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# Description For years, Nushell has used `let-env` to set a single environment variable. As our work on scoping continued, we refined what it meant for a variable to be in scope using `let` but never updated how `let-env` would work. Instead, `let-env` confusingly created mutations to the command's copy of `$env`. So, to help fix the mental model and point people to the right way of thinking about what changing the environment means, this PR removes `let-env` to encourage people to think of it as updating the command's environment variable via mutation. Before: ``` let-env FOO = "BAR" ``` Now: ``` $env.FOO = "BAR" ``` It's also a good reminder that the environment owned by the command is in the `$env` variable rather than global like it is in other shells. # User-Facing Changes BREAKING CHANGE BREAKING CHANGE This completely removes `let-env FOO = "BAR"` so that we can focus on `$env.FOO = "BAR"`. # Tests + Formatting <!-- Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect -A clippy::result_large_err` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass - `cargo run -- crates/nu-std/tests/run.nu` to run the tests for the standard library > **Note** > from `nushell` you can also use the `toolkit` as follows > ```bash > use toolkit.nu # or use an `env_change` hook to activate it automatically > toolkit check pr > ``` --> # After / Before Submitting integration scripts to update: - ✔️ [starship](https://github.com/starship/starship/blob/master/src/init/starship.nu) - ✔️ [virtualenv](https://github.com/pypa/virtualenv/blob/main/src/virtualenv/activation/nushell/activate.nu) - ✔️ [atuin](https://github.com/ellie/atuin/blob/main/atuin/src/shell/atuin.nu) (PR: https://github.com/ellie/atuin/pull/1080) - ❌ [zoxide](https://github.com/ajeetdsouza/zoxide/blob/main/templates/nushell.txt) (PR: https://github.com/ajeetdsouza/zoxide/pull/587) - ✔️ [oh-my-posh](https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/src/shell/scripts/omp.nu) (pr: https://github.com/JanDeDobbeleer/oh-my-posh/pull/4011)
39 lines
1013 B
Plaintext
39 lines
1013 B
Plaintext
use std
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def test_path_add [] {
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use std assert
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let path_name = if "PATH" in $env { "PATH" } else { "Path" }
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with-env [$path_name []] {
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def get_path [] { $env | get $path_name }
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assert equal (get_path) []
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std path add "/foo/"
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assert equal (get_path) ["/foo/"]
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std path add "/bar/" "/baz/"
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assert equal (get_path) ["/bar/", "/baz/", "/foo/"]
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load-env {$path_name: []}
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std path add "foo"
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std path add "bar" "baz" --append
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assert equal (get_path) ["foo", "bar", "baz"]
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assert equal (std path add "fooooo" --ret) ["fooooo", "foo", "bar", "baz"]
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assert equal (get_path) ["fooooo", "foo", "bar", "baz"]
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load-env {$path_name: []}
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let target_paths = {linux: "foo", windows: "bar", macos: "baz"}
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std path add $target_paths
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assert equal (get_path) [($target_paths | get $nu.os-info.name)]
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}
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}
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def test_banner [] {
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std assert ((std banner | lines | length) == 15)
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}
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