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<!-- if this PR closes one or more issues, you can automatically link the PR with them by using one of the [*linking keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword), e.g. - this PR should close #xxxx - fixes #xxxx you can also mention related issues, PRs or discussions! --> # Description <!-- Thank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes. Description of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience. --> The [nushell/demo](https://github.com/nushell/demo) project successfully demonstrated running Nushell in the browser using WASM. However, the current version of Nushell cannot be easily built for the `wasm32-unknown-unknown` target, the default for `wasm-bindgen`. This PR introduces initial support for the `wasm32-unknown-unknown` target by disabling OS-dependent features such as filesystem access, IO, and platform/system-specific functionality. This separation is achieved using a new `os` feature in the following crates: - `nu-cmd-lang` - `nu-command` - `nu-engine` - `nu-protocol` The `os` feature includes all functionality that interacts with an operating system. It is enabled by default, but can be disabled using `--no-default-features`. All crates that depend on these core crates now use `--no-default-features` to allow compilation for WASM. To demonstrate compatibility, the following script builds all crates expected to work with WASM. Direct user interaction, running external commands, working with plugins, and features requiring `openssl` are out of scope for now due to their complexity or reliance on C libraries, which are difficult to compile and link in a WASM environment. ```nushell [ # compatible crates "nu-cmd-base", "nu-cmd-extra", "nu-cmd-lang", "nu-color-config", "nu-command", "nu-derive-value", "nu-engine", "nu-glob", "nu-json", "nu-parser", "nu-path", "nu-pretty-hex", "nu-protocol", "nu-std", "nu-system", "nu-table", "nu-term-grid", "nu-utils", "nuon" ] | each {cargo build -p $in --target wasm32-unknown-unknown --no-default-features} ``` ## Caveats This PR has a few caveats: 1. **`miette` and `terminal-size` Dependency Issue** `miette` depends on `terminal-size`, which uses `rustix` when the target is not Windows. However, `rustix` requires `std::os::unix`, which is unavailable in WASM. To address this, I opened a [PR](https://github.com/eminence/terminal-size/pull/68) for `terminal-size` to conditionally compile `rustix` only when the target is Unix. For now, the `Cargo.toml` includes patches to: - Use my forked version of `terminal-size`. - ~~Use an unreleased version of `miette` that depends on `terminal-size@0.4`.~~ These patches are temporary and can be removed once the upstream changes are merged and released. 2. **Test Output Adjustments** Due to the slight bump in the `miette` version, one test required adjustments to accommodate minor formatting changes in the error output, such as shifted newlines. # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> This shouldn't break anything but allows using some crates for targeting `wasm32-unknown-unknown` to revive the demo page eventually. # 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` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass (on Windows make sure to [enable developer mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging)) - `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` 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 > ``` --> - 🟢 `toolkit fmt` - 🟢 `toolkit clippy` - 🟢 `toolkit test` - 🟢 `toolkit test stdlib` I did not add any extra tests, I just checked that compiling works, also when using the host target but unselecting the `os` feature. # After Submitting <!-- If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. --> ~~Breaking the wasm support can be easily done by adding some `use`s or by adding a new dependency, we should definitely add some CI that also at least builds against wasm to make sure that building for it keep working.~~ I added a job to build wasm. --------- Co-authored-by: Ian Manske <ian.manske@pm.me> |
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nu-cmd-lang
the base language and command crate of nu
The commands in this crate are the core commands of the nu language. It is also the base crate upon which all other command crates sit on top of including:
- nu-command
- nu-cli
- nu-cmd-extra
As time goes on and the nu language develops further in parallel with nushell we will be adding other command crates to the system.
What does it mean to be a base crate ?
A base crate is one with minimal dependencies in our system so that other developers can come along and use this crate without having a lot of baggage in terms of other crates which will bloat their underlying application.
Background on nu-cmd-lang
This crate was designed to be a small, concise set of tools or commands that serve as the foundation layer of both nu and nushell. These are the core commands needed to have a nice working version of the nu language without all of the support that the other commands provide inside nushell. Prior to the launch of this crate all of our commands were housed in the crate nu-command. Moving forward we would like to slowly break out the commands in nu-command into different crates; the naming and how this will work and where all the commands will be located is a "work in progress" especially now that the standard library is starting to become more popular as a location for commands. As time goes on some of our commands written in rust will be migrated to nu and when this happens they will be moved into the standard library.