Add a very silly ls

Cargo.lock

@@ -164,6 +164,12 @@ dependencies = [
  "wasi",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
+
 [[package]]
 name = "instant"
 version = "0.1.10"
@@ -276,6 +282,7 @@ dependencies = [
 name = "nu-command"
 version = "0.1.0"
 dependencies = [
+ "glob",
  "nu-engine",
  "nu-protocol",
 ]

crates/nu-command/Cargo.toml

@@ -7,4 +7,7 @@ edition = "2018"
 
 [dependencies]
 nu-protocol = { path = "../nu-protocol" }
-nu-engine = { path = "../nu-engine" }
+nu-engine = { path = "../nu-engine" }
+
+# Potential dependencies for extras
+glob = "0.3.0"

crates/nu-command/src/default_context.rs

@@ -6,7 +6,7 @@ use nu_protocol::{
 };
 
 use crate::{
-    where_::Where, Alias, Benchmark, BuildString, Def, Do, Each, For, If, Length, Let, LetEnv,
+    where_::Where, Alias, Benchmark, BuildString, Def, Do, Each, For, If, Length, Let, LetEnv, Ls,
 };
 
 pub fn create_default_context() -> Rc<RefCell<EngineState>> {
@@ -43,6 +43,8 @@ pub fn create_default_context() -> Rc<RefCell<EngineState>> {
 
         working_set.add_decl(Box::new(Length));
 
+        working_set.add_decl(Box::new(Ls));
+
         let sig = Signature::build("exit");
         working_set.add_decl(sig.predeclare());
         let sig = Signature::build("vars");

crates/nu-command/src/lib.rs

@@ -10,6 +10,7 @@ mod if_;
 mod length;
 mod let_;
 mod let_env;
+mod ls;
 mod where_;
 
 pub use alias::Alias;
@@ -24,3 +25,4 @@ pub use if_::If;
 pub use length::Length;
 pub use let_::Let;
 pub use let_env::LetEnv;
+pub use ls::Ls;

crates/nu-protocol/src/value/mod.rs

@@ -278,6 +278,13 @@ impl Value {
         Ok(current)
     }
 
+    pub fn string(s: &str, span: Span) -> Value {
+        Value::String {
+            val: s.into(),
+            span,
+        }
+    }
+
     pub fn is_true(&self) -> bool {
         matches!(self, Value::Bool { val: true, .. })
     }