Injecting a command into stdin / input

Injecting a command into stdin / input

[Zach Riggle]

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Hello All!

I've been doing some rather ridiculous things with zsh-defer [1] in order
to speed up my shell startup time.  I've knocked it down by about 80%!

The down-side is that the terminal exits if the first input is <enter>, but
works fine if any command is executed.

How can I inject a command for the first line, e.g. "/usr/bin/clear" in
order to jerry-rig this to work?

*Zach Riggle*

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Re: Injecting a command into stdin / input

[Lawrence Velázquez]

On Wed, Sep 7, 2022, at 9:26 PM, Zach Riggle wrote:
> I've been doing some rather ridiculous things with zsh-defer [1]

Looks like you forgot the link.

https://github.com/romkatv/zsh-defer

> in order to speed up my shell startup time.  I've knocked it down by
> about 80%!
>
> The down-side is that the terminal exits if the first input is <enter>, 
> but works fine if any command is executed.
>
> How can I inject a command for the first line, e.g. "/usr/bin/clear" in 
> order to jerry-rig this to work?

Perhaps Roman can provide some advice, as he is the author of
zsh-defer.  (I know he's subscribed to this list, but I've Cc-ed
him for expediency.)

-- 
vq

Re: Injecting a command into stdin / input

[Roman Perepelitsa]

On Thu, Sep 8, 2022 at 3:27 AM Zach Riggle <zachriggle@gmail.com> wrote:
>
> Hello All!
>
> I've been doing some rather ridiculous things with zsh-defer [1] in order to speed up my shell startup time.  I've knocked it down by about 80%!

You might want to read https://github.com/romkatv/zsh-bench if you
haven't already. Don't miss
https://github.com/romkatv/zsh-bench#deferred-initialization in
particular. The tl;dr is that deferred initialization is almost always
a bad idea. I'm being cautious with "almost" here. I don't actually
know of any use cases where deferred initialization is the right
solution.

> The down-side is that the terminal exits if the first input is <enter>, but works fine if any command is executed.

Never seen this. Can you post the smallest zshrc that reproduces this problem?

> How can I inject a command for the first line, e.g. "/usr/bin/clear" in order to jerry-rig this to work?

It's too early to attempt workarounds. There might be a way to fix the
underlying problem.

Roman.