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prevent same entry in $env.PATH #1104

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merged 4 commits into from
Oct 8, 2023
Merged

prevent same entry in $env.PATH #1104

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93026fd
prevent same entry in $env.PATH
joergsch Oct 8, 2023
25b7b9b
no need for env variable
joergsch Oct 8, 2023
6259575
simplification: make use of if .. in
joergsch Oct 8, 2023
7dc8109
remove mentions to `$env.my_path`
amtoine Oct 8, 2023
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8 changes: 8 additions & 0 deletions book/configuration.md
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Expand Up @@ -144,6 +144,14 @@ This will append `/some/path` to the end of PATH; you can also use [`prepend`](/

Note the `split row (char esep)` step. We need to add it because in `env.nu`, the environment variables inherited from the host process are still strings. The conversion step of environment variables to Nushell values happens after reading the config files (see also the [Environment](environment.html#environment-variable-conversions) section). After that, for example in the Nushell REPL when `PATH`/`Path` is a list , you can use [`append`](/commands/docs/append.md)/[`prepend`](/commands/docs/prepend.md) directly.

To prepend a new path only if not already listed, one can add to `env.nu`:
```nu
# create a new string holding the desired path
let my_path = ( $nu.home-path | path join "bin" )
# return $env.PATH if $my_path is already listed, return $env.PATH with $my_path prepended otherwise
$env.PATH = ( if $my_path in $env.PATH { $env.PATH } else { $env.PATH | prepend $my_path } )
```

### Homebrew

[Homebrew](https://brew.sh/) is a popular package manager that often requires PATH configuration. To add it to your Nushell PATH:
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