough <q0h8xdveje@gmail.com> wrote:
> > ...
> > Now if I type `echo \b` the string `echo ^H$` is printed (i.e. `\b` was
> > replaced by `^H`).
> > This does not happen when using `fc -nl -1`.
> >
> > How  can I get the same inside `preexec`?
> >
> > Thanks!
>
> It is the echo in the hook that does the conversion \b -> ^H. Use -E
> option with echo to prevent this.
>
> --
> Sebastian Gniazdowski
> News: https://twitter.com/ZdharmaI
> IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
> Blog: http://zdharma.org
>

Re: Getting the command in preexec as precisely typed

[Roman Perepelitsa]

When printing content outside of your control, use `print -r -- $1` or
`echo -E - $1`. Plain `echo -E $1` won't work if the argument is `-n`
or some other valid flag.

Roman.

Re: Getting the command in preexec as precisely typed

[Sylvia Gough]

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Good point, thanks!

On Mon, Jun 3, 2019 at 12:26 PM Roman Perepelitsa <
roman.perepelitsa@gmail.com> wrote:

> When printing content outside of your control, use `print -r -- $1` or
> `echo -E - $1`. Plain `echo -E $1` won't work if the argument is `-n`
> or some other valid flag.
>
> Roman.
>