nushell/crates/nu-command/src/system
Steven Xu 1d3f6105f5
feat: add a command_not_found hook (#8314)
# Description
Add a `command_not_found` function to `$env.config.hooks`. If this
function outputs a string, then it's included in the `help`.

An example hook on *Arch Linux*, to find packages that contain the
binary, looks like:

```nushell
let-env config = {
  # ...
  hooks: {
    command_not_found: {
      |cmd_name| (
        try {
          let pkgs = (pkgfile --binaries --verbose $cmd_name)
          (
            $"(ansi $env.config.color_config.shape_external)($cmd_name)(ansi reset) " +
            $"may be found in the following packages:\n($pkgs)"
          )
        } catch {
          null
        }
      )
    }
    # ...
```

# User-Facing Changes
- Add a `command_not_found` function to `$env.config.hooks`.

# 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` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# 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.
2023-03-20 17:05:22 +13:00
..
complete.rs Document and critically review ShellError variants - Ep. 3 (#8340) 2023-03-06 18:33:09 +01:00
exec.rs Use imported names in Command::run signatures (#7967) 2023-02-05 22:17:46 +01:00
mod.rs relocate debug commands (#8071) 2023-02-13 16:39:07 +00:00
nu_check.rs Revert "Allow NU_LIBS_DIR and friends to be const" (#8501) 2023-03-17 09:33:24 -05:00
ps.rs Use imported names in Command::run signatures (#7967) 2023-02-05 22:17:46 +01:00
registry_query.rs Use imported names in Command::run signatures (#7967) 2023-02-05 22:17:46 +01:00
run_external.rs feat: add a command_not_found hook (#8314) 2023-03-20 17:05:22 +13:00
sys.rs Fix CPU usage info in sys (#8321) 2023-03-04 14:48:34 -08:00
which_.rs Document and critically review ShellError variants - Ep. 2 (#8326) 2023-03-06 11:31:07 +01:00