It-expansion fixes (#1757)

* It-expansion fixes

* fix clippy

crates/nu-cli/src/commands/classified/expr.rs

@@ -3,6 +3,7 @@ use crate::prelude::*;
 
 use log::{log_enabled, trace};
 
+use futures::stream::once;
 use nu_errors::ShellError;
 use nu_protocol::hir::SpannedExpression;
 use nu_protocol::Scope;
@@ -10,7 +11,7 @@ use nu_protocol::Scope;
 pub(crate) fn run_expression_block(
     expr: SpannedExpression,
     context: &mut Context,
-    input: InputStream,
+    _input: InputStream,
     scope: &Scope,
 ) -> Result<InputStream, ShellError> {
     if log_enabled!(log::Level::Trace) {
@@ -20,10 +21,7 @@ pub(crate) fn run_expression_block(
 
     let scope = scope.clone();
     let registry = context.registry().clone();
-    let stream = input.map(move |row| {
+    let output = evaluate_baseline_expr(&expr, &registry, &scope)?;
-        let scope = scope.clone().set_it(row);
-        evaluate_baseline_expr(&expr, &registry, &scope)
-    });
 
-    Ok(stream.to_input_stream())
+    Ok(once(async { Ok(output) }).to_input_stream())
 }

crates/nu-cli/src/commands/date.rs

@@ -33,6 +33,19 @@ impl WholeStreamCommand for Date {
     ) -> Result<OutputStream, ShellError> {
         date(args, registry)
     }
+
+    fn examples(&self) -> &[Example] {
+        &[
+            Example {
+                description: "Get the current local time and date",
+                example: "date",
+            },
+            Example {
+                description: "Get the current UTC time and date",
+                example: "date --utc",
+            },
+        ]
+    }
 }
 
 pub fn date_to_value<T: TimeZone>(dt: DateTime<T>, tag: Tag) -> Value

crates/nu-cli/tests/commands/cal.rs

@@ -51,3 +51,15 @@ fn cal_rows_in_2020() {
 
     assert!(actual.out.contains("62"));
 }
+
+#[test]
+fn cal_sees_pipeline_year() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo 1020 | cal --full-year $it | get monday | first 3 | to json
+        "#
+    ));
+
+    assert_eq!(actual.out, "[3,10,17]");
+}

crates/nu-cli/tests/commands/math.rs

@@ -108,6 +108,18 @@ fn duration_math() {
     assert_eq!(actual.out, "8:00:00:00");
 }
 
+#[test]
+fn it_math() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            echo 1020 | = $it + 10
+        "#
+    ));
+
+    assert_eq!(actual.out, "1030");
+}
+
 #[test]
 fn compound_comparison() {
     let actual = nu!(

crates/nu-protocol/src/hir.rs

@@ -92,6 +92,14 @@ impl ClassifiedCommand {
                     }
                 }
 
+                if let Some(named) = &command.args.named {
+                    for arg in named.iter() {
+                        if let NamedValue::Value(_, value) = arg.1 {
+                            result = result || value.has_shallow_it_usage();
+                        }
+                    }
+                }
+
                 result
             }
             ClassifiedCommand::Expr(expr) => expr.has_shallow_it_usage(),