From fc88a8538be65d12a514da3d0ed52c496b902ac7 Mon Sep 17 00:00:00 2001
From: JT <547158+jntrnr@users.noreply.github.com>
Date: Wed, 9 Feb 2022 13:41:41 -0500
Subject: [PATCH] Make `let-env` work like `let` (#4389)

* Make let-env work like let

* Fix tests
---
 crates/nu-command/src/env/let_env.rs      | 2 +-
 src/tests/test_engine.rs                  | 6 +++---
 src/tests/test_parser.rs                  | 8 ++++++++
 tests/shell/pipeline/commands/internal.rs | 4 ++--
 4 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/crates/nu-command/src/env/let_env.rs b/crates/nu-command/src/env/let_env.rs
index 4035959cca..a11ae0cc43 100644
--- a/crates/nu-command/src/env/let_env.rs
+++ b/crates/nu-command/src/env/let_env.rs
@@ -20,7 +20,7 @@ impl Command for LetEnv {
             .required("var_name", SyntaxShape::String, "variable name")
             .required(
                 "initial_value",
-                SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::Any)),
+                SyntaxShape::Keyword(b"=".to_vec(), Box::new(SyntaxShape::Expression)),
                 "equals sign followed by value",
             )
             .category(Category::Env)
diff --git a/src/tests/test_engine.rs b/src/tests/test_engine.rs
index bf71616112..a3fec1c106 100644
--- a/src/tests/test_engine.rs
+++ b/src/tests/test_engine.rs
@@ -194,7 +194,7 @@ fn let_sees_in_variable2() -> TestResult {
 #[test]
 fn def_env() -> TestResult {
     run_test(
-        r#"def-env bob [] { let-env BAR = BAZ }; bob; $env.BAR"#,
+        r#"def-env bob [] { let-env BAR = "BAZ" }; bob; $env.BAR"#,
         "BAZ",
     )
 }
@@ -202,7 +202,7 @@ fn def_env() -> TestResult {
 #[test]
 fn not_def_env() -> TestResult {
     fail_test(
-        r#"def bob [] { let-env BAR = BAZ }; bob; $env.BAR"#,
+        r#"def bob [] { let-env BAR = "BAZ" }; bob; $env.BAR"#,
         "did you mean",
     )
 }
@@ -226,7 +226,7 @@ fn def_env_then_hide() -> TestResult {
 #[test]
 fn export_def_env() -> TestResult {
     run_test(
-        r#"module foo { export def-env bob [] { let-env BAR = BAZ } }; use foo bob; bob; $env.BAR"#,
+        r#"module foo { export def-env bob [] { let-env BAR = "BAZ" } }; use foo bob; bob; $env.BAR"#,
         "BAZ",
     )
 }
diff --git a/src/tests/test_parser.rs b/src/tests/test_parser.rs
index e3c72f7116..d744e328ed 100644
--- a/src/tests/test_parser.rs
+++ b/src/tests/test_parser.rs
@@ -189,3 +189,11 @@ fn commands_have_usage() -> TestResult {
 fn equals_separates_long_flag() -> TestResult {
     run_test(r#"seq 1 4 --separator='+'"#, "1+2+3+4")
 }
+
+#[test]
+fn let_env_expressions() -> TestResult {
+    run_test(
+        r#"let-env PATH = if (env | any? name == VENV_OLD_PATH) { $env.VENV_OLD_PATH } else { $env.PATH }; echo done"#,
+        "done",
+    )
+}
diff --git a/tests/shell/pipeline/commands/internal.rs b/tests/shell/pipeline/commands/internal.rs
index b602aae0fa..51191b56c0 100644
--- a/tests/shell/pipeline/commands/internal.rs
+++ b/tests/shell/pipeline/commands/internal.rs
@@ -464,7 +464,7 @@ fn proper_shadow_let_env_aliases() {
     let actual = nu!(
         cwd: ".",
         r#"
-        let-env DEBUG = true; echo $env.DEBUG | table; do { let-env DEBUG = false; echo $env.DEBUG } | table; echo $env.DEBUG
+        let-env DEBUG = "true"; echo $env.DEBUG | table; do { let-env DEBUG = "false"; echo $env.DEBUG } | table; echo $env.DEBUG
         "#
     );
     assert_eq!(actual.out, "truefalsetrue");
@@ -513,7 +513,7 @@ fn proper_shadow_load_env_aliases() {
     let actual = nu!(
         cwd: ".",
         r#"
-        let-env DEBUG = true; echo $env.DEBUG | table; do { echo {DEBUG: "false"} | load-env; echo $env.DEBUG } | table; echo $env.DEBUG
+        let-env DEBUG = "true"; echo $env.DEBUG | table; do { echo {DEBUG: "false"} | load-env; echo $env.DEBUG } | table; echo $env.DEBUG
         "#
     );
     assert_eq!(actual.out, "truefalsetrue");