Support multiple shorthand env vars (#3692)

crates/nu-parser/src/parse.rs

@@ -2099,18 +2099,33 @@ pub fn classify_block(
     for group in &lite_block.block {
         let mut out_group = Group::basic();
         for pipeline in &group.pipelines {
-            let (pipeline, vars, err) = expand_shorthand_forms(pipeline);
+            let mut env_vars = vec![];
+            let mut pipeline = pipeline.clone();
+            loop {
+                if pipeline.commands.is_empty() || pipeline.commands[0].parts.is_empty() {
+                    break;
+                }
+                let (pl, vars, err) = expand_shorthand_forms(&pipeline);
                 if error.is_none() {
                     error = err;
                 }
 
-            let (out_pipe, err) = parse_pipeline(pipeline.clone(), scope);
+                pipeline = pl;
+                if let Some(vars) = vars {
+                    env_vars.push(vars);
+                } else {
+                    break;
+                }
+            }
+
+            let pipeline_span = pipeline.span();
+            let (mut out_pipe, err) = parse_pipeline(pipeline, scope);
             if error.is_none() {
                 error = err;
             }
 
-            let pipeline = if let Some(vars) = vars {
+            while let Some(vars) = env_vars.pop() {
-                let span = pipeline.span();
+                let span = pipeline_span;
                 let block = hir::Block::new(
                     Signature::new("<block>"),
                     vec![Group::new(vec![out_pipe.clone()], span)],
@@ -2149,16 +2164,14 @@ pub fn classify_block(
                     args: call,
                 });
 
-                Pipeline {
+                out_pipe = Pipeline {
                     list: vec![classified_with_env],
                     span,
-                }
-            } else {
-                out_pipe
                 };
+            }
 
-            if !pipeline.list.is_empty() {
+            if !out_pipe.list.is_empty() {
-                out_group.push(pipeline);
+                out_group.push(out_pipe);
             }
         }
         if !out_group.pipelines.is_empty() {

tests/shell/environment/env.rs

@@ -6,6 +6,22 @@ use nu_test_support::playground::Playground;
 
 use serial_test::serial;
 
+#[test]
+fn env_shorthand() {
+    let actual = nu!(cwd: ".", r#"
+        FOO=bar echo $nu.env.FOO
+        "#);
+    assert_eq!(actual.out, "bar");
+}
+
+#[test]
+fn env_shorthand_multi() {
+    let actual = nu!(cwd: ".", r#"
+        FOO=bar BAR=baz $nu.env.FOO + $nu.env.BAR
+    "#);
+    assert_eq!(actual.out, "barbaz");
+}
+
 #[test]
 fn passes_let_env_env_var_to_external_process() {
     let actual = nu!(cwd: ".", r#"