going to have to figure out how to clone input or some other solution

crates/nu-command/src/default_context.rs

@@ -43,6 +43,7 @@ pub fn create_default_context() -> EngineState {
             IntoBinary,
             IntoFilesize,
             IntoInt,
+            Last,
             Length,
             Let,
             LetEnv,

crates/nu-command/src/filters/last.rs

@@ -0,0 +1,78 @@
+use nu_engine::CallExt;
+
+use nu_protocol::ast::Call;
+use nu_protocol::engine::{Command, EngineState, Stack};
+use nu_protocol::{PipelineData, ShellError, Signature, SyntaxShape, Value};
+//use nu_protocol::{IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape, Value};
+
+#[derive(Clone)]
+pub struct Last;
+
+impl Command for Last {
+    fn name(&self) -> &str {
+        "last"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("last").optional(
+            "rows",
+            SyntaxShape::Int,
+            "starting from the back, the number of rows to return",
+        )
+    }
+
+    fn usage(&self) -> &str {
+        "Show only the last number of rows."
+    }
+
+    fn run(
+        &self,
+        engine_state: &EngineState,
+        stack: &mut Stack,
+        call: &Call,
+        input: PipelineData,
+    ) -> Result<PipelineData, ShellError> {
+        let rows: Option<i64> = call.opt(engine_state, stack, 0)?;
+
+        let vlength = length(input)?;
+        dbg!(vlength);
+
+        let end_rows_desired = if let Some(quantity) = rows {
+            quantity
+        } else {
+            1
+        };
+
+        let beginning_rows_to_skip = if end_rows_desired < vlength {
+            vlength - end_rows_desired
+        } else {
+            0
+        };
+
+        dbg!(beginning_rows_to_skip);
+
+        //  let iter = v.into_iter().skip(beginning_rows_to_skip);
+
+        //dbg!(input.clone());
+        /*
+                match input {
+                    PipelineData::Stream(stream) => Ok(stream.into_pipeline_data()),
+                    PipelineData::Value(Value::List { vals, .. }) => {
+                        Ok(vals.into_iter().into_pipeline_data())
+                    }
+                    _ => {
+                        dbg!("Fall to the bottom");
+                        Ok(PipelineData::Value(Value::Nothing { span: call.head }))
+                    }
+                }
+        */
+        Ok(PipelineData::Value(Value::Nothing { span: call.head }))
+    }
+}
+
+fn length(input: PipelineData) -> Result<i64, nu_protocol::ShellError> {
+    match input {
+        PipelineData::Value(Value::Nothing { .. }) => Ok(1),
+        _ => Ok(input.into_iter().count() as i64),
+    }
+}

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

@@ -1,5 +1,6 @@
 mod each;
 mod get;
+mod last;
 mod length;
 mod lines;
 mod par_each;
@@ -9,6 +10,7 @@ mod wrap;
 
 pub use each::Each;
 pub use get::Get;
+pub use last::Last;
 pub use length::Length;
 pub use lines::Lines;
 pub use par_each::ParEach;