Attempts to add a command that checks if nushell is running with admin priveleges (#5712)

* attempts to add is-admin command

* fmt and clippy

* fmt

* Update is_admin.rs

* typos

* typo in example

crates/nu-command/src/default_context.rs

@@ -382,6 +382,7 @@ pub fn create_default_context(cwd: impl AsRef<Path>) -> EngineState {
         // Experimental
         bind_command! {
             ViewSource,
+            IsAdmin,
         };
 
         // Deprecated

crates/nu-command/src/experimental/is_admin.rs

@@ -0,0 +1,48 @@
+use is_root::is_root;
+use nu_protocol::ast::Call;
+use nu_protocol::engine::{Command, EngineState, Stack};
+use nu_protocol::{Category, Example, IntoPipelineData, PipelineData, Signature, Span, Value};
+
+#[derive(Clone)]
+pub struct IsAdmin;
+
+impl Command for IsAdmin {
+    fn name(&self) -> &str {
+        "is-admin"
+    }
+
+    fn usage(&self) -> &str {
+        "Check if nushell is running with administrator or root privileges"
+    }
+
+    fn signature(&self) -> nu_protocol::Signature {
+        Signature::build("is-admin").category(Category::Core)
+    }
+
+    fn run(
+        &self,
+        _engine_state: &EngineState,
+        _stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
+        Ok(Value::Bool {
+            val: is_root(),
+            span: call.head,
+        }
+        .into_pipeline_data())
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![
+            Example {
+                description: "Echo 'iamroot' if nushell is running with admin/root privileges, and 'iamnotroot' if not.",
+                example: r#"if is-admin { echo "iamroot" } else { echo "iamnotroot" }"#,
+                result: Some(Value::String {
+                    val: "iamnotroot".to_string(),
+                    span: Span::test_data(),
+                }),
+            },
+        ]
+    }
+}

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

@@ -1,3 +1,5 @@
+mod is_admin;
 mod view_source;
 
+pub use is_admin::IsAdmin;
 pub use view_source::ViewSource;