Initial implementation for uutils uname (#11684)

Hi,
This PR aims at implementing the first iteration for `uname` using
`uutils`. Couple of things:
* Currently my [PR](https://github.com/uutils/coreutils/pull/5921) to
make the required changes is pending in `uutils` repo.
* I guess the number of flags has to be investigated. Still the tests
cover all of them.


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# Tests + Formatting
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- [X] `cargo fmt --all -- --check` to check standard code formatting
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- [X] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used`
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---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

crates/nu-command/Cargo.toml

@@ -91,6 +91,7 @@ uu_cp = { workspace = true }
 uu_mkdir = { workspace = true }
 uu_mktemp = { workspace = true }
 uu_mv = { workspace = true }
+uu_uname = { workspace = true }
 uu_whoami = { workspace = true }
 uuid = { workspace = true, features = ["v4"] }
 v_htmlescape = { workspace = true }

crates/nu-command/src/default_context.rs

@@ -122,6 +122,8 @@ pub fn add_shell_command_context(mut engine_state: EngineState) -> EngineState {
             Exec,
             NuCheck,
             Sys,
+            UName,
+
         };
 
         // Help

crates/nu-command/src/system/mod.rs

@@ -13,6 +13,7 @@ mod ps;
 mod registry_query;
 mod run_external;
 mod sys;
+mod uname;
 mod which_;
 
 pub use complete::Complete;
@@ -30,4 +31,5 @@ pub use ps::Ps;
 pub use registry_query::RegistryQuery;
 pub use run_external::{External, ExternalCommand};
 pub use sys::Sys;
+pub use uname::UName;
 pub use which_::Which;

crates/nu-command/src/system/uname.rs

@@ -0,0 +1,100 @@
+use nu_protocol::record;
+use nu_protocol::Value;
+use nu_protocol::{
+    ast::Call,
+    engine::{Command, EngineState, Stack},
+    Category, Example, PipelineData, ShellError, Signature, Type,
+};
+
+#[derive(Clone)]
+pub struct UName;
+
+impl Command for UName {
+    fn name(&self) -> &str {
+        "uname"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("uname")
+            .input_output_types(vec![(Type::Nothing, Type::Table(vec![]))])
+            .category(Category::System)
+    }
+
+    fn usage(&self) -> &str {
+        "Print certain system information."
+    }
+
+    fn search_terms(&self) -> Vec<&str> {
+        // add other terms?
+        vec!["system"]
+    }
+
+    fn run(
+        &self,
+        _engine_state: &EngineState,
+        _stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<PipelineData, ShellError> {
+        let span = call.head;
+        // Simulate `uname -all` is called every time
+        let opts = uu_uname::Options {
+            all: true,
+            kernel_name: false,
+            nodename: false,
+            kernel_release: false,
+            kernel_version: false,
+            machine: false,
+            processor: false,
+            hardware_platform: false,
+            os: false,
+        };
+        let output = uu_uname::UNameOutput::new(&opts).map_err(|e| ShellError::GenericError {
+            error: format!("{}", e),
+            msg: format!("{}", e),
+            span: None,
+            help: None,
+            inner: Vec::new(),
+        })?;
+        let outputs = [
+            output.kernel_name,
+            output.nodename,
+            output.kernel_release,
+            output.kernel_version,
+            output.machine,
+            output.os,
+        ];
+        let outputs = outputs
+            .iter()
+            .map(|name| {
+                Ok(name
+                    .as_ref()
+                    .ok_or("unknown")
+                    .map_err(|_| ShellError::NotFound { span })?
+                    .to_string())
+            })
+            .collect::<Result<Vec<String>, ShellError>>()?;
+        Ok(PipelineData::Value(
+            Value::record(
+                record! {
+                    "kernel-name" => Value::string(outputs[0].clone(), span),
+                    "nodename" => Value::string(outputs[1].clone(), span),
+                    "kernel-release" => Value::string(outputs[2].clone(), span),
+                    "kernel-version" => Value::string(outputs[3].clone(), span),
+                    "machine" => Value::string(outputs[4].clone(), span),
+                    "operating-system" => Value::string(outputs[5].clone(), span),
+                },
+                span,
+            ),
+            None,
+        ))
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![Example {
+            description: "Print all information",
+            example: "uname",
+            result: None,
+        }]
+    }
+}

crates/nu-command/tests/commands/mod.rs

@@ -111,7 +111,9 @@ mod try_;
 mod ucp;
 #[cfg(unix)]
 mod ulimit;
+
 mod umkdir;
+mod uname;
 mod uniq;
 mod uniq_by;
 mod update;

crates/nu-command/tests/commands/uname.rs

@@ -0,0 +1,12 @@
+use nu_test_support::nu;
+use nu_test_support::playground::Playground;
+#[test]
+fn test_uname_all() {
+    Playground::setup("uname_test_1", |dirs, _| {
+        let actual = nu!(
+            cwd: dirs.test(),
+            "uname"
+        );
+        assert!(actual.status.success())
+    })
+}