Nushell support

[dougg0k]

Verification

• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

Provide a detailed description of the proposed feature

Add support for Nushell in the installation and completions.

What is the motivation for the feature?

Currently it does not work and the steps required are for bash/sh.

Here are installation examples of why this is necessary.

nu ❯ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
/bin/bash: line 1: #!/bin/bash: No such file or directory

nu ✗ bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
bash: line 1: #!/bin/bash: No such file or directory

However if I download the sh and execute with bash, the installation goes through.

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But then, the last part of the installation are for sh based setup.

- Run these two commands in your terminal to add Homebrew to your PATH:
    (echo; echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"') >> /home/user/.bashrc
    eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"

Nushell does not have eval or at least if it does, does not work the same as bash.

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Lastly, have completions support with it.

How will the feature be relevant to at least 90% of Homebrew users?

It will be based on the relevancy of the amount of nushell users. It will add more users to Homebrew, not help the current ones.

What alternatives to the feature have been considered?

None

[Bo98]

Second part of your issue makes sense as a feature request - though we'd probably ask for a pull request to add it.

For the first part however, it seems like either nushell is mangling the curl output or you have an extremely buggy /bin/bash executable. In either case, you're not even getting to the bash-specific part: your shell is failing on basic POSIX shell syntax in that it can't even parse a shebang properly. This likely points to a bug outside of Homebrew.

[dougg0k]

That actually could be due to the expression $() not working with nushell, it's another thing that does not work like the other shells.

[dougg0k]

nushell/nushell#2812

https://www.nushell.sh/book/coming_from_bash.html

Workaround example for eval and $() https://www.nushell.sh/cookbook/ssh_agent.html#workarounds

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It could require a reimplementation most likely. A file or at least steps specifically for nushell.

There should be a way to build a command just for nushell to download and install in one go. But the steps after would need to be different.

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https://www.nushell.sh/book/how_nushell_code_gets_run.html

[Bo98]

We give instructions that work on all POSIX-compliant shells. The homepage would get very full if we started listing every non-compliant shell. Note how we don't have install instructions for PowerShell etc.

The shellenv instructions is a little different given we can detect the running shell and show the relevant message. We do support some non-POSIX shells there (since even POSIX shells can differ for this part) such as PowerShell so would be ok improving that part.

[dougg0k]

This would work on Nushell

curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh | bash

or

/bin/bash -c (curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)

[MikeMcQuaid]

We're not going to change this for Nushell, sorry.